3

Device pinout

Pin name

Pin location

Pin function

VSSA

C4,C5,D3,D4,

D5,E5,F5,F6,

G6,G7

Analog ground. Power return for the main LDO and the analog circuitry.

VSSD

E4, F3, F4, G2, G3,

G4, H3, H4, H5, H6,

H7

Digital ground. Reference for digital input and output signals.

VSSP

A1, A8, B1, B8

Power ground. Power return for the synchronous rectifier.

AC1

A6, A7, B6, B7

AC power input: input of the synchronous rectifier. Connect to RX series resonant

circuit.

AC2

A2, A3, B2, B3

AC power input: input of the synchronous rectifier. Connect to RX series resonant

circuit.

BOOT1

E7

Synchronous rectifier bootstrap capacitor connection: a 47 nF (typ.) ceramic capacitor

is connected between this pin and AC1.

BOOT2

C1

Synchronous rectifier bootstrap capacitor connection: a 47 nF (typ.) ceramic capacitor

is connected between this pin and AC2.

BOOT

E8

Main LDO power transistor bootstrap capacitor. Connect a 4.7 nF (typ.) ceramic

capacitor between this pin and VRECT.

STWLC68

Device pinout

DS13131 - Rev 3

page 4/32