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AP1509 (Anachip) : Total 8 Pages

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150KHz, 2A PWM Buck DC/DC Converter
AP1509
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: 2A
- SOP-8L 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 AP1509 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of
driving a 2A 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. If current
limit function occurred and VFB is down to 0.5V
below, the switching frequency will be reduced.
The AP1509 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 packages are
available in a standard 8-lead SOP-8 package.
Pin Descriptions
VIN
Output
FB
SD
(Top View)
18
27
36
45
SOP-8L
GND
GND
GND
GND
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. 0.1 Nov 27, 2003
1/8



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150KHz, 2A PWM Buck DC/DC Converter
AP1509
Ordering Information
AP1509 XX X X X
Output version
Blank : Adjustable
-33 : 3.3V
-50 : 5.0V
-12 : 12V
Package
Lead Free
Packing
S: SOP-8L 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
2A
Switch
150kHz
OSC.
Thermal
Limit
Output
Gnd
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Nov 27, 2003
2/8



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150KHz, 2A PWM Buck DC/DC Converter
AP1509
Absolute Maximum Ratings
Symbol
Parameter
VCC Supply Voltage
VSD ON/OFF Pin input voltage
VFB Feedback Pin voltage
VOUT
Output voltage to Ground
PD Power dissipation
TST Storage temperature
TOP Operating temperature
VOP 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
Unit
V
V
V
V
W
oC
oC
V
Electrical Characteristics (All Output Voltage Versions)
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.
IB
Feedback bias current
VFB=1.3V
(Adjustable version only)
-10
-50
-100
FOSC Oscillator frequency
127 150 173
110 173
FSCP
VSAT
DC
Oscillator frequency of When current limit occurred
short circuit protect
and VFB < 0.5V, Ta=25 oC
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
5
15
1.25
100
0
25
1.4
1.5
ICL
IL
IQ
ISTBY
VIL
VIH
Current limit
Output = 0
Output
leakage
Output = -1 current
Quiescent Current
Standby Quiescent
Current
ON/OFF pin logic input
threshold voltage
No outside circuit
VFB=0V force driver on
No outside circuit
VFB=12V force driver off
VIN=22V
VFB=12V force driver off
ON/OFF pin=5V
VIN=22V
Low (regulator ON)
High (regulator OFF)
3
-200
-5
5 10
70
150
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
SOP-8L
Junction to
case
Thermal Resistance
ΘJA With copper area of
approximately 3 in2
SOP-8L
Junction to
ambient
-0.01
-0.1 -1
15
70
Unit
nA
KHz
KHz
V
%
A
uA
mA
mA
uA
V
uA
oC/W
oC/W
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Nov 27, 2003
3/8



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150KHz, 2A PWM Buck DC/DC Converter
AP1509
Electrical Characteristics (Continued)
AP1509-ADJ
AP1509-3.3V
AP1509-5V
AP1509-12V
Symbol
VFB
η
VOUT
η
VOUT
η
VOUT
η
Parameter
Output
Feedback
Efficiency
Conditions
4.5V < VIN < 22V
0.2A < ILOAD < 2A
VOUT programmed for
3V
VIN = 12V, ILOAD=2A
Typ.
1.23
76
Output voltage
4.75V < VIN < 22V
0.2A < ILOAD < 2A
3.3
Efficiency
VIN = 12V, ILOAD=2A
78
Output voltage
7V < VIN < 22V
0.2A < ILOAD < 2A
5
Efficiency
VIN = 12V, ILOAD=2A
83
Output voltage
15V < VIN < 22V
0.2A < ILOAD < 2A
12
Efficiency
VIN = 15V, ILOAD = 2A 90
Limit
1.193/1.18
1.267/1.28
3.168/3.135
3.432/3.465
4.8/4.75
5.2/5.25
11.52/11.4
12.48/12.6
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Typical Application Circuit
Unit
V
VMIN
VMAX
%
V
VMIN
VMAX
%
V
VMIN
VMAX
%
V
VMIN
VMAX
%
12V
DC Input
Cin
Capacitor
FB
3
AP1509
1
Vin
-33
2
Output
L1
Inductor
4 5 6 78
SD Gnd Gnd Gnd Gnd
D1
Schottky Diode
3.3V/2A
Output Load
Co
Capacitor
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Nov 27, 2003
4/8





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