CS8128YD8 Cherry Semiconductor Corporation, CS8128YD8 Datasheet

CS8128YD8

Manufacturer Part Number

CS8128YD8

Description

5V Linear Controller/Driver

Manufacturer

Cherry Semiconductor Corporation

Datasheet

1.CS8128YD8.pdf (6 pages)

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Rev. 2/5/99

The CS8128 contains all the necessary

control circuitry to implement a 5V lin-

ear regulator. An external pass device is

used to produce superior performance

compared to conventional monolithic

regulators. The CS8128 with a TIP42

PNP transistor typically provides a

100mV dropout voltage at 500mA,

increasing to 350mV at 3A. Quiescent

current at 500mA is only 5mA.

Monolithic regulators cannot approach

these figures because their power tran-

sistors do not provide the high beta and

excellent saturation characteristics at

high currents. The CS8128 is compatible

with a wide variety of external transis-

tors, allowing flexibility for thermal,

space, and cost management.

The CS8128 includes thermal shutdown

and externally programmable current

limit and over-voltage shutdown, mak-

ing it suitable for use in automotive and

switching regulator post regulator appli-

cations. An optional external RC filter

added to the CS8128 supply lead pro-

vides EMC hardening in addition to the

on-chip EMC hardening. The SENSE

Pwr Gnd

Ref Gnd

Delay

Regulated Supply

for Circuit Bias

REGULATOR

PRE-

10µA

Delay

Current

Power

Gnd

Reference

Gnd

dis

5V Linear Controller/Driver

Discharge

Latching

Q S

Description

Block Diagram

Reference

Bandgap

Shutdown

Thermal

Delay

Comparator

Reset

Comparator

1.25V

lead allows remote sensing of the output

voltage for improved regulation.

An active microprocessor RESET func-

tion is included on-chip with externally

programmable delay time. During

power-up, or after detection of any error

in the regulated output, the RESET lead

will remain in the low state for the dura-

tion of the delay. Types of errors include

short circuit, low input voltage, over-

voltage shutdown, thermal shutdown,

or others that cause the output to

become unregulated. This function is

independent of the input voltage and

will function correctly with an output

voltage as low as 1V. Hysteresis is

included in both the reset and delay

comparators for noise immunity and to

prevent oscillations. A latching dis-

charge circuit is used to discharge the

delay capacitor, even when triggered by

a relatively short fault condition. This

circuit improves upon the commonly

used SCR structure by providing

improved noise immunity and full

capacitor discharge (0.2V typ).

Shutdown

Voltage

Over

Error

Amp

CS8128

SHUTDOWN

RESET

Sense

OUT

2000 South County Trail, East Greenwich, RI 02818

RESET

Sense

Delay

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

Cherry Semiconductor Corporation

Web Site: www.cherry-semi.com

Externally Set Delay for

Reset

60V Load Dump

Protection

Internal Thermal

Overload Protection

3% Output Accuracy

Active RESET

Noise Immunity

On Chip EMC Hardening

Protection Incorporated

Externally Set Current

Limit

Externally Set

Overvoltage Shutdown

Email: info@cherry-semi.com

Package Options

8L SO & 8L PDIP

Features

Pwr Gnd

SHUTDOWN

Ref Gnd

Company

OUT

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CS8128YD8 Summary of contents

Page 1

... Overvoltage Shutdown Package Options 8L SO & 8L PDIP OUT Sense 2 7 Pwr Gnd Delay SHUTDOWN 3 6 RESET Ref Gnd 4 5 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 A Company ® ...

Page 2

Power Dissipation.............................................................................................................................................Internally Limited Input Voltage ..................................................................................................................................................................–0.3V, 26V Transient Input Voltage ............................................................................................................................................................60V Output Current ...............................................................................................................................................Externally Limited ESD Susceptibility (Human Body Model)..............................................................................................................................2kV Junction Temperature ............................................................................................................................................–45°C to 150°C Storage Temperature..............................................................................................................................................–55°C to 150°C Lead Temperature Soldering Wave Solder (through hole styles only) .....................................................................................10 sec. ...

Page 3

PACKAGE LEAD # 8L SO & PDIP Typical Performance Characteristics (per Test Circuit) Temperature Performance of V OUT 5.02 I =500mA OUT 5.01 5.00V @ 25°C 5 4.99 4.98 4.97 4.96 4.95 ...

Page 4

V OUT RTH RESET ( Delay DTC V DTD The CS8128 function is very precise, has hysteresis RESET on both the and Delay comparators, a latching RESET Delay capacitor ...

Page 5

OUT (5V) C Delay 0.022µF RESET Overvoltage Shutdown The CS8128 includes an over voltage shutdown circuit which is activated by connecting the SHUTDOWN lead to the input. Shutdown typically occurs at 36V. Grounding the SHUTDOWN lead disables ...

Page 6

... REF: JEDEC MS-001 REF: JEDEC MS-012 Ordering Information Part Number Description CS8128YN8 8 Lead PDIP CS8128YD8 8 Lead SO Narrow CS8128YDR8 8 Lead SO Narrow (tape & reel) Rev. 2/5/99 Package Specification Thermal Data D English RΘ Min Max Min JC RΘ ...

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