NATIONAL SEMICONDUCTOR LM27966 White LED Driver with I C Compatible Brightness Control handbook
Update: 30 September, 2023
LM27966 is a highly integrated charge-pump-based display LED driver from National. 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 Lead- less Leadframe Package (LLP-24).
Brand: National
File format: PDF
Size: 678 KB
MD5 Checksum: FB727669CA806B2D3FD6A763858AC2FB
Publication date: 02 May, 2012
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PDF Link: NATIONAL SEMICONDUCTOR LM27966 White LED Driver with I C Compatible Brightness Control handbook PDF