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Controladores para LED de retroiluminación

LM36922H

ACTIVO

Controlador LED blanco de dos cadenas de alta eficiencia

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LM36922H

ACTIVO
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Detalles del producto

Number of channels 2 Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (min) (V) 37 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 92 LED current per channel (mA) 30 Peak efficiency (%) 92 Topology Boost, Current Sink, Multi-Channel 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 2 Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (min) (V) 37 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 92 LED current per channel (mA) 30 Peak efficiency (%) 92 Topology Boost, Current Sink, Multi-Channel Features Adjustable Switch Frequency, CABC, Direct PWM Dimming, I2C control, OVP, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YFF) 12 2.52000000000000018 mm² 1.4000000000000001 x 1.8
  • 1% Matched Current Sinks Across Process, Voltage, Temperature
  • 3% Current-Sink Accuracy Across Process, Voltage, Temperature
  • 11-Bit Dimming Resolution
  • Up to 90% Solution Efficiency
  • Drives from One to Two Parallel LED Strings at up to 38 V at 25 mA per String
  • PWM Dimming Input
  • I2C Programmable
  • Selectable 500-kHz and 1-MHz Switching Frequency With Optional –12% shift
  • Auto Switch Frequency Mode (250 kHz, 500 kHz, 1 MHz)
  • Four Configurable Overvoltage Protection Thresholds (17 V, 24 V, 31 V, 38 V)
  • Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA,
    1500 mA)
  • Thermal Shutdown Protection
  • Externally Selectable I2C Address Options via ASEL Input
  • 1% Matched Current Sinks Across Process, Voltage, Temperature
  • 3% Current-Sink Accuracy Across Process, Voltage, Temperature
  • 11-Bit Dimming Resolution
  • Up to 90% Solution Efficiency
  • Drives from One to Two Parallel LED Strings at up to 38 V at 25 mA per String
  • PWM Dimming Input
  • I2C Programmable
  • Selectable 500-kHz and 1-MHz Switching Frequency With Optional –12% shift
  • Auto Switch Frequency Mode (250 kHz, 500 kHz, 1 MHz)
  • Four Configurable Overvoltage Protection Thresholds (17 V, 24 V, 31 V, 38 V)
  • Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA,
    1500 mA)
  • Thermal Shutdown Protection
  • Externally Selectable I2C Address Options via ASEL Input

The LM36922H is an ultra-compact, highly efficient, two-string white-LED driver designed for LCD display backlighting. The device can power up to 12 series LEDs at up to 25 mA per string. An adaptive current regulation method allows for different LED voltages in each string while maintaining current regulation.

The LED current is adjusted via an I2C interface or through a logic level PWM input. The PWM duty cycle is internally sensed and mapped to an 11-bit current thus allowing for a wide range of PWM frequencies with noise-free operation from 50 µA to 25 mA.

Other features include an auto-frequency mode, which can automatically change the frequency based on load current in order to optimize efficiency.

The device operates over the 2.5-V to 5.5-V input voltage range and a –40°C to +85°C temperature range.

For all available packages, see the orderable addendum at the end of the data sheet.

The LM36922H is an ultra-compact, highly efficient, two-string white-LED driver designed for LCD display backlighting. The device can power up to 12 series LEDs at up to 25 mA per string. An adaptive current regulation method allows for different LED voltages in each string while maintaining current regulation.

The LED current is adjusted via an I2C interface or through a logic level PWM input. The PWM duty cycle is internally sensed and mapped to an 11-bit current thus allowing for a wide range of PWM frequencies with noise-free operation from 50 µA to 25 mA.

Other features include an auto-frequency mode, which can automatically change the frequency based on load current in order to optimize efficiency.

The device operates over the 2.5-V to 5.5-V input voltage range and a –40°C to +85°C temperature range.

For all available packages, see the orderable addendum at the end of the data sheet.

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Documentación técnica

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* Data sheet LM36922H Highly Efficient Dual-String White LED Driver datasheet (Rev. A) PDF | HTML 16 feb 2016
White paper Common LED Functions and LED Driver Design Considerations 21 sep 2020
Application note Analog PWM Dimming in White-LED Drivers 21 dic 2016

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

LM36922EVM — Módulo de evaluación de controlador LED blanco de dos cadenas de alta eficiencia LM36922

The LM36922 Evaluation Module (LM36922EVM) is designed to fully evaluate the LM36922 Highly Efficient Dual-String White LED backlight driver.  The LM36922EVM consists of the LM36922 with 2p8s white LED strings with jumpers to enable 1p2s through 2p8s led string configurations.  LED string (...)

Guía del usuario: PDF
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GUI para el módulo de evaluación (EVM)

SNVC193 — LM36923HEVM/LM36922HEVM GUI Software

Productos y hardware compatibles

Productos y hardware compatibles

Productos
Controladores para LED de retroiluminación
LM36922H — Controlador LED blanco de dos cadenas de alta eficiencia LM36923H — Controlador LED blanco de tres cadenas de alta eficiencia
Desarrollo de hardware
Placa de evaluación
LM36923HEVM — Módulo de evaluación de controlador LED blanco de tres cadenas de alta eficiencia LM36923H
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Herramienta de simulación

PSPICE-FOR-TI — PSpice® para herramienta de diseño y simulación de TI

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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DSBGA (YFF) 12 Ultra Librarian
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Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

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