S-8337/8338 Series
www.ablicinc.com
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL
SWITCHING REGULATOR CONTROLLER
© ABLIC Inc., 2003-2010 Rev.4.0_02
1
The S-8337/8338 Series is a CMOS step-up switching regulator which mainly consists of a reference voltage
circuit, an oscillator, an error amplifier, a PWM controller, an under voltage lockout circuit (UVLO), and a timer
latch short-circuit protection circuit. Because its minimum operating voltage is as low as 1.8 V, this switching
regulator is ideal for the power supply of an LCD or for portable systems that operate on a low voltage. The
internal oscillation frequency can be set up to 1.133 MHz, via the resistor connected to the ROSC pin.
With the S-8337 Series, the maximum duty ratio of PWM control can be controlled by the resistor connected to
the RDuty pin. With the S-8338 Series, the maximum duty ratio is fixed (to 88%). The phase compensation
and gain value can be adjusted according to the values of the resistor and capacitor connected to the CC pin.
Therefore, the operation stability and transient response can be correctly set for each application. The
reference voltage accuracy is as high as 1.0 V1.5%, and any voltage can be output by using an external
output voltage setting resistor.
In addition, the delay time of the short-circuit protection circuit can be set by using the capacitor connected to
the CSP pin. If the maximum duty condition continues because of short-circuiting, the capacitor externally
connected to the CSP pin is charged, and oscillation stops after a specific time. This condition is cleared by
re-application of power or by setting the switching regulator (S-8338 Series) to the shutdown status. A ceramic
capacitor or a tantalum capacitor is used as the output capacitor, depending on the setting. This controller IC
allows various settings and selections and employs a small package, making it very easy to use.
Features
Low voltage operation: 1.8 V to 6.0 V
Oscillation frequency: 286 kHz to 1.133 MHz (selectable by external resistor)
Maximum duty: 47 to 88.5% (selectable by external resistor) (S-8337 Series)
Fixed to 88% typ. (S-8338 Series)
Reference voltage: 1.0 V1.5%
UVLO (under-voltage lockout) function:
Detection voltage can be selected from between 1.5 V and 2.3 V in 0.1 V steps.
Hysteresis width can be selected from between 0.1 V and 0.3 V in 0.1 V steps.
Timer latch short-circuit protection circuit:
Delay time can be set using an external capacitor.
Soft-start function: Soft-start time can be selected in three steps, 10 ms, 15 ms, and 20 ms.
Phase compensation external setting:
Adjustable by connecting resistor and capacitor in series to GND.
Shutdown function: S-8338 Series, shutdown current consumption: 1.0
A max.
Lead-free, Sn 100%, halogen-free*1
*1. Refer to “ Product Name Structure” for details.
Applications
Power supplies for LCDs and CCDs
Power supplies for portable equipment
Packages
8-Pin SON(A)
8-Pin TSSOP
www.ablic.com
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
2
Block Diagram
PWM
comparator
V
OUT
Timer latch
short-circuit
protection circuit
RDuty (S-8337) or
ON/OFF (S-8338)
RFB2
VSS
RFB1
FB
SD
L
VIN
EXT
UVLO
CSP CC
RZ CZ
ROSC
M1
CFB
Oscillator
Maximum duty circuit
Reference voltage
(1.0 V) soft-start
circuit
Error amplifier
C
IN
C
L
Figure 1 Block Diagram
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
3
Product Name Structure
1. Product name
(1) 8-Pin SON(A)
S-833 x A x x x - P8T1 G
Environmental code
G: Lead-free (for details, please contact our sales office)
Package name (abbreviation) and packing specification
P8T1: 8-Pin SON(A), tape
Soft-start time setting
A: 10 ms
B: 15 ms
C: 20 ms
UVLO setting
A: 2.3 V
B: 2.2 V
C: 2.1 V
D: 2.0 V
E: 1.9 V
F: 1.8 V
G: 1.7 V
H: 1.6 V
I: 1.5 V
UVLO hysteresis setting
A: 0.1 V
B: 0.2 V
C: 0.3 V
Pin setting
7: With MaxDuty setting function
8: With Shutdown function
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
4
(2) 8-Pin TSSOP
S-833 x A x x x - T8T1 x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales office)
Package name (abbreviation) and packing specification
T8T1: 8-Pin TSSOP, tape
Soft-start time setting
A: 10 ms
B: 15 ms
C: 20 ms
UVLO setting
A: 2.3 V
B: 2.2 V
C: 2.1 V
D: 2.0 V
E: 1.9 V
F: 1.8 V
G: 1.7 V
H: 1.6 V
I: 1.5 V
UVLO hysteresis setting
A: 0.1 V
B: 0.2 V
C: 0.3 V
Pin setting
7: With MaxDuty setting function
8: With Shutdown function
2. Packages
Package Name Drawing Code
Package Tape Reel
8-Pin SON(A) PN008-A-P-SD PN008-A-C-SD PN008-A-R-SD
8-Pin TSSOP Environmental code = G FT008-A-P-SD FT008-E-C-SD FT008-E-R-SD
Environmental code = U FT008-A-P-SD FT008-E-C-SD FT008-E-R-S1
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
5
Pin Configurations
Table 1
8-Pin SON(A)
Top view
1
3
2
4
8
6
7
5
Pin No. Symbol Description
1 CC
Error amplifier circuit output phase
compensation pin
2 FB Output voltage feedback pin
3 CSP
Short-circuit protection delay time
setting pin
4 VIN Power supply input pin
5 EXT External transistor connection pin
6 VSS GND pin
7 ROSC
Oscillation frequency setting resistor
connection pin
Figure 2
8 RDuty Maximum duty setting resistor
connection pin (S-8337 Series)
OFFON/ Shutdown pin (S-8338 Series)
Table 2
8-Pin TSSOP
Top view
1
3
2
4
8
6
7
5
Pin No. Symbol Description
1 CC
Error amplifier circuit output phase
compensation pin
2 FB Output voltage feedback pin
3 CSP
Short-circuit protection delay time
setting pin
4 VIN Power supply input pin
5 EXT External transistor connection pin
6 VSS GND pin
7 ROSC
Oscillation frequency setting resistor
connection pin
Figure 3
8 RDuty Maximum duty setting resistor
connection pin (S-8337 Series)
OFFON/ Shutdown pin (S-8338 Series)
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
6
Absolute Maximum Ratings
Table 3 Absolute Maximum Ratings
(Unless otherwise specified: Ta 25C, VSS 0 V)
Parameter Symbol Absolute Maximum Rating Unit
VIN pin voltage VIN VSS – 0.3 to VSS
6.5 V
FB pin voltage VFB VSS – 0.3 to VSS
6.5 V
EXT pin voltage VEXT VSS – 0.3 to VIN
0.3 V
CSP pin voltage VCSP VSS – 0.3 to VIN
0.3 V
CC pin voltage VCC VSS – 0.3 to VIN
0.3 V
CC pin current ICC
10 mA
ROSC pin voltage VROSC VSS – 0.3 to VIN
0.3 V
ROSC pin current IROSC
10 mA
RDuty pin voltage VRDut
y
VSS – 0.3 to VIN
0.3 V
RDuty pin current IRDut
y
10 mA
ON/OFF pin voltage VON/OFF VSS – 0.3 to VSS
6.5 V
Power
dissipation
8-Pin SON(A)
PD
300 (When not mounted on board) mW
600*1 mW
8-Pin TSSOP 300 (When not mounted on board) mW
700*1 mW
Operating ambient temperature To
p
r –40 to
85 C
Storage temperature Tst
g
–40 to
125 C
*1. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm 76.2 mm t1.6 mm
(2) Board name : JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product
could suffer physical damage. These values must therefore not be exceeded
under any conditions.
(1) When mounted on board (2) When not mounted on board
050 100 150
600
400
200
0
Power Dissipation P
D
(mW)
Ambient Temperature Ta (C)
500
300
100
700
800
8-Pin SON(A)
8-Pin TSSOP
050 100 150
300
200
100
0
Power Dissipation P
D
(mW)
Ambient Temperature Ta (C)
400
8-Pin SON(A)
8-Pin TSSOP
Figure 4 Power Dissipation of Package
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
7
Electrical Characteristics
1. S-8337 Series
Table 4 Electrical Characteristics
(Unless otherwise specified: VIN 3.3 V, Ta 25C)
Parameter Symbol Conditions Min. Typ. Max. Unit
Test
Circuit
Operating input voltage VIN 1.8 6.0 V 2
FB voltage VFB 0.985 1.000 1.015 V 2
Current consumption ISS1 fosc 700 kHz
VFB 0.95 V 400 700 A 1
EXT pin output current IEXTH V
EXT VIN 0.4 V 100 60 mA 1
IEXTL V
EXT 0.4 V 100 160 mA 1
FB voltage temperature
coefficient
VFB
Ta Ta 40C to 85C 100 ppm/C2
FB pin input current IFB 0.1 0.1 A 1
Oscillation frequency*1 fosc
fosc 1133 kHz (ROSC 120 k)
fosc 700 kHz (ROSC 200 k)
fosc 286 kHz (ROSC 510 k)
VFB 0.9 V
Waveform on EXT pin is measured.
fosc
0.9 fosc fosc
1.1 kHz 1
Oscillation frequency
temperature coefficient
fosc
Ta
Ta 40C to 85C
fosc 700 kHz 1000 ppm/C1
Max. duty*2 MaxDuty
fosc 700 kHz (ROSC 200 k)
MaxDuty 88.5% (RDuty 100 k)
MaxDuty 77% (RDuty 300 k)
MaxDuty 47% (RDut
y
820 k)
MaxDuty
5 MaxDuty MaxDuty
5 % 1
Soft-start time tSS tSS 10 ms, 15 ms, 20 ms
Selected in three steps
tSS
0.75 tSS tSS
1.5 ms 1
Short-circuit protection
delay time*3 tPRO tPRO 50 ms
(CSP 0.1 F) 37.5 50 75 ms 1
UVLO detection voltage VUVLO VUVLO 1.5 V to 2.3 V
Selected in 0.1 V steps
VUVLO
0.95 VUVLO
VUVLO
1.05 V 1
UVLO hysteresis width VUVLOHYS VUVLOHYS 0.1 V to 0.3 V
Selected in 0.1 V steps
VUVLOHYS
0.6 VUVLOHYS VUVLOHYS
1.4 mV 1
CC pin output current ICCH V
FB 2 V 75 50 37.5 A 1
ICCL V
FB 0 V 37.5 50 75 A 1
Timer latch reset voltage VRTLT 0.7 1.0 1.3 V 1
*1. The recommended range of the resistance (Rosc) for setting the oscillation frequency is Rosc 120 k to 510 k (fOSC 286 kHz to
1.133 MHz). However, the oscillation frequency is in the range of typical values when an ideal resistor is externally connected, so
actually the fluctuation of the IC (10%) must be considered.
