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LM2794 - Current Regulated Switched Capacitor LED Supply

Description

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.

Features

  • 1.
  • 2 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 Freq.

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Full PDF Text Transcription

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LM2794, LM2795 www.ti.com SNVS168L – JANUARY 2002 – REVISED MAY 2013 LM2794 /LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control Check for Samples: LM2794, LM2795 FEATURES 1 •2 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.
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