Date: 02/18/05

SP6654 Evaluation Board Manual

Copyright Sipex Corporation

DESCRIPTION

The SP6654 Evaluation Board is designed to help the user evaluate the performance

of the SP6654 for use as a single Li-Ion battery Step-Down DC-DC Converter. The

SP6654 operates from 2.7V to 5.5Vinput, with the highest efficiency in the range 3.0V to

4.2V where the Li-Ion battery has the most energy. The SP6654EB evaluation board is

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

performance.

FIGURE 1. SP6654 3.3V OUTPUT EVALUATION BOARD SCHEMATIC

COUT

22uF

CIN

22uF

CVIN

1.0uF

Vout 3.3V 800mA

1

L1

10uH

D0

PWRGD

RVIN

10.0

SP6654

U1

PVin

1

Vin

2

PWRGD

3

D1

4

D0

5

FB

6

Vout

7

GND

8

PGND

9

LX

10

Vin 2.7 - 5.5VDC

CF

22pF

RI

261K

3

1

2

RF

825K

D1

3

2

SP6654EB

Evaluation Board Manual

High Efficiency

Synchronous Step-Down

Converter with up to

98% efficiency

800mA Output Current,

only 20uA Quiescent

Current

2.7V-6.5V Input Voltage

range, Output Adjustable

down to 0.8V

µSOIC Package & DFN

Ceramic Capacitors for

small, low profile Power

Supply