SC4539 Datasheet (Semtech Corporation) - High Effi ciency Boost Converter

SC4539, High Effi ciency Boost Converter

The SC4539 is designed to regulate current for a series chain of white LEDs in LCD backlighting applications where small size and high efficiency are priorities.

This device integrates an 800kHz current-mode PWM boost converter and a 30mA programmable low dropout current sink regulator.

An external

SC4539 Features

* Input voltage range

* 2.8V to 5.5V Current-mode PWM control

* 800kHz

* Programmable LED current up to 30mA

* Soft-start to reduce in-rush current

* PWM dimming

* 100Hz to 50kHz

* PWM dimming at ISET

* Analog and filtered

* Over-