Advanced Power
Electronics Corp. APE1707
FEATURES DESCRIPTION
Output Voltage : 3.3V, 5V, 12V and Adjustable
Output Voltage
Adjustable Version Output Voltage Range, 1.23V
to 38.5V
150KHz Fixed Switching Frequency.
Voltage Mode Non-synchronous PWM Control.
Thermal-shutdown and Current-limit Protection.
ON/OFF Shutdown Control Input.
Short Circuit Protect(SCP)
Operating Voltage can be up to 40V
Output Load Current 2A
SO-8, ESOP-8, TO-263-5L and TO-252-5L
Pb-Free & Halogen Free Packages.
Low Power Standby Mode.
Built-in Switching Transistor on Chip
1. ADJUSTABLE OUTPUT VOLTAGE VERSION
Data and specifications subject to change without notice
201202162
TYPICAL APPLICATION
1
150KHz, 2A PWM BUCK DC/DC CONVERTER
The APE1707 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of driving a
2A load without additional transistor. It saves board space.
The external shutdown function can be controlled by logic
level and then come into standby mode. The internal
compensation makes feedback control having good line
and load regulation without external design. Regarding
protected function, thermal shutdown is to prevent over
temperature operating from damage, and current limit is
against over current operating of the output switch. I
f
current limit function occurs and VFB is down below 0.5V,
the switching frequency will be reduced.
The APE1707 series operates at a switching frequency
of 150KHz thus allow smaller sized filter components than
wha
t
would be needed with lower frequency switching
regulators. The output version included fixed 3.3V, 5V, 12V,
and an adjustable type. The chips are available in SO-8,
ESOP-8, TO-263-5L and TO-252-5L packages.
C2
0.1uF
D1
B340A
L1
47uH
1 2
C3
470uF
C1
470uF
U1
APE1707
Vcc
SW
FB
EN Vss
Vss
Vss
Vss
VIN=12V
C6
0.1uF R2
1.5K
R1
4.7K
Vout=5.0V/2A
Advanced Power
Electronics Corp. APE1707
TYPICAL APPLICATION
2. ADJUSTABLE OUTPUT VOLTAGE VERSION WITH DELAYED STARTUP
Table 1 Resistor select for output voltage setting
3. FIXED OUTPUT VOLTAGE VERSION
2
C2
0.1uF
D1
B240A
L1
33uH
1 2
C3
470uF
C1
470uF
U1
APE1707
Vcc
SW
FB
EN Vss
Vss
Vss
Vss
Vout=2.5V/2A
VIN=12V
ON/OFF
C6
0.1uF R2
1.8K
R1
1.8K
C4
0.1uF
R3
100k
VOUT = VFB x (1 + R1/R2 ), VFB = 1.23V, R2 = 0.47K ~ 3K
V
OUT
R2 R1
1.5K 4.7K
1.8K 5.6K
1.5K 2.5K
1.8K 3.0K
2.5V 1.8K 1.8K
1.8V 1.8K 0.82K
5V
3.3V
V
OUT
2.5V 3.3V 5V 12V
V
IN
=12V 33uH 33uH 47uH NA
V
IN
=24V 33uH 33uH 47uH 68uH
L1 rec om mend value (I
OUT
=2A,)
C1
470uF
Vout=3.3V/2AVIN=12~24V
C2
0.1uF
D1
B340A
L1
33uH
1 2
C3
470uF
U1
APE1707-33
Vcc
SW
FB
EN Vss
Vss
Vss
Vss
C6
0.1uF
Advanced Power
Electronics Corp. APE1707
TYPICAL APPLICATION
4. INVERTING -5V REGULATOR WITH DELAYED STARTUP
ORDERING / PACKAGE INFORMATION
3
IN5400
220uF 0.1uF 3A/20V
VIN=5~20V
APE1707-50
Vcc
SW
FB
EN Vss
Vss
Vss
Vss 100uF
0.1uF
100k
2A/30V
220uF
33uH
0.1uF
VOUT
-5V200mA
TO-252-5L (Side View)
1Vcc
4FB
3Vss
2SW
5EN
(Top View)
Metal
Tab
Vss
(Top View)
1
2
3
4
8
7
6
5
FB
EN
VCC
SW
VSS
SO-8
VSS
VSS
VSS
(Top View)
1
2
3
4
8
7
6
5
FB
EN
VCC
SW
VSS
ESOP-8
VSS
VSS
VSS
VSS
TO-2 63-5L (Side View)
( Top View ) 1V
CC
5EN
4FB
3V
SS
2SW
Metal
Tab
Vss
APE1707X-XX-HF
Package Type
M : SO-8
MP : ESOP -8
H : TO-252-5L
S : TO-263-5L
33:3.3V
50:5.0V
12: 12V
Blank:ADJ
Output Voltage
Halogen Free
Advanced Power
Electronics Corp. APE1707
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
Maximum Supply Voltage(VCC) ------------------------- +45V
ON/OFF PIN Input Voltage(VEN) -----------------------
-
-0.3V to 40V
Feedback PIN Voltage(VFB) -----------------------------
-
-0.3V to 12V
Output Voltage to Ground(VOUT) -----------------------
-
-0.8V
Power Dissipation(PD) ------------------------------------
-
(TJ-TA)/Rthja
Storage Temperature Range(TST) --------------------- -65°C To 150°C
Operating Junction Temperature Range(TJ) -------
-
-20°C To 125°C
Operating Supply Voltage(VOP) +4.5V to +40V
Thermal Resistance from Junction to Case(Rthjc)
TO-263-5L 3.5°C/W
TO-252-5L 8°C/W
SO-8 20°C/W
ESOP-8 10°C/W
TO-263-5L 25°C/W
TO-252-5L 35°C/W
SO-8 60°C/W
ESOP-8 40°C/W
Note. Rthja is measured with the PCB copper area(need connect to VSS pins) of approximately 1.5 in 2 (Multi-layer).
