AP1501A
150KHz, 5A PWM BUCK DC/DC CONVERTER
Features
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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
Low power standby mode
Built-in switching transistor on chip
Lead Free packages: TO263-5L and TO220-5L(R)
TO263-5L and TO220-5L(R): Available in “Green”
Molding Compound (No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
General Description
The AP1501A series are monolithic ICs that are designed for a
step-down DC/DC converter, and possess the ability to drive 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 includes fixed 3.3V, 5V, 12V, and an
adjustable type. The packages are available in a standard 5-lead
TO263 and TO220 packages.
Applications
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Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
Typical Application Circuit
(1) Fixed Type Circuit
FB
12V
DC Input
Vin
Cin
Capacitor
1
5
SD
4
AP1501A
2
-33
3
Output
L1
18uH
Inductor
D1
Schottky
Diode
3.3V/5A
Output Load
Gnd
Co
Capacitor
AP1501A Rev. 10
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Diodes Incorporated
AP1501A
150KHz, 5A PWM BUCK DC/DC CONVERTER
Typical Application Circuit
(2) Adjustable Type Circuit
R2
(Continued)
R1
FB
12V
DC Input
Vin
Cin
Capacitor
1
5
SD
4
AP1501A
2
3
Gnd
Output
L1
22uH
5V/ 5A
Output Load
D1
Schottky Diode
Co
Capacitor
V
out
= V
FB
×
(1 +
V
FB
= 1.23V
R2 = 1K ~ 3K
R1
R2
)
(3) Delay Start Circuit
R2
FB
12V
DC Input
Vin
Cin
Capacitor
C
DELAY
0.1uF
1
5
SD
R
DELAY
10K
4
AP1501A
2
3
Gnd
D1
Schottky Diode
Co
Capacitor
Output
L1
22uH
5V/ 5A
Output Load
R1
AP1501A Rev. 10
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Diodes Incorporated
AP1501A
150KHz, 5A PWM BUCK DC/DC CONVERTER
Ordering Information
AP1501A - XX XXX X - X
Output Version
Blank : Adjustable
33 : 3.3V
50 : 5.0V
12 : 12V
Package
K5 : TO263-5L
T5 : TO220-5L
T5R : TO220-5L(R)
Lead Free
L : Lead Free
G : Green
Packing
U : Tube
13 : Tape & Reel
Device
Lead-free
Package
Code
K5
K5
K5
K5
T5
T5
T5R
T5R
Packaging
(Note 2)
TO263-5L
TO263-5L
TO263-5L
TO263-5L
TO220-5L
TO220-5L
TO220-5L(R)
TO220-5L(R)
Tube
Quantity Part Number
Suffix
50
NA
50
NA
50
50
50
50
-U
NA
-U
NA
-U
-U
-U
-U
13” Tape and Reel
Quantity
Part Number
Suffix
NA
800/Tape & Reel
NA
800/Tape & Reel
NA
NA
NA
NA
NA
-13
NA
-13
NA
NA
NA
NA
Lead-free
Lead-free
Lead-free
AP1501A-XXK5L-U
AP1501A-XXK5L-13
AP1501A-XXK5G-U
AP1501A-XXK5G-13
AP1501A-XXT5L-U
AP1501A-XXT5G-U
AP1501A-XXT5RL-U
AP1501A-XXT5RG-U
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
Pin Assignments
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
Metal Tab GND
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
TO220-5L/TO220-5L(R)
TO263-5L
AP1501A Rev. 10
DS31191
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Diodes Incorporated
AP1501A
150KHz, 5A PWM BUCK DC/DC CONVERTER
Pin Descriptions
Name
V
IN
Output
Gnd
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF shutdown
Block Diagram
SD
V
IN
200mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
Start
up
220mV
+
Comp
_
Comp
+
FB
AP1501A Rev. 10
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_
+
Amp
_
Freq.
Compensation
Comp
+
Pre-driver
150kHz
OSC.
Thermal
Shutdown
_
5A
Switch
Output
Gnd
SEPTEMBER 2009
©
Diodes Incorporated
AP1501A
150KHz, 5A PWM BUCK DC/DC CONVERTER
Absolute Maximum Ratings
Symbol
ESD MM
V
CC
V
SD
V
FB
V
OUT
P
D
T
ST
T
J
Supply Voltage
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating Junction Temperature
Parameter
Machine Model ESD Protection
Rating
400
+45
-0.3 to +40
-0.3 to +40
-1
Internally limited
-65 to +150
-20 to +125
Unit
V
V
V
V
V
W
o
o
C
C
Recommended Operating Conditions
Symbol
V
OP
T
A
Parameter
Operating voltage
Operating Ambient Temperature
Rating
4.5 to 40
-20 to 85
Units
V
o
C
AP1501A Rev. 10
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SEPTEMBER 2009
©
Diodes Incorporated
