DS04-27230-2E
FUJITSU SEMICONDUCTOR
DATA SHEET
ASSP For Power Supply Applications
(DC/DC Converter for DSC/Camcorder)
4-ch DC/DC Converter IC
for low voltage
MB39A103
■DESCRIPTION
The MB39A103 is a 4-channel DC/DC converter IC using pulse width modulation (PWM). This IC is ideal for up
conversion, down conversion, and up/down conversion.
Achievement of low voltage start-up (1.7 V to) enables operation from low voltage.
4ch is built in TSSOP-30P/package. Each channel can be controlled, and soft-start.
This is an ideal power supply for high-performance portable devices such as digital still cameras.
This product is covered by US Patent Number 6,147,477.
■FEATURES
• Supports for down-conversion and up/down Zeta conversion (CH1)
• Supports for up-conversion and up/down Sepic conversion (CH2 to CH4)
• Low voltage start-up (CH4): 1.7 V
• Power supply voltage range : 2.5 V to 11 V
• Reference voltage : 2.0 V ± 1 %
• Error amplifier threshold voltage : 1.24 V ± 1.5 %
• Built-in totem-pole type output for MOS FET
• Built-in soft-start circuit independent of loads
• High-frequency operation capability: 1.5 MHz (Max)
• External short-circuit detection capability by −INS terminal
■PACKAGES
30-pin plastic TSSOP 32-pad plastic BCC
(FPT-30P-M04) (LCC-32P-M08)
MB39A103
2
■PIN ASSIGNMENTS
(Continued)
(TOP VIEW)
(FPT-30P-M04)
CS2
−INE2
FB2
DTC2
VCC
CTL
VREF
RT
CT
GND
CSCP
DTC3
FB3
−INE3
CS3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
CS1
−INE1
FB1
DTC1
VCCO
OUT1
OUT2
OUT3
OUT4
GNDO
−INS
DTC4
FB4
−INE4
CS4
MB39A103
3
(Continued)
(TOP VIEW)
(Penetration fig from surface)
(LCC-32P-M08)
DTC2 1 32
N.C.
31 29 2830 27 26
VCC 2
CTL 3
VREF 4
RT 5
CT 6
GND 7
CSCP 8
N.C.
DTC1
VCCO
OUT1
OUT2
OUT3
OUT4
GNDO
−INS
DTC4910
DTC3
FB2FB3
−INE2−INE3
CS2CS3
CS1CS4
−INE1−INE4
FB1FB4
11 12 13 14 15 16
25
24
23
22
21
20
19
18
17
MB39A103
4
■PIN DESCRIPTION
Block Pin No. Symbol I/O Descriptions
TSSOP BCC
CH1
27 25 DTC1 I Dead time control terminal
28 26 FB1 O Error amplifier output terminal
29 27 −INE1 I Error amplifier inverted input terminal
30 28 CS1 Soft-start setting capacitor connection terminal
25 23 OUT1 O Totem pole type output terminal
CH2
4 1 DTC2 I Dead time control terminal
331 FB2 OError amplifier output terminal
230−INE2 I Error amplifier inverted input terminal
129 CS2 Soft-start setting capacitor connection terminal
24 22 OUT2 O Totem pole type output terminal
CH3
12 10 DTC3 I Dead time control terminal
13 11 FB3 O Error amplifier output terminal
14 12 −INE3 I Error amplifier inverted input terminal
15 13 CS3 Soft-start setting capacitor connection terminal
23 21 OUT3 O Totem pole type output terminal
CH4
19 17 DTC4 I Dead time control terminal
18 16 FB4 O Error amplifier output terminal
17 15 −INE4 I Error amplifier inverted input terminal
16 14 CS4 Soft-start setting capacitor connection terminal
22 20 OUT4 O Totem pole type output terminal
OSC 96 CT Triangular wave frequency setting capacitor
connection terminal
85 RT Triangular wave frequency setting resistor
connection terminal
Control
63 CTL I
Power supply control terminal
11 8 CSCP Short-circuit detection circuit capacitor connection
terminal
20 18 −INS I Short-circuit detection comparator inverted input
terminal
Power
26 24 VCCO Output block powe r supply terminal
52VCCPower supply terminal
74VREFO
Reference voltage output terminal
21 19 GNDO Output block ground terminal
10 7 GND Ground terminal
MB39A103
5
■BLOCK DIAGRAM
VCCO
OUT1
OUT2
OUT3
OUT4
GNDO
VCC
CTL
−INE1
CS1
FB1
DTC1
−INE2
CS2
FB2
DTC2
−INE3
CS3
FB3
DTC3
−INE4
CS4
−INS
CSCP
FB4
DTC4
VREF
Pch
CH1
CH2
CH3
CH4
Error
Amp1 PWM
Comp.1 Drive1
10 µA
1.24 V
−
+
+−
+
+
IO = 130 mA
at VCCO = 4 V
Nch
Error
Amp2 Drive2
10 µA−
+
+−
+
+
IO = 130 mA
at VCCO = 4 V
Nch
Error
Amp3 Drive3
10 µA−
+
+−
+
+
IO = 130 mA
at VCCO = 4 V
VREF
Nch
Error
Amp4
SCP
Comp.
