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LT1763 Series

1763fa

500mA, Low Noise, LDO

Micropower Regulators

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Low Noise: 20

s

Output Current: 500mA

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Low Quiescent Current: 30

µA

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Wide Input Voltage Range: 1.8V to 20V

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Low Dropout Voltage: 300mV

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Very Low Shutdown Current: < 1

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No Protection Diodes Needed

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Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V

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Adjustable Output from 1.22V to 20V

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Stable with 3.3

µF Output Capacitor

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Stable with Aluminum, Tantalum or

Ceramic Capacitors

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Reverse Battery Protection

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No Reverse Current

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Overcurrent and Overtemperature Protected

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8-Lead SO Package

The LT

dropout regulators. The devices are capable of supplying

500mA of output current with a dropout voltage of 300mV.

Designed for use in battery-powered systems, the low

30

µA quiescent current makes them an ideal choice.

Quiescent current is well controlled; it does not rise in

dropout as it does with many other regulators.

A key feature of the LT1763 regulators is low output noise.

With the addition of an external 0.01

µF bypass capacitor,

output noise drops to 20

bandwidth. The LT1763 regulators are stable with output

capacitors as low as 3.3

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 parts come in fixed output volt-

ages of 1.5V, 1.8V, 2.5V, 3V, 3.3V and 5V, and as an

adjustable device with a 1.22V reference voltage. The

LT1763 regulators are available in the 8-lead SO package.

Dropout Voltage

3.3V Low Noise Regulator

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Cellular Phones

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Battery-Powered Systems

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Noise-Sensitive Instrumentation Systems

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

IN

SHDN

0.01

µF

10

µF

1763 TA01

OUT

SENSE

3.7V TO

20V

BYP

GND

LT1763-3.3

3.3V AT 500mA

20

1

µF

+

OUTPUT CURRENT (mA)

0

400

350

300

250

200

150

100

50

0

400

1763 TA02

100

200

300

500

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO