AIC1562
High-Efficiency, Bootstrapped DC/DC Converter
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw
DS-1562-00 Jan 30, 01 TEL: 886-3-5772500 FAX: 886-3-5772510 1
onesansinv FEATURES
tensans 3V to 20V Input Voltage Operation.
tensans Internal 800mA Switch.
tensans Bootstrapped Driver for N-Channel MOSFET.
tensans High Efficiency (up to 90%).
tensans Fast Transient Response.
tensans Internal ±2% Reference.
tensans Low Quiescent Current at 1.6mA.
tensans Frequency Operation from 200Hz to 200KHz.
onesansinv APPLICATIONS
tensans CPU Power Supplies for Mother Boards.
tensans DC/DC Converters for CPU VRMs.
tensans Step-Down DC-DC Converter Module.
onesansinv DESCRIPTION
The AIC1562 is a high performance monolithic
DC/DC converter drive IC with output-
bootstrapping capability, designed specifically for
driving N-channel MOSFET to achieve maximum
possible power conversion efficiency. The device
consists of an internal temperature compensated
reference, comparator, controlled duty cycle
oscillator, bootstrapped driver and a 800mA output
switch. Working with the AIC1741, a low power
adjustable regulator, the AIC1562 works at 100%
duty cycle under heavy load transient conditions to
minimize transient response time, making it an idea
precision switching power solution to stringent
requirements on computer mother boards.
onesansinv
TYPICAL APPLICATION CIRCUIT

+
+
VIN 5V
VOUT : 2.5V~3.5V/10A
12V
BYV
1
1
8
AIC1741
VOUT
GND
FB
VIN
1000µF/6.3Vx2
C8, C9
M
T
D
20N
03D
H
Q1
2N
2907
A
Q2
BST SE
AIC1562
SC
C1
47µF
+
P5
MICROPROCESSOR
CPU
1000µF/6.3V
x5
C12
0.1µF
x2
1000
µ
F
+
FB GND
R8
10K
C2
220pF
R2
VCC
TC
0.022µF
C4
R1
1K
C3
0.1µF
D3
D1
L1
7.5µF
R7
470
C5
0.1µF
R8
1K
R9
1K
R10
D2
1N4148
1N4148
Z1
5.1V
C11
0.1µF
x2
C10
C13
C11, C12: Ceramic Capacitor
L1: Iron Powder Core
VOUT= (1+R10/1K)x1.235V
24K
CPU Power Supply for P5 Mother Board