AIC1721/1721D
3-pin Low Dropout Linear Regulator
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw
DS-1721-01 TEL: 886-3-5772500 FAX: 886-3-5772510 1
onesansinv FEATURES
tensans Low Dropout Voltage of 130mV at 100mA Output
Current (5V Output Version).
tensans Guaranteed 150mA/300mA Output Current.
tensans Internal 1.3Ω P-MOSFET Draws no Base Current.
tensans Low Ground Current at 55µA.
tensans 1% Accuracy Output Voltage of 3.3V/5V.
tensans Input Voltage Range up to 12V (5V Output
Version).
tensans Extremely Tight Load and Line Regulation.
tensans Fast Transient Response.
tensans Needs only 1µF for Stability.
tensans Current and Thermal Limiting.
onesansinv APPLICATIONS
tensans Voltage Regulator for LAN Cards.
tensans Wireless Communication Systems.
tensans Battery Powered Systems.
onesansinv DESCRIPTION
The AIC1721/1721D is the enhanced CMOS
version of the LP2950. The superior
characteristics of the AIC1721/1721D include
zero base current loss, very low dropout voltage,
and 1% accuracy output voltage. Typica-l ground
current remains approximately 55µA, from no
load to maximum loading conditions. Dropout
voltage at 100mA output current is significantly
lower than its bipolar counterpart: 130mV for the
AIC1721-5/1721D-5, and 180mV for the
AIC1721/ 1721D. Output current limiting and
thermal limiting are built in to provide maximal
protection to the AIC1721/ 1721D against fault
conditions.
While pin-to-pin compatible with the LP2950 and
the industry industry standard 78XX series of
voltage regulators, the AIC1721/1721D comes in
the popular3-pin SOT-89 or TO-92 packages.


onesansinv TYPICAL APPLICATION CIRCUIT

++
AIC1721/
AIC1721D
10µF
C
OUT
V
OUT
VOUT
GND
VIN
1µF
C
IN
V
IN
Negative Voltage Regulator