Features • Up to 1A Output Current • Solution Area < 22 mm 2 • No Inductor Required • 90% Peak Efficiency • Adaptive 1x, 1.5x and 2x Gains for Maximum Efficiency • Load Disconnect in Shutdown • Accurate Input Current Control During Gain Transitions • Flash Time-Out • TX Input Pin Ensures Synchronization with RF Power Amplifier Pulse • Torch, Flash, and Indicator Modes • External Flash Enable via Strobe Input Pin • Strobe Input Disable via I 2C • Programmable Flash Pulse Duration, and Torch and Flash Currents via I 2C-Compatible Interface • 1MHz Constant Frequency Operation • Low Profile 12–Pin LLP (3mm x 3mm x 0.8mm) Description LM2759 is an integrated low-noise, high-current switched capacitor DC/DC converter with a regulated current source. The device requires only four small ceramic capacitors making the total solution area less than 22 mm 2 and the height less than 1 mm. The LM2759 is capable of driving loads up to 1A 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. The LED current can be programmed up to 1A via an I 2C-compatible interface, along with eight selectable Flash Time-Out durations. One high-current Flash LED can be driven either in a high-power Flash mode or a low-power Torch mode. The Strobe pin allows the flash to be toggled via a Flash enable signal from a camera module. The TX input pin limits the Flash LED current to the Torch current level during a RF PA pulse, to reduce high loads on the battery. Internal soft-start circuitry limits the amount of inrush current during start-up. LM2759 is offered in a small 12-pin thermally enhanced LLP package. Notice: This document is not a full datasheet. For more information regarding this product or to order samples, please contact your National Semiconductor sales office or visit http://www.national.com/support/dir.html. Applications • Camera Flash in Cellular Phones

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Datasheet

Title		Size	Date	Other Language
	LM2759 PRODUCT BRIEF 1A Switched Capacitor Flash LED Driver with I 2 C Compatible Interface	115 Kbytes	20-Nov-08

Featured Application Notes

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

More Application Notes

Title		Size	Date	Other Language
	AN-1998: Application Note 1998 How to Meet the HDMI 5V Source Requirement	117 Kbytes	28-Aug-09
	AN-1731: Application Note 1731 LM2757 Evaluation Board	573 Kbytes	19-Feb-08

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2759SD	CMOS7	0	18406	0	0	1089000	4	309006723
LM2759SDX	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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