1

LT3023

3023f

APPLICATIO S

DESCRIPTIO

FEATURES

TYPICAL APPLICATIO

Dual 100mA,

Low Dropout, Low Noise,

Micropower Regulator

s

Low Noise: 20

s

Low Quiescent Current: 20

µA/Channel

s

Wide Input Voltage Range: 1.8V to 20V

s

Output Current: 100mA/Channel

s

Very Low Shutdown Current: <0.1

s

Low Dropout Voltage: 300mV at 100mA

s

Adjustable Output from 1.22V to 20V

s

Stable with 1

µF Output Capacitor

s

Stable with Aluminum, Tantalum or

Ceramic Capacitors

s

Reverse Battery Protected

s

No Reverse Current

s

No Protection Diodes Needed

s

Overcurrent and Overtemperature Protected

s

Thermally Enhanced 10-Lead MSOP and DFN

Packages

The LT

out regulator. With an external 0.01

µF bypass capacitor,

output noise drops to 20

bandwidth. Designed for use in battery-powered systems,

the low 20

µA quiescent current per channel makes it an

ideal choice. In shutdown, quiescent current drops to less

than 0.1

µA. Shutdown control is independent for each

channel, allowing for flexibility in power management. The

device is capable of operating over an input voltage from

1.8V to 20V, and can supply 100mA of output current from

each channel with a dropout voltage of 300mV. Quiescent

current is well controlled in dropout.

The LT3023 regulator is 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 as an adjustable

device with a 1.22V reference voltage. The LT3023 regu-

lator is available in the thermally enhanced 10-lead MSOP

and DFN packages.

10Hz to 100kHz Output Noise

3.3V/2.5V Low Noise Regulators

s

Cellular Phones

s

Pagers

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Battery-Powered Systems

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Frequency Synthesizers

s

Wireless Modems

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

100

µV/DIV

20

3023 TA01b

IN

SHDN2

0.01

µF

0.01

µF

10

µF

3023 TA01

OUT1

3.7V TO

20V

BYP1

ADJ1

OUT2

BYP2

ADJ2

GND

LT3023

3.3V AT100mA

20

2.5V AT100mA

20

1

µF

SHDN1

10

µF

422k

249k

261k

249k