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LM27965

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具有 I2C 兼容亮度控制功能的双通道显示白光 LED 驱动器

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LM27965

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产品详情

Number of channels 8 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 5.5 Type Capacitive Switching frequency (max) (kHz) 1570 Duty cycle (max) (%) 100 LED current per channel (mA) 30 Peak efficiency (%) 91 Topology Buck Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 8 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 5.5 Type Capacitive Switching frequency (max) (kHz) 1570 Duty cycle (max) (%) 100 LED current per channel (mA) 30 Peak efficiency (%) 91 Topology Buck Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
WQFN (RTW) 24 16 mm² (4 mm × 4 mm)
  • 91% Peak LED Drive Efficiency
  • No Inductor Required
  • 0.3% Current Matching
  • Drives LEDs with up to 30mA per LED
  • 180mA of total drive current
  • I2C Compatible Brightness Control Interface
  • Adaptive 1× - 3/2× Charge Pump
  • Resistor-Programmable Current Settings
  • External Chip RESET Pin
  • Extended Li-Ion Input: 2.7V to 5.5V
  • Small low profile industry standard leadless package, WQFN 24 : (4mm x 4mm x 0.8mm)
  • 25mm2 total solution size
  • Two I2C Compatible Chip Address Options: 0x36 for LM27965SQ and 0x38 for
    LM27965SQ-M
  • 91% Peak LED Drive Efficiency
  • No Inductor Required
  • 0.3% Current Matching
  • Drives LEDs with up to 30mA per LED
  • 180mA of total drive current
  • I2C Compatible Brightness Control Interface
  • Adaptive 1× - 3/2× Charge Pump
  • Resistor-Programmable Current Settings
  • External Chip RESET Pin
  • Extended Li-Ion Input: 2.7V to 5.5V
  • Small low profile industry standard leadless package, WQFN 24 : (4mm x 4mm x 0.8mm)
  • 25mm2 total solution size
  • Two I2C Compatible Chip Address Options: 0x36 for LM27965SQ and 0x38 for
    LM27965SQ-M

The LM27965 is a highly integrated charge-pump-based dual-display LED driver. The device can drive up to 9 LEDs in parallel with a total output current of 180mA. Regulated internal current sinks deliver excellent current and brightness matching in all LEDs.

The LED driver current sinks are split into three independently controlled groups. The primary group can beconfigurabled with 4 or 5 LEDs, for backlighting a larger main display and the second group can be configured with 2 or 3 LEDs, for backlighing a smaller secondary display. An additional, independently controlled led driver is provided for driving an indicator or general purpose LED. The LM27965 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs.

The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in Pass-Mode. The proper gain for maintaining current regulation is chosen based on LED forward voltage, so that efficiency is maximized over the input voltage range.

The LM27965 is available in a small 24-pin WQFN-24 package.

The LM27965 is a highly integrated charge-pump-based dual-display LED driver. The device can drive up to 9 LEDs in parallel with a total output current of 180mA. Regulated internal current sinks deliver excellent current and brightness matching in all LEDs.

The LED driver current sinks are split into three independently controlled groups. The primary group can beconfigurabled with 4 or 5 LEDs, for backlighting a larger main display and the second group can be configured with 2 or 3 LEDs, for backlighing a smaller secondary display. An additional, independently controlled led driver is provided for driving an indicator or general purpose LED. The LM27965 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs.

The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in Pass-Mode. The proper gain for maintaining current regulation is chosen based on LED forward voltage, so that efficiency is maximized over the input voltage range.

The LM27965 is available in a small 24-pin WQFN-24 package.
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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 LM27965 Dual Display White LED Driver with I2C Compatible Brightness Control 数据表 (Rev. B) 2013-2-20
白皮书 常见 LED 功能和 LED 驱动器设计注意事项 英语版 2020-9-21
应用手册 LM27965 Dual Display White LED Driver w/I2C Compatible Brightness Control (Rev. B) 2013-4-30
应用手册 Optimizing Efficiency in White LED Backlight Applications 2007-3-21

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封装 引脚 CAD 符号、封装和 3D 模型
WQFN (RTW) 24 Ultra Librarian
适用于评估类项目的 TI 标准条款与条件。

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