White LED Driver System With I2C Compatible Brightness Control

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 independently 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 Display 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 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 LM27964 is available in National's small 24-pin Leadless Leadframe Package (LLP-24).
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM27964SQX-C/NOPB Texas Instruments White LED Driver System with I2C Compatible Brightness Control 24-WQFN
LM27964SQ-C/NOPB Texas Instruments White LED Driver System with I2C Compatible Brightness Control 24-WQFN -30 to 85
LM27964SQX-A/NOPB Texas Instruments White LED Driver System with I2C Compatible Brightness Control 24-WQFN
LM27964SQ-A/NOPB Texas Instruments White LED Driver System with I2C Compatible Brightness Control 24-WQFN -30 to 85
LM27964SQ-I/NOPB Texas Instruments White LED Driver System with I2C Compatible Brightness Control 24-WQFN -30 to 85
LM27964SQX-I/NOPB Texas Instruments White LED Driver System with I2C Compatible Brightness Control 24-WQFN -30 to 85
LM27964 's PackagesLM27964 's pdf datasheet
LM27964SQ-C LLP
LM27964SQX-C LLP
LM27964SQ-I LLP
LM27964SQX-I LLP




LM27964 Pinout, Pinouts
LM27964 pinout,Pin out
This is one package pinout of LM27964,If you need more pinouts please download LM27964's pdf datasheet.

LM27964 Application circuits
LM27964 circuits
This is one application circuit of LM27964,If you need more circuits,please download LM27964's pdf datasheet.


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