LM2753

LM2753 High Power Switched Capacitor Voltage Convertor/Flash LED Driver February 2005 LM2753 High Power Switched Capacitor Voltage Convertor/Flash www.datasheet4u.com 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 output (VOUT) over an input supply range of 3.0V to 5.5V. The switched output, IOUT, 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 between IOUT and VOUT. This device uses only three small, low-cost ceramic capacitors. LM2753 uses Pulse Frequency Modulation (PFM) regulation. 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 Leadframe Package: LLP-10. Features n n n n n n n n n Input Voltage Range: 3.0V to 5.5V Regulated 5V Output 250mA Output Current with a 3.6V input 400mA Pulsed Output Current (up to 500ms duration) 60µA (typ.) Quiescent Current PFM Regulation Inductor-less solution: requires only 3 small capacitors < 1µA Typical Shutdown Current 10-pin LLP Package (No Pullback): 3mm x 3mm x 0.75mm Applications n Cell Phone Cam...