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LM2791 - Current Regulated Switched Capacitor LED Driver

General Description

The LM2791 is a CMOS charge-pump voltage doubler and regulator that provides two regulated current sources.

The LM2791 is designed to drive two white (or blue) LEDs with matched currents (within ± 0.3%) to produce balanced light sources for display backlights.

Key Features

  • n n n n n n n n n n n n n Output matching of ± 0.3% Drives up to two LED’s 3V to 5.8V Input Voltage Up to 36mA output current Soft start limits inrush current Analog brightness control Separate shutdown input Very small solution size - no inductor 0.7mA typical operating current 1µA (max. ) shutdown current 450kHz switching frequency (min. ) Linear regulation generates predictable noise spectrum LLP-10 package: 3mm X 3mm X 0.8mm.

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LM2791 Current Regulated Switched Capacitor LED Driver with Analog Brightness Control July 2002 LM2791 Current Regulated Switched Capacitor LED Driver with Analog Brightness Control General Description The LM2791 is a CMOS charge-pump voltage doubler and regulator that provides two regulated current sources. The LM2791 is designed to drive two white (or blue) LEDs with matched currents (within ± 0.3%) to produce balanced light sources for display backlights. They accept an input voltage range from 3V to 5.8V and maintain a constant current determined by an external set resistor. The LM2791 delivers up to 36mA of load current to accommodate two high forward voltage (typically white) LEDs. The switching frequency is 450kHz (min.