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背光 LED 驅動器

LM36922

現行

高效、雙串列、30-V 同步白色 LED 驅動器

立即訂購
產品規格表

LM36922

現行
產品規格表 立即訂購

產品詳細資料

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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技術文件

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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LM36922 Highly Efficient Dual-String White LED Driver datasheet PDF | HTML 2015/5/13
應用說明 How to use the LM3697 Device to Design a Backlight Unit in a Smartphone PDF | HTML 2021/4/15
白皮書 Common LED Functions and LED Driver Design Considerations 2020/9/21
應用說明 Analog PWM Dimming in White-LED Drivers 2016/12/21
應用說明 Inductor Selection in Boost Converters for LCD Backlight Applications 2016/10/24
應用說明 Schottky Diode Selection in Asynchronous Boost Converters 2016/9/6

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LM36922EVM — LM36922 高效率雙燈串白色 LED 驅動器評估模組

LM36922 評估模組 (LM36922EVM) 專為全面評估 LM36922 高效率雙串聯白光 LED 背光驅動器而設計。  LM36922EVM 評估模組包含一顆 LM36922 晶片，搭載 2p8s 白光 LED 燈串，並設有跳線，可實現從 1p2s 到 2p8s 的 LED 燈串配置。  可透過量測每個 LED 燈串中 10 歐姆電阻的電壓降來驗證 LED 燈串電流。  評估套件隨附 USB2ANY 介面和 GUI，適用於開箱即用式評估。

使用指南: PDF
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開發模組 (EVM) 的 GUI

SNVC167 — LM36923EVM/LM36922EVM GUI Software

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DSBGA (YFF) 12 Ultra Librarian
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