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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 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 V

OUT

. 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 60碌A(chǔ). 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

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)

60碌A(chǔ) (typ.) Quiescent Current

PFM Regulation

Inductor-less solution: requires only 3 small capacitors

<

1碌A(chǔ) 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

20140601

漏 2005 National Semiconductor Corporation

DS201406

www.national.com

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