1

LT1761 Series

1761sfc

100mA, Low Noise,

LDO Micropower

Regulators in SOT-23

μA

2.8V, 3V, 3.3V, 5V

μF Output Capacitor

Ceramic Capacitors

■

Overcurrent and Overtemperature Protected

The LT

dropout regulators. With an external 0.01

μF bypass

capacitor, output noise drops to 20

100kHz bandwidth. Designed for use in battery-powered

systems, the low 20

μA quiescent current makes them an

ideal choice. In shutdown, quiescent current drops to less

than 0.1

μA. The devices are capable of operating over an

input voltage from 1.8V to 20V, and can supply 100mA of

output current with a dropout voltage of 300mV. Quies-

cent current is well controlled, not rising in dropout as it

does with many other regulators.

The LT1761 regulators are stable with output capacitors

as low as 1

μF. Small ceramic capacitors can be used

without the series resistance required by other regulators.

Internal protection circuitry includes reverse battery pro-

tection, current limiting, thermal limiting and reverse

current protection. The device is available in fixed output

voltages of 1.2V, 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V and

5V, and as an adjustable device with a 1.22V reference

voltage. The LT1761 regulators are available in the 5-lead

SOT-23 package.

10Hz to 100kHz Output Noise

5V Low Noise Regulator

■

Cellular Phones

■

Frequency Synthesizers

IN

SHDN

0.01

μF

10

μF

1761 TA01

OUT

5.4V TO

20V

BYP

GND

LT1761-5

5V AT100mA

20

1

μF

+

100

μV/DIV

20

1761 G48

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

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