© Semiconductor Components Industries, LLC, 2006

September, 2006 − Rev. 10

1

Publication Order Number:

CS5257A−1/D

CS5257A−1

7.0 A LDO 5−Pin Adjustable

Linear Regulator

This new very low dropout regulator is designed to power the next

generation of advanced microprocessors. To achieve very low

dropout, the internal pass transistor is powered separately from the

control circuitry. Furthermore, with the control and power inputs tied

together, this device can be used in single supply configuration and

still offer a better dropout voltage than conventional PNP−NPN based

LDO regulators. In this mode the dropout is determined by the

minimum control voltage.

allowing for the implementation of a remote−sense pin permitting

very accurate regulation of output voltage directly at the load, where it

counts, rather than at the regulator. This remote sensing feature

virtually eliminates output voltage variations due to load changes and

resistive voltage drops. Typical load regulation measured at the sense

pin is 1.0 mV for an output voltage of 2.5 V with a load step of 10 mA

to 7.0 A.

The very fast transient loop response easily meets the needs of the

latest microprocessors. In addition, a small capacitor on the Adjust pin

will further improve the transient capabilities.

Internal protection circuitry provides for “bust−proof” operation,

similar to three−terminal regulators. This circuitry, which includes

overcurrent, short circuit, supply sequencing and overtemperature

protection will self protect the regulator under all fault conditions.

The CS5257A−1 is ideal for generating a secondary 2.0 V − 2.5 V

low voltage supply on a motherboard where both 5.0 V and 3.3 V are

already available.

Features

MARKING DIAGRAMS

A

= Assembly Location

WL, L

= Wafer Lot

YY, Y

= Year

WW, W = Work Week

TO−220−5

T SUFFIX

CASE 314D

2. Adjust

1

5

CS5257A−1

AWLYWW

1

Device

Package

ORDERING INFORMATION

CS5257A−1GT5

TO−220−5

50 Units/Rail

DP SUFFIX

CASE 936AC

1

5

CS

5257A−1

AWLYWW

1

TO−220−5

CS5257A−1GDP5

50 Units/Rail

CS5257A−1GDPR5

750 Tape & Reel

http://onsemi.com

†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.