Drive4
SCP
OSC
UVLO2
UVLO1
RT CT VREF
2.0 V
VREF VR1 Power
ON/OFF
CTL
bias
GND
10 µA
100 kΩ
1 V
0.9 V
0.4 V
−
+
+
−
+
−
+
+
IO = 130 mA
at VCCO = 4 V
29
30
28
27
2
1
3
4
14
15
13
12
17
16
18
19
20
11
8 9 7 10
6
5
21
22
23
24
25
26
VREF
1.24 V
VREF
1.24 V
VREF
1.24 V
PWM
Comp.2
PWM
Comp.3
PWM
Comp.4
Threshold voltage
accuracy ±1.5% L priority
L priority
L priority
Threshold voltage
accuracy ±1.5%
Threshold voltage
accuracy ±1.5%
L priority
L priority
L priority
L priority
L priority
Threshold voltage
accuracy ±1.5%
H:
at SCP
H:UVLO
release
Accuracy
±1%
Error Amp Reference
1.24 V
Error Amp Power Supply
SCP Comp. Power Supply
H : ON (Power/ ON)
L : OFF (Standby mode)
VTH = 1.4 V
Short detection
signal
(L: at short)
MB39A103
6
■ABSOLUTE MAXIMUM RATINGS
* : The packages are mounted on the epoxy board (10 cm × 10 cm).
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
■RECOMMENDED OPERATING CONDITIONS
* : See “■ SETTING THE TRIANGULAR OSCILLATION FREQUENCY”.
Note: Pin numbers referred after this part are present on TSSOP-30P PKG.
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the
semiconductor device. All of the device’s electrical characteristics are warranted when the device is
operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation
outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on
the data sheet. Users considering application outside the listed conditions are advised to contact their
FUJITSU representatives beforehand.
Parameter Symbol Condition Rating Unit
Min Max
Power supply voltage VCC VCC, VCCO terminal 12 V
Output current IOOUT1 to OUT4 terminal 20 mA
Peak output current IOP OUT1 to OUT4 terminal
Duty ≤ 5% (t = 1/fOSC×Duty) 400 mA
Power dissipation PDTA ≤ +25 °C (TSSOP-30P) 1390* mW
TA ≤ +25 °C (BCC-32P) 980* mW
Storage temperature TSTG −55 +125 °C
Parameter Symbol Condition Value Unit
Min Typ Max
Start power supply voltage VCC VCC, VCCO terminal (CH4) 1.7 11 V
Power supply voltage VCC VCC, VCCO terminal
(CH1 to CH4) 2.5 4 11 V
Reference voltage output current IREF VREF terminal −10mA
Input voltage VINE −INE1 to −INE4 terminal 0 VCC − 0.9 V
−INS terminal 0 VREF V
VDTC DTC1 to DTC4 terminal 0 VREF V
Control input voltage VCTL CTL terminal 0 11 V
Output current IOOUT1 to OUT4 terminal −15 +15 mA
Oscillation frequency fOSC * 100 500 1500 kHz
Timing capacitor CT39 100 560 pF
Timing resistor RT11 24 130 kΩ
Soft-start capacitor CSCS1 to CS4 0.1 1.0 µF
Short-circuit detection capacitor CSCP 0.1 1.0 µF
Reference voltage output
capacitor CREF 0.1 1.0 µF
Operating ambient temperature TA−30 +25 +85 °C
MB39A103
7
■ ELECTRICAL CHARACTERISTICS (VCC = VCCO = 4 V, TA = +25 °C)
* : Standard design value
(Continued)
Parameter Symbol Pin No Conditions Value Unit
Min Typ Max
1. Reference
voltage
block [Ref]
Output voltage VREF 71.98 2.00 2.02 V
Output voltage
temperature
stability
∆VREF
/VREF 7TA = −30 °C to +85 °C 0.5* %
Input stability Line 7 VCC = 2.5 V to 11 V −10 +10 mV
Load stability Load 7 VREF = 0 mA to −1 mA −10 +10 mV
2.1 Under voltage
lockout protection
circuit block
(CH4) [UVLO1]
Threshold
voltage VTH 22 VCC = 1.4 1.5 1.6 V
Hysteresis
width VH22 0.02 0.05 0.1 V
2.2 Under voltage
lockout protection
circuit block
(CH1 to CH3)
[UVLO2]
Threshold
voltage VTH 25 VCC = 1.7 1.8 1.9 V
Hysteresis
width VH25 0.05 0.1 0.2 V
3. Short-circuit
detection block
[SCP]
Threshold
voltage VTH 11 0.65 0.70 0.75 V
Input source
current ICSCP 11 −1.4 −1.0 −0.6 µA
Reset voltage VRST 25 VREF = 1.3 1.45 1.58 V
4. Triangular
wave oscillator
block [OSC]
Oscillation
frequency fOSC 22, 23, 24, 25 CT = 100 pF, R T = 24 kΩ450 500 550 kHz
Frequency
temperature
stability
∆fOSC/
fOSC 22, 23, 24, 25 TA = −30 °C to +85 °C1* %
5. Soft-
start
block
[CS1 to CS4]
Charge current ICS 1, 15, 16, 30 CS1 to CS4 = 0 V −14 −10 −6µA
6. Error amplifier
block
[Error Amp1 to
Error Amp4]
Threshold
voltage VTH 3, 13, 18, 28 FB1 to FB4 = 0.65 V 1.222 1.240 1.258 V
Input bias
current IB2, 14, 17, 29 −INE1 to −INE4 = 0 V −120 −30 nA
Voltage gain AV3, 13, 18, 28 DC 100* dB
Frequency
bandwidth BW 3, 13, 18, 28 AV = 0 dB 1.6* MHz
MB39A103
8
(Continued)
(VCC = VCCO = 4 V, TA = +25 °C)
*: Standard design value.
