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LM2794

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具有模拟和 PWM 亮度控制功能的电流调节开关电容器 LED 电源

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LM2794

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产品详情

Number of channels 4 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) 675 Duty cycle (max) (%) 100 LED current per channel (mA) 20 Peak efficiency (%) 80 Topology Boost Features Analog/PWM mixed dimming Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 4 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) 675 Duty cycle (max) (%) 100 LED current per channel (mA) 20 Peak efficiency (%) 80 Topology Boost Features Analog/PWM mixed dimming Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YPA) 14 5.5845 mm² 2.482 x 2.25
  • Regulated Current Sources with ±0.5% Matching between any Two Outputs
  • High Efficiency 3/2 Boost Function
  • Drives One, Two, Three or four White LEDs
  • 2.7V to 5.5V Input Voltage
  • Up to 80mA Output Current
  • Analog Brightness Control
  • Active-Low or High Shutdown Input ('94/95)
  • Very Small Solution Size and no Inductor
  • 2.3µA (typ.) Shutdown Current
  • 325kHz Switching Frequency (min.)
  • Constant Frequency Generates Predictable Noise Spectrum
  • Thin DSBGA Package: 2.08mm X 2.403mm X 0.600mm High

All trademarks are the property of their respective owners.

  • Regulated Current Sources with ±0.5% Matching between any Two Outputs
  • High Efficiency 3/2 Boost Function
  • Drives One, Two, Three or four White LEDs
  • 2.7V to 5.5V Input Voltage
  • Up to 80mA Output Current
  • Analog Brightness Control
  • Active-Low or High Shutdown Input ('94/95)
  • Very Small Solution Size and no Inductor
  • 2.3µA (typ.) Shutdown Current
  • 325kHz Switching Frequency (min.)
  • Constant Frequency Generates Predictable Noise Spectrum
  • Thin DSBGA Package: 2.08mm X 2.403mm X 0.600mm High

All trademarks are the property of their respective owners.

The LM2794/95 is a fractional CMOS charge-pump that provides four regulated current sources. It accepts an input voltage range from 2.7V to 5.5V and maintains a constant current determined by an external sense resistor.

The LM2794/5 delivers up to 80mA of load current to accommodate four White LEDs. The switching frequency is 325kHz. (min.) to keep the conducted noise spectrum away from sensitive frequencies within portable RF devices.

Brightness can be controlled by both linear and PWM techniques. A voltage between 0V and 3.0V may be applied to the BRGT pin to linearly vary the LED current. Alternatively, a PWM signal can be applied to the SD pin to vary the perceived brightness of the LED. The SD pin reduces the operating current to 2.3µA (typ.) The LM2794 is shut down when the SD pin is low, and the LM2795 is shut down when the SD pin is high.

The LM2794/95 is available in a DSBGA CSP package.

The LM2794/95 is a fractional CMOS charge-pump that provides four regulated current sources. It accepts an input voltage range from 2.7V to 5.5V and maintains a constant current determined by an external sense resistor.

The LM2794/5 delivers up to 80mA of load current to accommodate four White LEDs. The switching frequency is 325kHz. (min.) to keep the conducted noise spectrum away from sensitive frequencies within portable RF devices.

Brightness can be controlled by both linear and PWM techniques. A voltage between 0V and 3.0V may be applied to the BRGT pin to linearly vary the LED current. Alternatively, a PWM signal can be applied to the SD pin to vary the perceived brightness of the LED. The SD pin reduces the operating current to 2.3µA (typ.) The LM2794 is shut down when the SD pin is low, and the LM2795 is shut down when the SD pin is high.

The LM2794/95 is available in a DSBGA CSP package.
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类型 标题 下载最新的英语版本 日期
* 数据表 LM2794,LM2795 Current Reg Switched Cap LED Sup w/Analog & PWM Brightness Control 数据表 (Rev. L) 2013年 5月 2日
白皮书 常见 LED 功能和 LED 驱动器设计注意事项 英语版 2020年 9月 21日
EVM 用户指南 AN-1218 LM2791/2/4/5 Evaluation Board (Rev. B) 2013年 4月 30日
应用手册 Switched Cap Circuits Provide Efficient and Functional White LED Drive (Rev. B) 2013年 4月 30日

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