Features • 91% Peak LED Drive Efficiency • No Inductor Required • 0.3% Current Matching • Drives LEDs with up to 30mA per LED • 180mA of total drive current • I 2C Compatible Brightness Control Interface • Adaptive 1× - 3/2× Charge Pump • Resistor-Programmable Current Settings • External Chip ^RESET Pin • Extended Li-Ion Input: 2.7V to 5.5V • Small low profile industry standard leadless package, LLP 24 : (4mm x 4mm x 0.8mm) • 25mm 2 total solution size • Two I 2C Compatible Chip Address Options: 0x36 for LM27965SQ and 0x38 for LM27965SQ-M Description The LM27965 is a highly integrated charge-pump-based dual-display LED driver. The device can drive up to 9 LEDs in parallel with a total output current of 180mA. Regulated internal current sinks deliver excellent current and brightness matching in all LEDs. The LED driver current sinks are split into three independently controlled groups. The primary group can beconfigurabled with 4 or 5 LEDs, for backlighting a larger main display and the second group can be configured with 2 or 3 LEDs, for backlighing a smaller secondary display. An additional, independently controlled led driver is provided for driving an indicator or general purpose LED. The LM27965 has an I 2C 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 LM27965 is available in National's small 24-pin Leadless Leadframe Package (LLP-24). Applications • Mobile Phone Display Lighting • PDA Backlighting • General LED Lighting

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Datasheet

Title		Size	Date	Other Language
	LM27965 Dual Display White LED Driver with I2C Compatible Brightness Control	356 Kbytes	23-Oct-07	日本語

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

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM27965SQ	CMOS7	0	18406	0	0	1089000	4	309006723
LM27965SQ-M	CMOS7	0	18406	0	0	1089000	4	309006723
LM27965SQX	CMOS7	0	18406	0	0	1089000	4	309006723
LM27965SQX-M	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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