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LM36273

AKTIV

Dreikanalige LCD-Hintergrundbeleuchtung und Bias-Stromversorgung

Produktdetails

Number of channels 3 Vin (min) (V) 2.7 Vin (max) (V) 5 Vout (min) (V) 27 Vout (max) (V) 30 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 92 LED current per channel (mA) 30 Peak efficiency (%) 92 Topology Boost, Current Sink Features Adjustable Switch Frequency, CABC, Direct PWM Dimming, I2C control, OVP, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 3 Vin (min) (V) 2.7 Vin (max) (V) 5 Vout (min) (V) 27 Vout (max) (V) 30 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 92 LED current per channel (mA) 30 Peak efficiency (%) 92 Topology Boost, Current Sink Features Adjustable Switch Frequency, CABC, Direct PWM Dimming, I2C control, OVP, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YFF) 24 4.67999999999999928 mm² 1.8 x 2.5999999999999996
  • Drives up to Three Parallel White LED Strings
    (29-V Maximum VOUT)
  • 11-Bit Exponential and Linear Dimming Control
  • PWM and I2C Brightness 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
  • Drives up to Three Parallel White LED Strings
    (29-V Maximum VOUT)
  • 11-Bit Exponential and Linear Dimming Control
  • PWM and I2C Brightness 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

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 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 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.

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 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 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.

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Technische Dokumentation

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Typ Titel Datum
* Data sheet LM36273 Three-Channel LCD Backlight Driver With Integrated Bias Power datasheet (Rev. D) PDF | HTML 02 Mär 2018
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Application note How to Use LM3627x to Design DPU in Smartphones 07 Mai 2020
Application note LM3627x Layout Guidelines 12 Okt 2017
Application note Analog PWM Dimming in White-LED Drivers 21 Dez 2016
Application note Inductor Selection in Boost Converters for LCD Backlight Applications 24 Okt 2016
Application note Auto-Frequency Mode Setting for Improved Boost Efficiency in White LED Backlight 14 Okt 2016
Application note Schottky Diode Selection in Asynchronous Boost Converters 06 Sep 2016
EVM User's guide Using the LM36274EVM Evaluation Module 08 Feb 2016

Design und Entwicklung

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GUI für Evaluierungsmodul (EVM)

SNVC194 LM36274EVM GUI 1.0.0

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Hardware-Entwicklung
Evaluierungsplatine
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Simulationstool

PSPICE-FOR-TI — PSpice® für TI Design-und Simulationstool

PSpice® für TI ist eine Design- und Simulationsumgebung, welche Sie dabei unterstützt, die Funktionalität analoger Schaltungen zu evaluieren. Diese voll ausgestattete Design- und Simulationssuite verwendet eine analoge Analyse-Engine von Cadence®. PSpice für TI ist kostenlos erhältlich und (...)
Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
DSBGA (YFF) 24 Ultra Librarian

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