ELECTRICAL SPECIFICATIONS
(Unless otherwise specified, TA=25°C, VCC=12V for 3.3V, 5V, adjustable version and VCC=18V for the 12V version.
ILOAD = 0.2A)
Parameter SYM TEST CONDITION MIN TYP MAX UNITS
Quiescent Current IQVFB=12V force driver off -48mA
VFB=1.3V
(Adjustable version only)
EN pin=5V
VCC=40V
Oscillator Frequency FOSC 127 150 173 KHz
(Adjustable) When VFB<0.5V - 50 - KHz
(Fixed)When < VOUT*40% - 50 - KHz
Max. Duty Cycle (ON) VFB=0V force driver on - 100 -
Min. Duty Cycle (OFF) VFB=12V force driver off -0-
Pear current, No outside circuit
V FB=0V force driver on
Load Regulation( △VOUT/VOUT ) △VOUT IOUT = 0.2 to 2A - 0.6 1.2 %
IOUT=2A, No outside circuit
VFB=0V force driver on
SW Pin=0V No outside circuit, VFB=12
V
force
driver off - - -200 uA
SW Pin=-0.8V VCC=40V force driver off --5-mA
ISW L
Saturation Voltage VSA T - 1.2 1.4 V
2.5 -
DC %
A
ICL
100 200 uA
Oscillator Frequency of Short
Circuit Protect FSCP
- -10 -50
4
Thermal Resistance from Junction to Ambient(Rthja)
Feedback Bias Current IFB nA
Shutdown Supply Current ISD
-Current Limit
-
SW Pin Leakage
Current
Advanced Power
Electronics Corp. APE1707
ELECTRICAL SPECIFICATIONS(Cont.)
Parameter SYM TEST CONDITION MIN TYP MAX UNITS
VIL Low (regulator ON) - 0.6
VIH High (regulator OFF) 2 -
EN Pin Logic Input Current IHVEN=2.5V (OFF) - -0.1 -10
EN Pin Input Current ILVEN=0.5V (ON) - -0.01 -1
Thermal Shutdown Temp TSD - 135 - °C
Version Characteristics Symbol Conditions MIN TYP MAX UNITS
ILOAD =0.2A
VOUT programmed for 3.3V
ηVCC=12V, ILOAD=2A - 79 - %
VOUT ILOAD =0.2A 3.2 3.3 3.4 V
ηVCC=12V, ILOAD=2A - 80 - %
VOUT ILOAD =0.2A 4.85 5.0 5.15 V
ηVCC=12V, ILOAD=2A - 84 - %
VOUT ILOAD =0.2A 11.64 12 12.36 V
ηVCC=15V, ILOAD=2A - 90 - %
PIN DESCRIPTIONS
PIN SYMBOL PIN DESCRIPTION
VSS GND pin
FB Output voltage feedback control
EN ON/OFF shutdown
SW Switching output
VCC Operating voltage input
BLOCK DIAGRAM
APE1707-5.0V
VFB
APE1707-ADJ 1.193
uA
EN Pin Logic Input Threshold
Voltage 1.3 V
5
APE1707-3.3V
APE1707-12V
1.23 1.267 V
Output Feedback
Voltage
Efficiency
Efficiency
Efficiency
Efficiency
Output Voltage
Output Voltage
Output Voltage
150kHz
OSC.