Parameter Symbol Pin No Conditions Value Unit
Min Typ Max
6. Error amplifier block
[Error Amp1 to
Error Amp4]
Output voltage VOH 3, 13, 18, 28 1.7 1.9 V
VOL 3, 13, 18, 28 40 200 mV
Output source
current ISOURCE 3, 13, 18, 28 FB1 to FB4 = 0.65 V −2−1mA
Output sink
current ISINK 3, 13, 18, 28 FB1 to FB4 = 0.65 V 150 200 µA
7. PWM
comparator block
[PWM Comp.1 to
PWM Comp.4]
Threshold
voltage
VT0 22, 23, 24, 25 Duty cycle = 0 %0.3 0.4 V
VT100 22, 23, 24, 25 Duty cycle = Dtr 0.9 1.0 V
Input current IDTC 4, 12, 19, 27 DTC = 0.4 V −2.0 −0.6 µA
8. Output block
[Drive1 to Drive4]
Output source
current ISOURCE 22, 23, 24, 25 Duty ≤ 5 %
(t = 1/fOSC×Duty)
OUT1 to OUT4 = 0 V −130 −75 mA
Output sink
current ISINK 22, 23, 24, 25 Duty ≤ 5 %
(t = 1/fOSC×Duty)
OUT1 to OUT4 = 4 V 75 130 mA
Output ON
resistor ROH 22, 23, 24, 25 OUT1 to OUT4 = −15 mA 18 27 Ω
ROL 22, 23, 24, 25 OUT1 to OUT4 = 15 mA 18 27 Ω
9. Short-circuit
detection
comparator block
[SCP Comp.]
Threshold
voltage VTH 25 0.97 1.00 1.03 V
Input bias
current IB20 −INS = 0 V −25 −20 −17 µA
10. Control block
[CTL]
CTL input
voltage VIH 6 IC Active mode 1.7 11 V
VIL 6 IC Standby mode 0 0.8 V
Input current ICTLH 6CTL = 3 V 30 60 µA
ICTLL 6CTL = 0 V 1µA
11. General
Standby
current ICCS 5CTL = 0 V 02µA
ICCSO 26 CTL = 0 V 02µA
Power supply
current ICC 5CTL = 3 V 2.3 4.5 mA
MB39A103
9
■TYPICAL CHARACTERISTICS
(Continued)
TA = +25 °C
CTL = 3 V
5
4
3
2
1
0024681012
TA = +25 °C
CTL = 3 V
VREF= 0 mA
5
4
3
2
1
0024681012
VCC = 4 V
CTL = 3 V
VREF= 0 mA
2.05
2.04
2.03
2.02
2.01
2.00
1.99
1.98
1.97
1.96
1.95
−40 −20 0 20 40 60 80 100
TA = +25 °C
VCC = 4 V
VREF= 0 mA
CTL = 3 V
5
4
3
2
1
0024681012
TA = +25 °C
VCC = 4 V
200
160
120
80
40
0024681012
Power supply current ICC (mA)
Reference voltage VREF (V)
Power Supply Current vs. Power Supply Voltage Reference Voltage vs. Power Supply Voltage
Power supply voltage VCC (V) Power supply voltage VCC (V)
Reference Voltage vs. CTL terminal Voltage
Reference voltage VREF (V)
Ambient temperature TA (°C)
Reference voltage VREF (V)
Reference Voltage vs. Ambient Temperature
CTL terminal voltage VCTL (V)
CTL terminal current ICTL (µA)
CTL terminal Current vs. CTL terminal Voltage
CTL terminal voltage VCTL (V)
MB39A103
10
(Continued)
TA = +25 °C
VCC = 4 V
CTL = 3 V
CT = 39 pF
10000
1000
100
10
CT = 100 pF
CT = 220 pFCT = 560 pF
1 10 100 1000
TA = +25 °C
VCC = 4 V
CTL = 3 V
RT = 11 kΩ
RT = 24 kΩ
RT = 56 kΩRT = 130 kΩ
10000
1000
100
10 10 100 1000 10000
1.2
0 200 400 600 800 1000 1200
0.3
0.2
0.7
0.9
0.4
0.6
0.8
1.0
1.1
0.5
1400 1600
TA = +25 °C
VCC = 4 V
CTL = 3 V
RT = 24 kΩUpper
Lower
VCC = 4 V
CTL = 3 V
RT = 24 kΩ
CT = 100 pF
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
−40 −20 0 20 40 60 80 100
Upper
Lower
VCC = 4 V
CTL = 3 V
RT = 24 kΩ
CT = 100 pF
560
540
520
500
480
460
440
−40 −20 0 20 40 60 80 100
Triangular Wave Upper and Lower Limit Voltage
vs. Ambient Temperature
Triangular wave upper and
lower limit voltage VCT (V)
Ambient temperature TA (°C)
Triangular Wave Oscillation Frequency
vs. Timing Resistor
Triangular wave oscillation
frequency fOSC (kHz)
Timing resistor RT (kΩ)
Triangular Wave Oscillation Frequency
vs. Timing Capacitor
Triangular wave oscillation
frequency fOSC (kHz)
Timing capacitor CT (pF)
Triangular Wave Oscillation Frequency
vs. Ambient Temperature
Triangular wave oscillation
frequency fOSC (kHz)
Ambient temperature TA (°C)
Triangular wave upper and
lower limit voltage VCT (V)
Triangular Wave Upper and Lower Limit Voltage
vs. Triangular Wave Oscillation Frequency
Triangular wave oscillation frequency fOSC (kHz)
MB39A103
11
(Continued)
−
+
+
+29
30 28
1 µF
IN
10 kΩ
2.4 kΩ
2.48 V 240 kΩ
OUT
10 kΩ
1.5 V 1.24 V
40
30
20
10
0
−10
−20
−30
−40
180
90
0
−90
−180
100 1 k 10 k 100 k 1 M 10 M
ϕAV
TA = +25 °C
VCC = 4 V
1600
1400
1200
1000
800
600
400
200
0
1390
−40 −20 0 20 40 60 80 100
1000
800
600
400
200
0
980
−40 −20 0 20 40 60 80 100
Error Amplifier Gain, Phase vs. Frequency
Gain AV (dB)
Phase φ (deg)
Frequency f (Hz)
Power Dissipation vs. Ambient Temperature
(TSSOP-30P)
Power dissipation PD (mW)
Ambient temperature TA (°C)
Power Dissipation vs. Ambient Temperature
(BCC-32P)
Power dissipation PD (mW)
Ambient temperature TA (°C)
Error Amp1
the same as other channels
MB39A103
12
■FUNCTIONS
1. DC/DC Converter Functions
(1) Reference voltage block (Ref)
The reference voltage circuit generates a temperature-compensated reference voltage (2.0 V Typ) from the
v oltage supplied from the power supply terminal (pin 5). The voltage is used as the ref erence v oltage for the IC’ s
internal circuitry.