*2. The recommended range of the resistance (RDuty/Rosc) for setting the maximum duty is RDuty/Rosc 0.5 to 4.1 (MaxDuty 47 to 88.5%).
However, the maximum duty is in the range of typical values when an ideal resistor is externally connected, so actually the fluctuation
of the IC (5%) must be considered.
*3. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited
when an ideal case is assumed. But, use CSP approximately 0.47 F as a target maximum value due to the need to consider the
discharge time of the capacitor.
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
8
2. S-8338 Series
Table 5 Electrical Characteristics
(Unless otherwise specified: VIN 3.3 V, Ta 25C)
Parameter Symbol Conditions Min. Typ. Max. Unit
Test
Circuit
Operating input voltage VIN 1.8 6.0 V 2
FB voltage VFB 0.985 1.000 1.015 V 2
Current consumption ISS1 fosc 700 kHz
VFB 0.95 V 400 700 A 1
Shutdown current
consumption ISSS V
IN 6.0 V 1.0 A 1
EXT pin output current IEXTH V
EXT VIN 0.4 V 100 60 mA 1
IEXTL V
EXT 0.4 V 100 160 mA 1
FB voltage temperature
coefficient
VFB
Ta Ta 40C to 85C 100 ppm/C2
FB pin input current IFB 0.1 0.1 A 1
Oscillation frequency*1 fosc
fosc 1133 kHz (ROSC 120 k)
fosc 700 kHz (ROSC 200 k)
fosc 286 kHz (ROSC 510 k)
VFB 0.9 V
Waveform on EXT pin is measured
fosc
0.9 fosc fosc
1.1 kHz 1
Oscillation frequency
temperature coefficient
fosc
Ta
Ta 40C to 85C
fosc 700 kHz 1000 ppm/C1
Max. duty ratio MaxDuty fosc 700 kHz (ROSC 200 k) 83 88 93 % 1
Soft-start time tSS tSS 10 ms, 15 ms, 20 ms
Selectable in three steps
tSS
0.75 tSS tSS
1. 5 ms 1
Short-circuit protection
delay time*2 tPRO tPRO 50 ms
(CSP 0.1 F) 37.5 50 75 ms 1
UVLO detection voltage VUVLO VUVLO 1.5 V to 2.3 V
Selected in 0.1 V steps
VUVLO
0.95 VUVLO
VUVLO
1.05 V 1
UVLO hysteresis width VUVLOHYS VUVLOHYS 0.1 V to 0.3 V
Selected in 0.1 V steps
VUVLOHYS
0.6 VUVLOHYS VUVLOHYS
1.4 mV 1
CC pin output current ICCH V
FB 2 V 75 50 37.5 A 1
ICCL V
FB 0 V 37.5 50 75 A 1
Timer latch reset
voltage VRTLT 0.7 1.0 1.3 V 1
Shutdown pin input
voltage (High level) VSH 1.8 V 1
Shutdown pin input
voltage (Low level) VSL 0.3 V 1
Shutdown pin input
current (High level) ISH 0.1 0.1 A 1
Shutdown pin input
current (Low level) ISL 0.1 0.1 A 1
*1. The recommended range of the resistance (Rosc) for setting the oscillation frequency is Rosc 120 k to 510 k (fosc 286 kHz to 1.133
MHz). However, the oscillation frequency is in the range of typical values when an ideal resistor is externally connected, so actually
the fluctuation of the IC (10%) must be considered.
*2. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited
when an ideal case is assumed. But, use CSP approximately 0.47 F as a target maximum value due to the need to consider the
discharge time of the capacitor.
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
9
External Parts When Measuring Electrical Characteristics
Table 6 External Parts
Element Name Symbol Manufacturer Part Number
Inductor L TDK Corporation
LDR655312T 4.7
H
Diode SD Rohm Co., Ltd. RB491D
Output capacitor CL Ceramic 10
F
Transistor M1
Sanyo Electric Co., Ltd.
MCH3406
Oscillation frequency setting resistor
ROSC 200 k
(when fOSC 700 kHz)
Maximum duty ratio setting resistor
RDuty
300 k
(when MaxDuty
77%)
Short-circuit protection delay time
setting capacitor
CSP 0.1
F (when tPRO 50 ms)
Output voltage setting resistor 1 RFB1 8.2 k
(when VOUT 9.2 V)
Output voltage setting resistor 2 RFB2 1.0 k
(when VOUT 9.2 V)
FB pin capacitor CFB 180 pF
Phase compensation resistor RZ 200 k
Phase compensation capacitor CZ 0.01
F
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
10
Measurement Circuits
1. CC
EXT
VSS
FB
CSP
ROSC
VIN
A
RDuty
(ON/OFF)
CINCSP CZ
RZ
ROSC RDuty
Oscilloscope
Figure 5
2. CC
EXT
VSS
FB
CSP
ROSC
VIN
V
RDuty
(ON/OFF)
CSP
CIN
M1
CL
RFB2
RFB1 CFB
RZ
CZ
L
SD ROSC RDuty
Figure 6
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
11
Operation
1. Switching control method
PWM control (S-8337/8338 Series)
The S-8337/8338 Series is a DC-DC converter using a pulse width modulation method (PWM).
The pulse width of the S-8337/8338 Series varies from 0% to the maximum duty set by RDuty
depending on the load current (the pulse width of the S-8338 Series is fixed to 88%), but its switching
frequency does not change. Consequently, the ripple voltage generated from switching can be
removed easily via a filter.
2. Soft-start function
For this IC, the built-in soft-start circuit controls the rush current and overshoot of the output voltage
when powering on or when the OFFON/ pin is switched to the “H” level. A reference voltage
adjustment method is adopted as the soft-start method. The following describes the soft-start
function.
The raising of the output voltage is controlled by slowly raising the reference voltage of the error
amplifier input from 0 V at power on as shown in Figure 7. The soft-start function is realized by
controlling the voltage of the FB pin so that it is the same potential as the reference voltage that is
slowly raised. A Rail-to-Rail amplifier is adopted as the error amplifier, which means that the voltage
is loop controlled so that it can be the same as the reference voltage.
The following explains the operation at power on (refer to Figure 8).
When VIN is raised from 0 V to 3.3 V, the VOUT voltage rises to a value close to VIN via the inductor L
and diode SD. This raises the voltage of the FB pin (VFB) by approximately 0.35 V (when RFB1 8.2
k, RFB2 1.0 k). Because the reference voltage rises from 0 V, the VFB voltage is higher than the
reference voltage while the voltage rises from 0 V to 0.35 V. During this period, the EXT output is low.
The EXT output is in the stepped-up status between high and low after the reference voltage reaches
0.35 V and VOUT is slowly raised in accordance with the rising of the reference voltage.
Once the reference voltage rises, the voltage cannot be reset (the reference voltage is 0 V) unless the
power supply voltage is the UVLO detection voltage or lower or the shutdown pin is the “L” level.
Conversely, when the power supply voltage rises up to the reset voltage after it is lowered to the
UVLO detection voltage or lower, the output voltage is stepped up by the soft-start function.
PWM
Comparator
VOUT
RFB2
RFB1
FB
SD
L
V
IN
EXT
CC
RZ
CZ
M1 +
–CL
Error amplifier
Vref
0.5 V
0 V
+
–Error amplifier
reference voltage
Figure 7
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
12
(VIN 0 V3.3 V, VOUT 9.2 V, RFB1 8.2 k, RFB2 1.0 k)
0.3 V
0 V
In put vo ltage
(V
IN
)
3.3 V
0 V
Output voltage
(V
OUT
)
9.2 V
0 V
Err or amp lifier
reference voltage
1.0 V
0 V
FB pin vol tage
(V
FB
)
1.0 V
0 V
EXT pin voltage
(V
EX T
)
4.0 V
t
(
ms
)
0.35 V
2.9 V
tSS
VOUT 0.95 V
Figure 8
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
13
3. Shutdown pin (S-8338 Series only)
This pin stops or starts step-up operations.
Switching the shutdown pin to the “L” level stops operation of all the internal circuits and reduces the
current consumption significantly.
DO NOT use the shutdown pin in a floating state because it is not pulled up or pulled down internally.
DO NOT apply voltage of between 0.3 V and 1.8 V to the shutdown pin because applying such a
voltage increases the current consumption. If the shutdown pin is not used, connect it to the VIN pin.
Table 7
Shutdown Pin CR Oscillator Output Voltage
“H” Operates Fixed
“L” Stopped
VIN
*1
*
1. Voltage of VIN from which the voltage drop from the
DC resistance of the inductor and the forward
voltage of the diode are subtracted
ON/OFF
VIN
VSS
Figure 9
4. Timer latch short-circuit protection function
This IC has a timer latch short-circuit protection circuit that stops the switching operation when the
output voltage drops for a specific time due to output short-circuiting. A capacitor (CSP) that is used
to set the delay time of this short-circuit protection circuit is connected to the CSP pin.
This IC operates at the maximum duty ratio if the output voltage drops due to output short-circuiting.
At the maximum duty ratio, constant-current charging of CSP starts. If this status lasts for a specific
time and the CSP pin voltage rises above the reference voltage (1 V), the latch mode is set. Note that
the latch mode is different from the shutdown status in that the switching operation is stopped but the
internal circuitry operates normally.
To reset the latch operation to protect the IC from short-circuiting, either lower VIN to the timer latch
reset voltage or lower or lower the level of the shutdown pin to “L”. Note that the latch operation is not
reset even if VIN falls below the UVLO voltage.
