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SPX2975R5-5.0

400mA Low Dropout Voltage Regulator

Signal Processing Technologies 

FUNCTIONAL DIAGRAM

Temperature

Sensor

Current

Limit

VIN 1

Bandgap

Reference

RD 4

Saturation

Control &

Protection

Circuit

Buffer

5 VOUT

Reset

Generator

2 RO

3

GND

PIN DESCRIPTION

PIN NUMBER

1

2

3

4

5

PIN NAME

VIN

RO

GND

RD

VOUT

DESCRIPTION

LDO Input. Bypass VIN to GND with a Ceramic capacitor.

Reset Output. RO remains low while VOUT is below the reset switching

threshold. RO is in open conector output.

Ground. This pin also functions as a heatsink. Solder to large pads or the

circuit-board ground plane to maximize thermal dissipation.

Reset Delay. RD connects capacitor to GND for setting delay time.

LDO Output. Bypass VOUT to GND with a minimum 22µF capacitor with

ESR less than 5Ω at 10kHz.

VI

VQ

VD

VRO t rd

t RR

t

<t rr

VQ, rt

dV = ID

dt CD

t

VDU

VDRL

t

Power on

Reset

Reset Timing

Date: 1/17/05

t

Thermal Voltage Dip Undervoltage

Shutdown at Input

Secondary Overload

Spike

at Output

SPX2975 400mA Low Dropout Voltage Regulator

3

© Copyright 2005 Sipex Corporation

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