The ref erence v oltage can supply a load current of up to 1 mA to an external de vice through the VREF terminal
(pin 7).
(2) Triangular-wave oscillator block (OSC)
The triangular wave oscillator incor porates a timing capacitor and a timing resistor connected respectively to
the CT terminal (pin 9) and R T terminal (pin 8) to generate triangular oscillation wav eform amplitude of 0.4 V to
0.9 V.
The triangular waveforms are input to the PWM comparator in the IC.
(3) Error amplifier block (Error Amp1 to Error Amp4)
The error amplifier detects the DC/DC conver ter output voltage and outputs PWM control signals. In addition,
an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the output ter minal to
inverted input terminal of the error amplifier, enabling stable phase compensation to the system.
Also, it is possible to prev ent rush current at pow er supply start-up by connecting a soft-start capacitor with the
CS1 terminal (pin 30) to CS4 terminal (pin 16) which are the non-inv erted input terminal f or Error Amp . The use
of Error Amp for soft-start detection makes it possible for a system to operate on a fixed soft-star t time that is
independent of the output load on the DC/DC converter.
(4) PWM comparator block (PWM Comp.1 to PWM Comp.4)
The PWM comparator is a voltage-to-pulse width modulator that controls the output duty depending on the input/
output voltage.
The output transistor turns on while the error amplifier output voltage and DTC voltage remain higher than the
triangular wave voltage.
(5) Output block (Drive1 to Drive4)
The output block is in the totem pole type, capab le of driving an e xternal P-channel MOS FET (channel 1), and
N-channel MOS FET (channels 2 to 4).
MB39A103
13
2. Channel Control Function
The main or each channel is turned on and off depending on the v oltage le v els at the CTL terminal (pin 6), CS1
terminal (pin 30), CS2 terminal (pin 1), CS3 terminal (pin 15), and CS4 terminal (pin 16).
Channel On/Off Setting Conditions
*: Undefined
3. Protective Functions
(1) Timer-latch short-circuit protection circuit (SCP, SCP Comp.)
The shor t-circuit detection comparator detects the Error Amp output voltage level of each channel, and if any
channel output voltage of Error Amp reaches the short-circuit detection voltage, the timer circuits are actuated
to start charging the external capacitor CSCP connected to the CSCP terminal (pin 11).
When the capacitor (CSCP) v oltage reaches about 0.7 V, the circuit is turned off the output transistor and sets the
dead time to 100 %.
In addition, the shor t-circuit detection from external input is capable by using −INS ter minal (pin 20) on short-
circuit detection comparator (SCP Comp.) .
To release the actuated protection circuit, either the power supply turn off and on again or set the CTL terminal
(pin 6) to the “L” level to lo w er the VREF terminal (pin 7) voltage to 1.3 V (Min) or less. (See “■SETTING TIME
CONSTANT FOR TIMER-LATCH SHORT-CIRCUIT PROTECTION CIRCUIT”.)
(2) Under voltage lockout protection circuit (UVLO)
The transient state or a momentary decrease in supply voltage, which occurs when the power supply is turned
on, may cause the IC to malfunction, resulting in breakdown or degradation of the system. To prevent such
malfunctions, under voltage lockout protection circuit detects a decrease in internal reference voltage with respect
to the power supply voltage, turns off the output transistor, and sets the dead time to 100% while holding the
CSCP terminal (pin 11) at the “L” level.
The circuit restores the output transistor to normal when the supply voltage reaches the threshold v oltage of the
undervoltage lockout protection circuit.
■PROTECTION CIRCUIT OPERATING FUNCTION TABLE
This table refers to output condition when protection circuit is operating.
CTL CS1 CS2 CS3 CS4 Power CH1 CH2 CH3 CH4
L**** OFF OFF OFF OFF OFF
HGNDGNDGNDGND ON OFF OFF OFF OFF
HHigh-Z GND GND GND ON ON OFF OFF OFF
HGNDHigh-Z GND GND ON OFF ON OFF OFF
HGNDGNDHigh-Z GND ON OFF OFF ON OFF
HGNDGNDGNDHigh-Z ON OFF OFF OFF ON
HHigh-Z High-Z High-Z High-Z ON ON ON ON ON
Operating circuit OUT1 OUT2 OUT3 OUT4
Short-circuit protection circuit HLLL
Under voltage lockout protection circuit HLLL
MB39A103
14
■SETTING THE OUTPUT VOLTAGE
■SETTING THE TRIANGULAR OSCILLATION FREQUENCY
The triangular oscillation frequency is determined by the timing capacitor (CT) connected to the CT terminal
(pin 9), and the timing resistor (RT) connected to the RT terminal (pin 8).
