LED Driver with Inductive Boost for Space-Constrained Backlighting

The SP6699 LED driver includes inductive-boost capabilities providing high efficiency for applications where LEDs must be tightly regulated to achieve uniform brightness.

Exar’s SP6699 features an integrated Schottky diode, is available in a 2.9mm x 2.8mm SOT23-6 package, and is capable of driving up to five series LEDs with only four external components, making it ideal for small display/keypad LED-lighting applications.

This LED driver is compatible with analogue dimming, PWM dimming up to 1kHz, and achieves a shutdown current of 3.2µA. The SP6699 operates from 2.5V up to 16V achieving 84% efficiency using a 0.2V feedback to minimise power loss. The 0.2V feedback is ±6% accurate over the full operating-temperature range. In addition, the SP6699 has an over-output voltage protection to ensure it cannot be damaged in the event of an open-circuited LED or a shorted feedback resistor.

 

FEATURES Drives two to five LEDs @ 20mA Up to 84% efficiency Integrated Schottky diode 1MHz switching frequency 200mV feedback voltage PWM dimming up to 1kHz Internal soft-start circuit SOT23-6 package

APPLICATIONS LCD module Keypad backlighting GPS receivers Digital camera equipment

 

 

• ROHM’s BD8109FM& BD8118FM, page 081127
• Avago’s ACPL-312T, page 081128

 

 

The SP6699EB evaluation board is available to members of the Future Board Club. To apply for the development board, and membership of the Board Club, go to www.my-boardclub.com/manf-offers.htm This offer is free and subject to qualification.

 

Exar / SP6699