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. Applications Camera Flash in Cellular Phones

typ application circuit - simple

Typical Application click for larger image typ application circuit - simple	Block Diagram click for larger image Block Diagram
Typical Performance click for larger image PLED Efficiency

Parameters Values Regulated LEDs 1 Total LED Current 1000 mA Boost Type Switched Capacitor Multi-Gain Switching Frequency 1000 kHz Efficiency (peak) 90 % Input Min Voltage 2.7 Volt Input Max Voltage 5.5 Volt LED Configuration Parallel Current Matching Perfect OutputMax Voltage 5.4 Volt Switching Type Fixed Freq Special Features Flash, Torch, I2C Analog-V BrightCtrl No Ambient Light Compensation No RGB-LED No Temperature Min -30 deg C Temperature Max 85 deg C RegType Switched Cap Regulator PowerWise Yes

Datasheets

Title		Size	Date	Other Language
	LM2759 1A Switched Capacitor Flash LED Driver with I2C Compatible Interface	1308 Kbytes	10-Jun-10

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2759SD/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 1523 FARNELL Europe and Asia 935 MOUSER Worldwide 999 NEWARK Americas 935	$0.70 each at 1K+ pcs	reel of 1000
LM2759SDX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.70 each at 1K+ pcs	reel of 4500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM2759.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM2759 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2759SDEV	LM2759 Eval Board	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$125.00 each	1
Not for Sale. Only for Sales Force

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM2759SD/NOPB	21.112	LLP	12	3	260	Detail	N/A	N/A	ZXYTT L2759
LM2759SDX/NOPB	21.112	LLP	12	3	260	Detail	N/A	N/A	ZXYTT L2759

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM2759.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM2759 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2759SD	CMOS7	0	21301	0	0	1584000	3	449464325
LM2759SDX	CMOS7	0	21301	0	0	1584000	3	449464325

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.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM2759.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM2759 is located at RoHS Status.