Rev 08/29/05

SP6659 Evaluation Board Manual

Copyright Sipex Corporation

DESCRIPTION

The SP6659 Evaluation Board is designed to help the user evaluate the performance

of the SP6659 for use as a single Li-Ion battery Step-Down DC-DC Converter. The

SP6659 operates from 2.5V to 5.5V input, with the highest efficiency in the range 3.0V

to 4.2V where the Li-Ion battery has the most energy. The SP6659EB evaluation board

is a complete power supply circuit to provide ease of evaluation for the DC/DC

Converter performance.

FIGURE 1. SP6659 1.8V OUTPUT EVALUATION BOARD SCHEMATIC

R1

200K

R2

100K

L1 2.2 uH

COUT

10uF

CIN

4.7uF

U1

SP6659

VIN

4

GND

2

SW

3

RUN

1

VFB

5

CF

100pF

J1

1

2

3

VFB=0.6V

Vin=2.5-5.5V

Vout=1.8V

Synchronous Buck regulator with

up to 94% efficiency

1.5MHz Constant frequency

operation

600mA Output Current

2.5V-5.5V Input Voltage range,

0.6V reference allow low output

voltage

No Schottky diode required

Current mode operation

Over-temperature protected

Low profile SOT23-5 Package &

Ceramic Capacitors for small,

low profile Power Supply

Ideal for PDAs, Digital Cameras,

Wireless Modems, Cellular

Telephones

SP6659EB

Evaluation Board Manual