AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Description
The AP1507 is a monolithic IC designed for a step-down DC/DC
converter and is capable of driving a 3A load without an external
transistor. Due to reducing the number of external components, 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 the feedback control have good
line and load regulation without an external design. Regarding the
protected function, the thermal shutdown is to prevent over
temperature operating from damaging the device, and current limit is
against over current operating of the output switch. If the current limit
function occurred and V
FB
is down to 0.5V below, the switching
frequency will be reduced. The AP1507 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 a fixed 3.3V, 5V, 12V, and an adjustable type.
AP1507 is available in a 5-lead TO-252 lead-free or green package.
Pin Assignments
(Top View)
5 SD
4 FB
3 GND
2 Output
1 V
IN
Metal Tab GND
TO252-5L
Features
•
•
•
•
•
•
•
•
•
•
•
Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version
Adjustable Version Output Voltage Range, 1.23V to 18V +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 22V
Output Load Current: 3A
Low Power Standby Mode
Built-in Switching Transistor On Chip
AP1507-XXD5L-XX
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
•
AP1507-XXD5-XX
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
•
•
•
Simple High-Efficiency Step-Down Regulator
On-Card Switching Regulators
Positive to Negative Converter
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
AP1507
Document number: DS31067 Rev. 3 - 2
1 of 12
www.diodes.com
May 2012
© Diodes Incorporated
AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Absolute Maximum Ratings
(T
A
= 25°C) (Note4)
Symbol
ESD HBM
ESD MM
V
CC
V
SD
V
FB
V
OUT
P
D
T
ST
T
J
Note:
Parameter
Human Body Model ESD Protection
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
Rating
2
200
+24
-0.3 to +18
-0.3 to +18
-1
Internally Limited
-65 to +150
-40 to +125
Unit
KV
V
V
V
V
V
W
o
o
C
C
4. Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings
only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device
reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time.
Recommended Operating Conditions
(T
A
= 25°C)
Symbol
I
OUT
V
OP
T
A
Output Current
Operating Voltage
Operating Ambient Temperature
Parameter
Min
0
4.5
-20
Max
3
22
+85
Unit
A
V
o
C
AP1507
Document number: DS31067 Rev. 3 - 2
4 of 12
www.diodes.com
May 2012
© Diodes Incorporated
AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Electrical Characteristics
(All Output Voltage Versions)
Unless otherwise specified, V
IN
= 12V for 3.3V, 5V, adjustable version and V
IN
= 18V 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
Parameter
Feedback Bias Current
V
FB
= 1.3V
( Adjustable Version Only )
127
110
When current limit Occurred and
o
V
FB
< 0.5V, T
A
= 25 C
I
OUT
= 3A
V
SAT
Saturation Voltage
No Outside Circuit
V
FB
= 0V Force Driver On
DC
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
V
FB
= 0V Force Driver On
V
FB
= 12V Force Driver Off
Peak Current
I
CL
Current Limit
No Outside Circuit
V
FB
= 0V Force Driver On
Output = 0V
Output = -1V
I
Q
I
STBY
V
IL
V
IH
I
H
I
L
θ
JA
θ
JC
Quiescent Current
Standby Quiescent
Current
Output
leakage
current
No Outside Circuit
V
FB
=12V Force Driver Off
V
IN
= 22V
V
FB
= 12V Force Driver Off
ON/OFF Pin = 5V
V
IN
= 22V
-
2.0
-5
5
70
10
150
200
0.6
-
-0.01
-0.1
10
50
-1
o
Conditions
Min
Typ
-10
150
Max
-50
-100
173
173
Unit
nA
F
OSC
F
SCP
Oscillator Frequency
Oscillator Frequency of Short
Circuit Protect
KHz
10
30
50
1.6
KHz
1.4
1.7
V
100
0
5.5
3.6
4.5
6.5
-200
%
A
I
LEAK
µA
mA
mA
µA
ON/OFF Pin Logic Input Threshold Low (Regulator ON)
Voltage
ON/OFF Pin Logic Input Current
ON/OFF Pin Input Current
Thermal Resistance
Thermal Resistance
with copper area of approximately TO252-5L
2cm ×2cm
High (Regulator OFF)
V
LOGIC
= 2.5V (OFF)
V
LOGIC
= 0.5V (ON)
TO252-5L
Junction to Case
Junction to
Ambient
1.3
V
µA
C/W
C/W
o
AP1507
Document number: DS31067 Rev. 3 - 2
5 of 12
www.diodes.com
May 2012
© Diodes Incorporated
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