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AP1507 (Anachip) : Total 9 Pages

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150KHz, 3A PWM Buck DC/DC Converter
AP1507
„ 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
- TO252-5L 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
„ Pin Assignments
„ General Description
The AP1507 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of
driving a 3A load without external transistor. 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. If current limit function occurred
and VFB 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 fixed 3.3V, 5V, 12V, and an adjustable
type. The package is available in a 5-lead TO-252.
„ Pin Descriptions
( Top View )
Metal Tab GND
TO252-5L
5 SD
4 FB
3 Gnd
2 Output
1 VIN
Name
VIN
Output
GND
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON /OFF Shutdown
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.1.1 Oct 29, 2004
1/9



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150KHz, 3A PWM Buck DC/DC Converter
AP1507
„ Ordering Information
AP1507 XX X X X
Output version
Package
Lead Free
Packing
Blank : Adjustable
-33 : 3.3V
-50 : 5.0V
-12 : 12V
D5: TO252-5L Blank : Normal
Blank : Tube
L : Lead Free Package A : Taping
„ 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
3A
Switch
150kHz
OSC.
Thermal
Shutdown
Output
Gnd
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
2/9



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150KHz, 3A PWM Buck DC/DC Converter
AP1507
„ Absolute Maximum Ratings
Symbol
VCC
VSD
VFB
VOUT
PD
TST
TOP
VOP
Parameter
Supply Voltage
ON /OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
Rating
+24
-0.3 to +18
-0.3 to +18
-1
Internally limited
-65 to +150
-40 to +125
+4.5 to +22
„ Electrical Characteristics (All Output Voltage Versions)
Unit
V
V
V
V
W
oC
oC
V
Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=18V for the 12V version. ILOAD = 0.5A
Symbol
Parameter
Conditions
Min. Typ. Max.
IFB Feedback bias current
VFB=1.3V
(Adjustable version only)
-10
-50
-100
FOSC Oscillator frequency
127 150 173
110 173
FSCP
Oscillator frequency of When current limit occurred
short circuit protect
and VFB < 0.5V, Ta=25 oC
5
15 25
VSAT Saturation voltage
DC
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
ICL Current limit
IOUT=3A
No outside circuit
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
Peak current
No outside circuit
VFB=0V force driver on
1.6
1.4 1.7
100
0
5.5
3.6 4.5
6.5
ILEAK
Output = 0V
Output = -1V
Output No outside circuit
leakage VFB=12V force driver off
current VIN=22V
-200
-5
IQ
ISTBY
VIL
VIH
Quiescent Current
Standby Quiescent
Current
ON /OFF pin logic input
threshold voltage
VFB=12V force driver off
ON /OFF pin=5V
VIN=22V
Low (regulator ON)
High (regulator OFF)
5 10
150
70 200
- 0.6
2.0 1.3
-
IH
ON /OFF pin logic input
current
VLOGIC=2.5V (OFF)
IL ON /OFF pin input current VLOGIC=0.5V (ON)
ΘJC Thermal Resistance
TO252-5L
Junction to
case
ΘJA
Thermal Resistance
With copper area of
TO252-5L
approximately 2cm ×2cm
Junction to
ambient
-0.1
10
50
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
-0.01
-1
Unit
nA
KHz
KHz
V
%
A
uA
mA
mA
uA
V
uA
oC/W
oC/W
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
3/9



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150KHz, 3A PWM Buck DC/DC Converter
AP1507
„ Electrical Characteristics (Continued)
Symbol
AP1507-ADJ
VFB
η
Parameter
Output
Feedback
Efficiency
Conditions
5V < VIN < 22V
0.2A < ILOAD < 3A
VOUT programmed for
3V
VIN = 12V, ILOAD=3A
Typ.
1.23
74
Limit
1.193/1.18
1.267/1.28
AP1507-3.3V
VOUT
η
Output voltage
5.5V < VIN < 22V
0.2A < ILOAD < 3A
3.3
3.168/3.135
3.432/3.465
Efficiency VIN = 12V, ILOAD=3A 75
AP1507-5V
VOUT
η
Output voltage
8V < VIN < 22V
0.2A < ILOAD < 3A
Efficiency VIN = 12V, ILOAD=3A
5
80
4.8/4.75
5.2/5.25
AP1507-12V
VOUT
Output voltage
15V < VIN < 22V
0.2A < ILOAD < 3A
12
11.52/11.4
12.48/12.6
η Efficiency VIN = 16V, ILOAD = 3A 89
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Unit
V
VMIN
VMAX
%
V
VMIN
VMAX
%
V
VMIN
VMAX
%
V
VMIN
VMAX
%
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
4/9





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