Rev 09/24/02

SP6231 Evaluation Board Manual

Copyright Sipex Corporation

DESCRIPTION

The SP6231 Evaluation Board is designed to help the user evaluate the performance of

the SP6231 for use as a dual power source for applications like a DSC with USB port

power for downloading. The Evaluation Board operates from a 5V main supply which

can be from the on-board USB connector, providing a regulated 3.3V output at 500mA

or if that input is not present then from a 3.3V AUX switch input. The 3.3V AUX input is

available from an on-board option: Sipex’s SP6641B 2 Cell Battery Boost Converter to

3.3V auxiliary supply.

The SP6231 Evaluation Board can be used to provide glitch free transition between two

supplies. When the main power 5.0V input drops below 4.4V the auxiliary 3.3V is

switched to the output through the internal PFET. Thus, the SP6231 guarantees 3.3V

output “glitch free” operation.

Easy Evaluation for the SP6231 Linear

Regulator with Auxiliary Backup.

Evaluation Board provides complete,

ready to use solutions ideal for Digital

Still Camera (DSC) with USB port.

5.0 In, 3.3V Out, 500mA LDO.

Integrated Auxiliary Voltage Switch 0.2

Ω.

Glitch Free Transition between Two

Supplies: Battery or USB downloading.

Current Limit and Thermal Shutdown

Protection.

Fast Transient Response.

Applications: DSC, PCMCIA/PCI cards,

NIC Cards, Dual Power Systems.

SP6231EB

Evaluation Board Manual

SP6231REB SCHEMATIC

J2

AMP# 787616

1

2

3

4

80mohm

L1

10uH

6641 3.3V

USB CONNECTOR

1.8V to 3.3V

C6

1uF Cer.

L2 SM Bead

VAUX

SP6231 500MA LDO WITH AUX SWITCH

SHDN

D1

SCHOTTKY DIODE

J1

1

2

3

+5V

U1 SP6641B

1

2

4

5

3

LX

GND

SHDN

VBATT

VOUT

C3

2.2uF Cer.

GND

C5

0.1uF

VIN 5V

C4

10uF Cer.

C2

100uF

VOUT 3.3V

C1

100uF

SP6641B 2 CELL BOOST

VBATT

U2 SP6231

1

3

4

5

6

2

VAUX

GND

Vsense

Vin

Vout

GND

80mohm