DESCRIPTION

The SP6655 Evaluation Board is designed to help the user evaluate the performance

of the SP6655 for use as a single Li-Ion battery Step-Down DC-DC Converter. The

SP6655 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 SP6655EB evaluation board

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

Converter performance.

FIGURE 1. SP6655 1.8V OUTPUT EVALUATION BOARD SCHEMATIC

RVIN

10.0

RI

200K

CVIN

1.0uF

2

1

3

SP6655

U1

PVin

1

Vin

2

BLON

3

D1

4

D0

5

FB

6

Vout

7

GND

8

PGND

9

LX

10

D1

L1

10uH

RF

249K

CF

22pF

CIN

10uF

COUT

10uF

Vin = 2.7V to 5.0V

2

1

3

BLON

D0

Vout = 1.8V

High Efficiency Synchronous

Step-Down Converter with up to

98% efficiency

400mA Output Current, only

20uA Quiescent Current

2.7V-6.5V Input Voltage range,

Output Adjustable down to 0.8V

DFN Package & Ceramic

Capacitors for small, low profile

Power Supply

Ideal for PDAs, Digital Cameras,

Wireless Modems, Cellular

Telephones

SP6655EB

Evaluation Board Manual