2

USING THE EVALUATION BOARD

1) Powering up the SP6652 Circuit & Programming the UVLO threshold

The SP6652 Evaluation Board can be powered from a single Li-Ion battery or a +2.7 to

+5.0V power supply. Connect with short leads directly to the “Vin” and “Gnd” posts.

Note the SP6652 will remain in “shutdown” until SD pin Jumper J1 is applied to the VIN

position pin 1 to 2.

2) VOUT PROGRAMMING

The SP6652 requires 2 feedback resistors to control the output voltage. Connect the

appropriate resistors RF and RI (Table 2) from pin 3 SP6652 FB to Vout and to the

GND.

For Vout different from that shown in the schematic, use equation:

RI

Vout

RF

•













−

=

1

80

.

0

SP6652EB BILL OF MATERIALS

Component

Vo = 3.3V

L1

4.7uH, W urth Elektronik 744042004, 0.07ohm, 1.7A, 4.8x4.8x1.8mm

CIN

10uF, TDK C2012X5R0J106M, 0.005ohm, 6.3V, X5R, 0805

COUT

10uF, TDK C2012X5R0J106M, 0.005ohm, 6.3V, X5R, 0805

CVIN

1uF, TDK C1608X5R0J105M, 0.03ohm, .3V, X5R, 0603

Cc

10nF ceramic, 0603

RVIN

10 Ohm 5%, 0603

RI

200k 1%, 0603

RF

634k 1%, 0603

Rz

4.02k 1%, 0603

U1

SP6652EU, 10 pin uSOIC