3

Table 2. SP6654EB BILL OF MATERIALS

Table 3. SP6654 PIN ASSIGNMENT

Pin

Name

Pin Description

Pin

NO.

PVin

Input voltage power pin. Inductor charging current passes

through this pin.

1

Vin

Internal supply voltage. Control circuitry powered from this

pin.

2

PWRGD

Open drain battery low output – need to pullup to supply

externally. Vout below threshold pulls this node to ground.

Vout above threshold, this node is open.

3

D1

Digital mode control input. See Table 1 for definition.

4

D0

Digital mode control input. See Table 1 for definition.

5

FB

External feedback network input connection. Connect a

resistor from FB to ground and FB to Vout to control the

output voltage. This pin regulates to the internal reference

voltage of 0.8V.

6

Vout

Output voltage sense pin. Used for internal timing and BLON

circuitry.

7

GND

Internal ground pin. Control circuitry returns current to this pin.

8

PGND

Power ground pin. Synchronous rectifier current returns

through this pin.

9

LX

Inductor switching node. Inductor tied between this pin and

the output capacitor to create Vout.

10

Component

Vo = 3.3V

Vo = 1.5V

L1

10uH, CDRH5D28-100, Sumida 10uH, CDRH5D28-100, Sumida

CIN

22uF, TDK C3225X5R0J226M

22uF, TDK C3225X5R0J226M

COUT

22uF, TDK C3225X5R0J226M

22uF, TDK C3225X5R0J226M

RVIN

10 Ohm 5%

10 Ohm 5%

CVIN

1uF ceramic X7R SM 0805

1uF ceramic X7R SM 0805

RI

261k 1%

261k 1%

RF

825k 1%

226k 1%

CF

22pF ceramic

22pF ceramic

U1

SP6654EU or SP6654ER

SP6654EU or SP6654ER