| Number of channels (#) | 2 |
| Vin (Min) (V) | 2.7 |
| Vin (Max) (V) | 5 |
| Vout (Min) (V) | 0 |
| Vout (Max) (V) | 30 |
| Type | Inductive |
| Switching frequency (Max) (kHz) | 1100 |
| LED current per channel (mA) | 25 |
| Peak efficiency (%) | 90 |
| Topology | Boost, Current Sink, LDO, Multi-Channel |
| Features | Adjustable Switch Frequency, CABC, Enable/Shutdown, I2C Control, OVP, PWM Control, Power Good, Soft Start |
| Operating temperature range (C) | -40 to 85 |
- 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
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.
