AIC1741
LOW DROPOUT ADJUSTABLE REGULATOR
SPEC NO: DS-1741-00
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
onesansinv FEATURES
tensans 1% Accuracy 1.235V Voltage Reference.
tensans Fast Transient Response.
tensans Low Ground Current at 55µA.
tensans Wide Output Current Range, 10µA~80mA.
tensans Output Programmable from 1.235V~11V.
tensans Low Temperature Coefficiency.
tensans Error Flag Warns of Output Dropout.
onesansinv APPLICATIONS
tensans Voltage Regulator for Pentium
®
CPUs.
tensans Wireless Communication System.
tensans 5V to 3.3V Regulator for VGA Cards.
tensans Battery Powered Systems.
onesansinv DESCRIPTION
The AIC1741 is a low power precision adjustable
regulator with 80mA output capability. The device
can be used as a secondary regular to provide
feedback in a switching power supply.
The AIC1741 circuitry includes an internal wide
band amplifier, a precision bandgap reference,
and a PMOS output transistor. The feedback
input can be connected to an external resistor
divider to program the sensed output voltage.
The VOUT pin provides loop frequency
compensation when used as a part of a larger
servo system.
Although the device works as a stand-alone
regulator, it can also drive an NPN power
transistor to construct a high current low dropout
regulator, with only very minor current loss to
ground.
onesansinv TYPICAL APPLICATION CIRCUIT


C2
33µF
+
C1
10µF
+
C3
R1
390
R2
1.2K
R3
2K
Q1
TIP31C
NCNC
6
5
4
2
3
AIC1741
8
7
1
FB
FLAGGND
NC
VINVOUT
V
IN
5V
V
OUT
3.3V/3 A
10µF
+
5V to 3.3V Regulator for VGA Cards.
onesansinv ORDERING INFORMATION

AIC1741 XX
ORDER NUMBER
AIC1741CN
(PLASTIC DIP)
AIC1741CS
(PLASTIC SO)
PIN CONFIGURATION
TOP VIEW
FLAG
1
3
4
2
8
6
5
7
VIN
NC
GND
NC
FB
NC
VOUT
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C: 0°C~+70°C
Pentium
®
is a registered trademark of Intel Corporation