3

Date: 03/10/06

SP6686 400mA, Buck/Boost Charge Pump LED Driver

© Copyright 2006 Sipex Corporation

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

Input Voltage for the charge pump. Decouple with 2.2µF ceramic

capacitor close to the pins of the IC.

2C1

Positive input for the external fly capacitor. Connect a ceramic 0.47µF

capacitor close to the pins of the IC.

3C2

Negative input for the external fly capacitor. Connect a ceramic

0.47µF 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

5EN

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

7FB

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 1uF is recommended. Higher capacitor values reduce output

ripple.