SC4539 Datasheet - Semtech Corporation

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SC4539 High Effi ciency Boost Converter

SC4539 High Efficiency Boost Converter for up to 6 LEDS POWER MANAGEMENT .
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.

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Datasheet Details

Part number:

SC4539

Manufacturer:

Semtech Corporation

File Size:

286.07 KB

Description:

High Effi ciency Boost Converter

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-

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 resistor sets the LED current up to 30mA. PWM dimming (100Hz to 50kHz) may be applied directly to the enable

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