Home Energiemanagement LED-Treiber LED-Hintergrundbeleuchtungstreiber

LM36922

AKTIV

Hocheffizienter, synchroner 30-V-LED-Treiber für weiße LEDs mit zwei Strings und 30 V

Produktdetails

Number of channels 2 Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 29.5 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 94 LED current per channel (mA) 25 Peak efficiency (%) 92 Topology Boost Features Adjustable Switch Frequency, CABC, Direct PWM Dimming, Enable/Shutdown, I2C control, OVP, PWM control, 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) 0 Vout (max) (V) 29.5 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 94 LED current per channel (mA) 25 Peak efficiency (%) 92 Topology Boost Features Adjustable Switch Frequency, CABC, Direct PWM Dimming, Enable/Shutdown, I2C control, OVP, PWM control, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YFF) 12 2.52000000000000018 mm² (— mm × — mm)
  • 1% Matched Current Sinks Across (Process,
    Voltage, Temp)
  • 3% Current Sink Accuracy Across (Process,
    Voltage, Temp)
  • 11-Bit Dimming Resolution
  • Up to 91.6% Solution Efficiency
  • Drives from One to Two Parallel LED Strings at up
    to 28 V
  • 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, 21 V, 25 V, 29 V)
  • Four Configurable Overcurrent Protection
    Thresholds (750 mA, 1000 mA, 1250 mA, 1500
    mA)
  • Thermal Shutdown Protection
  • 1% Matched Current Sinks Across (Process,
    Voltage, Temp)
  • 3% Current Sink Accuracy Across (Process,
    Voltage, Temp)
  • 11-Bit Dimming Resolution
  • Up to 91.6% Solution Efficiency
  • Drives from One to Two Parallel LED Strings at up
    to 28 V
  • 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, 21 V, 25 V, 29 V)
  • Four Configurable Overcurrent Protection
    Thresholds (750 mA, 1000 mA, 1250 mA, 1500
    mA)
  • Thermal Shutdown Protection

The LM36922 is an ultra-compact, highly efficient, two string white-LED driver designed for LCD display backlighting. The device can power up to 8 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 and noise-free operation.

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

The LM36922 is an ultra-compact, highly efficient, two string white-LED driver designed for LCD display backlighting. The device can power up to 8 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 and noise-free operation.

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

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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LM36922 Highly Efficient Dual-String White LED Driver datasheet PDF | HTML 13.05.2015
Anwendungshinweis How to use the LM3697 Device to Design a Backlight Unit in a Smartphone PDF | HTML 15.04.2021
Whitepaper Common LED Functions and LED Driver Design Considerations 21.09.2020
Anwendungshinweis Analog PWM Dimming in White-LED Drivers 21.12.2016
Anwendungshinweis Inductor Selection in Boost Converters for LCD Backlight Applications 24.10.2016
Anwendungshinweis Schottky Diode Selection in Asynchronous Boost Converters 06.09.2016

Design und Entwicklung

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Evaluierungsplatine

LM36922EVM — LM36922 Hocheffizienter Zweistrang-Treiber für weiße LEDs – Evaluierungsmodul

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 (...)

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GUI für Evaluierungsmodul (EVM)

SNVC167 — LM36923EVM/LM36922EVM GUI Software

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Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
DSBGA (YFF) 12 Ultra Librarian

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