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AP1512 (Diodes) : Total 12 Pages

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AP1512/A
50KHz, 2A/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%
50KHz +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 60V
Output load current: 2A (for AP1512)
3A (for AP1512A)
Low power standby mode
Built-in switching transistor on chip
Lead Free Finish/ RoHS Compliant (Note 1)
General Description
The AP1512/A is a monolithic IC designed for use as a
step-down DC/DC converter with the ability of driving a 2A (3A for
AP1512A) load without additional transistor components. The
board space is reduced since AP1512/A requires few external
components. The external shutdown function is controlled by
logic level and can be put into standby mode. The internal
compensation ensures feedback control has good line and load
regulation without external design. Both an integrated Thermal
shutdown and Current Limit function are provided to prevent
damage from exceeding temperature operation and against
exceeding the current operating of the output switch. The
AP1512/A operates at a switching frequency of 50KHz 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%
tolerance on the oscillator frequency. The AP1512/A offers fixed
output voltages of 3.3V, 5V, 12V, plus Adjustable. The package is
available in a standard 5-lead TO263 package.
Applications
Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
Ordering Information
AP1512 X - XX XX X X
Part Number
Blank : 2A
A : 3A
Output Version
Blank : Adjustable
33 : 3.3V
50 : 5.0V
12 : 12V
Package
K5 : TO263-5L
Lead Free
Packing
L : Lead Free -U : Tube
-13 : Tape & Reel
Device
Package
Code
Packaging
(Note 2)
Tube
Quantity
Part Number
Suffix
13” Tape and Reel
Quantity
Part Number
Suffix
AP1512X-XXK5Lead-free
K5
TO263-5L
50
-U 800/Tape & Reel -13
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.
AP1512/A Rev. 4
1 of 12
www.diodes.com
MAY 2008
© Diodes Incorporated



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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Pin Assignments
( Top View )
Metal Tab GND
TO263-5L
5 SD
4 FB
3 GND
2 Output
1 VIN
Pin Descriptions
Name
VIN
Output
GND
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
Block Diagram
SD
Current
Source
bias
1.235V
Reference
2.5V
Regulator
Start
up
200mV
220mV
+
Com_p
VIN
Comp
+
Frequecy
FB
+
_Amp
compen-
sation
Comp
+
Pre-driver
2A
Switch
(3A for
AP1512A)
Output
50KHz
OSC.
Thermal
Limit
Gnd
AP1512/A Rev. 4
2 of 12
www.diodes.com
MAY 2008
© Diodes Incorporated



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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Absolute Maximum Ratings
Symbol
ESD HBM
ESD MM
VCC
VSD
VFB
VOUT
TST
TJ
VOP
Parameter
Human Body Model ESD Protection
Machine Model ESD Protection
Supply Voltage
ON/OFF Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Storage Temperature
Operating Junction Temperature
Operating Voltage
Recommended Operating Conditions
Rating
4.5
450
+63
-0.3 to +40
-0.3 to +40
-1
-65 to +150
-40 to +125
+4.5 to +60
Unit
KV
V
V
V
V
V
oC
oC
V
Symbol
VIN
IOUT
TA
Parameter
Input Voltage
Output Current
Operating Ambient Temperature
Min Max
4.5 60
02
-20 85
Unit
V
A
oC
AP1512/A Rev. 4
3 of 12
www.diodes.com
MAY 2008
© Diodes Incorporated



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AP1512/A
50KHz, 2A/3A PWM BUCK DC/DC CONVERTER
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN = 30V for all version. ILOAD = 0.5A
Specifications with boldface type are for full operating temperature range, the other type are for TA = 25ºC.
Symbol
Parameter
Conditions
Min Typ.
IB
Feedback Bias Current
VFB = 1.3V
(Adjustable version only)
5
FOSC Oscillator Frequency
42.5 50
40
VSAT
DC
ICL
ICL
IL
IQ
Saturation Voltage
IOUT = 2A
no outside circuit
VFB = 0V force driver on
Max. Duty Cycle(ON)
VFB = 0V force driver on
Min. Duty cycle(OFF)
VFB = 12V force driver off
peak current
Current Limit for AP1512 no outside circuit
VFB = 0V force driver on
peak current
Current Limit for AP1512A no outside circuit
VFB = 0V force driver on
Output = 0
Output
leakage
Output = -1 current
no outside circuit
VFB = 12V force driver off
VIN = 60V
Quiescent Current
VFB = 12V force driver off
1.3
100
0
2.5 3
3.2 4
-2
5
ISTBY
Standby Quiescent
Current
ON/OFF pin = 5V
VIN = 60V
350
VIL ON/OFF pin logic input Low (regulator ON)
VIH threshold voltage
High (regulator OFF)
IH
ON/OFF pin logic
input current
VLOGIC = 2.5V (OFF)
IL ON/OFF pin input current VLOGIC = 0.5V (ON)
θJC Thermal Resistance
TO263-5L Junction to case
Thermal Resistance
θJA With copper area of
approximately 3 in2
TO263-5L Junction to ambient
-
2.0
1.3
0
-0.8
2.5
3.5
28
23
Max Unit
8 μA
10
57.5
KHz
60
1.4
V
1.5
4.5
5.5
5
6
-250
-60
10
450
500
%
A
A
uA
mA
mA
uA
0.6 V
-
-5 uA
-10
oC/W
oC/W
AP1512/A Rev. 4
4 of 12
www.diodes.com
MAY 2008
© Diodes Incorporated





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