AP1501
150KHz, 3A 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: 3A
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 AP1501 is a fully integrated step-down DC/DC converter,
with the ability to drive 3A load without the need of additional
driver components. The AP1501 operates at a switching
frequency of 150KHZ enabling the use of small size filter
components. As a result, board space is reduced and BOM costs
are lowered.
The AP1501 has integrated the shutdown function that allows
standby mode to be activated via an external logic signal input.
The internal compensation facilitates feedback control for line
and load regulation without the need of an external circuitry. The
AP1501 has a built-in Thermal shutdown and Current Limit
function to prevent damage from high operating temperature and
high current operating to the output switch.
Additional features include a guaranteed +/- 4% tolerance on the
output voltage under specified input and output load conditions,
and +/- 15% on oscillator frequency. The AP1501 offers both
fixed and a Adjustable output voltages. For fixed outputs the
AP1501 supports 3.3V, 5.0V and 12V. The package options
available are standard 5-lead TO263 and TO220(R) packages.
Applications
•
•
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Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
Ordering Information
AP1501 - 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
AP1501-XXK5L-U
AP1501-XXK5L-13
AP1501-XXK5G-U
AP1501-XXK5G-13
AP1501-XXT5L-U
AP1501-XXT5G-U
AP1501-XXT5RL-U
AP1501-XXT5RG-U
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see
EU Directive 2002/95/EC Annex Notes.
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..
AP1501 Rev. 11
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JANUARY 2009
©
Diodes Incorporated
AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
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
Pin Descriptions
Name
V
IN
Output
Gnd
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF shutdown
AP1501 Rev. 11
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Diodes Incorporated
AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Block Diagram
SD
V
IN
200mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
Start
up
220mV
+
Comp
_
Comp
+
FB
Absolute Maximum Ratings
Symbol
ESD MM
V
CC
V
SD
V
FB
V
OUT
P
D
T
ST
T
J
T
MJ
Parameter
Machine Model ESD Protection
Supply Voltage
ON/OFF Pin input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
Storage Temperature
Operating Junction Temperature
Maximum Junction Temperature
AP1501 Rev. 11
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_
+
Amp
_
Frequency
compen-
sation
Comp
+
Pre-driver
150kHz
OSC.
Thermal
Shutdown
_
3A
Switch
Output
Gnd
Rating
400
+45
-0.3 to +40
-0.3 to +40
-1
Internally limited
-65 to +150
-20 to +125
150
Unit
V
V
V
V
V
W
o
o
o
C
C
C
JANUARY 2009
©
Diodes Incorporated
AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Recommended Operating Conditions
Symbol
V
OP
T
A
Operating Voltage
Operating Ambient Temperature
Parameter
Rating
4.5 to 40
-20 to 85
Units
V
o
C
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
Specifications with
boldface type
are for full operating temperature range, the other type are for T
J
= 25ºC.
Symbol
I
FB
F
OSC
V
SAT
DC
I
CL
Parameter
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max. Duty Cycle(ON)
Min. Duty cycle(OFF)
Current Limit
Output = 0
Output
Leakage
Output = -1 Current
Quiescent Current
Standby Quiescent
Current
Conditions
V
FB
= 1.3V
(Adjustable version only)
Min
Typ.
40
127
110
I
OUT
= 3A
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
= 0V force driver on
No outside circuit
V
FB
= 12V force driver off (Note 3)
V
IN
= 40V
V
FB
= 12V force driver off
ON/OFF pin = 5V
V
IN
= 40V
Low (regulator ON)
150
Max
60
100
173
173
1.4
1.5
Unit
nA
KHZ
V
%
1.3
100
0
5.5
3.6
4.0
6.5
200
2
5
150
1.3
15
0.02
37
31
6
o
A
uA
mA
mA
uA
V
I
L
I
Q
I
STBY
V
IL
V
IH
I
H
I
L
θ
JA
ON/OFF pin Logic Input
Threshold Voltage
High (regulator OFF)
ON/OFF Pin Logic
Input Current
ON/OFF Pin Input
Current
Thermal Resistance
unction to Ambient
V
LOGIC
= 2.5V (OFF)
V
LOGIC
= 0.5V (ON)
TO263-5L (Note 4)
60
10
250
350
0.6
2.0
25
uA
5
o
C/W
TO220-5L(R) (Note 4)
TO263-5L (Note 4)
TO220-5L(R) (Note 4)
θ
JC
Thermal Resistance
Junction to Case
C/W
5
Notes:
3. Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Feedback pin removed from output and
connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor switch OFF.
4. Test condition: Device mounted with copper area of approximately 3 in
2
,1oz, no air flow.
AP1501 Rev. 11
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Diodes Incorporated
AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Electrical Characteristics
(Continued)
Specifications with
boldface type
are for full operating temperature range, the other type are for T
J
= 25ºC.
Symbol
V
FB
Parameter
Output
Feedback
Efficiency
Output Voltage
Efficiency
Output Voltage
Efficiency
Output Voltage
Efficiency
Conditions
V
Min
Typ.
V
Max
1.267
1.28
Unit
V
AP1501-ADJ
4.5V < V
IN
< 40V
1.193
0.2A < I
LOAD
< 3A
1.18
V
OUT
programmed for 3V
V
IN
= 12V, I
LOAD
= 3A
4.75V < V
IN
< 40V
0.2A < I
LOAD
< 3A
V
IN
= 12V, I
LOAD
= 3A
7V < V
IN
< 40V
0.2A < I
LOAD
< 3A
V
IN
= 12V, I
LOAD
= 3A
15V < V
IN
< 40V
0.2A < I
LOAD
< 3A
V
IN
= 15V, I
LOAD
= 3A
11.52
11.4
4.8
4.75
3.168
3.135
1.23
η
V
OUT
73
3.3
73
5
80
12
90
12.48
12.6
5.2
5.25
3.432
3.465
%
V
%
V
%
V
%
AP1501-3.3V
η
V
OUT
AP1501-5V
η
V
OUT
AP1501-12V
η
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Diodes Incorporated
