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.