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CS5231-3

500 mA, 3.3 V Linear Regulator with Auxiliary Control

ON Semiconductor 

CS5231−3

500 mA, 3.3 V Linear

Regulator with Auxiliary

Control

The CS5231−3 combines a three−terminal linear regulator with

circuitry controlling an external PFET transistor thus managing two

input supplies. The part provides a 3.3 V regulated output either from

the main 5.0 V supply or a 3.3 V auxiliary that switches on when the

5.0 V supply is not present. This delivers constant, uninterrupted

power to the load. The CS5231−3 meets Intel’s “Instantly Available”

power requirements which follows from the “Advanced Configuration

and Power Interface” (ACPI) standards developed by Intel, Microsoft

and Toshiba.

The CS5231−3 linear regulator provides a fixed 3.3 V output at

500 mA with an overall accuracy of ± 2.0%. The internal NPN−PNP

composite pass transistor provides a low dropout voltage and requires

less supply current than a straight PNP design. Full protection with

both current limit and thermal shutdown is provided.

Designed for low reverse current, the IC prevents excessive current

from flowing from VOUT to either VIN or ground when the regulator

input voltage is lower than the output voltage.

The CS5231−3 can be used to provide power to an ASIC on a PCI

Network Interface Card (NIC). When the system enters a Sleep State

and the 5.0 V input drops below 4.4 V, the AuxDrv control signal on the

CS5231−3 is activated turning on the external PFET. This switches the

supply source from the 5.0 V input to the 3.3 V input through the PFET,

guaranteeing a constant 3.3 V output to the ASIC that is “glitch free.”

The CS5231−3 is available in two package types: the D2PAK−5

(TO263) package and the SOIC−8 4−Lead−fused (DF) package. Other

applications include desktop computers, power supplies with multiple

input sources and PCMCIA/PCI interface cards.

Features

• Linear Regulator

− 3.3 V ± 2.0% Output Voltage

− 3.0 mA Quiescent Current @ 500 mA

− Fast Transient Response

− Current Limit Protection

− Thermal Shutdown with Hysteresis

− 450 mA Reverse Output Current

• System Power Management

− Auxiliary Supply Control

− “Glitch Free” Transition Between Two Supplies

• Internally Fused Leads in SOIC−8 Package

http://onsemi.com

1

5

8

1

D2PAK−5

DP SUFFIX

CASE 936AC

SOIC−8

DF SUFFIX

CASE 751

PIN CONNECTIONS AND

MARKING DIAGRAMS

D2PAK−5

CS5231−3

AWLYWW

1

Pin 1. No Connect

2. VIN

3. GND

4. VOUT

5. AuxDrv

Tab = GND

1 SOIC−8 8

NC

AuxDrv

GND

GND

GND

GND

VIN

VOUT

A

= Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

ORDERING INFORMATION

Device

Package

Shipping†

CS5231−3GDP5 D2PAK−5 50 Units/Rail

CS5231−3GDPR5 D2PAK−5 750 Tape & Reel

CS5231−3GDF8 SOIC−8

95 Units/Rail

CS5231−3GDFR8 SOIC−8 2500 Tape & Reel

†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.

© Semiconductor Components Industries, LLC, 2006

1

September, 2006 − Rev. 6

Publication Order Number:

CS5231−3/D

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