LM2984 Datasheet, PDF(1/16 Page) National Semiconductor (TI)

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LM2984 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Microprocessor Power Supply System

April 1998

LM2984

Microprocessor Power Supply System

General Description

The LM2984 positive voltage regulator features three inde-

pendent and tracking outputs capable of delivering the

power for logic circuits, peripheral sensors and standby

memory in a typical microprocessor system. The LM2984 in-

cludes circuitry which monitors both its own high-current out-

put and also an external ÂµP. If any error conditions are

sensed in either, a reset error flag is set and maintained until

the malfunction terminates. Since these functions are in-

cluded in the same package with the three regulators, a

great saving in board space can be realized in the typical mi-

croprocessor system. The LM2984 also features very low

dropout voltages on each of its three regulator outputs (0.6V

at the rated output current). Furthermore, the quiescent cur-

rent can be reduced to 1 mA in the standby mode.

Designed also for vehicular applications, the LM2984 and all

regulated circuitry are protected from reverse battery instal-

lations or 2-battery jumps. Familiar regulator features such

as short circuit and thermal overload protection are also pro-

vided. Fixed outputs of 5V are available in the plastic TO-220

power package.

Features

n Three low dropout tracking regulators

n Output current in excess of 500 mA

n Fully specified for â40ËC to +125ËC operation

n Low quiescent current standby regulator

n Microprocessor malfunction RESET flag

n Delayed RESET on power-up

n Accurate pretrimmed 5V outputs

n Reverse battery protection

n Overvoltage protection

n Reverse transient protection

n Short circuit protection

n Internal thermal overload protection

n ON/OFF switch for high current outputs

n P+ Product Enhancement tested

Typical Application Circuit

DS011252-1

COUT must be at least 10 ÂµF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to

the regulator. This capacitor must be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this

capacitor is critical; see curve.

Order Number LM2984T

See NS Package Number TA11B

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