5. UVLO function
This IC includes a UVLO (under-voltage lockout) circuit to prevent the IC from malfunctioning due to a
transient status when power is applied or a momentary drop of the supply voltage. When UVLO is in
the detection state, switching is stopped and the external FET is held in the off status. Once UVLO
enters the detection state, the soft-start function is reset.
Note that the other internal circuits operate normally and that the status is different from the power-off
status.
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
14
6. Error amplifier
The error amplifier outputs the PWM control signal so that the voltage of the FB pin is held at a specific
value (1 V). By connecting a resistor (RZ) and capacitor (CZ) to the output pin (CC pin) of the error
amplifier in series, an optional loop gain can be set, enabling stabilized phase compensation.
7. Operation
The following are basic equations [(1) through (7)] of the step-up switching regulator (refer to
Figure 10).
D
L
C
L
M1 FB
CONT
V
IN
EXT
VSS
V
OUT
Figure 10 Step-up Switching Regulator Circuit for Basic Equations
Voltage at the CONT pin at the moment M1 is turned ON (current IL flowing through L is zero), VA:
VA VS
*1……………………………………………………………………………………………….…(1)
*1. VS: Non-saturated voltage of M1
Change in IL over time:
L
VV
L
V
dt
dl SINLL
…………………………………………………………………………………..…(2)
Integration of the above equation:
t
L
VV
ISIN
L
…………………………………………………………………….…………….……(3)
IL flows while M1 is ON (ton). This time is determined by the oscillation frequency of OSC.
Peak current (IPK) after tON:
ON
SIN
PK t
L
VV
I
……………………………………………………………………………………(4)
The energy stored in L is represented by L(IPK)2.
When M1 is turned OFF (tOFF), the energy stored in L is released via a diode, generating a reverse
voltage (VL).
VL:
INDOUTL VVVV *2
……….………………………………………………………..………………(5)
*2. VD: Diode forward voltage
The voltage on the CONT pin rises only by VOUT VD.
1
2
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
15
Change in current (IL) flowing through the diode into VOUT during tOFF:
L
VVV
L
V
dt
dl INDOUTLL
…………………………………………………………..…………………(6)
Integration of the above equation is as follows:
t
L
VVV
II INDOUT
PKL
…………………………………………………………………………(7)
During tON, energy is stored in L and is not transmitted to VOUT. When receiving output current (IOUT)
from VOUT, the energy of the capacitor (CL) is used. As a result, the pin voltage of CL is reduced, and
goes to the lowest level after M1 is turned ON (tON). When M1 is turned OFF, the energy stored in L is
transmitted via the diode to CL, and the pin voltage of CL rises drastically. Because VOUT is a time
function indicating the maximum value (ripple voltage: Vp-p) when the current flowing through the
diode into VOUT and the load current IOUT match.
Next, this ripple voltage is determined as follows.
IOUT vs t1 (time) from when M1 is turned OFF (after tON) to when VOUT reaches the maximum level:
1
INDOUT
PKOUT t
L
VVV
II
………………………………………………….………………...…(8)
INDOUT
OUTPK1 VVV
L
IIt
……………………………………………………………...…...(9)
When M1 is turned ON (after tOFF), IL = 0 (when the energy of the inductor is completely transmitted):
Based on equation (7),
PK
OFF
INDOUT I
t
VVV
L
…………………………………………………………………..………….(10)
When substituting equation (10) for equation (9):
OFF
PK
OUT
OFF1 t
I
I
tt
…………………………………………………………………………………(11)
Electrical charge Q1 which is charged in CL during t1:
2
1
INDOUT
1PK
1t
0
INDOUT
1t
0
PKL
1t
0
1t
2
1
L
VVV
tItdt
L
VVV
dtIdtIQ
……….…...(12)
When substituting equation (12) for equation (9):
1
OUTPK
1OUTPKPK1 t
2
II
tII
2
1
IQ
…………………………………………………….…….(13)
A rise voltage (Vp-p) due to Q1:
1
OUTPK
LL
1
pp t
2
II
C
1
C
Q
V
…………………………………………………………..……………(14)
When taking into consideration IOUT consumed during t1 and ESR*1 (RESR) of CL:
L
1OUT
ESR
OUTPK
1
OUTPK
LL
1
pp C
tI
R
2
II
t
2
II
C
1
C
Q
V
…………….………………….(15)
*1. Equivalent Series Resistance
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
16
When substituting equation (11) for equation (15):
ESR
OUTPK
L
OFF
PK
2
OUTPK
pp R
2
II
C
t
I2
II
V
…………………………………………………..…(16)
Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin
has a large capacity and a small ESR.
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
17
External Parts Selection
1. Inductor
The inductance has a strong influence on the maximum output current (IOUT) and efficiency ().
The peak current (IPK) increases by decreasing L and the stability of the circuit improves and IOUT
increases. If L is decreased further, the efficiency falls, and IOUT decreases if the current drive
capability of the external transistor is insufficient.
The loss of IPK by the switching transistor decreases by increasing L and the efficiency becomes
maximum at a certain L value. Further increasing L decrease the efficiency due to the loss of the DC
resistance of the inductor. IOUT also decreases.
If the oscillation frequency is higher, a smaller L value can be chosen, making the inductor smaller. In
the S-8337/8338 Series, the oscillation frequency can be varied within the range of 286 kHz to 1.133
MHz by the external resistor, so select an L value best suited to the frequency. The recommended
value is between 2.2 H and 22 H.
When selecting an inductor, note the allowable current of the inductor. If a current exceeding this
allowable current flows through the inductor, magnetic saturation occurs, substantially lowering the
efficiency and increasing the current, which results in damage to the IC.
Therefore, select an inductor so that IPK does not exceed the allowable current. IPK is expressed by
the following equations in the discontinuous mode and continuous mode.
) mode ousdiscontinu (
Lfosc
)VV(VI 2
IINDOUTOUT
PK
.................................................................. (17)
mode) s(continuou
Lfosc)V(V2
V)VV(V
I
V
VV
I
DOUT
ININDOUT
OUT
IN
DOUT
PK
................................................................ (18)
fOSC Oscillation frequency, VD 0.4 V.
2. Diode
Use an external diode that meets the following requirements.
Low forward voltage
High switching speed
Reverse breakdown voltage: VOUT [Spike voltage] or more
Rated current: IPK or more
3. Capacitors (CIN, CL)
The capacitor on the input side (CIN) can lower the supply impedance and level the input current for
better efficiency. Select CIN according to the impedance of the power supply to be used.
The capacitor on the output side (CL) is used to smooth the output voltage. Select an appropriate
capacitance value based on the I/O conditions and load conditions. A capacitance of 10 F or more is
recommended.
By adjusting the phase compensation of the feedback loop using the external resistor (RZ) and
capacitor (CZ), a ceramic capacitor can be used as the capacitor on the output side. If a capacitor
whose equivalent series resistance is between 30 m and 500 m is used as the output capacitor, the
adjustable range of the phase compensation is wider; however, note that other characteristics may be
affected by ripple voltage or other conditions at this time. The optimal capacitor differs depending on
the L value, capacitance value, wiring, and application (output load), so select the capacitor after
performing sufficient evaluation under the actual usage conditions.
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
18
4. External transistor
A bipolar (NPN) or enhancement (N-channel) MOS FET transistor can be used as the external
transistor.
4. 1 Bipolar (NPN) type
The driving capability when the output current is increased by using a bipolar transistor is
determined by hFE and Rb of the bipolar transistor. Figure 11 shows a peripheral circuit.
Nch
Pch
R
b
V
IN
I
PK
EXT
C
b
2200 pF
1 k
Figure 11 External Transistor Periphery
1 k is recommended for Rb. Actually, calculate the necessary base current (Ib) from hFE of the
bipolar transistor as follows and select an Rb value lower than this.
Ib = hFE
IPK
Rb = Ib
VIN – 0.7 – IEXTH
0.4
A small Rb increases the output current, but the efficiency decreases. Actually, a pulsating
current flows and a voltage drop occurs due to the wiring capacitance. Determine the optimum
value by experiment.
A speed-up capacitor (Cb) connected in parallel with Rb resistance as shown in Figure 11
decreases the switching loss and improves the efficiency.
Select Cb by observing the following equation.
Cb 2 Rb fOSC 0.7
1
However, in practice, the optimum Cb value also varies depending on the characteristics of the
bipolar transistor employed. Therefore, determine the optimum value of Cb by experiment.
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
19
4. 2 Enhancement MOS FET type
Use an Nch power MOS FET. For high efficiency, using a MOS FET with a low ON resistance
(RON) and small input capacitance (CISS) is ideal, however, ON resistance and input capacitance
generally share a trade-off relationship. The ON resistance is efficient in a range in which the
output current is relatively great during low-frequency switching, and the input capacitance is
efficient in a range in which the output current is middling during high-frequency switching. Select
a MOS FET whose ON resistance and input capacitance are optimal depending on the usage
conditions.
The input voltage (VIN) is supplied for the gate voltage of the MOS FET, so select a MOS FET with
a gate withstanding voltage that is equal to the maximum usage value of the input voltage or
higher and a drain withstanding voltage that is equal to the amount of the output voltage (VOUT)
and diode voltage (VD) or higher.
If a MOS FET with a threshold that is near the UVLO detection voltage is used, a large current
may flow, stopping the output voltage from rising and possibly generating heat in the worst case.
Select a MOS FET with a threshold that is sufficiently lower than the UVLO detection voltage
value.
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
20
5. Oscillation frequency and maximum duty ratio setting resistors (ROSC, RDuty)
With the S-8337/8338 Series, the oscillation frequency can be set in a range of 286 kHz to 1.133 MHz
using external resistance. Connect a resistor across the ROSC and VSS pins. Select the resistor by
using the following equation and referring to Figure 12. However, the following equation and figure
assume that the resistance value is the desired value and show the theoretical values when the IC is
in the typical conditions. Note that fluctuations of resistance and IC are not considered.
