CS8122YTVA5 datasheet(1/8 Pages) CHERRY

Part #	CS8122YTVA5

Description	2% 5V, 750mA Low Dropout Linear Regulator with Delayed RESET

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Manufacturer	CHERRY [Cherry Semiconductor Corporation]

Direct Link	http://www.cherrycorp.com/

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The CS8122 is a precision 5V linear reg-

ulator capable of sourcing in excess of

750mA. The

Õs delay time is

externally programmed using a discrete

RC network. During power up, or when

the output goes out of regulation, the

lead remains in the low state

for the duration of the delay. This func-

tion is independent of the input voltage

and will function correctly as long as

the output voltage remains at or above

1V. Hysteresis is included in the Delay

and the

comparators to

improve noise immunity. A latching

discharge circuit is used to discharge

the delay capacitor when it is triggered

by a brief fault condition.

The regulator is protected against a

variety of fault conditions: i.e. reverse

battery, overvoltage, short circuit and

thermal runaway conditions. The regu-

lator is protected against voltage tran-

sients ranging from -50V to +40V. Short

circuit current is limited to 1.2A (typ).

The CS8122 is an improved replacement

for the CS8126 and features a tighter tol-

erance on its output voltage (2% vs 4%).

The CS8122 is packaged in a 5 lead

TOÐ220 with copper tab. The copper tab

can be connected to a heat sink if

necessary.

RESET

1

2% 5V, 750mA Low Dropout Linear

Regulator with Delayed RESET

Features

s

5V +/- 2% Regulated

Output

s

Low Dropout Voltage

(0.6V @ 0.5A)

s

750mA Output Current

Capability

s

Externally Programmed

Delay

s

Fault Protection

Reverse Battery

60V Load Dump

-50V Reverse Transient

Short Circuit

Thermal Shutdown

RESET

Package Options

5 Lead TO-220

Description

Block Diagram

VOUT

VIN

Over Voltage

Shutdown

Pre-

Regulator

Regulated Supply

for Circuit Bias

Bandgap

Reference

Thermal

Shutdown

Anti-Saturation

and

Current Limit

-

+

-

Q

R

S

VDISC

Delay

Gnd

RESET

VOUT

SENSE

Error Amplifier

Latching Discharge

Delay Comparator

Charge

Current

Generator

CS8122

1VIN

2VOUT

3 Gnd

4 Delay

5 RESET

1

A

Company

¨

Rev. 2/5/99

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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