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LM27966SQ 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM27966SQ 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
1 / 13 page LM27966 White LED Driver with I2C Compatible Interface General 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 bright- ness matching in all LEDs. The LED driver current sources are split into two indepen- dently 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 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 regu- lation 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 Lead- less Leadframe Package (LLP-24). Features n 91% Peak LED Drive Efficiency n No Inductor Required n 0.3% Current Matching n Drives 6 LEDs with up to 30mA per LED n 180mA of total driver current n I 2C Compatible Brightness Control Interface n Adaptive 1x- 3/2x Charge Pump n Resistor-Programmable Current Settings n External Chip RESET Pin (RESET) n Extended Li-Ion Input: 2.7V to 5.5V n Small low profile industry standard leadless package, LLP 24 : (4mm x 4mm x 0.8mm) Applications n Mobile Phone Display Lighting n PDAs Backlighting n General LED Lighting Typical Application Circuit 20190101 August 2006 © 2006 National Semiconductor Corporation DS201901 www.national.com |
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