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LM2792LD-L Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
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LM2792LD-L Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page LM2792 Current Regulated Switched Capacitor LED Driver with Analog Brightness Control General Description The LM2792 is a CMOS charge-pump voltage doubler and regulator that provides two regulated current sources. They are designed to drive two white (or blue) LEDs with matched currents (within ± 0.3%) to produce balanced light sources for display backlights. The LM2792 accepts an input voltage range from 3.0V to 5.8V and maintain a constant current determined by an external set resistor. The LM2792 delivers up to 34mA of load current to accom- modate two high forward voltage (typically white) LEDs. The switching frequency is 900kHz (min.) to keep the conducted noise spectrum away from sensitive frequencies within por- table RF devices. The LM2792 offers full off to maximum current control through the BRGT pin. The output current linearly tracks the BRGT pin voltage. The LM2792 is available in active high or low shutdown versions. The shutdown pin reduces the op- erating current to 1µA (max.). The LM2792 is available in a 10 pin leadless leadframe (LLP) CSP package. Features n Output matching of ± 0.3% (typ.) n Drives up to two LED’s n 3.0V to 5.8V Input Voltage n Up to 34mA output current n Soft start limits inrush current n Analog brightness control n Separate shutdown input n Very small solution size and no inductor n 1.4mA typical operating current n 1µA (max.) shutdown current n 900kHz 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 20024201 July 2002 © 2002 National Semiconductor Corporation DS200242 www.national.com |
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