AP1501A
150kHz, 5A PWM BUCK DC/DC CONVERTER
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 TO263-5, TO220-5
and TO220-5 (R) packages.
Pin Assignments
(Top View)
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
Metal Tab GND
TO263-5
(Top View)
5 SD
4 FB
3 Gnd
2 Output
1 V
IN
TO220-5/TO220-5 (R)
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
Low power Standby Mode
Built-in Switching Transistor On Chip
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. ‘’Green’’ Devices (Note 3)
Applications
Simple High-efficiency Step-down Regulator
On-card Switching Regulators
Positive to Negative Converter
Notes:
1.
2.
No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free,"Green"
and Lead-free.
Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
3.
AP1501A
Document number: DS31191 Rev. 11 - 2
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December 2017
© Diodes Incorporated
AP1501A
Typical Applications 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
(2) Adjustable Type Circuit
R2
FB
12V
DC Input
Vin
Cin
Capacitor
1
5
SD
4
AP1501A
2
3
Gnd
Output
R1
L1
22uH
5V/ 5A
Output Load
D1
Schottky Diode
Co
Capacitor
V
OUT
= V
FB
(1 +
R1
)
R2
V
FB
= 1.23V
R2 = 1kΩ to 3kΩ
(3) Delay Start Circuit
R2
FB
12V
DC Input
Vin
C
DELAY
0.1uF
1
5
SD
R
DELAY
10K
4
AP1501A
2
3
Gnd
Output
R1
L1
22uH
5V/ 5A
Output Load
Cin
Capacitor
D1
Schottky Diode
Co
Capacitor
AP1501A
Document number: DS31191 Rev. 11 - 2
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December 2017
© Diodes Incorporated
AP1501A
Pin Descriptions
Pin Number
1
2
3
4
5
Pin Name
V
IN
Output
Gnd
FB
SD
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF shutdown
Description
Functional 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
Supply Voltage
SD Pin Input Voltage
FB Pin Voltage
Output Voltage to Ground
Power Dissipation
Storage Temperature
Operating Junction Temperature
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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
°
C
°
C
December 2017
© Diodes Incorporated
AP1501A
Document number: DS31191 Rev. 11 - 2
_
+
Amp
_
Freq.
Compensation
Comp
+
Pre-driver
150kHz
OSC.
Thermal
Shutdown
_
5A
Switch
Output
Gnd
AP1501A
Recommended Operating Conditions
Symbol
V
OP
T
A
Operating Voltage
Operating Ambient Temperature
Parameter
Rating
4.5 to 40
-20 to +85
Unit
V
°
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
= +25°
C.
Symbol
I
FB
f
OSC
Parameter
Feedback Bias Current
Oscillator Frequency
Conditions
V
FB
= 1.3V
(Adjustable version only)
—
I
OUT
= 5A
No outside circuit
V
FB
= 0V force driver on
V
FB
= 0V force driver on
Min
—
127
110
—
—
—
5.5
—
—
—
—
—
2.0
—
—
—
—
—
—
1.3
Typ
40
150
—
1.5
100
0
6.0
—
2
5
150
Max
60
100
173
173
1.6
1.7
—
—
6.5
7.5
200
60
10
250
300
0.6
—
25
5
—
—
—
—
°
C/W
°
C/W
V
A
µA
mA
mA
µA
V
Unit
nA
kHz
V
SAT
Saturation Voltage
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
Current Limit
Output = 0V
Output = -1V
DC
I
CL
I
L
I
Q
I
STBY
V
IL
V
IH
I
H
I
L
θ
JA
θ
JC
Notes:
V
FB
= 12V force driver off
Peak current
No outside circuit
V
FB
= 0 force driver on
No outside circuit
Output Leakage V
FB
= 12V force driver off (Note 4)
Current
V
IN
= 40V
V
FB
= 12V force driver off
SD pin = 5V
V
IN
= 40V
Low (regulator ON)
%
Quiescent Current
Standby Quiescent
Current
SD Pin Logic Input Threshold
Voltage
SD Pin Logic
Input Current
SD Pin Input Current
Thermal Resistance Junction-to-
Ambient
Thermal Resistance
Junction-to-Case
High (regulator OFF)
V
LOGIC
= 2.5V (OFF)
V
LOGIC
= 0.5V (ON)
TO263-5 (Note 5)
TO220-5(R) (Note 5)
TO263-5 (Note 5)
TO220-5(R) (Note 5)
15
0.02
37
31
6
5
µA
4. FB pin removed from output and connected to 0V to force the output transistor switch ON. FB 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.
5. Test condition: Device mounted with copper area of approximately 3inch
2
, 1oz, no air flow.
AP1501A
Document number: DS31191 Rev. 11 - 2
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December 2017
© Diodes Incorporated
AP1501A
Electrical Characteristics
(Cont.)
Specifications with
boldface type
are for full operating temperature range, the other type are for T
J
= +25°
C.
Symbol
Parameter
Conditions
Min
1.193/1.18
—
3.168/3.135
—
4.8/4.75
—
11.52/11.4
—
Typ
1.23
72
3.3
71
5
78
12
88
Max
1.267/1.28
—
3.432/3.465
—
5.2/5.25
—
12.48/12.6
—
Unit
V
%
V
%
V
%
V
%
AP1501A-ADJ
V
FB
AP1501A-3.3V
5V < V
IN
< 40V
Output Feedback 0.2A < I
LOAD
< 5A
V
OUT
programmed for 3V
Efficiency
Output Voltage
Efficiency
Output Voltage
Efficiency
Output Voltage
Efficiency
V
IN
= 12V, I
LOAD
=5A
5.5V < V
IN
< 40V
0.2A < I
LOAD
< 5A
V
IN
= 12V, I
LOAD
= 5A
8V < V
IN
< 40V
0.2A < I
LOAD
< 5A
V
IN
= 12V, I
LOAD
= 5A
15V < V
IN
< 40V
0.2A < I
LOAD
< 5A
V
IN
= 16V, I
LOAD
= 5A
V
OUT
V
OUT
AP1501A-5V
V
OUT
AP1501A-12V
AP1501A
Document number: DS31191 Rev. 11 - 2
5 of 13
www.diodes.com
December 2017
© Diodes Incorporated
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