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背光 LED 驅動器

LM36923

現行

高效、三串列、30-V 同步白色 LED 驅動器

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產品規格表

LM36923

現行
產品規格表 立即訂購

產品詳細資料

Number of channels 3 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 3 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 Three 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 Three 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 LM36923 is an ultra-compact, highly efficient, threestring 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.

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

The LM36923 is an ultra-compact, highly efficient, threestring 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.

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

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LM36922 現行 高效、雙串列、30-V 同步白色 LED 驅動器 This product is a 3 string backlight driver with 11-bits of exponential dimming.

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 LM36923 Highly Efficient Triple-String White LED Driver datasheet (Rev. A) PDF | HTML 2016/10/7
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 Auto-Frequency Mode Setting for Improved Boost Efficiency in White LED Backlight 2016/10/14
應用說明 Schottky Diode Selection in Asynchronous Boost Converters 2016/9/6

設計與開發

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開發板

LM36923EVM — LM36923EVM 高效率三燈串白色 LED 驅動器 EVM

LM36923 評估模組 (LM36923EVM) 專為全面評估 LM36923 高效率三串聯白光 LED 背光驅動器而設計。  LM36923EVM 包含具備 3p8s 白光 LED 燈串的 LM36923，並配備跳線以啟用 1p2s 到 3p8s 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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