140
10
3
R
OSC
[k] f
OSC
[kHz]
1400
1200
1000
800
600
400
200
0
0200 400 600
f
OSC
[kHz]
R
OSC
[k]
Figure 12 ROSC vs. fOSC
With the S-8337 Series, the maximum duty ratio can be set in a range of 47% to 88.5% by an external
resistor. Connect the resistor across the RDuty and VSS pins. Select the resistance by using the
following equation and referring to Figure 13. The maximum duty ratio fluctuates according to the
oscillation frequency. If the value of ROSC is changed, therefore, be sure to change the value of
RDuty so that it is always in proportion to ROSC. However, the following equation and figure assume
that the resistance value is the desired value and show the theoretical values when the IC is in the
typical conditions. Note that fluctuations of resistance and IC are not considered.
(94.5 MaxDuty)
ROSC
RDuty
11.5
100
90
80
70
60
50
40
024
5
MaxDuty [%]
R
Duty
/R
OSC
13
Figure 13 RDut
y
/ROSC vs. MaxDuty
Connect resistors ROSC and RDuty as close to the IC as possible.
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
21
6. Short-circuit protection delay time setting capacitor (CSP)
With the S-8337/8338 Series, the short-circuit protection delay time can be set to any value by an
external capacitor. Connect the capacitor across the CSP and VSS pins. Select the capacitance by
using the following equation and referring to Figure 14. However, the following equation and figure
assume that the capacitor value is the desired value and show the theoretical values when the IC is in
the typical conditions. Note that fluctuations of capacitor and IC are not considered.
CSP [F] 1.0
tPRO [ms] 2 103
120
100
80
60
40
20
0
00.10 0.20 0.25
tPRO [ms]
CSP [F]
0.05 0.15
Figure 14 CSP vs. tPRO
7. Output voltage setting resistors (RFB1, RBF2)
With the S-8337/8338 Series, the output voltage can be set to any value by external divider resistors.
Connect the divider resistors across the VOUT and VSS pins. Because VFB 1 V, the output voltage
can be calculated by this equation.
VOUT RFB2
(RFB1 RFB2)
Connect divider resistors RFB1 and RFB2 as close to the IC to minimize effects from of noise. If noise
does have an effect, adjust the values of RFB1 and RFB2 so that RFB1 RFB2 < 100 k.
CFB connected in parallel with RFB1 is a capacitor for phase compensation. Select the optimum
value of this capacitor at which the stable operation can be ensured from the values of the inductor
and output capacitor.
8. Phase compensation setting resistor and capacitor (RZ, CZ)
The S-8337/8338 Series needs appropriate compensation for the voltage feedback loop to prevent
excessive output ripple and unstable operation from deteriorating the efficiency. This compensation is
implemented by connecting RZ and CZ in series across the CC and VSS pins. RZ sets the
high-frequency gain for a high-speed transient response. CZ sets the pole and zero of the error
amplifier and keeps the loop stable. Adjust RZ and CZ, taking into consideration conditions such as
the inductor, output capacitor, and load current, so that the optimum transient characteristics can be
obtained.
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
22
Standard Circuits
PWM
comparator
VOUT
Timer latch
short-circuit
protection circuit
RDuty (S-8337)
RFB2
VSS
RFB1
FB
SD
L
VIN
EXT
UVLO
CSP CC
RZ
CZ
ROSC
M1
CFB
CIN
Oscillator
Maximum duty circuit
Reference voltage
(1.0 V)
soft-start circuit
Error amplifier
0.1 F
ROSC RDuty
C
L
Ground point
Figure 15 Standard Circuit (S-8337 Series)
PWM
comparator
VOUT
Timer latch
short-circuit
protection circuit
RFB2
VSS
RFB1
FB
SD
L
VIN
EXT
UVLO
CSP CC
RZ
CZ
ROSC
M1
CFB
CIN
Oscillator
Maximum duty circuit
Reference voltage
(1.0 V)
soft-start circuit
Error amplifier
0.1 F
ROSC
C
L
ON/OFF (S-8338)
Ground point
Figure 16 Standard Circuit (S-8338 Series)
Caution The above connection diagram and constant will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constant.
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
23
Precaution
Mount external capacitors, diodes, and inductor as close as possible to the IC.
Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover
rush current flows at the time of a power supply injection. Because these largely depend on the inductor,
the capacitor and impedance of power supply used, fully check them using an actually mounted model.
Make sure the dissipation of the switching transistor (especially at a high temperature) does not exceed
the allowable power dissipation of the package.
The performance of a switching regulator varies depending on the design of the PCB patterns,
peripheral circuits, and external parts. Thoroughly test all settings with your device.
This IC builds in soft start function, starts reference voltage gradually, and it is controlled so that FB pin
voltage and reference voltage become this potential. Therefore, keep in mind that it will be in a
maximum duty state according to the factor of IC exterior if FB pin voltage is held less than reference
voltage.
Although the IC contains a static electricity protection circuit, static electricity or voltage that exceeds
the limit of the protection circuit should not be applied.
ABLIC Inc. assumes no responsibility for the way in which this IC is used on products created using this
IC or for the specifications of that product, nor does ABLIC Inc. assume any responsibility for any
infringement of patents or copyrights by products that include this IC either in Japan or in other
countries.
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
24
Characteristics (Typical Data)
1. Example of Major Temperature Characteristics (Ta 40 to 85C)
ISS1 vs. Ta (VIN 3.3 V)
700
600
500
400
300
200
100
0
40 20 0 20 40 60 80 100
Ta [C]
ISS1
[A]
f
OSC
1133 kHz (R
OSC
120 k
f
OSC
700 kHz (R
OSC
200 k
)
f
OSC
286 kHz (R
OSC
510 k
)
ISSS vs. Ta (VIN 3.3 V)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
40
20 0 20 40 60 80 100
Ta [C]
ISSS
[A]
fOSC 700 kHz (ROSC 200 k)
–200
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
40 20 0 20 40 60 80 100
Ta [C]
IEXTH
[mA]
IEXTH vs. Ta (VIN 3.3 V)
f
OSC
700 kHz, MaxDuty
77% (R
OSC
200 k
, R
Duty
300 k
)
200
180
160
140
120
100
80
60
40
20
0
40
20 0 20 40 60 80 100
Ta [C]
IEXTL
[mA]
IEXTL vs. Ta (VIN 3.3 V)
f
OSC
700 kHz, MaxDuty
77% (R
OSC
200 k
, R
Duty
300 k
)
0.10
0.08
0.06
0.04
0.02
0
–0.02
–0.04
–0.06
–0.08
–0.10
40 20 0 20 40 60 80 100
Ta [C]
IFB
[A]
IFB vs. Ta (VIN 3.3 V) fOSC vs. Ta (VIN 3.3 V)
1400
1200
1000
800
600
400
200
0
40
20 0 20 40 60 80 100
Ta [C]
fOSC
[kHz]
fOSC 1133 kHz (ROSC 120 k)
fOSC 700 kHz (ROSC 200 k)
fOSC 286 kHz (ROSC 510 k)
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
25
100
90
80
70
60
50
40
30
20
10
0
40 20 0 20 40 60 80 100
Ta [C]
MaxDuty
[%]
MaxDuty vs. Ta (VIN 3.3 V)
MaxDuty
88.5% (R
OSC
200 k
, R
Duty
100 k
)
MaxDuty
77% (R
OSC
200 k
, R
Duty
300 k
)
MaxDuty
47% (R
OSC
200 k
, R
Duty
820 k
)
tSS vs. Ta (VIN 3.3 V)
25.0
20.0
15.0
10.0
5.0
0
40
20 0 20 40 60 80 100
Ta [C]
tSS
[ms]
tSS 10 ms
tSS 20 ms
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0
40 20 0 20 40 60 80 100
Ta [C]
tPRO
[ms]
tPRO vs. Ta (VIN 3.3 V)
tPRO 50 ms (CSP 0.1 F)
VUVLO vs. Ta
2.5
2.0
1.5
1.0
0.5
0
40
20 0 20 40 60 80 100
Ta [C]
VUVLO
[V]
VUVLO 2.3 V
VUVLO 1.5 V
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
40 20 0 20 40 60 80 100
Ta [C]
V
UVLOHYS
[V]
VUVLOHYS vs. Ta
VUVLOHYS 0.3 V
VUVLOHYS 0.1 V
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
40
20 0 20 40 60 80 100
Ta [C]
ICCH
[A]
ICCH vs. Ta (VIN 3.3 V)
100
90
80
70
60
50
40
30
20
10
0
40 20 0 20 40 60 80 100
Ta [C]
ICCL
[A]
ICCL vs. Ta (VIN 3.3 V)
1.2
1.0
0.8
0.6
0.4
0.2
0
40
20 0 20 40 60 80 100
Ta [C]
VRTLT
[V]
VRTLT vs. Ta (VIN 3.3 V)
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
26
