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

FEATURES

Low Dropout Voltage of 130mV at 100mA Output

Current (5V Output Version).

Guaranteed 150mA/300mA Output Current.

Internal 1.3

Ω P-MOSFET Draws no Base Current.

Low Ground Current at 55

µA.

1% Accuracy Output Voltage of 3.3V/5V.

Input Voltage Range up to 12V (5V Output

Version).

Extremely Tight Load and Line Regulation.

Fast Transient Response.

Needs only 1

µF for Stability.

Current and Thermal Limiting.

APPLICATIONS

Voltage Regulator for LAN Cards.

Wireless Communication Systems.

Battery Powered Systems.

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 55

µA, 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.

TYPICAL APPLICATION CIRCUIT

+

+

AIC1721/

AIC1721D

10

µF

VOUT

GND

VIN

1

µF

Negative Voltage Regulator