cs8121ytva5 ON Semiconductor, cs8121ytva5 Datasheet

cs8121ytva5

Manufacturer Part Number

cs8121ytva5

Description

5v, 1a Linear Regulator

Manufacturer

ON Semiconductor

Datasheet

1.CS8121YTVA5.pdf (8 pages)

Current page: 1 of 8
Download datasheet (99Kb)

December, 2001 - Rev. 7

ENABLE

RESET

The CS8121 is a 5V, 1A precision linear

regulator with two microprocessor

compatible control functions and pro-

tection circuitry included on chip. The

composite NPN-PNP output pass tran-

sistor assures a lower dropout voltage

(1.2V @ 1A) without requiring exces-

sive supply current (4mA).

The CS8121’s two logic control func-

tions make this regulator well suited to

applications requiring microprocessor-

based control at the board or module

level.

stage. A high voltage (>2.9V) on

the

tor’s pass transistor and sends the IC

into Sleep mode where it draws only

ENABLE

V REF

lead turns off the regula-

ENABLE

with

controls the output

Comparator

TO V

OUT

5V, 1A Linear Regulator

Bandgap

Comparator

Supply

RESET

Description

Block Diagram

RESET

Reference

Shutdown

Bandgap

Thermal

Voltage

Over

250µA.

when the IC is powering up or when-

ever the output voltage falls out of reg-

ulation. The

down to V

The CS8121 design optimizes supply

rejection by switching the internal

bandgap reference from the supply

input to the regulator output as soon as

the nominal output voltage is achieved.

Additional on chip filtering enhances

rejection of high frequency transients

on all external leads.

The CS8121 is fault protected against

short circuit, over voltage and thermal

runaway conditions.

CS8121

RESET

Amplifier

Error

OUT

RESET

= 1V.

Current

Output

sends a

Limit

and ENABLE

signal is valid

RESET

Gnd

signal

OUT

OUT(SENSE)

5 Lead

TO-220

2000 South County Trail, East Greenwich, RI 02818

N. American Technical Support: 800-282-9855

Tel: (401)885–3600 Fax: (401)885–5786

7 Lead D

Web Site: www.cherry–semi.com

5V ± 4% Output Voltage

Low Dropout Voltage

Low Quiescent Current

µP Compatible Control

Functions

Low Current Sleep Mode

Fault Protection

5 Lead TO-220

Package Options

(1.2V @ 1A)

(4mA @ I

Thermal Shutdown

60V Peak Transient

Voltage

Short Circuit

RESET

ENABLE

ON Semiconductor

Features

= 250µA

PAK

1 V

3 Gnd

5 V

OUT

1 NC

2 V

4 Gnd

6 V

7 V

RESET

ENABLE

OUT

RESET

ENABLE

OUT

OUT(SENSE)

= 1A)

Related parts for cs8121ytva5

cs8121ytva5 Summary of contents

Page 1

... Gnd RESET OUT Lead D PAK ENABLE 3 4 Gnd RESET OUT OUT(SENSE) ON Semiconductor 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885–3600 Fax: (401)885–5786 N. American Technical Support: 800-282-9855 Web Site: www.cherry–semi.com ...

Page 2

DC Input Voltage ...........................................................................................................................................................-0.7 to 26V Peak Transient Voltage (46V Load Dump).............................................................................................................................60V Output Current .................................................................................................................................................Internally Limited Electrostatic Discharge (Human Body Model) ......................................................................................................................2kV Operating, Temperature ..........................................................................................................................................-40C to 125°C Junction Temperature...............................................................................................................................................-40C to 150°C Storage Temperatures.............................................................................................................................................-55°C to 150°C Lead Temperature Soldering Wave Solder ...

Page 3

PACKAGE LEAD # 7 Lead 5 Lead TO-220 2 D PAK Output Voltage vs. Temperature 5.02 5.01 5.00V @ 25˚C 5 4.99 4.98 4.97 4.96 4.95 -40 -20 ...

Page 4

Quiescent Current vs. Output Current Over Temperature 3.5 3.0 - 2.0 125 C 1.5 1.0 0.5 VIN = 14V 0.0 0 0.1 0.2 0.3 0.4 0.5 I OUT Voltage Reference and Output Circuitry Precision Voltage Reference ...

Page 5

If the input voltage rises above 30V (e.g. load dump), the output shuts down. This response protects the internal cir- cuitry and enables the IC to survive unexpected voltage transients. Using an emitter sense scheme, the amount of current through ...

Page 6

V BAT SWITCH Figure 5. Microprocessor control of CS8121 using external switching transistor Q The circuit depicted in Figure 5 lets the microprocessor control its power source, the CS8121 regulator. An I/O port on the µP and the SWITCH port ...

Page 7

0 *required if regulator is located far from 1 the power supply filter required for stability. 2 Figure 6: Test and application circuit showing output compensation. Step 6: Test the load ...

Page 8

... REF TERMINAL 8 6.50 (.256) REF 4.57 (.180) 7.75 (.305) 4.31 (.170) REF *ON SEMICONDUCTOR SHORT-LEADED FOOTPRINT Ordering Information Part Number Description CS8121YT5 5 Lead TO-220 Straight CS8121YTVA5 5 Lead TO-220 Vertical CS8121YTHA5 5 Lead TO-220 Horizontal 2 CS8121YDPS7 7 Lead D 2 CS8121YDPSR7 7 Lead D (tape & reel) Package Specification Thermal Data R ...

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