ADVANCED INFORMATION AIC1596
3A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1596-P1 03/23/00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 1
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FEATURES
" Operating Input Voltage From 4.5V to 36V
" 2.5V, 3.3V, 5V , 12V and Adjustable Output Ver-
sion
" Adjustable Version Output Voltage Range , 1.25V
to 30V ± 4% max Over Line and Load Regulation
" Available in TO220-5 and TO263-5 Package
" Requires Only 4 External Components.
" 150KHz/300KHz Fixed Constant Frequency
" Low Power Standby Mode, IQ Typically 80µA
" TTL Shutdown Capability.
" Output Overvoltage Protection
" Current Limit and Thermal Shutdown Protection.
" 3A Guaranteed Output Current
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APPLICATIONS
" Simple High Efficiency Step-down regulator
" On-Card Switching regulators
" Fixed Voltage power supply for LCD Monitor
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DESCRIPTION
The AIC1596 series are step-down monolithic
PWM regulators delivering 3A at fixed voltages of
2.5V , 3.3V, 5.0V , 12V and using a external di-
vider to adjust output voltage from 1.25V to 30V
with excellent line and load regulation.
Switching frequency up to 150KHz/300KHz are
achievable thus allowing smaller sized filter com-
ponents. Internal current limit and thermal shut-
down circuits provide protection from overloads. It
also provides output overvoltage and short pro-
tection under fault conditions.
The internal precious reference combined with
voltage feedback loop provides optimum output
voltage accuracy and fast load transient response.
Packages available are in standard TO220-5 for
standard assembly and TO263-5 for SMD.

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TYPICAL APPLICATION CIRCUIT
L1
R1
R2
+
C3
+
C1
C2
D1
V
OUT
V
IN
IN
1
SHDN
5
OUT
2
FB
4
3
GND
AIC1596
R1 short and R2 open for fixed
switching output version
3A Precision PWM DC/DC Regulator