LM2753 Datasheet | National Semiconductor

LM2753 High Power Switched Capacitor Voltage Convertor/Flash LED Driver February 2005 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 400m A 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 725k Hz. 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 300m A (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 250m A Output Current with a 3.6V input 400m A 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 Camera Flash n General Purpose Regulated Voltage Output, High Current Supply Typical Application Circuit © 2005 National Semiconductor Corporation DS201406 .national. Connection Diagram LM2753 10-Pin LLPPackage (LLP10) No Pullback 3mm X 3mm x 0.75mm NS Package Number SDA10A .. Pin Descriptions Pin # 1 2 3 4 5 6 7 8 9 10 Name C1+ VIN C1FLASH GND EN GND IOUT VOUT GND Flying capacitor connection. Input Voltage Connection. Input Voltage Range:...