Moreov er, it shifts more greatly than the calculated v alues according to the constant of timing resistor (RT) when
the triangular wave oscillation frequency exceeds 1 MHz. Therefore, set it referring to “T riangular Wave Oscillation
Frequency vs. Timing Resistor” and “Triangular Wave Oscillation Frequency vs. Timing Capacitor” in “■ TYPICAL
CHARACTERISTICS”.
Triangular oscillation frequency : fOSC
−
+
+
VO
R1
R2 −INEX
CSX
Error
Amp
1.24 V
VO (V) =(R1 + R2)
1.24
R2
X: Each channel No.
• CH1 to CH4
fOSC (kHz) := 1200000
CT (pF) •RT (kΩ)
MB39A103
15
■SETTING THE SOFT-START TIME
To prevent rush currents when the IC is tur ned on, you can set a soft-star t by connecting soft-star t capacitors
(CS1 to CS4) to the CS1 terminal (pin 30) to the CS4 terminal (pin 16), respectively.
Setting each CTLX from “H” to “L” switches to charge the external soft-start capacitors (CS1 to CS4) connected
to the CS1 to CS4 terminals at 10 µA.
The error amplifier output (FB1 to FB4) is deter mined by comparison between the lower one of the potentials
at two non-in verted input terminals (1.24 V, CS terminal v oltages) and the inv erted input terminal voltage (−INE1
to −INE4).
The FB ter minal voltage during the soft-start period (CS terminal voltage < 1.24 V) is therefore determined by
comparison between the −INE terminal and CS terminal voltages . The DC/DC con v erter output v oltage rises in
proportion to the CS terminal voltage as the soft-start capacitor connected to the CS terminal is charged.
The soft-start time is obtained from the following formula:
Soft-start time: ts (time to output 100%)
ts (s) := 0.124 × CSX (µF)
−
+
+
VO
R1
R2
−INEX
VREF
CSX
CSX
FBX
CTLX
Error Amp
UVLO
1.24 V
10 µA
X: Each channel No.
L priority
CH ON/OFF signal
L: ON, H: OFF
• Soft-Start Circuit
MB39A103
16
■TREATMENT WITHOUT USING CS TERMINAL
When not using the soft-start function, open the CS1 terminal (pin 30), the CS2 terminal (pin 1), the CS3 terminal
(pin 15), the CS4 terminal (pin 16).
1
15
CS2
CS3
30
16
CS1
CS4
“OPEN”
“OPEN”
“OPEN”
“OPEN”
• Without Setting Soft-Start Time
MB39A103
17
■SETTING TIME CONST ANT FOR TIMER-LA TCH SHORT-CIRCUIT PROTECTION CIRCUIT
Each channel uses the short-circuit detection comparator (SCP) to always compare the error amplifier′s output
level to the reference voltage.
While DC/DC conv erter load conditions are stable on all channels , the short-circuit detection comparator output
remains at “L” level, and the CSCP terminal (pin 11) is held at “L” level.
If the load condition on a channel changes rapidly due to a short-circuit of the load, causing the output voltage
to drop, the output of the short-circuit detection comparator on that channel goes to “H” level. This causes the
external short-circuit protection capacitor CSCP connected to the CSCP terminal to be charged at 1 µA.
Short-circuit detection time : tSCP
tSCP (s) := 0.70 × CSCP (µF)
When the capacitor CSCP is charged to the threshold voltage (VTH := 0.70 V), the latch is set and the ex ternal
FET is turned off (dead time is set to 100%). At this time, the latch input is closed and the CSCP terminal
(pin 11) is held at “L” level.
In addition, the short-circuit detection from external input is capable by using −INS terminal (pin 20) on the
short-circuit detection comparator (SCP Comp.). The short-circuit detection operation starts when −INS terminal
voltage is less than threshold voltage (VTH := 1 V).
When the power supply is tur n off and on again or VREF terminal (pin 7) voltage is less than 1.3 V (Min) by
setting CTL terminal (pin 6) to “L” level, the latch is released.
Note : When using self-power supply configuration in which the output from the CH4 DC/DC converter is connected
to the VCC, note that short-circuit detection is not possible in the CH4 DC/DC converter output.
−
+
+
−
+
+
+
VO
R1
R2
−INEX
−INS
CSCP CTL
VREF
SR
CSCP
FBX
SCP
Comp.
SCP
UVLO
Latch
1 V
1.1 V : FB1 to FB3
1.0 V : FB4
−
+
Error
Amp
1.24 V
1 µA
VREF
20
11
X: Each channel No.
To each channel
Drives
• Timer-latch short-circuit protection circuit
MB39A103
18
■TREATMENT WITHOUT USING CSCP TERMINAL
When not using the timer-latch short-circuit protection circuit, connect the CSCP terminal (pin 11) to GND with
the shortest distance.