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
40 20 0 20 40 60 80 100
Ta [C]
VSH
[V]
VSH vs. Ta (VIN 3.3 V)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
40
20 0 20 40 60 80 100
Ta [C]
VSL
[V]
VSL vs. Ta (VIN 3.3 V)
0.1
0
–0.1
40 20 0 20 40 60 80 100
Ta [C]
ISH
[A]
ISH vs. Ta (VIN 3.3 V)
0.1
0
–0.1
40
20 0 20 40 60 80 100
Ta [C]
ISL
[A]
ISL vs. Ta (VIN 3.3 V)
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
27
2. Example of Major Power Supply Dependence Characteristics (Ta 25C)
ISS1 vs. VIN
1200
1000
800
600
400
200
0
0 1 2 3 4 5 6 7
VIN [V]
ISS1
[A]
f
OSC
1133 kHz
(R
OSC
120 k
)
f
OSC
700 kHz
(R
OSC
200 k
)
f
OSC
286 kHz
(R
OSC
510 k
)
ISSS vs. VIN
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
ISSS
[A]
fOSC 700 kHz (ROSC 200 k)
012 3 4 5 6 7
VIN [V]
–200
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
IEXTH
[mA]
IEXTH vs. VIN
0 1 2 3 4 5 6 7
VIN [V]
f
OSC
700 kHz, MaxDuty
77% (R
OSC
200 k
, R
Duty
300 k
)
200
180
160
140
120
100
80
60
40
20
0
IEXTL
[mA]
IEXTL vs. VIN
f
OSC
700 kHz, MaxDuty
77% (R
OSC
200 k
, R
Duty
300 k
)
012 3 4 5 6 7
VIN [V]
0.10
0.08
0.06
0.04
0.02
0
–0.02
–0.04
–0.06
–0.08
–0.10
IFB
[A]
IFB vs. VIN
0 1 2 3 4 5 6 7
VIN [V]
fOSC vs. VIN
1400
1200
1000
800
600
400
200
0
fOSC
[kHz]
012 3 4 5 6 7
VIN [V]
fOSC 1133 kHz (ROSC 120 k)
fOSC 700 kHz (ROSC 200 k)
fOSC 286 kHz (ROSC 510 k)
100
90
80
70
60
50
40
30
20
10
0
MaxDuty
[%]
MaxDuty vs. VIN
0 1 2 3 4 5 6 7
VIN [V]
MaxDuty
88.5%
MaxDuty
47%
MaxDuty
77%
(R
OSC
200 k
, R
Duty
100 k
)(R
OSC
200 k
, R
Duty
300 k
)
(R
OSC
200 k
, R
Duty
820 k
)
tSS vs. VIN
25.0
20.0
15.0
10.0
5.0
0
tSS
[ms]
012 3 4 5 6 7
VIN [V]
tSS 10 ms
tSS 20 ms
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
28
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0
tPRO
[ms]
tPRO vs. VIN
0 1 2 3 4 5 6 7
VIN [V]
tPRO 50 ms (CSP 0.1 F)
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
ICCH
[A]
ICCH vs. VIN
012 3 4 5 6 7
VIN [V]
100
90
80
70
60
50
40
30
20
10
0
ICCL
[A]
ICCL vs. VIN
0 1 2 3 4 5 6 7
VIN [V]
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
VSH
[V]
VSH vs. VIN
012 3 4 5 6 7
VIN [V]
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
VSL
[V]
VSL vs. VIN
0 1 2 3 4 5 6 7
VIN [V]
0.1
0
–0.1
ISH
[A]
ISH vs. VIN
012 3 4 5 6 7
VIN [V]
0.1
0
–0.1
ISL
[A]
ISL vs. VIN
0 1 2 3 4 5 6 7
VIN [V]
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
29
3. Example of External Parts Dependence Characteristics
fOSC vs. ROSC (VIN 3.3 V)
1600
1400
1200
1000
800
600
400
200
0
0 100
200 300 400 500 600
ROSC [k]
fOSC
[kHz]
Ta –40C
Ta 25C
Ta 85C
fOSC vs. ROSC (VIN 5.0 V)
1600
1400
1200
1000
800
600
400
200
0
0 100 200 300 400 500 600
ROSC [k]
fOSC
[kHz]
Ta –40C
Ta 25C
Ta 85C
100
90
80
70
60
50
40
30
20
10
0
MaxDuty
[%]
MaxDuty vs. R
Duty
/R
OSC
(R
OSC
200 k
, V
IN
3.3 V)
0 0.5 1 1.5 2 2.5 3 3.5
RDuty/ROSC
4 4.5 5
Ta –40C
Ta 25C
Ta 85C
100
90
80
70
60
50
40
30
20
10
0
MaxDuty
[%]
MaxDuty vs. R
Duty
/R
OSC
(R
OSC
200 k
, V
IN
5.0 V)
00.51 1.5 2 2.5 3 3.5
RDuty/ROSC
4 4.5 5
Ta –40C
Ta 25C
Ta 85C
tPRO vs. CSP (VIN 3.3 V)
350
300
250
200
150
100
50
0
0 0.1
0.2 0.3 0.4 0.5
CSP [F]
tPRO
[ms]
Ta –40C
Ta 25C
Ta 85C
tPRO vs. CSP (VIN 5.0 V)
350
300
250
200
150
100
50
0
00.1
0.2 0.3 0.4 0.5
CSP [F]
tPRO
[ms]
Ta –40C
Ta 25C
Ta 85C
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
30
4. Examples of Transient Response Characteristics
4. 1 Powering ON (VOUT 9.2 V, VIN 0 V→3.3 V, Ta 25C)
(1) fOSC 1133 kHz, IOUT 0 mA, tSS = 10 ms (2) fOSC 1133 kHz, IOUT 100 mA, tSS = 10 ms
0
2
–
5 0 5 10 15 20
time [ms]
VIN
[V]
0
4
8 VOUT
[V]
4
12
0
2
–
5 0 5 10 15 20
time [ms]
V
IN
[V]
0
4
8 V
OUT
[V]
4
12
(3) fOSC 700 kHz, IOUT 0 mA, tSS = 10 ms (4) fOSC 700 kHz, IOUT 100 mA, tSS = 10 ms
0
2
–
5 0 5 10 15 20
time [ms]
V
IN
[V]
0
4
8 V
OUT
[V]
4
12
0
2
–
5 0 5 10 15 20
time [ms]
V
IN
[V]
0
4
8 V
OUT
[V]
4
12
(5) fOSC 286 kHz, IOUT 0 mA, tSS = 10 ms (6) fOSC 286 kHz, IOUT 100 mA, tSS = 10 ms
0
2
–
5 0 5 10 15 20
time [ms]
V
IN
[V]
0
4
8 V
OUT
[V]
4
12
0
2
–
5 0 5 10 15 20
time [ms]
V
IN
[V]
0
4
8 V
OUT
[V]
4
12
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
31
4. 2 Responses of shutdown pin (VOUT 9.2 V, VON/OFF 0 V3.3 V)
(1) fOSC 1133 kHz, IOUT 0 mA, tSS = 10 ms (2) fOSC 1133 kHz, IOUT 100 mA, tSS = 10 ms
0
2
–
5 0 5 10 15 20
time [ms]
0
4
8 V
OUT
[V]
4
12
V
ON/OFF
[V]
0
2
–
5 0 5 10 15 20
time [ms]
0
4
8 V
OUT
[V]
4
12
V
ON/OFF
[V]
(3) fOSC 700 kHz, IOUT 0 mA, tSS = 10 ms (4) fOSC 700 kHz, IOUT 100 mA, tSS = 10 ms
0
2
–
5 0 5 10 15 20
time [ms]
0
4
8 V
OUT
[V]
4
12
V
ON/OFF
[V]
0
2
–
5 0 5 10 15 20
time [ms]
0
4
8 V
OUT
[V]
4
12
V
ON/OFF
[V]
(5) fOSC 286 kHz, IOUT 0 mA, tSS = 10 ms (6) fOSC 286 kHz, IOUT 100 mA, tSS = 10 ms
0
2
–
5 0 5 10 15 20
time [ms]
0
4
8 V
OUT
[V]
4
12
V
ON/OFF
[V]
0
2
–
5 0 5 10 15 20
time [ms]
0
4
8 V
OUT
[V]
4
12
V
ON/OFF
[V]
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
32
4. 3 Load fluctuations (VOUT 9.2 V, VIN 3.3 V, Ta 25C, RZ = 200 k, CZ = 0.01 F)
(1) fOSC 1133 kHz, IOUT 0.1 mA→100 mA (2) fOSC 1133 kHz, IOUT 100 mA→0.1 mA
–
20
–
10 0 10 20
time [ms]
8.8
9.0
V
OUT
[0.2 V/div] 9.2
I
OUT
100 mA
0.1 mA
9.4
9.6
9.8
10.0
–
20
–
10 0 10 20
time [ms]
8.8
9.0
V
OUT
[0.2 V/div] 9.2
I
OUT
100 mA
0.1 mA
9.4
9.6
9.8
10.0
(3) fOSC 700 kHz, IOUT 0.1 mA→100 mA (4) fOSC 700 kHz, IOUT 100 mA→0.1 mA
–
20
–
10 0 10 20
time [ms]
8.8
9.0
V
OUT
[0.2 V/div] 9.2
I
OUT
100 mA
0.1 mA
9.4
9.6
9.8
10.0
–
20
–
10 0 10 20
time [ms]
8.8
9.0
V
OUT
[0.2 V/div] 9.2
I
OUT
100 mA
0.1 mA
9.4
9.6
9.8
10.0
(5) fOSC 286 kHz, IOUT 0.1 mA→100 mA (6) fOSC 286 kHz, IOUT 100 mA→0.1 mA
–
20
–
10 0 10 20
time [ms]
8.8
9.0
V
OUT
[0.2 V/div] 9.2
I
OUT
100 mA
0.1 mA
9.4
9.6
9.8
10.0
–
20
–
10 0 10 20
time [ms]
8.8
9.0
V
OUT
[0.2 V/div] 9.2
I
OUT
100 mA
0.1 mA
9.4
9.6
9.8
10.0
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
33
4. 4 Input voltage fluctuations (VOUT 9.2 V, IOUT 100 mA, RZ = 200 k, CZ = 0.01 F)
(1) fOSC 1133 kHz, VIN 2.7 V→3.7 V (2) fOSC 1133 kHz, VIN 3.7 V→2.7 V
–
20
–
10 0 10 20
time [ms]
9.15
V
OUT
[V]
9.20
VIN
[
V
]
4.0
3.5
3.0
2.5
9.25
9.30
–
20
–
10 0 10 20
time [ms]
9.15
V
OUT
[V]
9.20
VIN
[
V
]
4.0
3.5
3.0
2.5
9.25
9.30
(3) fOSC 700 kHz, VIN 2.7 V→3.7 V (4) fOSC 700 kHz, VIN 3.7 V→2.7 V
–
20
–
10 0 10 20
time [ms]
9.15
V
OUT
[V]
9.20
VIN
[
V
]
4.0
3.5
3.0
2.5
9.25
9.30
–
20
–
10 0 10 20
time [ms]
9.15
V
OUT
[V]
9.20
VIN
[
V
]
4.0
3.5
3.0
2.5
9.25
9.30
(5) fOSC 286 kHz, VIN 2.7 V→3.7 V (6) fOSC 286 kHz, VIN 3.7 V→2.7 V
–
20
–
10 0 10 20
time [ms]
9.15
V
OUT
[V]
9.20
VIN
[
V
]
4.0
3.5
3.0
2.5
9.25
9.30
–
20
–
10 0 10 20
time [ms]
9.15
V
OUT
[V]
9.20
VIN
[
V
]
4.0
3.5
3.0
2.5
9.25
9.30
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
34
Reference Data
1. Reference data for external parts
Table 8 Properties of External Parts
Element Name Product Name Manufacture Characteristics
Inductor LDR655312T
TDK Corporation 4.7
H, DCR
*1
= 206 m
, I
MAX
*2
= 0.9 A,
Height = 1.2 mm
Diode RB491D
Rohm Co., Ltd. V
F
*3
= 0.45 V, I
F
*4
= 1.0 A
Output capacitor
16 V, 10
F
Transistor MCH3406
Sanyo Electric Co., Ltd. V
DSS
*5
= 20 V, V
GSS
*6
=
10 V, C
iss
*7
= 280 pF,
R
DS
(
ON
)
*8
= 82 m
max. (V
GS
*9
= 2.5 V, I
D
*10
= 1 A)
*1. DCR : DC resistance
*2. IMAX : Maximum allowable current
*3. VF : Forward voltage
*4. IF : Forward current
*5. VDSS : Drain to source voltage (When between gate and source short circuits)
*6. VGSS : Gate to source voltage (When between drain and source short circuits)
*7. Ciss : Input capacitance
*8. RDS(ON) : Drain to source on resistance
*9. VGS : Gate to source voltage
*10. ID : Drain current
Caution The values shown in the characteristics column of Table 8 above are based on the
materials provided by each manufacturer. However, consider the characteristics of the
original materials when using the above products.
