The LM36273 is an
integrated three-channel WLED
driver and LCD bias supply. The ultra-compact size, high efficiency, high level of integration, and
programmability allow the LM36273 to address a
variety of applications without the need for hardware changes while minimizing the overall solution
The backlight boost provides the power to bias three parallel LED strings with up to 29-V total output voltage.
The 11-bit LED current is programmable via the I2C bus and/or controlled
via a logic level PWM input from 60 µA to 30 mA. Each LED string can be independently enabled or
disabled to provide zone dimming capabilities. The backlight boost can be operated efficiently with
an inductance range from 4.7 µH to 15 µH, allowing for efficiency and solution size
The LCD bias boost provides the power to both a positive LDO and an inverting charge
pump. Both positive and negative bias supplies have programmable output voltages of ±4 V to ±6.5 V
with 50-mV steps and up to ±80 mA of current capability. An auto-sequencing feature provides a
programmed delay from positive to negative bias activation, with additional programmable voltage
slew rate control. Two wake-up modes allow both bias outputs to be controlled with a single
external signal and stay active while consuming very low quiescent current.
To request a full data sheet or other design resources:
For all available packages, see the orderable addendum at the
end of the data sheet.
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