1

DESCRIPTION

The SP6651A Evaluation Board is designed to help the user evaluate the performance

of the SP6651A for use as a single Li-Ion battery Step-Down DC-DC Converter. The

SP6651A 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 SP6651A evaluation board

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

Converter performance.

FIGURE 1. SP6651A 3.3V OUTPUT EVALUATION BOARD SCHEMATIC

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

MSOP Package & Ceramic

Capacitors for small, low profile

Power Supply

Ideal for PDAs, Digital Cameras,

Wireless Modems, Cellular

Telephones

SP6651EB

Evaluation Board Manual

BLON

D0

CVIN

1.0uF

RVIN

10.0

SP6651A

U1

1

2

3

4

5

6

7

8

9

10

PVin

Vin

BLON

D1

D0

FB

Vout

GND

PGND

LX

3

J2

L1

10uH

CIN

22uF

1

1

2

CF

22pF

3

D1

RI

261K

COUT

22uF

Vout 3.3V 800mA

RF

825K

2

Vin 2.7 - 6.5VDC

J1