3

Date: 7/20/05

SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator

© Copyright 2005 Sipex Corporation

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

Battery Voltage. The startup circuitry is powered by this pin. Battery

goes into an undervoltage lockout mode (UVLO), where the part is shut

down.

2

FLASH

Reference Control Input. Internal Reference defaults to 0.8V if FLASH

= LOW and 0.288V if FLASH = HIGH.

3

NC (Test)

No connection. This pin is bonded out for test purposes only and

must be left floating in all applications.

5

SHDN

this pin to ground to disable all circuitry inside the chip.

6FB

Feedback. Connect this pin to GND for fixed +5V operation. Connect

adjustable output operation.

7

GND

Ground. Connect to ground plane.

8

PGND

Power Ground. The inductor charging current flows out of this pin.

9LX

Inductor Switching Node. Connect one terminal of the inductor to the

positive terminal of the battery. Connect the second terminal of the

inductor to this pin. The inductor charging current flows into LX,

through the internal charging N-channel FET, and out the PGND pin.

10

Output Voltage. The inductor current flows out of this pin during

switch off-time. It is also used as the internal regulator voltage supply.

Connect this pin to the positive terminal of the output capacitor.