10
11
GND
CSCP
• Treatment without using CSCP terminal
MB39A103
19
■SETTING THE DEAD TIME
When the device is set for step-up or inver ted output based on the step-up or step-up/down Zeta conversion,
step-up/down Sepic con v ersion or flybac k con version, the FB terminal voltage may reach and exceed the trian-
gular wa v e v oltage due to load fluctuation. If this is the case , the output transistor is fixed to a full-ON state (ON
duty = 100 %). To prevent this, set the maximum duty of the output transistor. To set it, set the voltage at the
DTC terminal by applying a resistive voltage divider to the VREF voltage as shown below.
When the DTC terminal voltage is higher than the triangular wave voltage, the output transistor is tur ned on.
The maximum duty calculation for mula assuming that triangular wave amplitude := 0.5 V and tr iangular wave
lower voltage := 0.4 V is given below.
When the DTC ter minal is not used, connect it directly to the VREF term inal (pin 7) as shown below (when no
dead time is set).
DUTY (ON) Max := Vdt − 0.4 V
0.5 V × 100 (%) , Vdt (V) = Rb
Ra + Rb × VREF
7 VREF
DTCX Ra
Rb Vdt
X: Each channel No.
• When using DTC to set dead time
7 VREF
DTCX
X: Each channel No.
• When no dead time is set
MB39A103
20
■POWERR SUPPLY EXAMPLE USING CH4 FOR SELF-POWER SUPPLY
The MB39A103 can be started with the low input v oltage (VIN ≥ 1.7 V) if the CH4 is used as a self-power supply.
An example of supply the power using the transformer is shown below.
Setting shown in the “■APPLICATION EXAMPLE” is as follows:
• Number of windings for VCC and VCC (O) is set to the value equivalent to VIN + 2.5 V.
CH1 to CH3 are operational on VCC ≥ 2.5 V; in order for the CH1 to CH3 to oper ate on VIN ≥ 1.7 V, the number
of windings should be set equivalent to VIN + 0.8 V or more for VCC and VCC (O).
D
DVO4-1
15 V
VO4-2
5 V
VO4-3
−7.5 V
−
+
+
5
21
22
2
18
16
17
−INE4
VCCO
OUT4
VIN
GNDO
1.24 V
Error
Amp4
VCC
VREF
CS4
FB4
• Power supply example using CH4 for self-power supply
MB39A103
21
■I/O EQUIVALENT CIRCUIT
5
10
+
−7
1.24 V
VREF
VCC
GND
77.3
kΩ
124
kΩ
ESD
protection
element
ESD
protection
element
ESD
protection
element CTL
GND
67
kΩ
104
kΩ
6CSX
GND
VREF
(2.0 V)
RT
GND
VREF
(2.0 V)
8
+
−
0.7 V
CSCP
2 kΩ
GND
VREF
(2.0 V)
11 CT
GND
VREF
(2.0 V)
9
−INEX CSX
GND
VCC
VREF
(2.0 V)
FBX
1.24 V
−INS (1 V)
GND
VCC
100 kΩ
VREF
(2.0 V)
20
DTCX
GND
VCC
FBX CT OUTX
GNDO
VCCO 26
21
X: Each channel No.
〈〈Reference voltage block〉〉 〈〈Control block〉〉 〈〈Soft-start block〉〉
〈〈Short-circuit detection block〉〉 〈〈Triangular wave oscillator
block (RT) 〉〉 〈〈Triangular wave oscillator
block (CT)〉〉
〈〈Error amplifier block (CH1 to CH4) 〉〉 〈〈Short-circuit detection comparator block〉〉
〈〈PWM comparator block (CH1 to CH4) 〉〉 〈〈Output block (CH1 to CH4) 〉〉
MB39A103
22
■APPLICATION EXAMPLE
A
B
C
D
R13R14
3.3 kΩ12 kΩ
R15
C20
0.1 µFC21
0.1 µF
R16
1 kΩ
15 kΩ
R19R20
R25R26
3 kΩ22 kΩ
R21
C22
0.1 µFC23
0.1 µF
R22
1 kΩ
R24 13 kΩ
R30 20 kΩ
15 kΩ
2.4 kΩ43 kΩ
R31R32
2.4 kΩ43 kΩ
R27
C24
0.1 µFC25
0.047 µF
R28
2 kΩ
15 kΩ
R33
C26
0.1 µFC27
0.047 µF
C28
0.01 µF
R34
2 kΩ
15 kΩ
R18 13 kΩ
R17 18 kΩ
V
IN
(1.7 V ∼ 5 V)
R36
20 kΩ
R35
33 kΩ
R29 33 kΩ
−INE1
CS1
FB1
DTC1
−INE2
CS2
FB2
DTC2
−INE3
CS3
FB3
DTC3
−INE4
CS4
−INS
CSCP
FB4
DTC4
CH1
CH2
CH3
CH4
29
30
28
27
2
1
3
4
14
15
13
12
17
16
18
19
20
11
C29
100 pF
R37
24 kΩ
RT CT
8 9
C30
0.1 µF
VREF
7GND
10
Q2 D4
C11
2.2 µF
V
O
4-3
−7.5 V, −5 mA
C10
2.2 µF
5
T2 D2
D3
D8
D
C
C2
0.1 µF
C9
2.2 µF
V
O
4-1
15 V, 10 mA
V
O
4-2
5 V, 50 mA
Q4
T1 D5
D6
C13
1 µFC14
2.2 µF
V
O
3-1
15 V, 10 mA
V
O
3-2
5 V, 50 mA
C15
2.2
µF
C8
1 µF
C32
2.2 µF
VCC
CTL
6
21
22
23
A
Q1
Q5
D1
B
C4
1 µF
C5
4.7 µF
C6
10 µF
V
O
1
2.5 V,
250 mA
D7
C16
4700 pF
C3
4700 pF
C18
4.7
µF
R12
300 Ω
R4
150 Ω
L3
10 µH
L4
15 µH
L1
22
µH
C19
10 µF
C17
1
µF
V
O
2
3.3 V, 500 mA
L2
15 µH
VCCO
24
25
26 V
C1
V
B1
V
C2
V
B2
R23 18 kΩ
C1
0.1
µF
OUT1
OUT2
GNDO
OUT4
OUT3
Charging
current
f
OSC
accuracy
±10%
H : ON (Power ON)
L : OFF (Standby mode)
VTH = 1.4 V
MB39A103
23
■PART S LIST
Note : SANYO : SANYO Electric Co., Ltd.
