Features 91% Peak LED Drive Efficiency No Inductor Required 0.3% Current Matching Drives 6 LEDs with up to 30mA per LED 180mA of total driver current I2C Compatible Brightness Control Interface Adaptive 1×- 3/2× Charge Pump Resistor-Programmable Current Settings External Chip RESET Pin (RESET#) Extended Li-Ion Input: 2.7V to 5.5V Small low profile industry standard leadless package, LLP 24 : (4mm x 4mm x 0.8mm) Description The LM27966 is a highly integrated charge-pump-based display LED driver. The device can drive up to 6 LEDs in parallel with a total output current of 180mA. Regulated internal current sources deliver excellent current and brightness matching in all LEDs. The LED driver current sources are split into two independently controlled groups. The primary group, which can be configured with 4 or 5 LEDs, can be used to backlight the main phone display. An additional, independently controlled led driver is provided for driving an indicator or other general purpose LED function. The LM27966 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs. The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in Pass-Mode. The proper gain for maintaining current regulation is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage range. The LM27966 is available in National's small 24-pin Leadless Leadframe Package (LLP-24). Applications Mobile Phone Display Lighting PDAs Backlighting General LED Lighting

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM27966 White LED Driver with I2C Compatible Interface	677 Kbytes	3-Aug-06

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM27966SQ/NOPB LM27966SQ RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 FARNELL Europe and Asia 862 MOUSER Worldwide 1000 NEWARK Americas 835	$1.44 each at 1K+ pcs	reel of 1000
LM27966SQX/NOPB LM27966SQX RoHS Status	LLP	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.44 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 LM27966.

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 LM27966 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM27966SQ/NOPB LM27966SQ	39.849 40.002	LLP	24	1 1	260 260	Detail	Download	N/A	NS UZXYTT L27966S
LM27966SQX/NOPB LM27966SQX	39.849 40.002	LLP	24	1 1	260 260	Detail	Download	N/A	NS UZXYTT L27966S

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 LM27966.

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 LM27966 is located at RoHS Status.

CAD Symbols and Models Download LM27966 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM27966SQ	CMOS7	0	21301	0	0	1584000	3	449464325
LM27966SQX	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 LM27966.

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 LM27966 is located at RoHS Status.