© Semiconductor Components Industries, LLC, 2005

October, 2005 − Rev. 7

1

Publication Order Number:

CS5112/D

CS5112

1.4 A Switching Regulator

with 5.0 V, 100 mA Linear

Regulator with Watchdog,

RESET and ENABLE

The CS5112 is a dual output power supply integrated circuit. It

contains a 5.0 V

± 2%, 100 mA linear regulator, a watchdog timer, a

linear output voltage monitor to provide a Power On Reset (POR) and a

1.4 A current mode PWM switching regulator.

The 5.0 V linear regulator is comprised of an error amplifier,

reference, and supervisory functions. It has low internal supply current

consumption and provides 1.2 V (typical) dropout voltage at maximum

load current.

The watchdog timer circuitry monitors an input signal (WDI) from

the microprocessor. It responds to the falling edge of this watchdog

signal. If a correct watchdog signal is not received within the externally

programmable time, a reset signal is issued.

The externally programmable active reset circuit operates correctly

output voltage shifts below the regulation limit, RESET toggles low and

remains low for the duration of the delay after proper output voltage

regulation is restored. Additionally a reset pulse is issued if the correct

watchdog is not received within the programmed time. Reset pulses

continue until the correct watchdog signal is received. The reset pulse

width and frequency, as well as the Power On Reset delay, are set by one

external RC network.

The current mode PWM switching regulator is comprised of an error

amplifier with selectable feedback inputs, a current sense amplifier, an

adjustable oscillator, and a 1.4 A output power switch with

anti−saturation control. The switching regulator can be configured in a

variety of topologies.

The CS5112 is load dump capable and has protection circuitry which

includes current limit on the linear and switcher outputs, and an

overtemperature limiter.

Features

± 2% @ 100 mA

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

SOIC−24

DWF SUFFIX

CASE 751E

1

24

MARKING DIAGRAM

1

CS5112

AWLYYWWG

24

PIN CONNECTIONS

GND

GND

GND

GND

GND

GND

GND

GND

NC

NC

ENABLE

RESET

124

COMP

WDI

SELECT

Device

Package

ORDERING INFORMATION

CS5112YDWF24

SOIC−24

30 Units/Rail

CS5112YDWFR24

SOIC−24 1000/Tape & Reel

CS5112 = Device Code

A

= Assembly Location

WL

= Wafer Lot

YY

= Year

WW

= Work Week

G

= Pb−Free Package

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

CS5112YDWFR24G

SOIC−24

(Pb−Free)

1000/Tape & Reel

CS5112YDWF24G

SOIC−24

(Pb−Free)

30 Units/Rail

http://onsemi.com