AP1501A
150Khz, 5A PWM Buck DC/DC Converter
Features
-
Output voltage: 3.3V, 5V, 12V and adjustable
output version
-
Adjustable version output voltage range, 1.23V to
37V+4%
-
150Khz +15% fixed switching frequency
-
Voltage mode non-synchronous PWM control
-
Thermal-shutdown and current-limit protection
-
ON/OFF shutdown control input
-
Operating voltage can be up to 40V
-
Output load current: 5A
-
TO220-5L, TO220-5L(R) and TO263-5L packages
-
Low power standby mode
-
Built-in switching transistor on chip
General Description
The AP1501A series are monolithic IC that design
for a step-down DC/DC converter, and own the
ability of driving a 5A load without additional
transistor component. Due to reducing the number
of external component, the board space can be
saved easily. The external shutdown function can
be controlled by logic level and then come into
standby mode. The internal compensation makes
feedback control have 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. The AP1501A series operates at a
switching frequency of 150Khz thus allowing
smaller sized filter components than what would be
needed with lower frequency switching regulators.
Other features include a guaranteed +4% tolerance
on output voltage under specified input voltage and
output load conditions, and +15% on the oscillator
frequency. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The packages are
available in a standard 5-lead TO-220 package and
a 5-lead TO-263.
Applications
-
Simple High-efficiency step-down regulator
-
On-card switching regulators
-
Positive to negative converter
Pin Assignments
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
Pin Descriptions
Name
V
IN
Output
Gnd
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF shutdown
Metal Tab GND
TO263-5L
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
TO220-5L/TO220-5L(R)
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.2 Aug 23, 2005
1/12
AP1501A
150Khz, 5A PWM Buck DC/DC Converter
Absolute Maximum Ratings
Symbol
V
CC
V
SD
V
FB
V
OUT
P
D
T
ST
T
OP
V
OP
Parameter
Supply Voltage
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
Rating
+45
-0.3 to +40
-0.3 to +40
-1
Internally limited
-65 to +150
-40 to +125
+4.5 to +40
Unit
V
V
V
V
W
o
o
C
C
V
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, V
IN
=12V for 3.3V, 5V, adjustable version and V
IN
=24V for the 12V version. I
LOAD
= 0.5A
Symbol
I
FB
F
OSC
V
SAT
DC
I
CL
I
L
I
Q
I
STBY
V
IL
V
IH
I
H
I
L
θ
JC
θ
JA
Parameter
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max. Duty Cycle(ON)
Min. Duty Cycle(OFF)
Current Limit
Output
Leakage
Output =-1V Current
Quiescent Current
Standby Quiescent
Current
Output = 0V
ON/OFF Pin Logic Input
Threshold Voltage
ON/OFF Pin Logic
Input Current
ON/OFF Pin Input
Current
Thermal Resistance
Thermal Resistance
with Copper Area of
Approximately 3 in
2
Conditions
V
FB
=1.3V
(Adjustable version only)
Min.
Typ.
40
127
110
I
OUT
=5A
no outside circuit
V
FB
=0V force driver on
V
FB
=0V force driver on
V
FB
=12V force driver off
peak current
no outside circuit
V
FB
=0 force driver on
no outside circuit
V
FB
=12 force driver off
V
IN
=40V
V
FB
=12 force driver off
ON/OFF pin=5V
V
IN
=40V
Low (regulator ON)
High (regulator OFF)
V
LOGIC
=2.5V (OFF)
V
LOGIC
=0.5V (ON)
TO220-5L
TO263-5L
TO220-5L
TO263-5L
Junction to
Case
Junction to
Ambient
150
1.5
100
0
Max.
60
100
173
173
1.6
1.7
Unit
nA
Khz
V
%
6.5
5.5
6.0
7.5
200
2
5
150
2.0
1.3
15
0.02
2.5
3.5
28
23
25
uA
5
o
A
uA
mA
mA
uA
V
60
10
250
300
0.6
C/W
C/W
o
Anachip Corp.
www.anachip.com.tw
3/12
Rev.1.2 Aug 23, 2005
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