Advanced Power
Electronics Corp.
FEATURES
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
APE1707
150KHz, 2A PWM BUCK DC/DC CONVERTER
DESCRIPTION
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. If
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
what 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.
TYPICAL APPLICATION
1. ADJUSTABLE OUTPUT VOLTAGE VERSION
VIN=12V
U1
Vcc
SW
C1
470uF
C2
0.1uF
FB
EN
Vss
Vss
Vss
Vss
APE1707
1
L1
47uH
2
Vout=5.0V/2A
R1
4.7K
D1
B340A
C3
470uF
C6
0.1uF
R2
1.5K
Data and specifications subject to change without notice
1
201202162
Advanced Power
Electronics Corp.
ABSOLUTE MAXIMUM RATINGS
(at T
A
=25°C)
Maximum Supply Voltage(V
CC
) -------------------------
+45V
ON/OFF PIN Input Voltage(V
EN
) ------------------------ -0.3V to 40V
Feedback PIN Voltage(V
FB
) ------------------------------ -0.3V to 12V
Output Voltage to Ground(V
OUT
) ------------------------ -0.8V
Power Dissipation(P
D
) ------------------------------------- (T
J
-T
A
)/R
thja
Storage Temperature Range(T
ST
) ---------------------
Operating Junction Temperature Range(T
J
) --------
Operating Supply Voltage(V
OP
)
Thermal Resistance from Junction to Case(R
thjc
)
TO-263-5L
TO-252-5L
SO-8
ESOP-8
Thermal Resistance from Junction to Ambient(R
thja
)
TO-263-5L
TO-252-5L
SO-8
ESOP-8
3.5°C/W
8°C/W
20°C/W
10°C/W
25°C/W
35°C/W
60°C/W
40°C/W
-65°C To 150°C
-20°C To 125°C
+4.5V to +40V
APE1707
Note. R
thja
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, T
A
=25°C, V
CC
=12V for 3.3V, 5V, adjustable version and V
CC
=18V for the 12V version.
I
LOAD
= 0.2A)
Parameter
Quiescent Current
Feedback Bias Current
Shutdown Supply Current
Oscillator Frequency
Oscillator Frequency
Circuit Protect
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
Current Limit
Load Regulation(
△V
OUT
/V
OUT
)
Saturation Voltage
SW Pin=0V
SW Pin=-0.8V
SW Pin Leakage
Current
of
Short
SYM
I
Q
I
FB
I
SD
F
OSC
F
SCP
DC
I
CL
△V
OUT
V
SA T
I
SW L
(Adjustable) When V
FB
<0.5V
(Fixed)When < V
OUT
*40%
V
FB
=0V force driver on
V
FB
=12V force driver off
Pear current, No outside circuit
V
FB
=0V force driver on
I
OUT
= 0.2 to 2A
I
OUT
=2A, No outside circuit
V
FB
=0V force driver on
No outside circuit, VFB=12V force
driver off
V
CC
=40V force driver off
TEST CONDITION
V
FB
=12V force driver off
V
FB
=1.3V
(Adjustable version only)
EN pin=5V
V
CC
=40V
MIN
-
-
-
127
-
-
-
-
2.5
-
-
-
-
TYP
4
-10
100
150
50
50
100
0
-
0.6
1.2
-
-5
MAX
8
-50
200
173
-
-
-
-
-
1.2
1.4
-200
-
UNITS
mA
nA
uA
KHz
KHz
KHz
%
A
%
V
uA
mA
4
FPGA/CPLD
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