ACE714 Datasheet, PDF (1/8 Pages) ACE Technology Co., LTD. – High Efficiency Low Noise PFM Step-up DC/DC Converter

Technology
ACE714
High Efficiency Low Noise PFM Step-up DC/DC Converter
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
• Up to 24V Output Voltage
• Wide Operation Range: 2V to 6V
• Maximum 2MHz Operating Frequency
• PWM Dimming Control
• Shutdown Current <1uA
• Current Limit Cycle-by-Cycle
• Low Current Sense Threshold: 200mV
• 24V Over Output Voltage Protection
• Compact SOT-23-6 Package
Application
• Compact Back Light Module
• Power Source for LED
• Constant Current Source
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