1

LT1761 Series

100mA, Low Noise,

LDO Micropower

Regulators in SOT-23

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Tiny 5-Lead SOT-23 Package

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Low Noise: 20

s

Low Quiescent Current: 20

µA

s

Wide Input Voltage Range: 1.8V to 20V

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Output Current: 100mA

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Very Low Shutdown Current: < 0.1

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Low Dropout Voltage: 300mV at 100mA

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Fixed Output Voltages: 1.5V, 1.8V, 2V, 2.5V, 2.8V,

3V, 3.3V, 5V

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Adjustable Output from 1.22V to 20V

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Stable with 1

µF Output Capacitor

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Stable with Aluminum, Tantalum or

Ceramic Capacitors

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Reverse Battery Protected

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No Reverse Current

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No Protection Diodes Needed

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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 1.5V, 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

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Cellular Phones

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Pagers

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Battery-Powered Systems

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Frequency Synthesizers

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Wireless Modems

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

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