LP3982

Micropower, Ultra Low-Dropout, Low-Noise, 300mA

CMOS Regulator

General Description

The LP3982 low-dropout (LDO) CMOS linear regulator is

available in 1.8V, 2.5V, 2.77V, 2.82V, 3.0V, 3.3V, and adjust-

able versions. They deliver 300mA of output current. Pack-

aged in an 8-Pin MSOP, the LP3982 is pin and package

compatible with Maxim’s MAX8860. The LM3982 is also

available in the small footprint LLP package.

The LP3982 suits battery powered applications because of

its shutdown mode (1nA typ), low quiescent current (90µA

typ), and LDO voltage (120mV typ). The low dropout voltage

allows for more utilization of a battery’s available energy by

operating closer to its end-of-life voltage. The LP3982’s

PMOS output transistor consumes relatively no drive current

compared to PNP LDO regulators.

This PMOS regulator is stable with small ceramic capacitive

loads (2.2µF typ).

These devices also include regulation fault detection, a

bandgap voltage reference, constant current limiting and

thermal overload protection.

Features

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MAX8860 pin, package and spec. compatible

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LLP space saving package

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300mA guaranteed output current

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90µA typical quiescent current

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1nA typical shutdown mode

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60dB typical PSRR

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2.5V to 6V input range

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120µs typical turn-on time

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Stable with small ceramic output capacitors

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37µV RMS output voltage noise (10Hz to 100kHz)

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Over temperature/over current protection

2% output voltage tolerance

Applications

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Wireless handsets

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DSP core power

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Battery powered electronics

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Portable information appliances

Application Circuit

20036931

July 2002

© 2002 National Semiconductor Corporation

DS200369

www.national.com