START
UP
+
+
_
+
_
Thermal
Shutdown
CONT ROL
+
DRIVER
COMP.
COMP.
Vss
SW
EN
FB
200mV
220mV
2A
SWITCH
_
COMP.
V
CC
Current
limit
+
_AMP
COMP.
CURRENT
SOURCE
BIAS
1.235V
REFERENCE 2.5V
REGULATOR
R2
R1
ADJ : R2=0 Ω, R1 =O PEN
Advanced Power
Electronics Corp. APE1707
FUNCTION DESCRIPTION
PIN FUNCTION
VCC
VSS
SW
FEEDBACK
EN
THERMAL CONSIDERATIONS
6
This is the positive input supply for the IC switching regulator. A suitable input
bypass capacitor must be presented at this pin to minimize voltage transients and to
supply the switching currents needed by the regulator.
Circuit
g
round.
Internal switch. The voltage at this pin switches between (+VCC –V
SAT) and
approximately – 0.5V, with a duty cycle of approximately VOUT /V
CC. To minimize
coupling to sensitive circuitry, the PC board copper area connected to this pin should
Senses the regulated output voltage to complete the feedback loop.
Allows the switching regulator circuit to be shutdown using logic level signals
thus dropping the total input supply current to approximately 100uA. Pulling this pin
below a threshold voltage of approximately 1.3V turns the regulator on, and pulling
this pin above 1.3V (up to a maximum of VCC) shuts the regulator down. If this
shutdown feature is not needed, the EN pin can be wired to the ground pin.
The SO-8 package needs a heat sink under most conditions. The size of the
heat sink depends on the input voltage, the output voltage, the load current and the
ambient temperature. The APE1707 junction temperature rises above ambient
temperature for a 2A load and different input and output voltages.
The data for these curves was taken with the APE1707 (SO-8 package)
operating as a buck-switching regulator in an ambient temperature of 25℃(still air).
These temperature increments are all approximate and are affected by many factors.
Higher ambient temperatures require more heat sinker.
For the best thermal performance, wide copper traces and generous amounts o
f
printed circuit board copper (need connect to the VSS pins) should be used in the
board layout, (One exception is the SW(switch) pin, which should not have large
areas of copper.) Large areas of copper provide the best transfer of heat (lowe
r
thermal resistance) to the surrounding air, and moving air lowers the thermal
resistance even further.
Advanced Power
Electronics Corp. APE1707
7
Package thermal resistance and junction temperature increments are all
approximate. The increments are affected by a lot of factors. Some of these factors
include board size, shape, thickness, position, location, and even board temperature.
Other factors are, trace width, total printed circuit copper area, copper thickness,
single or double-sided, multi-layer board and the amount of solder on the board.
The effectiveness of the PC board to dissipate heat also depends on the size,
quantity and spacing of other components on the board, as well as whether the
surrounding air is still or moving. Furthermore, some of these components such as
the catch diode will add heat to the PC board and the heat can vary as the input
voltage changes. For the inductor, depending on the physical size, type of core
material and the DC resistance, it could either act as a heat sink taking heat away
from the board, or it could add heat to the board.
Advanced Power
Electronics Corp. APE1707
TYPICAL PERFORMANCE CHARACTERISTICS
EN on Test Wave
(VIN=12V, VOUT=5V, IOUT=2A )
Efficiency
(VIN=12V, VOUT=3.3V) Efficiency
(VIN=12V, VOUT=5.0V)
8
(VIN=12V, VOUT=3.3V, IOUT=2A)
Output Ripple Power on Test Wave
(VIN=12V, VOUT=5V, IOUT=2A )
Load Transient Response
(VIN=12V, VOUT=3.3V, IOUT=0.1~2A)
Vin=12V
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
0.0 0.5 1.0 1.5 2.0
Iout(A)
Efficiency(%)
Vin=12V
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
0.0 0.5 1.0 1.5 2.0
Iout(A)
Efficiency(%)
Advanced Power
Electronics Corp. APE1707
MARKING INFORMATION
TO-252-5L
TO-263-5L
SO-8 / ESOP-8
9
1707H-XX
YWWSSS
Part Number
Package Code
Output Voltage :
Blank : Adj ; 50 : 5.0V
33 : 3.3V ; 12 : 12V
Logo
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
Logo
Part Number
Package Code
Output Voltage :
Blank : Adj ; 50 : 5.0V
33 : 3.3V ; 12 : 12V
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
1707S - XX
YWWSSS
1707X-&&
YWWSSS
Part Number
Package Code :
M : SO-8 ; MP : ESOP-8
Output Voltage :
Blank : Adj ; 50 : 5.0V
33 : 3.3V ; 12 : 12V
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence