LM27966 (ACTIVE)

White LED Driver with I2C Compatible Interface

 

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 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 a small 24-pin Leadless Leadframe WQFN-24 package.

Features

  • 91% Peak LED Drive Efficiency
  • No Inductor Required
  • 0.3% Current Matching
  • Drives 6 LEDs with up to 30mA per LED
  • 180mA of total driver current
  • I2C Compatible Brightness Control Interface
  • Adaptive 1×- 3/2× Charge Pump
  • Resistor-Programmable Current Settings
  • External Chip RESET Pin (RESET)
  • Extended Li-Ion Input: 2.7V to 5.5V
  • Small low profile industry standard leadless package, WQFN 24 : (4mm x 4mm x 0.8mm)

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Parametrics Compare all products in Backlight LED Driver

 
Channels (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switching Frequency (Max) (kHz)
Type
LED Current Per Channel (mA)
LED (#)
Topology
Shutdown Current (Typ) (uA)
Peak Efficiency (%)
LED Configuration
Features
Rating
Operating Temperature Range (C)
Pin/Package
LM27966
6   
2.7   
5.5   
2.7   
5.5   
1570   
Capacitive   
30   
6   
Boost   
3.4   
91   
Parallel   
I2C Control   
Catalog   
-30 to 85   
24WQFN