LM3631 Texas instruments

LM3631

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LM3631

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Описание

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.

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

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
Duty cycle (max) (%)	94
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
Rating	Catalog