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Controladores para LED de retroiluminación

LM2794

ACTIVO

Alimentación LED de capacitor conmutado regulado por corriente con control de brillo analógico y PWM

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LM2794

ACTIVO
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Detalles del producto

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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Documentación técnica

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Tipo Título Fecha
* Data sheet LM2794,LM2795 Current Reg Switched Cap LED Sup w/Analog & PWM Brightness Control datasheet (Rev. L) 02 may 2013
White paper Common LED Functions and LED Driver Design Considerations 21 sep 2020
EVM User's guide AN-1218 LM2791/2/4/5 Evaluation Board (Rev. B) 30 abr 2013
Application note Switched Cap Circuits Provide Efficient and Functional White LED Drive (Rev. B) 30 abr 2013

Diseño y desarrollo

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