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LM2753 датащи(PDF) 1 Page - National Semiconductor (TI) |
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LM2753 датащи(HTML) 1 Page - National Semiconductor (TI) |
1 / 8 page LM2753 High Power Switched Capacitor Voltage Convertor/Flash LED Driver General Description The LM2753 is capable of driving a Flash LED with a pulsed current of 400mA at an input voltage of 3.6V. A switched capacitor doubler, the LM2753 provides a regulated 5V out- put (V OUT) over an input supply range of 3.0V to 5.5V. The switched output, I OUT, takes less than 10ns to turn on and provide maximum current to a Flash LED. Flash LED current is set via a ballast resistor. Continuous illumination current (Torch Mode) is programmed by connecting a resistor be- tween I OUT and VOUT. This device uses only three small, low-cost ceramic capacitors. LM2753 uses Pulse Frequency Modulation (PFM) regula- tion. Typical operating frequency is 725kHz. Under no-load conditions, LM2753 operates on only 60µA. If the output is connected to ground, the charge pump stays in the gain of 1 which helps limit the input current to 300mA (typ.) LM2753 is available in a 10-pin No Pullback Leadless Lead- frame Package: LLP-10. Features n Input Voltage Range: 3.0V to 5.5V n Regulated 5V Output n 250mA Output Current with a 3.6V input n 400mA Pulsed Output Current (up to 500ms duration) n 60µA (typ.) Quiescent Current n PFM Regulation n Inductor-less solution: requires only 3 small capacitors n <1µA Typical Shutdown Current n 10-pin LLP Package (No Pullback): 3mm x 3mm x 0.75mm Applications n Cell Phone Camera Flash n General Purpose Regulated Voltage Output, High Current Supply Typical Application Circuit 20140601 February 2005 © 2005 National Semiconductor Corporation DS201406 www.national.com |
Аналогичный номер детали - LM2753 |
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Аналогичное описание - LM2753 |
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