• Drives up to Two Strings with Maximum of Eight LEDs in Series
  • Integrated Backlight Boost with 29-V Maximum Output Voltage
  • Two Low-Side Constant-Current LED Drivers with 25-mA Maximum Output Current
• Backlight Efficiency Up to 90%
• 11-Bit Linear or Exponential Dimming with up to 17-Bit Output Resolution
• External PWM Input for CABC Backlight Operation
• LCD Bias Efficiency > 85%
• Programmable Positive LCD bias, 4-V to 6-V, 100-mA Maximum Output Current
• Programmable Negative LCD bias, –4-V to –6-V, 80-mA Maximum Output Current
• Two Positive Programmable LDO Reference Outputs
  • 4-V to 6-V, 50-mA Maximum Output Current
  • 1.8-V to 3.3-V, 80-mA Maximum Output Current
• 2.7-V to 5-V Input Voltage Range

Mobile Device LCD Backlighting and Bias

The LM3631 is a complete LCD backlight and bias power solution for mobile devices. This one-chip solution has an integrated high-efficiency backlight LED driver and positive/negative bias supplies for LCD drivers addressing the power requirements of high-definition LCDs. Integrated solution allows small solution size while still maintaining high performance.

Capable of driving up to 16 LEDs, the LM3631 is ideal for small- to medium-size displays. Two additional programmable LDO regulator outputs can be used to power display controller, LCD gamma reference, or any additional peripherals.

A high level of integration and programmability allows the LM3631 to address a variety of applications without the need for hardware changes. Voltage levels, backlight configuration, and power sequences are all configurable through I2C interface.