3

Date: 7/6/06 Rev B

SP6685, 700mA Buck/BoostCharge Pump LED Driver

© 2006 Sipex Corporation

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

Input Voltage for the charge pump. Decouple with 4.7μF ceramic

capacitor close to the pins of the IC.

2

C1

Positive input for the external fly capacitor. Connect a ceramic 1μF

capacitor close to the pins of the IC.

3

C2

Negative input for the external fly capacitor. Connect a ceramic 1μF

capacitor close to the pins of the IC.

4

FLASH

Logic input to toggle operation between FLASH and TORCH mode.

In TORCH mode FB is regulated to the internal 50mV reference. In

FLASH mode FB reference voltage can be adjusted by changing the

5

EN

to ground for shutdown.

Connect a resistor from this pin to ground. When in FLASH mode

(FLASH = High) this resistor sets the current regulation point

7

FB

Feedback input for the current control loop. Connect directly to the

current sense resistor.

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

Power ground pin. Fly capacitor current returns through this pin.

10

Charge Pump Output Voltage. Decouple with an external capacitor.

At least 1μF is recommended. Higher capacitor values reduce output

ripple.