CS8151C View Datasheet(PDF) - Cherry semiconductor

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CS8151C

5V, 100mA Low Dropout Linear Regulator with Watchdog, RESET, & Wake Up

Cherry semiconductor 

CS8151C

5V, 100mA Low Dropout Linear Regulator

with Watchdog, RESET, & Wake Up

Description

The CS8151C is a precision 5V, 100mA

micro-power voltage regulator with

very low quiescent current (400µA typ-

ical at 200µA load). The 5V output is

accurate within ±1% and supplies 100

mA of load current with a typical

dropout voltage of 400mV.

Microprocessor control logic includes

Watchdog, Wake Up and RESET . This

unique combination of low quiescent

current and full microprocessor con-

trol makes the CS8151C ideal for use in

battery operated, microprocessor con-

trolled equipment.

The CS8151C Wake Up function brings

the microprocessor out of Sleep mode.

The microprocessor in turn, signals its

Wake Up status back to the CS8151C

by issuing a Watchdog signal.

The Watchdog logic function monitors

an input signal (WDI) from the micro-

processor. The CS8151C responds to

the falling edge of the Watchdog signal

which it expects at least once during

each wake-up period. When the cor-

rect Watchdog signal is received, a

falling edge is issued on the wake-up

signal line.

RESET is independent of VIN and

operates correctly to an output voltage

as low as 1V. A RESET signal is issued

in any of three situations. During

power up the RESET is held low until

the output voltage is in regulation.

During operation if the output voltage

shifts below the regulation limits, the

RESET toggles low and remains low

until proper output voltage regulation

is restored. And finally, a RESET signal

is issued if the regulator does not

receive a Watchdog signal within the

Wake Up period.

The RESET pulse width, Wake Up sig-

nal frequency, and Wake Up delay

time are all set by one external capaci-

tor CDelay.

The regulator is protected against

short circuit, over voltage, and thermal

runaway conditions. The device can

withstand 74 volt load dump tran-

sients, making it suitable for use in

automotive environments.

Features

s 5V ±1% / 100 mA Output

Voltage

s Micropower Compatible

Control Functions:

Wake Up

Watchdog

RESET

s Low Dropout Voltage:

400mV @ 100mA

s Low Sleep Mode Quiescent

Current (400µA typ)

s Protection Features:

Thermal Shutdown

Short Circuit

74V Load Dump

Reverse Transient (-50V)

Package Options

8 Lead PDIP

Block Diagram

VIN

Current Source

(Circuit Bias)

Over

Voltage

Shutdown

Current Limit

Sense

VOUT

VOUT

WAKE UP

VIN 1

WDI

WAKE UP

RESET

VOUT

Gnd

N/C

Delay

Delay

WDI

RESET

Timing

Circuit

WAKE UP

Circuit

Falling Edge

Detector

VOUT

WATCHDOG

Circuit

Thermal

Shutdown

+ - Error

Amplifier

Bandgap

Reference

RESET

Circuit

Rev. 3/17/99

Sense

Gnd

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: (401)885-3600 Fax: (401)885-5786

Email: info@cherry-semi.com

Web Site: www.cherry-semi.com

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