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LM27964SQ-A Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM27964SQ-A Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 13 page  LM27964 White LED Driver System with I2C Compatible Brightness Control General Description The LM27964 is a charge-pump-based white-LED driver that is ideal for mobile phone display backlighting. The LM27964 can drive up to 6 LEDs in parallel along with multiple keypad LEDs, with a total output current up to 180mA. Regulated internal current sources deliver excellent current matching in all LEDs. The LED driver current sources are split into two indepen- dently controlled groups. The primary group (4 LEDs) can be used to backlight the main phone display and the second group (2 LEDs) can be used to backlight a secondary dis- play. A single Keypad LED driver can power up to 16 keypad LEDs with a current of 5mA each. The LM27964 has an I 2C compatible interface that allows the user to independently control the brightness on each bank of LEDs. The LM27964 works off an extended Li-Ion input voltage range (2.7V to 5.5V). The device provides excellent effi- ciency 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 LM27964 is available in National’s small 24-pin Lead- less Leadframe Package (LLP-24). Features n 87% Peak LED Drive Efficiency n 0.2% Current Matching between Current Sinks n Drives 6 LEDs with up to 30mA per LED in two distinct groups, for backlighting two displays (main LCD and sub LCD) n Dedicated Keypad LED Driver with up to 80mA of drive current n Independent Resistor-Programmable Current Settings n I 2C Compatible Brightness Control Interface n Adaptive 1x- 3/2x Charge Pump 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) n LM27964SQ-I LED PWM frequency = 10kHz, LM27964SQ-A LED PWM frequency = 23kHz Applications n Mobile Phone Display Lighting n Mobile Phone Keypad Lighting n PDAs Backlighting n General LED Lighting Typical Application Circuit 20138101 October 2005 © 2005 National Semiconductor Corporation DS201381 www.national.com |
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