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Date: 5/25/04

SP6231 500mA, 3.3V Linear Regulator

© Copyright 2004 Sipex Corporation

FEATURES

Characteristics (also available in NSOIC)

■ “Glitch Free” Transition between Two Supplies

■ 3.3V Fixed LDO Output Voltage

■ 400µA Quiescent Current @500mA Load

■ Fast Transient Response

■ Current Limit Protection

■ Thermal Shutdown Protection with Hysteresis

■ Auxiliary Supply Control

■ Internal 0.2Ω PFET Switch Eliminates External

FETs

■ Kelvin Connection with 3.3V Feedback

500mA, 3.3V Linear Regulator with Auxiliary Backup

SP6231

DESCRIPTION

APPLICATIONS

■ USB Peripherals

■ NIC Cards

■ PCMCIA/PCI Cards

■ Desktop Computers

■ Dual Power Systems

®

The SP6231 is a 500mA, 3.3V LDO with an integrated auxiliary voltage input switch. During

normal operation, the SP6231 acts as a standard LDO with an output voltage of 3.3V delivering

through an internal PFET, maintaining a constant “glitch free” output voltage.

The SP6231 is ideally suited for NIC cards and portable battery powered equipment. When a

desktop computer reverts to sleep mode, its 5V bus is removed, leaving only the 3.3V bus. The

SP6231’s auxiliary output passes the 3.3V bus through, keeping the NIC card available for any

Wake-On-LAN command. In battery powered applications, the SP6231 draws power from any

available 5V USB connection and reverts to battery power when the USB power is removed.

@ 500mA

SP6231

GND

OUT

+5V USB

C2

2.2µF

GND

GND

C1

2.2µF

C3

10µF

TYPICAL APPLICATION CIRCUIT

Now Available in Lead Free Packaging

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2

3

4

5

6

7

8

SP6231

8 Pin NSOIC

GND

GND

GND

GND