ACE714

High Efficiency Low Noise PFM Step-up DC/DC Converter

VER 1.2

1

 

Description

The ACE714 PFM step-up Converter drives white LEDs with a constant current to provide backlight in

cell phones, PDAs, and other handheld devices. It features allowing series connection of the white LEDs

so that the LED currents are identical for uniform brightness. An enable input can be pulsed repeatedly to

adjust LEDs brightness. The fast 500HKz to 2MHz operation frequency allows for smaller capacitor and

inductor. Fault condition protection uses cycle-by cycle current limiting to sense maximum inductor

current and over-voltage protection. The 0.2V low reference voltage minimized the power loss across the

current sense resistor.

The converter can operate from 2V to 6V, and capable of delivering maximum 200mA output current at

4-LEDs application with 3V input voltage is as low as 120uA. All of these features make ACE714 be

suitable for the portable devices, which are supplied by a single battery.

ACE714 is available in SOT-23-6 package that is PB free.

 

Features

Application