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
35
2. Reference data (1)
The data of (a) output current (IOUT) vs. efficiency (
) characteristics and (b) output current (IOUT) vs.
output voltage (VOUT) characteristics is shown below.
2. 1 VOUT 13.1 V (RFB1 7.5 k, RFB2 620 )
(1) fOSC 1133 kHz, MaxDuty = 77 % (ROSC 120 k, RDut
y
180 k)
(a) IOUT vs. (b) IOUT vs. VOUT
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
[%]
I
OUT
[mA]
0.01
V
IN
5.0 V
13.20
13.15
13.10
13.05
13.00
12.95
12.90
V
OUT
[V]
1 10 100 10000.1
I
OUT
[mA]
0.01
V
IN
5.0 V
(2) fOSC 700 kHz, MaxDuty = 77 % (ROSC 200 k, RDut
y
300 k)
(a) IOUT vs. (b) IOUT vs. VOUT
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
[%]
I
OUT
[mA]
0.01
V
IN
5.0 V
13.20
13.15
13.10
13.05
13.00
12.95
12.90
V
OUT
[V]
1 10 100 10000.1
I
OUT
[mA]
0.01
V
IN
5.0 V
(3) fOSC 286 kHz, MaxDuty = 77 % (ROSC 510 k, RDut
y
750 k)
(a) IOUT vs. (b) IOUT vs. VOUT
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
[%]
I
OUT
[mA]
0.01
V
IN
5.0 V
13.20
13.15
13.10
13.05
13.00
12.95
12.90
V
OUT
[V]
1 10 100 10000.1
I
OUT
[mA]
0.01
V
IN
5.0 V
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
36
2. 2 VOUT 9.2 V (RFB1 8.2 k, RFB2 1.0 k)
(1) fOSC 1133 kHz, MaxDuty = 77 % (ROSC 120 k, RDut
y
180 k)
(a) IOUT vs. (b) IOUT vs. VOUT
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
[%]
I
OUT
[mA]
0.01
V
IN
5.0 V
V
IN
3.3 V
9.30
9.25
9.20
9.15
9.10
9.05
9.00
VOUT
[V]
1 10 100 10000.1
IOUT [mA]
0.01
V
IN
5.0 V
V
IN
3.3 V
(2) fOSC 700 kHz, MaxDuty = 77 % (ROSC 200 k, RDut
y
300 k)
(a) IOUT vs. (b) IOUT vs. VOUT
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
[%]
I
OUT
[mA]
0.01
V
IN
5.0 V
V
IN
3.3 V
9.30
9.25
9.20
9.15
9.10
9.05
9.00
VOUT
[V]
1 10 100 10000.1
IOUT [mA]
0.01
V
IN
5.0 V
V
IN
3.3 V
(3) fOSC 286 kHz, MaxDuty = 77 % (ROSC 510 k, RDut
y
750 k)
(a) IOUT vs. (b) IOUT vs. VOUT
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
[%]
I
OUT
[mA]
0.01
V
IN
5.0 V
V
IN
3.3 V
9.30
9.25
9.20
9.15
9.10
9.05
9.00
VOUT
[V]
1 10 100 10000.1
IOUT [mA]
0.01
V
IN
5.0 V
V
IN
3.3 V
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
37
2. 3 VOUT 6.1 V (RFB1 5.1 k, RFB2 1.0 k)
(1) fOSC 1133 kHz, MaxDuty = 77 % (ROSC 120 k, RDut
y
180 k)
(a) IOUT vs. (b) IOUT vs. VOUT
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
[%]
I
OUT
[mA]
0.01
V
IN
3.3 V
V
IN
1.8 V
6.20
6.15
6.10
6.05
6.00
5.95
5.90
VOUT
[V]
1 10 100 10000.1
IOUT [mA]
0.01
V
IN
3.3 V
V
IN
1.8 V
(2) fOSC 700 kHz, MaxDuty = 77 % (ROSC 200 k, RDut
y
300 k)
(a) IOUT vs. (b) IOUT vs. VOUT
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
[%]
I
OUT
[mA]
0.01
V
IN
3.3 V
V
IN
1.8 V
6.20
6.15
6.10
6.05
6.00
5.95
5.90
VOUT
[V]
1 10 100 10000.1
IOUT [mA]
0.01
V
IN
3.3 V
V
IN
1.8 V
(3) fOSC 286 kHz, MaxDuty = 77 % (ROSC 510 k, RDut
y
750 k)
(a) IOUT vs. (b) IOUT vs. VOUT
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
[%]
I
OUT
[mA]
0.01
V
IN
3.3 V
V
IN
1.8 V
6.20
6.15
6.10
6.05
6.00
5.95
5.90
VOUT
[V]
1 10 100 10000.1
IOUT [mA]
0.01
V
IN
3.3 V
V
IN
1.8 V
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
38
3. Reference data (2)
The data of output current (IOUT) vs. ripple voltage (Vr) characteristics is shown below.
3. 1 VOUT 13.1 V (RFB1 7.5 k, RFB2 620 )
(1)
f
OSC
1133 kHz, MaxDuty = 77 % (R
OSC
120 k
, R
Dut
y
180 k
)
(2)
f
OSC
700 kHz, MaxDuty = 77 % (R
OSC
200 k
, R
Dut
y
300 k
)
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
Vr
[mV]
I
OUT
[mA]
0.01
V
IN
5.0 V
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
Vr
[mV]
I
OUT
[mA]
0.01
V
IN
5.0 V
(3)
f
OSC
286 kHz, MaxDuty = 77 % (R
OSC
510 k
, R
Dut
y
750 k
)
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
Vr
[mV]
I
OUT
[mA]
0.01
V
IN
5.0 V
3. 2 VOUT 9.2 V (RFB1 8.2 k, RFB2 1.0 k)
(1)
f
OSC
1133 kHz, MaxDuty = 77 % (R
OSC
120 k
, R
Dut
y
180 k
)
(2)
f
OSC
700 kHz, MaxDuty = 77 % (R
OSC
200 k
, R
Dut
y
300 k
)
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
Vr
[mV]
I
OUT
[mA]
0.01
V
IN
5.0 V
V
IN
3.3 V
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
Vr
[mV]
I
OUT
[mA]
0.01
V
IN
5.0 V
V
IN
3.3 V
(3)
f
OSC
286 kHz, MaxDuty = 77 % (R
OSC
510 k
, R
Dut
y
750 k
)
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
Vr
[mV]
I
OUT
[mA]
0.01
V
IN
5.0 V
V
IN
3.3 V
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
39
3. 3 VOUT 6.1 V (RFB1 5.1 k, RFB2 1.0 k)
(1)
f
OSC
1133 kHz, MaxDuty = 77 % (R
OSC
120 k
, R
Dut
y
180 k
)
(2)
f
OSC
700 kHz, MaxDuty = 77 % (R
OSC
200 k
, R
Dut
y
300 k
)
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
Vr
[mV]
I
OUT
[mA]
0.01
V
IN
3.3 V
V
IN
1.8 V
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
Vr
[mV]
I
OUT
[mA]
0.01
V
IN
3.3 V
V
IN
1.8 V
(3)
f
OSC
286 kHz, MaxDuty = 77 % (R
OSC
510 k
, R
Dut
y
750 k
)
100
90
80
70
60
50
40
30
20
10
0
1 10 100 10000.1
Vr
[mV]
I
OUT
[mA]
0.01
V
IN
3.3 V
V
IN
1.8 V