TDK : TDK Corporation
SUMIDA : SUMIDA Electric Co., Ltd.
ssm : SUSUMU Co., Ltd.
COMPONENT ITEM SPECIFICATION VENDOR PARTS No.
Q1,
Q2, Q4
Q5
PNP Tr
Nch FET
NPN Tr
VCEO = −12 V, IC = −3 A
VDS = 20 V, ID = 1.8 A
VCEO = 15 V, IC = 3 A
SANYO
SANYO
SANYO
CPH3106
MCH3405
CPH3206
D1, D7, D8
D2 to D6 Diode
Diode VF = 0.4 V (Max) , at IF = 1 A
VF = 0.55 V (Max) , at IF = 0.5 A SANYO
SANYO SBS004
SB05-05CP
L1
L2
L3
L4
Inductor
Inductor
Inductor
Inductor
22 µH
15 µH
10 µH
15 µH
0.63 A, 160 mΩ
0.76 A, 120 mΩ
0.94 A, 67 mΩ
0.76 A, 120 mΩ
TDK
TDK
TDK
TDK
RLF5018T-220MR63
RLF5018T-150MR76
RLF5018T-100MR94
RLF5018T-150MR76
T1, T2 Transformer SUMIDA CLQ52 5388-T095
C1, C2
C3, C16
C4, C8, C13
C5, C18
C6, C19
C9 to C11
C13, C17
C14, C15
C20 to C24, C26
C25, C27
C28
C29
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
Ceramics Condenser
0.1 µF
4700 pF
1 µF
4.7 µF
10 µF
2.2 µF
1 µF
2.2 µF
0.1 µF
0.047 µF
0.01 µF
100 pF
50 V
50 V
25 V
10 V
6.3 V
16 V
25 V
16 V
50 V
50 V
50 V
50 V
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
C1608JB1H104K
C1608JB1H472K
C3216JB1E105K
C3216JB1A475M
C3216JB0J106K
C3216JB1C225K
C3216JB1E105K
C3216JB1C225K
C1608JB1H104K
C1608JB1H473K
C1608JB1H103K
C1608CH1H101J
R4
R12
R13
R14
R15, R21, R27
R16, R22
R17
R18
R19
R20
R23
R24
R25, R31
R26
R28, R34
R29, R35
R30, R36
R32
R33
R37
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
150 Ω
300 Ω
3.3 kΩ
12 kΩ
15 kΩ
1 kΩ
18 kΩ
13 kΩ
3 kΩ
22 kΩ
18 kΩ
13 kΩ
2.4 kΩ
43 kΩ
2 kΩ
33 kΩ
20 kΩ
43 kΩ
15 kΩ
24 kΩ
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
ssm
RR0816P-151-D
RR0816P-301-D
RR0816P-332-D
RR0816P-123-D
RR0816P-153-D
RR0816P-102-D
RR0816P-183-D
RR0816P-133-D
RR0816P-302-D
RR0816P-223-D
RR0816P-183-D
RR0816P-133-D
RR0816P-242-D
RR0816P-433-D
RR0816P-202-D
RR0816P-333-D
RR0816P-203-D
RR0816P-433-D
RR0816P-153-D
RR0816P-243-D
MB39A103
24
■REFERENCE DATA
(Continued)
TA = +25 °C
VO1 = 2.5 V, 250 mA
VO2 = 3.3 V, 500 mA
VO3-1 = 15 V, 10 mA
VO3-2 = 5 V, 50 mA
VO4-1 = 15 V, 10 mA
VO4-2 = 5 V, 50 mA
VO4-3 = −7.5 V, −5 mA
fOSC = 500 kHz
100
95
90
85
80
75
70
65
60
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
100
95
90
85
80
75
70
65
601.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
CH2
CH3
CH1
CH4
TA = +25 °C
TOTAL efficiency η (%)
Input voltage VIN (V)
TOTAL Efficiency vs. Input Voltage
Note: Only concerned CH and CH4 (self-power
supply) are ON.
Include external SW Tr operating current
CH4 includes IC current consumption.
Each CH efficiency η (%)
Input voltage VIN (V)
Each CH Efficiency vs. Input Voltage
MB39A103
25
(Continued)
TA = +25 °C
VIN = 3.6 V
100
95
90
85
80
75
70
65
600 50 100 150 200 250 300
CH2, CH3 : OFF
TA = +25 °C
VIN = 3.6 V
100
95
90
85
80
75
70
65
60 0 100 200 300 400 500
CH1, CH3 : OFF
Conversion efficiency η (%)
load current lO2 (mA)
Conversion Efficiency vs. Load Current (CH2)
IO1 ≤ 80 mA: discontinuance mode
Conversion efficiency η (%)
load current IO1 (mA)
Conversion Efficiency vs. Load Current (CH1)
IO1 ≤ 120 mA: discontinuance mode
MB39A103
26
(Continued)
TA = +25 °C
VIN = 3.6 V
VO3-1 = 10 mA
VO4-1 = 10 mA
VO4-3 = −5 mA
100
95
90
85
80
75
70
65
60 0 1020304050
CH1, CH2 : OFF
CH1 to CH3 : OFF
CH3
CH4
Conversion efficiency η (%)
load current IO3-2, IO4-2 (mA)
Conversion Efficiency vs. Load Current (CH3, CH4)
Note: CH3 and CH4 are
discontinuance mode.
