1 Features

1• 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

2 Applications

Mobile Device LCD Backlighting and Bias

3 Description

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.