© Semiconductor Components Industries, LLC, 2001

January, 2001 – Rev. 9

1

Publication Order Number:

CS5111/D

CS5111

1.4 A Switching Regulator

with 5.0 V, 100 mA Linear

Regulator with Watchdog,

RESET and ENABLE

The CS5111 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 CS5111 is load dump capable and has protection circuitry

which includes overvoltage shutdown, current limit on the linear and

switcher outputs, and an overtemperature limiter.

Features

– 5.0 V

± 2% @ 100 mA

– 1.4 A Peak Internal Switch

– 120 kHz Maximum Switching Frequency

– 5.0 V to 26 V Operating Supply Range

– Watchdog

– RESET

– ENABLE

– Overvoltage

– Overtemperature

– Current Limit

http://onsemi.com

SO–24L

DWF SUFFIX

CASE 751E

1

24

A

= Assembly Location

WL, L

= Wafer Lot

YY, Y

= Year

WW, W = Work Week

MARKING

DIAGRAM

1

CS5111

AWLYYWW

24

PIN CONNECTIONS

GND

GND

GND

GND

GND

GND

GND

GND

NC

NC

ENABLE

RESET

124

COMP

WDI

SELECT

Device

Package

Shipping

ORDERING INFORMATION

CS5111YDWF24

SO–24L

31 Units/Rail

CS5111YDWFR24

SO–24L

1000 Tape & Reel