The LM2794/LM2795 Charge Pump Output Circuit Diagram and Datasheet


The LM2794/LM2795 Charge Pump Output Circuit and Datasheet: connecting additional leds to lm2794 lm2795 charge pump outputjpg

The figure below show you how to connect additional LEDs to the LM2794/2795 voltage output of the pump
(the Pout pin). LM2794/LM2795 is a fractional CMOS charge-pump which
provides four regulated current sources. This device can be applied for white LED display
backlights, white LED keypad backlights, PDAs, hand-held PCs, cellular
phones which uses 1 cell Li-on battery-operated applications.

The LM2794/LM2795 Charge Pump Output Circuit and Datasheet: connecting additional leds to lm2794 lm2795 charge pump outputjpg

Since the LM2794/5 charge pump output
(Pout) pin nominally 1.5xVin, this rail can be used to deliver
additional current to other circuit purposes. It is recommended to use
linear regulator between the Pout pin and the LEDs if you use-for
example a Li-on battery which has unfixed input voltage, while driving LEDs directly off Pout is usually practical when used a fixed input voltage, according to the datasheet.

Another application information section of the LM2794/5 datasheet are Functional Block Circuit Diagram Description (soft start, shutdown mode), Open-Drain Logic Shutdown Control Circuit Diagram, Capacitor-LED selection, Two/One Parallel Connected LED Circuit Diagram, and many more. Follow The LM2794/LM2795 Charge Pump Output Circuit Diagram within the LM2794/5 Datasheet (source: national.com).


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