PGND

GND

CS

100

W

0.1

mF

CS

0.1

mF

470 pF

1.5 k

W

2.5 k

W

0.1

mF

100

mF × 2

3.3 V @ 3 A

L

4.7

mH

MBRS360

5.0 V−12 V

47

mF

IRF7416

Figure 1. Typical Application Diagram

© Semiconductor Components Industries, LLC, 2005

October, 2005 − Rev. 11

1

Publication Order Number:

CS51031/D

CS51031

Fast P−Ch FET

Buck Controller

The CS51031 is a switching controller for use in DC−DC

converters. It can be used in the buck topology with a minimum

monitor for controlling the state of the device, 1.0 A power driver for

controlling the gate of a discrete P−Channel transistor, fixed frequency

oscillator, short circuit protection timer, programmable Soft−Start,

precision reference, fast output voltage monitoring comparator, and

output stage driver logic with latch.

The high frequency oscillator allows the use of small inductors and

output capacitors, minimizing PC board area and systems cost. The

programmable Soft−Start reduces current surges at startup. The short

circuit protection timer significantly reduces the duty cycle to

approximately 1/30 of its cycle during short circuit conditions.

Features

°C to 85°C

°C to 70°C

PIN CONNECTIONS

51031 = Device Code

A

= Assembly Location

L

= Wafer Lot

Y

= Year

W

= Work Week

x

= Continuation of Device Code

x = Y or G

G

= Pb−Free Package

SOIC−8

D SUFFIX

CASE 751

1

8

MARKING DIAGRAM

GND

CS

PGND

1

http://onsemi.com

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

ORDERING INFORMATION

51031

ALYWx

G

1

8