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LM2794 Datasheet

Part Number LM2794
Manufacturers National Semiconductor
Logo National Semiconductor
Description Current Regulated Switched Capacitor LED Driver
Datasheet LM2794 DatasheetLM2794 Datasheet (PDF)

LM2794/LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control May 2003 LM2794/LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control General 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 curren.

  LM2794   LM2794






Part Number LM2794
Manufacturers Texas Instruments
Logo Texas Instruments
Description Current Regulated Switched Capacitor LED Supply
Datasheet LM2794 DatasheetLM2794 Datasheet (PDF)

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/.

  LM2794   LM2794







Current Regulated Switched Capacitor LED Driver

LM2794/LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control May 2003 LM2794/LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control General 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. 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 micro SMD-14 CSP package. Features n Regulated current sources with ± 0.5% matching between any two outputs n High efficiency 3/2 boost function n Drives one, two, three or four white LEDs n 2.7V to 5.5V Input Voltage n Up to 80mA output current n Analog brightness control n Active-low or high shutdown input (’94/95) n Very small solution size and no inductor n 2.3µA (typ..


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