Features • Up to 700 mA Output Current • Ultra-Small Solution Size • —No Inductor, Only 4 Capacitors and a resistor Required • —1.514 mm x 1.996 mm x 0.6 mm thin micro SMD package • 90% Peak Efficiency • Indicator, Torch and Flash Modes • Time-Out Circuitry Limits Flash Duration to 814 msec. (typ.) • Adaptive 1x and 1.5x Gains for Maximum Efficiency • True Shutdown • Internal Soft-Start Eliminates Inrush Current Description LM2758 is an integrated low-noise, high-current switched capacitor DC/DC converter with a regulated current sink. The device is capable of driving loads up to 700 mA from a single-cell Li-Ion battery. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage and current requirements. One external low-power resistor sets the desired current for Indicator, Torch and Flash modes. To protect the devices and the flash LED, internal Time-out circuitry turns off the LM2758 in case of a faulty prolonged Flash mode. Internal soft-start circuitry limits the amount of inrush current during start-up. LM2758 is offered in National’s tiny 12-bump thin micro SMD package. Applications • Camera Flash in Mobile Phones • Flash for Digital Cameras

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Typical Application click for larger image typ application circuit - simple	Block Diagram click for larger image revised Block Diagram
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Datasheet

Title		Size	Date	Other Language
	LM2758 Switched Capacitor Flash LED Driver in micro SMD	1003 Kbytes	9-Oct-09	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1695: Application Note 1695 LM2758 Flash LED Driver Evaluation Board	347 Kbytes	9-Apr-08

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Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2758TL	CMOS7	0	18406	0	0	1089000	4	309006723
LM2758TLX	CMOS7	0	18406	0	0	1089000	4	309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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