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
40
Marking Specification
(1) 8-Pin SON(A)
8-Pin SON(A)
Top view
8
5
(
1
)
(2)
(
3
)
(5) (6) (7)
(
4
)
(8)
1
2
(1) ~ (3) Product code (Refer to Product name vs. Product code)
(4) ~ (8) Lot number
Product name vs. Product code
(a) S-8337Series
Product name Product code Product name Product code
(1) (2) (3) (1) (2) (3)
S-8337AAAA-P8T1G O B A S-8337ABEC-P8T1G O D N
S-8337AAAB-P8T1G O B B S-8337ABFA-P8T1G O D O
S-8337AAAC-P8T1G O B 2 S-8337ABFB-P8T1G O D P
S-8337AABA-P8T1G O B C S-8337ABFC-P8T1G O D Q
S-8337AABB-P8T1G O B D S-8337ABGA-P8T1G O D R
S-8337AABC-P8T1G O B E S-8337ABGB-P8T1G O D S
S-8337AACA-P8T1G O B F S-8337ABGC-P8T1G O D T
S-8337AACB-P8T1G O B G S-8337ABHA-P8T1G O D U
S-8337AACC-P8T1G O B H S-8337ABHB-P8T1G O D V
S-8337AADA-P8T1G O B I S-8337ABHC-P8T1G O D W
S-8337AADB-P8T1G O B J S-8337ABIA-P8T1G O D X
S-8337AADC-P8T1G O B K S-8337ABIB-P8T1G O D Y
S-8337AAEA-P8T1G O B L S-8337ABIC-P8T1G O D Z
S-8337AAEB-P8T1G O B M S-8337ACAA-P8T1G O J A
S-8337AAEC-P8T1G O B N S-8337ACAB-P8T1G O J B
S-8337AAFA-P8T1G O B O S-8337ACAC-P8T1G O J 2
S-8337AAFB-P8T1G O B P S-8337ACBA-P8T1G O J C
S-8337AAFC-P8T1G O B Q S-8337ACBB-P8T1G O J D
S-8337AAGA-P8T1G O B R S-8337ACBC-P8T1G O J E
S-8337AAGB-P8T1G O B S S-8337ACCA-P8T1G O J F
S-8337AAGC-P8T1G O B T S-8337ACCB-P8T1G O J G
S-8337AAHA-P8T1G O B U S-8337ACCC-P8T1G O J H
S-8337AAHB-P8T1G O B V S-8337ACDA-P8T1G O J I
S-8337AAHC-P8T1G O B W S-8337ACDB-P8T1G O J J
S-8337AAIA-P8T1G O B X S-8337ACDC-P8T1G O J K
S-8337AAIB-P8T1G O B Y S-8337ACEA-P8T1G O J L
S-8337AAIC-P8T1G O B Z S-8337ACEB-P8T1G O J M
S-8337ABAA-P8T1G O D A S-8337ACEC-P8T1G O J N
S-8337ABAB-P8T1G O D B S-8337ACFA-P8T1G O J O
S-8337ABAC-P8T1G O D 2 S-8337ACFB-P8T1G O J P
S-8337ABBA-P8T1G O D C S-8337ACFC-P8T1G O J Q
S-8337ABBB-P8T1G O D D S-8337ACGA-P8T1G O J R
S-8337ABBC-P8T1G O D E S-8337ACGB-P8T1G O J S
S-8337ABCA-P8T1G O D F S-8337ACGC-P8T1G O J T
S-8337ABCB-P8T1G O D G S-8337ACHA-P8T1G O J U
S-8337ABCC-P8T1G O D H S-8337ACHB-P8T1G O J V
S-8337ABDA-P8T1G O D I S-8337ACHC-P8T1G O J W
S-8337ABDB-P8T1G O D J S-8337ACIA-P8T1G O J X
S-8337ABDC-P8T1G O D K S-8337ACIB-P8T1G O J Y
S-8337ABEA-P8T1G O D L S-8337ACIC-P8T1G O J Z
S-8337ABEB-P8T1G O D M
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
41
(b) S-8338 Series
Product name Product code Product name Product code
(1) (2) (3) (1) (2) (3)
S-8338AAAA-P8T1G O C A S-8338ABEC-P8T1G O I N
S-8338AAAB-P8T1G O C B S-8338ABFA-P8T1G O I O
S-8338AAAC-P8T1G O C 2 S-8338ABFB-P8T1G O I P
S-8338AABA-P8T1G O C C S-8338ABFC-P8T1G O I Q
S-8338AABB-P8T1G O C D S-8338ABGA-P8T1G O I R
S-8338AABC-P8T1G O C E S-8338ABGB-P8T1G O I S
S-8338AACA-P8T1G O C F S-8338ABGC-P8T1G O I T
S-8338AACB-P8T1G O C G S-8338ABHA-P8T1G O I U
S-8338AACC-P8T1G O C H S-8338ABHB-P8T1G O I V
S-8338AADA-P8T1G O C I S-8338ABHC-P8T1G O I W
S-8338AADB-P8T1G O C J S-8338ABIA-P8T1G O I X
S-8338AADC-P8T1G O C K S-8338ABIB-P8T1G O I Y
S-8338AAEA-P8T1G O C L S-8338ABIC-P8T1G O I Z
S-8338AAEB-P8T1G O C M S-8338ACAA-P8T1G O K A
S-8338AAEC-P8T1G O C N S-8338ACAB-P8T1G O K B
S-8338AAFA-P8T1G O C O S-8338ACAC-P8T1G O K 2
S-8338AAFB-P8T1G O C P S-8338ACBA-P8T1G O K C
S-8338AAFC-P8T1G O C Q S-8338ACBB-P8T1G O K D
S-8338AAGA-P8T1G O C R S-8338ACBC-P8T1G O K E
S-8338AAGB-P8T1G O C S S-8338ACCA-P8T1G O K F
S-8338AAGC-P8T1G O C T S-8338ACCB-P8T1G O K G
S-8338AAHA-P8T1G O C U S-8338ACCC-P8T1G O K H
S-8338AAHB-P8T1G O C V S-8338ACDA-P8T1G O K I
S-8338AAHC-P8T1G O C W S-8338ACDB-P8T1G O K J
S-8338AAIA-P8T1G O C X S-8338ACDC-P8T1G O K K
S-8338AAIB-P8T1G O C Y S-8338ACEA-P8T1G O K L
S-8338AAIC-P8T1G O C Z S-8338ACEB-P8T1G O K M
S-8338ABAA-P8T1G O I A S-8338ACEC-P8T1G O K N
S-8338ABAB-P8T1G O I B S-8338ACFA-P8T1G O K O
S-8338ABAC-P8T1G O I 2 S-8338ACFB-P8T1G O K P
S-8338ABBA-P8T1G O I C S-8338ACFC-P8T1G O K Q
S-8338ABBB-P8T1G O I D S-8338ACGA-P8T1G O K R
S-8338ABBC-P8T1G O I E S-8338ACGB-P8T1G O K S
S-8338ABCA-P8T1G O I F S-8338ACGC-P8T1G O K T
S-8338ABCB-P8T1G O I G S-8338ACHA-P8T1G O K U
S-8338ABCC-P8T1G O I H S-8338ACHB-P8T1G O K V
S-8338ABDA-P8T1G O I I S-8338ACHC-P8T1G O K W
S-8338ABDB-P8T1G O I J S-8338ACIA-P8T1G O K X
S-8338ABDC-P8T1G O I K S-8338ACIB-P8T1G O K Y
S-8338ABEA-P8T1G O I L S-8338ACIC-P8T1G O K Z
S-8338ABEB-P8T1G O I M
STEP-UP, 1.2 MHz
HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series Rev.4.0_02
42
(2) 8-Pin TSSOP
8-Pin TSSOP
Top view
(
1
)
(
2
)
(
3
)
(
4
)
(
5
)
(
6
)
(
7
)
(
8
)
(
11
)
(
12
)
(
13
)
(
14
)
(
9
)
(
10
)
1
4
8
5
(1) ~ (4)
Product name: 8337 or 8338 (Fixed)
8337 indicates S-8337 series.
8338 indicates S-8338 series.
(5) ~ (8)
Function code (Refer to
Product name vs. Function code
)
(9) ~ (14)
Lot number
Product name vs. Function code
(a) S-8337 Series
Product name Function code Product name Function code
(5) (6) (7) (8) (5) (6) (7) (8)
