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LM2791LDX-H Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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LM2791LDX-H Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page 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 accom- modate two high forward voltage (typically white) LEDs. The switching frequency is 450kHz (min.) to keep the conducted noise spectrum away from sensitive frequencies within por- table RF devices. In the LM2791, brightness is controlled by applying a voltage between GND and 3.0V to the BRGT pin. The LM2791 is available in active high or low shutdown versions. The shut- down pin reduces the operating current to 1µA (max.). The LM2791 is available in a 10 pin leadless leadframe (LLP) CSP package. Features n Output matching of ± 0.3% n Drives up to two LED’s n 3V to 5.8V Input Voltage n Up to 36mA output current n Soft start limits inrush current n Analog brightness control n Separate shutdown input n Very small solution size - no inductor n 0.7mA typical operating current n 1µA (max.) shutdown current n 450kHz switching frequency (min.) n Linear regulation generates predictable noise spectrum n LLP-10 package: 3mm X 3mm X 0.8mm Applications n White LED Display Backlights n White LED Keypad Backlights n 1-Cell Li-Ion battery-operated equipment including PDAs, hand-held PCs, cellular phones n Flat Panel Dispalys Basic Application Circuit 20018301 July 2002 © 2002 National Semiconductor Corporation DS200183 www.national.com |
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