IN

HWEN

LM36273

SCL

SDA

C+

C-

VNEG

VPOS

LED1

LED2

BL_OUT

LED3

LCM_OUT

LCM_SW

PWM

LCM_EN1

LCM_EN2

Up to 8 LEDs / String

DSCH

Load (mA)

0

10

20

30

40

50

60

70

80

90

50

55

60

65

70

75

80

85

90

95

D052

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM36273

SNVSA80A – FEBRUARY 2016 – REVISED FEBRUARY 2016

LM36273 Integrated Backlight Driver With Integrated LCD Bias

1

1 Features

1

•

Drives up to Three Parallel White LED Strings

•

11-Bit Exponential and Linear Dimming Control

•

•

Backlight Operation With 4.7-µH to 15-µH Inductor

•

Backlight and LCD Bias Efficiency up to 92%

•

Programmable LCD Bias Voltages (±4 V to ±6.5 V

With 50-mV resolution) With Up to 80-mA per

Output

•

0.2% Matched LED Current From 60 µA to 30 mA

•

1% Accurate LED Current From 60 µA to 30 mA

•

2.7-V to 5-V Input Voltage Range

2 Applications

•

LCD Panels With up to 24 LEDs

•

Smart Phones

•

Tablets and Gaming Tablets

•

Home Automation Panels

space

space

Simplified Schematic

3 Description

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 area.

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

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 optimization.

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.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (MAX)

LM36273

DSBGA (24)

2.44 mm × 1.67 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Backlight Efficiency, 3P7S