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

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Datasheet

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

Featured Application Notes

Title		Size	Date	Other Language
	AN-1582: Application Note 1582 LM27965 Dual Display White LED Driver with I2C Compatible Brightness Control	1226 Kbytes	18-Mar-07	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1321: Application Note 1321 LM2796 Evaluation Board	453 Kbytes	25-May-04
	AN-1362: Application Note 1362 LM27961- Dual-Display White LED Driver with 3/2x Switched Capacitor Boost	625 Kbytes	30-Jun-05	中文
	AN-1582: Application Note 1582 LM27965 Dual Display White LED Driver with I2C Compatible Brightness Control	1226 Kbytes	18-Mar-07	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM27966SQ	CMOS7	0	18406	0	0	1089000	4	309006723
LM27966SQX	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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