AIC AIC1401-CS Datasheet
AIC1401
PWM Step-Down Switching Controller with
Shutdown
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw
DS-1401-00 May 24, 01 TEL: 886-3-5772500 FAX: 886-3-5772510 1
n FEATURES
l Operation Voltage up to 15V
l Voltage-Mode Operation
l Fast Transient Response
l Built In Accurate 1.3V Voltage Reference
l Adjustable Over Current Protection using
R
DS(ON)
No External Current Sense Resistor
Required
l Low Shutdown Current
l 200KHz Free-Running Oscillator
l Built in Soft Start.
n APPLICATIONS
l Notebook PC
l Advanced PC Mboards
l Information PCs
l Servers and Workstations
l PC Add-On Cards
n DESCRIPTION
The AIC1401 is a high efficiency, PWM stepdown, voltage-mode, switching controller. It is
suitable for IA, Notebook, LCD PC and LCD
monitor main power applications.
The built-in high voltage CMOS driver drives an
external N-channel MOSFET for replacing the
higher cost P-channel MOSFET in a standard
buck topology.
The 200KHz switching frequency allows using
smaller external components while maintaining
high conversion efficiency. The 11MHz
bandwidth and 6V/us slew rate of the error
amplifier ensures the higher converter
bandwidth and the fast transient response.
The AIC1401 also features over current
protection. It provides adjustable over current
trigger point and short-circuit protections by
sensing the output current across the on
resistance of the external N-channel MOSFET
rather then an expensive external low value
sense resistor.
n ORDERING INFORMATION
ORDER NUMBER
AIC1401CS
(SOP8)
PIN CONFIGURATION
TOP VIEW
LX
1
3
4
2
VCC
/SHDN
COMP
FB
UG
GND
8
6
5
7
OCSET
PACKAGE TYPE
S: SMALL OUTLINE
TEMPERATURE RANGE
C: 0°C ~+70°C
AIC1401-XX
AIC1401
2
n
TYPICAL APPLICATION CIRCUIT
AIC1401
*C1
1µF
C5 33P
C6
1000P
C2
1000P
+
C4
330µFX3
+
C3
470µF
R4
13K
R3
2K
R6
5K
R2
90.9K
R5 10
R1
2.2K
L2
7µH
L1
1.5µH
D1
SRA1620
M1
IR3303
1.5V/5A
*C1 must be very close
to VCC PIN
VOUT
5V
12V
OCSET
/SHDN
COMP
FB
VCC
UG
LX
GND
DC/DC Converter
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC....…...………............................…………......................................... 15V
Input, Output, or I/O Voltage ...............………………....……......... GND - 0.3V to VCC+0.3V
ESD Classification.............................………….....……..............……......................... Class 2
Recommended Operating Conditions
Supply Voltage, VCC....…......................………….......……….................................. 12V ±10%
Ambient Temperature Range .…................................………….……….................. 0°C~70°C
Junction Temperature Range ....…............……….........…..……......................... 0°C~ 100°C
Thermal Information
Thermal Resistance, θJA (Typical, Note 1)
SOIC Package ...............................………………………..……………........…. 100°C/W
SOIC Package (with 3 in2 of Copper) ……………………………………......….. 90°C/W
Maximum Junction Temperature (Plastic Package) ……….……..………................... 150°C
Maximum Storage Temperature Range …………..…………......…….…......... –65°C~150°C
Maximum Lead Temperature (Soldering 10 Sec) …………………...……......…......... 300°C
Note 1: θJA is measured with the component mounted on an evaluation PC board in free air.
n TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
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