MB39A103
27
(Continued)
VB1
6
4
2
0
VC1
t (µs)
TA = +25 °C
VIN = 4 V
CTL = 3 V
5
0
−5
012345678910
VB2 (V)
1
0
−1
−2
VC2 (V)
t (µs)
TA = +25 °C
VIN = 4 V
CTL = 3 V
10
5
0
012345678910
Switching Wave Form (CH1)
Switching Wave Form (CH2)
MB39A103
28
■USAGE PRECAUTION
•
••
• Printed circuit board ground lines should be set up with consideration for common impedance.
•
••
• Take appropriate static electricity measures.
• Containers f or semiconductor materials should ha ve anti-static protection or be made of conductive material.
• After mounting, printed circuit boards should be stored and shipped in conductive bags or containers.
• Work platforms, tools, and instruments should be properly grounded.
• Working personnel should be grounded with resistance of 250 kΩ to 1 MΩ between body and ground.
•
••
• Do not apply negative voltages.
The use of negative voltages below –0.3 V may create parasitic transistors on LSI lines, which can cause
abnormal operation.
■ORDERING INFORMATION
Part number Package Remarks
MB39A103PFT 30-pin plastic TSSOP
(FPT-30P-M04)
MB39A103PV 32-pad plastic BCC
(LCC-32P-M08)
MB39A103
29
■PACKAGE DIMENSIONS
(Continued)
30-pin plastic TSSOP
(FPT-30P-M04)
Dimensions in mm (inches)
C
2001 FUJITSU LIMITED F30007SC-1-1
7.80±0.10(.307±.004)
0.50(.020) 0.20±0.03
(.008±.001)
.173 –.004
+.008
–0.10
+0.20
4.40 6.40±0.10
(.252±.004)
0.10(.004)
7.00(.276) 0.3865(.0152)
0.3865(.0152)
0.90±0.05
(.035±.002)
"A"
0~8°
0.60±0.10
(.024±.004)
0.25(.010)
0.10±0.05
(.004±.002)
1.10(.043)
MAX
Details of "A" part
0.127±0.03
(.005±.001)
INDEX
0.10(.004)
MB39A103
30
(Continued)
32-pad plastic BCC
(LCC-32P-M08)
Dimensions in mm (inches)
C
2001 FUJITSU LIMITED C32060S-c-3-2
0.05(.002)
1
5.00±0.10(.197±.004)
5.00±0.10
(.197±.004)
0.80(.031)MAX
0.075±0.025
(.003±.001)
(Mount height)
(Stand off)
0.50±0.10
(.020±.004)
0.50(.020)TYP
4.20(.165)TYP
3.00(.118)
REF 4.15(.163)
REF
4.20(.165)
TYP 0.50(.020)
TYP
(.020±.004)
0.50±0.10
3.00(.118)REF
4.15(.163)REF
"A" "B""C"
2517
99
1
25 17
0.45±0.06
(.018±.002)
0.45±0.06
(.018±.002)
C0.2(.008)
(.018±.002)
0.45±0.06
(.018±.002)
0.45±0.06
0.40±0.06
(.016±.002)
0.30±0.06
(.012±.002)
Details of "B" part Details of "C" partDetails of "A" part
0.14(.006)
MIN
INDEX AREA
MB39A103
FUJITSU LIMITED
All Rights Reserved.
The contents of this document are subject to change without notice.
Customers are advised to consult with FUJITSU sales
representatives before ordering.
The information and circuit diagrams in this document are
presented as examples of semiconductor device applications, and
are not intended to be incorporated in devices for actual use. Also,
FUJITSU is unable to assume responsibility for infringement of
any patent rights or other rights of third parties arising from the use
of this information or circuit diagrams.
The products described in this document are designed, developed
and manufactured as contemplated for general use, including
without limitation, ordinary industrial use, general office use,
personal use, and household use, but are not designed, developed
and manufactured as contemplated (1) for use accompanying fatal
risks or dangers that, unless extremely high safety is secured, could
have a serious effect to the public, and could lead directly to death,
personal injury, severe physical damage or other loss (i.e., nuclear
reaction control in nuclear facility, aircraft flight control, air traffic
control, mass transport control, medical life support system, missile
launch control in weapon system), or (2) for use requiring
extremely high reliability (i.e., submersible repeater and artificial
satellite).
Please note that Fujitsu will not be liable against you and/or any
third party for any claims or damages arising in connection with
above-mentioned uses of the products.
Any semiconductor devices have an inherent chance of failure. You
must protect against injury, damage or loss from such failures by
incorporating safety design measures into your facility and
equipment such as redundancy, fire protection, and prevention of
over-current levels and other abnormal operating conditions.
If any products described in this document represent goods or
technologies subject to certain restrictions on export under the
Foreign Exchange and Foreign Trade Law of Japan, the prior
authorization by Japanese government will be required for export
of those products from Japan.
F0209
FUJITSU LIMITED Printed in Japan
