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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