Rev 10/17/05

SP6655 Evaluation Board Manual

Copyright © Sipex Corp.

DESCRIPTION

The SP6656 Evaluation Board is designed to help the user evaluate the performance

of the SP6656 for use as a single Li-Ion battery Step-Down DC-DC Converter. The

SP6656 operates from 2.7V to 6.5V input, with the highest efficiency in the range 3.0V

to 4.2V where the Li-Ion battery has the most energy. The SP6656EB evaluation board

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

Converter performance.

FIGURE 1. SP6656 1.8V OUTPUT EVALUATION BOARD SCHEMATIC

Vin = 2.7V to 5.0V

RVIN

10.0

RI

200K

CVIN

1.0uF

OVSO

2

1

3

SP6656

U1

PVin

1

Vin

2

OVSO

3

OVSI

4

EN

5

FB

6

Vout

7

GND

8

PGND

9

LX

10

OVSI

L1

10uH

RF

249K

CF

120pF

CIN

10uF

COUT

10uF

1

2

EN

Vout = 1.8V (OVSI=L) or 2.8V (OVSI=H)

3

Rs

200K

USING THE EVALUATION BOARD

High Efficiency Synchronous

Step-Down Converter with up to

98% efficiency

400mA Output Current, only

20uA Quiescent Current

2.9V-5.5V Input Voltage range,

Output Adjustable down to 1.0V

Small 2.5x2.4mm DFN Package

& Ceramic Capacitors for small,

low profile Power Supply

Ideal for PDAs, Digital Cameras,

Wireless Modems, Cellular

Telephones

SP6656EB

Evaluation Board Manual