AP1501
150Khz, 3A PWM Buck DC/DC Converter
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. A7 Feb. 10, 2004
1/11
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: 3A
- TO220-5L TO220-5L(R) and TO263-5L packages
- Low power standby mode
- Built-in switching transistor on chip
Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
General Description
The AP1501 series are monolithic IC that design for
a step-down DC/DC converter, and own the ability
of driving a 3A 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 AP1501
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.
Pin Assignments
TO220-5L
( Top View )
( Top View )
TO263-5L
1 V
IN
5 SD
4 FB
3 Gnd
2 Output
Metal Tab GND
1 V
IN
5 SD
4 FB
3 Gnd
2 Output
Pin Descriptions
Name
Description
V
IN
Operating voltage input
Output Switching
output
Gnd Ground
FB
Output voltage feedback control
SD ON/OFF
Shutdown
AP1501
150Khz, 3A PWM Buck DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.A7 Feb. 10, 2004
2/11
Ordering Information
Package
T5: TO220-5L
K5: TO263-5L
Output version
AP1501 XX X X X
Packing
Blank : Tube
A : Taping
Blank : Adjustable
-33 : 3.3V
-50 : 5.0V
-12 : 12V
T5R: TO220-5L(R)
Lead Free
Blank : Normal
L : Lead Free Package
Block Diagram
Current
Source
bias
1.235V
Reference
2.5V
Regulator
150kHz
OSC.
Start
up
+
+
_
+
_
Thermal
Limit
Pre-driver
Comp
Comp
Gnd
Output
V
IN
SD
FB
220mV
200mV
3A
Switch
+
_
_
Amp
Comp
Frequecy
compen-
sation
AP1501
150Khz, 3A PWM Buck DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.A7 Feb. 10, 2004
3/11
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
V
CC
Supply
Voltage
+45
V
V
SD
ON/OFF Pin input voltage
-0.3 to +25
V
V
FB
Feedback Pin voltage
-0.3 to +25
V
V
OUT
Output voltage to Ground
-1
V
P
D
Power dissipation
Internally limited
W
T
ST
Storage temperature
-65 to +150
o
C
T
OP
Operating temperature
-40 to +125
o
C
V
OP
Operating voltage
+4.5 to +40
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
Parameter
Conditions
Min.
Typ.
Max.
Unit
60
I
B
Feedback bias current
V
FB
=1.3V
(Adjustable version only)
40
100
nA
127 150 173
F
OSC
oscillator
frequency
110 173
Khz
1.4
V
SAT
saturation
voltage
I
OUT
=3A
no outside circuit
V
FB
=0V force driver on
1.3
1.5
V
Max. Duty Cycle(ON)
V
FB
=0V force driver on
100
DC
Min. Duty cycle(OFF)
V
FB
=12V force driver off
0
%
5.5
I
CL
current
limit
peak current
no outside circuit
V
FB
=0V force driver on
3.6 4.0
6.5
A
Output = 0
no outside circuit
V
FB
=12V force driver off
200
uA
I
L
Output = -1
Output
leakage
current
V
IN
=40V
2
60
mA
I
Q
Quiescent
Current
V
FB
=12V force driver off
5
10
mA
250
I
STBY
Standby Quiescent
Current
ON/OFF pin=5V
V
IN
=40V
150
300
uA
V
IL
Low (regulator ON)
-
0.6
V
IH
ON/OFF pin logic input
threshold voltage
High (regulator OFF)
2.0
1.3
-
V
I
H
ON/OFF pin logic
input current
V
LOGIC
=2.5V (OFF)
15
25
I
L
ON/OFF pin input current V
LOGIC
=0.5V (ON)
0.02
5
uA
TO220-5L
2.5
JC
Thermal Resistance
TO263-5L
Junction to
case
3.5
o
C/W
TO220-5L
28
JA
Thermal Resistance
With copper area of
approximately 3 in
2
TO263-5L
Junction to
ambient
23
o
C/W
AP1501
150Khz, 3A PWM Buck DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.A7 Feb. 10, 2004
4/11
Electrical Characteristics (Continued)
Symbol
Parameter
Conditions
Typ.
Limit
Unit
FB
V
Output
Feedback
4.5V < V
IN
< 40V
0.2A < I
LOAD
< 3A
V
OUT
programmed for
3V
1.23
1.193/1.18
1.267/1.28
V
V
MIN
V
MAX
AP1501-ADJ
Efficiency V
IN
= 12V, I
LOAD
=3A 73
%
OUT
V
Output voltage
4.75V < V
IN
< 40V
0.2A < I
LOAD
< 3A
3.3
3.168/3.135
3.432/3.465
V
V
MIN
V
MAX
AP1501-3.3V
Efficiency V
IN
= 12V, I
LOAD
=3A 73
%
OUT
V
Output voltage
7V < V
IN
< 40V
0.2A < I
LOAD
< 3A
5
4.8/4.75
5.2/5.25
V
V
MIN
V
MAX
AP1501-5V
Efficiency V
IN
= 12V, I
LOAD
=3A 80
%
OUT
V
Output voltage
15V < V
IN
< 40V
0.2A < I
LOAD
< 3A
12
11.52/11.4
12.48/12.6
V
V
MIN
V
MAX
AP1501-12V
Efficiency V
IN
= 15V, I
LOAD
= 3A
90
%
Specifications with boldface type are for full operating temperature range, the other type are for T
J
=25C.
AP1501
150Khz, 3A PWM Buck DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.A7 Feb. 10, 2004
5/11
Typical Performance Characteristics
Typical Performance Characteristics
Normalized Output Voltage
4.90
4.95
5.00
5.05
5.10
-50
-25
0
25
50
75
100
125
OUTPUT VOLTAGE (V)
V
IN
=20V, I
LOAD
=3A
Normalized at T
J
=25
o
C
JUNCTION TEMPERATURE(
o
C)
JUNCTION TEMPERATURE(
o
C)
SWITCH CURRENT LIMIT (A)
Switch Current Limit
0.0
5.0
10.0
15.0
20.0
25.0
-50
-25
0
25
50
75
100
125
JUNCTION TEMPERATURE(
o
C)
SUPPLY CURRENT (mA)
Operating Quiescent Current
JUNCTION TEMPERATURE(
o
C)
EFFICIENCY (%)
Efficiency
100
65
70
75
80
85
90
95
8
10
15
20
25
30
35
40
5V
3.3V
3A Load
0.60
0.80
1.00
1.20
1.40
1.60
0.5
1
2
3
SWITCH CURRENT(A)
SATURATION VOLTAGE (V)
1
2
3
1 : -40
o
C
2 : 25
o
C
3 : 125
o
C
Switch Saturation Voltage
3.50
4.00
4.50
5.00
5.50
-50
-25
0
25
50
75
100 125
V
IN
=12V, V
OUT
=5V
SUPPLY VOLOTAGE (V)
CURRENT (uA)
0.0
40.0
80.0
120.0
160.0
200.0
Shutdown Quiescent Current
10
20
30
40
V
ON/OFF
=5V
1 : -40
o
C
2 : 25
o
C
3 : 125
o
C
1
3
2
Switch ON
Switch OFF
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