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

switched output, I

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

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

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Input Voltage Range: 3.0V to 5.5V

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Regulated 5V Output

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250mA Output Current with a 3.6V input

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400mA Pulsed Output Current (up to 500ms duration)

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60µA (typ.) Quiescent Current

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PFM Regulation

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Inductor-less solution: requires only 3 small capacitors

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10-pin LLP Package (No Pullback):

3mm x 3mm x 0.75mm

Applications

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Cell Phone Camera Flash

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General Purpose Regulated Voltage Output, High

Current Supply

Typical Application Circuit

20140601

February 2005

© 2005 National Semiconductor Corporation

DS201406

www.national.com