Conceptual

CS902-A-R

www.richtek.com

June 13, 2013

3

32

VSUP

VDD of OPAMP.

33

EN

Chip enable

34

VGH

Output sensing pin for the VGH positive charge pump and power input

voltage pin for the GPM.

35

VGHM

Switch output for gate shaping function.

36

RE

Discharge pin for gate shaping function.

37

OUTB1

Output sensing pin of the VI/O buck converter.

38,39

LXB1

Switch pins of the VI/O buck converter.

40

BOOT1

N-channel MOSFET gate drive voltage for the VI/O buck converter.

Connect a capacitor from the switch node LXB1 to this pin.

41

Exposed Pad

The Exposed Pad should be soldered to a large PCB and connected to

PGND for maximum thermal dissipation.