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RT4831A - Four-Channel LCD Backlight Driver

Description

The RT4831A is an integrated four-channel backlight WLED driver with LCD bias supply for portable device.

The backlight WLED driver supports up to 4P8S WLED configuration.

Meanwhile, the driver maximum acceptable output voltage is 29V.

Features

  • System.
  • Hardware Enable Pin.
  • I2C Controlled Interface.
  • Over-Temperature Protection Backlight WLED Driver.
  • 2.7V to 5V Input Voltage Range.
  • Drives Up to 4P8S WLED Configuration (29V Maximum Output Voltage).
  • External PWM Input and I2C Brightness Control.
  • 11 Bit Exponential and Linear Dimming Control.
  • Programmable Over-Voltage Protection.
  • Programmable Over-Current Protection.
  • Auto Operating Frequency (250kHz, 500kHz, 1MHz).
  • WLED Current Ramp Up.

📥 Download Datasheet

Datasheet preview – RT4831A

Datasheet Details

Part number RT4831A
Manufacturer Richtek
File Size 4.11 MB
Description Four-Channel LCD Backlight Driver
Datasheet download datasheet RT4831A Datasheet
Additional preview pages of the RT4831A datasheet.

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Full PDF Text Transcription

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RT4831A Four-Channel LCD Backlight Driver with Integrated Bias Power General Description The RT4831A is an integrated four-channel backlight WLED driver with LCD bias supply for portable device. The backlight WLED driver supports up to 4P8S WLED configuration. Meanwhile, the driver maximum acceptable output voltage is 29V. Each channel current is controlled by the I2C interface and/or the external PWM input to achieve 11 bit LED current steps from 60A to 30mA in exponential or linear mapping curves. The LCD bias supply is implemented with a Boost, a LDO and an inverting charge pump to provide positive and negative voltage. The LCD bias provides up to 150mA output current and the output voltage can be programmed via I2C interface from ±4V to ±6.5V with 50mV/step.
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