S-8337AAAA-T8T1x A A A A S-8337ABEC-T8T1x A B E C
S-8337AAAB-T8T1x A A A B S-8337ABFA-T8T1x A B F A
S-8337AAAC-T8T1x A A A C S-8337ABFB-T8T1x A B F B
S-8337AABA-T8T1x A A B A S-8337ABFC-T8T1x A B F C
S-8337AABB-T8T1x A A B B S-8337ABGA-T8T1x A B G A
S-8337AABC-T8T1x A A B C S-8337ABGB-T8T1x A B G B
S-8337AACA-T8T1x A A C A S-8337ABGC-T8T1x A B G C
S-8337AACB-T8T1x A A C B S-8337ABHA-T8T1x A B H A
S-8337AACC-T8T1x A A C C S-8337ABHB-T8T1x A B H B
S-8337AADA-T8T1x A A D A S-8337ABHC-T8T1x A B H C
S-8337AADB-T8T1x A A D B S-8337ABIA-T8T1x A B I A
S-8337AADC-T8T1x A A D C S-8337ABIB-T8T1x A B I B
S-8337AAEA-T8T1x A A E A S-8337ABIC-T8T1x A B I C
S-8337AAEB-T8T1x A A E B S-8337ACAA-T8T1x A C A A
S-8337AAEC-T8T1x A A E C S-8337ACAB-T8T1x A C A B
S-8337AAFA-T8T1x A A F A S-8337ACAC-T8T1x A C A C
S-8337AAFB-T8T1x A A F B S-8337ACBA-T8T1x A C B A
S-8337AAFC-T8T1x A A F C S-8337ACBB-T8T1x A C B B
S-8337AAGA-T8T1x A A G A S-8337ACBC-T8T1x A C B C
S-8337AAGB-T8T1x A A G B S-8337ACCA-T8T1x A C C A
S-8337AAGC-T8T1x A A G C S-8337ACCB-T8T1x A C C B
S-8337AAHA-T8T1x A A H A S-8337ACCC-T8T1x A C C C
S-8337AAHB-T8T1x A A H B S-8337ACDA-T8T1x A C D A
S-8337AAHC-T8T1x A A H C S-8337ACDB-T8T1x A C D B
S-8337AAIA-T8T1x A A I A S-8337ACDC-T8T1x A C D C
S-8337AAIB-T8T1x A A I B S-8337ACEA-T8T1x A C E A
S-8337AAIC-T8T1x A A I C S-8337ACEB-T8T1x A C E B
S-8337ABAA-T8T1x A B A A S-8337ACEC-T8T1x A C E C
S-8337ABAB-T8T1x A B A B S-8337ACFA-T8T1x A C F A
S-8337ABAC-T8T1x A B A C S-8337ACFB-T8T1x A C F B
S-8337ABBA-T8T1x A B B A S-8337ACFC-T8T1x A C F C
S-8337ABBB-T8T1x A B B B S-8337ACGA-T8T1x A C G A
S-8337ABBC-T8T1x A B B C S-8337ACGB-T8T1x A C G B
S-8337ABCA-T8T1x A B C A S-8337ACGC-T8T1x A C G C
S-8337ABCB-T8T1x A B C B S-8337ACHA-T8T1x A C H A
S-8337ABCC-T8T1x A B C C S-8337ACHB-T8T1x A C H B
S-8337ABDA-T8T1x A B D A S-8337ACHC-T8T1x A C H C
S-8337ABDB-T8T1x A B D B S-8337ACIA-T8T1x A C I A
S-8337ABDC-T8T1x A B D C S-8337ACIB-T8T1x A C I B
S-8337ABEA-T8T1x A B E A S-8337ACIC-T8T1x A C I C
S-8337ABEB-T8T1x A B E B
Remark 1. x: G or U
2. Please select products of environmental code = U for Sn 100%, halogen-free products.
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_02 S-8337/8338 Series
43
(b) S-8338 Series
Product name Function code Product name Function code
(5) (6) (7) (8) (5) (6) (7) (8)
S-8338AAAA-T8T1x A A A A S-8338ABEC-T8T1x A B E C
S-8338AAAB-T8T1x A A A B S-8338ABFA-T8T1x A B F A
S-8338AAAC-T8T1x A A A C S-8338ABFB-T8T1x A B F B
S-8338AABA-T8T1x A A B A S-8338ABFC-T8T1x A B F C
S-8338AABB-T8T1x A A B B S-8338ABGA-T8T1x A B G A
S-8338AABC-T8T1x A A B C S-8338ABGB-T8T1x A B G B
S-8338AACA-T8T1x A A C A S-8338ABGC-T8T1x A B G C
S-8338AACB-T8T1x A A C B S-8338ABHA-T8T1x A B H A
S-8338AACC-T8T1x A A C C S-8338ABHB-T8T1x A B H B
S-8338AADA-T8T1x A A D A S-8338ABHC-T8T1x A B H C
S-8338AADB-T8T1x A A D B S-8338ABIA-T8T1x A B I A
S-8338AADC-T8T1x A A D C S-8338ABIB-T8T1x A B I B
S-8338AAEA-T8T1x A A E A S-8338ABIC-T8T1x A B I C
S-8338AAEB-T8T1x A A E B S-8338ACAA-T8T1x A C A A
S-8338AAEC-T8T1x A A E C S-8338ACAB-T8T1x A C A B
S-8338AAFA-T8T1x A A F A S-8338ACAC-T8T1x A C A C
S-8338AAFB-T8T1x A A F B S-8338ACBA-T8T1x A C B A
S-8338AAFC-T8T1x A A F C S-8338ACBB-T8T1x A C B B
S-8338AAGA-T8T1x A A G A S-8338ACBC-T8T1x A C B C
S-8338AAGB-T8T1x A A G B S-8338ACCA-T8T1x A C C A
S-8338AAGC-T8T1x A A G C S-8338ACCB-T8T1x A C C B
S-8338AAHA-T8T1x A A H A S-8338ACCC-T8T1x A C C C
S-8338AAHB-T8T1x A A H B S-8338ACDA-T8T1x A C D A
S-8338AAHC-T8T1x A A H C S-8338ACDB-T8T1x A C D B
S-8338AAIA-T8T1x A A I A S-8338ACDC-T8T1x A C D C
S-8338AAIB-T8T1x A A I B S-8338ACEA-T8T1x A C E A
S-8338AAIC-T8T1x A A I C S-8338ACEB-T8T1x A C E B
S-8338ABAA-T8T1x A B A A S-8338ACEC-T8T1x A C E C
S-8338ABAB-T8T1x A B A B S-8338ACFA-T8T1x A C F A
S-8338ABAC-T8T1x A B A C S-8338ACFB-T8T1x A C F B
S-8338ABBA-T8T1x A B B A S-8338ACFC-T8T1x A C F C
S-8338ABBB-T8T1x A B B B S-8338ACGA-T8T1x A C G A
S-8338ABBC-T8T1x A B B C S-8338ACGB-T8T1x A C G B
S-8338ABCA-T8T1x A B C A S-8338ACGC-T8T1x A C G C
S-8338ABCB-T8T1x A B C B S-8338ACHA-T8T1x A C H A
S-8338ABCC-T8T1x A B C C S-8338ACHB-T8T1x A C H B
S-8338ABDA-T8T1x A B D A S-8338ACHC-T8T1x A C H C
S-8338ABDB-T8T1x A B D B S-8338ACIA-T8T1x A C I A
S-8338ABDC-T8T1x A B D C S-8338ACIB-T8T1x A C I B
S-8338ABEA-T8T1x A B E A S-8338ACIC-T8T1x A C I C
S-8338ABEB-T8T1x A B E B
Remark 1. x: G or U
2. Please select products of environmental code = U for Sn 100%, halogen-free products.
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
mm
No. PN008-A-P-SD-2.0
PN008-A-P-SD-2.0
SON8A-A-PKG Dimensions
2.90±0.2
85
0.475typ.
14
0.30
0.65
0.125 +0.1
-0.05
+0.1
-0.05
(ø1.0)
(2.3)
0.80±0.1
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
ø1.05±0.05
0.2±0.05
1.5±0.1
ø1.55±0.05
2.0±0.05
4.0±0.1
3.3±0.1 4.0±0.1
mm
1
4
58
No. PN008-A-C-SD-1.1
PN008-A-C-SD-1.1
SON8A-A-Carrier Tape
Feed direction
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
(1.2)
9.0±0.3
mm
QTY. 3,000
3.0±0.2
11.4±1.0
No. PN008-A-R-SD-1.1
PN008-A-R-SD-1.1
SON8A-A-Reel
Enlarged drawing in the central part
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
TSSOP8-E-PKG Dimensions
No. FT008-A-P-SD-1.2
FT008-A-P-SD-1.2
0.17±0.05
3.00 +0.3
-0.2
0.65
0.2±0.1
14
5
8
mm
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
ø1.55±0.05
2.0±0.05
8.0±0.1 ø1.55 +0.1
-0.05
(4.4)
0.3±0.05
1
45
8
4.0±0.1
Feed direction
TSSOP8-E-Carrier Tape
No. FT008-E-C-SD-1.0
FT008-E-C-SD-1.0
+0.4
-0.2
6.6
mm
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
Enlarged drawing in the central part
No. FT008-E-R-SD-1.0
2±0.5
ø13±0.5
ø21±0.8
13.4±1.0
17.5±1.0
3,000
QTY.
TSSOP8-E-Reel
FT008-E-R-SD-1.0
mm
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
Enlarged drawing in the central part
2±0.5
ø13±0.5
ø21±0.8
13.4±1.0
17.5±1.0
4,000
QTY.
TSSOP8-E-Reel
FT008-E-R-S1-1.0
mm
No. FT008-E-R-S1-1.0
Disclaimers (Handling Precautions)
1. All the information described herein
(product data,
specifications,
figures,
tables,
programs,
algorithms and application
circuit examples,
etc.)
is current as of publishing date of this document and is subject to change without notice.
2. The circuit examples and the usages described herein are for reference only, and do not guarantee the success of
any specific mass-production design.
ABLIC Inc. is not responsible for damages caused by the reasons other than the products described herein
(hereinafter "the products") or infringement of third-party intellectual property right and any other right due to the use
of the information described herein.
3. ABLIC Inc. is not responsible for damages caused by the incorrect information described herein.
4. Be careful to use the products within their specified ranges. Pay special attention to the absolute maximum ratings,
operation voltage range and electrical characteristics, etc.
ABLIC Inc. is not responsible for damages caused by failures and / or accidents, etc. that occur due to the use of the
products outside their specified ranges.
5. When using the products, confirm their applications, and the laws and regulations of the region or country where they
are used and verify suitability, safety and other factors for the intended use.
6. When exporting the products, comply with the Foreign Exchange and Foreign Trade Act and all other export-related
laws, and follow the required procedures.
7. The products must not be used or provided (exported) for the purposes of the development of weapons of mass
destruction or military use. ABLIC Inc. is not responsible for any provision (export) to those whose purpose is to
develop, manufacture, use or store nuclear, biological or chemical weapons, missiles, or other military use.
8. The products are not designed to be used as part of any device or equipment that may affect the human body, human
life, or assets (such as medical equipment, disaster prevention systems, security systems, combustion control
systems, infrastructure control systems, vehicle equipment, traffic systems, in-vehicle equipment, aviation equipment,
aerospace equipment, and nuclear-related equipment), excluding when specified for in-vehicle use or other uses. Do
not apply the products to the above listed devices and equipments without prior written permission by ABLIC Inc.
Especially, the products cannot be used for life support devices, devices implanted in the human body and devices
that directly affect human life, etc.
Prior consultation with our sales office is required when considering the above uses.
ABLIC Inc. is not responsible for damages caused by unauthorized or unspecified use of our products.
9. Semiconductor products may fail or malfunction with some probability.
The user of the products should therefore take responsibility to give thorough consideration to safety design including
redundancy, fire spread prevention measures, and malfunction prevention to prevent accidents causing injury or
death, fires and social damage, etc. that may ensue from the products' failure or malfunction.
The entire system must be sufficiently evaluated and applied on customer's own responsibility.
10. The products are not designed to be radiation-proof. The necessary radiation measures should be taken in the
product design by the customer depending on the intended use.
11. The products do not affect human health under normal use. However, they contain chemical substances and heavy
metals and should therefore not be put in the mouth. The fracture surfaces of wafers and chips may be sharp. Be
careful when handling these with the bare hands to prevent injuries, etc.
12. When disposing of the products, comply with the laws and ordinances of the country or region where they are used.
13. The information described herein contains copyright information and know-how of ABLIC Inc.
The information described herein does not convey any license under any intellectual property rights or any other
rights belonging to ABLIC Inc. or a third party. Reproduction or copying of the information from this document or any
part of this document described herein for the purpose of disclosing it to a third-party without the express permission
of ABLIC Inc. is strictly prohibited.
14. For more details on the information described herein, contact our sales office.
2.2-2018.06
www.ablic.com
