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LM2759SDX датащи(PDF) 1 Page - National Semiconductor (TI) |
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LM2759SDX датащи(HTML) 1 Page - National Semiconductor (TI) |
1 / 14 page LM2759 June 10, 2010 1A Switched Capacitor Flash LED Driver with I2C Compatible Interface General Description LM2759 is an integrated low-noise, high-current switched ca- pacitor DC/DC converter with a regulated current source. The device requires only four small ceramic capacitors making the total solution area less than 22 mm2 and the height less than 1 mm. The LM2759 is capable of driving loads up to 1A from a single-cell Li-Ion battery. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage and current require- ments. The LED current can be programmed up to 1A via an I2C- compatible interface, along with eight selectable Flash Time- Out durations. One high-current Flash LED can be driven either in a high-power Flash mode or a low-power Torch mode. The Strobe pin allows the flash to be toggled via a Flash enable signal from a camera module. The TX input pin limits the Flash LED current to the Torch current level during a RF PA pulse, to reduce high loads on the battery. Internal soft-start circuitry limits the amount of inrush current during start-up. LM2759 is offered in a small 12-pin thermally enhanced LLP package. Features ■ Up to 1A Output Current ■ Solution Area < 22 mm2 ■ No Inductor Required ■ 90% Peak Efficiency ■ Adaptive 1x, 1.5x and 2x Gains for Maximum Efficiency ■ Load Disconnect in Shutdown ■ Accurate Input Current Control During Gain Transitions ■ Flash Time-Out ■ TX Input Pin Ensures Synchronization with RF Power Amplifier Pulse ■ Torch, Flash, and Indicator Modes ■ External Flash Enable via Strobe Input Pin ■ Strobe Input Disable via I2C ■ Programmable Flash Pulse Duration, and Torch and Flash Currents via I2C-Compatible Interface ■ 1MHz Constant Frequency Operation ■ Low Profile 12–Pin LLP (3mm x 3mm x 0.8mm) Applications ■ Camera Flash in Cellular Phones Typical Application Circuit 30069301 30069322 © 2010 National Semiconductor Corporation 300693 www.national.com |
Аналогичный номер детали - LM2759SDX |
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Аналогичное описание - LM2759SDX |
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