AIC1562
High-Efficiency, Bootstrapped DC/DC Converter
FEATURES
3V to 20V Input Voltage Operation.
Internal 800mA Switch.
Bootstrapped Driver for N-Channel MOSFET.
High Efficiency (up to 90%).
Fast Transient Response.
Internal
±2%
Reference.
Low Quiescent Current at 1.6mA.
Frequency Operation from 200Hz to 200KHz.
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.
APPLICATIONS
CPU Power Supplies for Mother Boards.
DC/DC Converters for CPU VRMs.
Step-Down DC-DC Converter Module.
TYPICAL APPLICATION CIRCUIT
C3
D2
1N4148
SC
BST
12V
+
C1
47µF
R8
10K
C11, C12: Ceramic Capacitor
L1: Iron Powder Core
V
OUT
= (1+R10/1K)x1.235V
SE
MTD20N03DH
Q1
0.1µF
1N4148
2N2907A
D3
R1
1K
Q2
+
V
IN
1000µF/6.3Vx2
C8, C9
L1
7.5µF
BYV118
0.022µF
R2
24K
C2
220pF
C4
Z1
5V
V
OUT
: 2.5V~3.5V/10A
+
1000µF
C10 C11 C12
0.1µF 0.1µF
1000µF/6.3V
x2
x2
x5
+
C13
P5
MICROPROCESSOR
CPU
AIC1562
TC
VCC
GND
FB
D1
5.1V
VIN
GND
FB
VOUT
R8
R7 C5
470 0.1µF 1K
R10
R9
1K
AIC1741
CPU Power Supply for P5 Mother Board
Analog Integrations Corporation
DS-1562-00
Jan 30, 01
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
1
AIC [ ANALOG INTERGRATIONS CORPORATION ]
