Pushbutton on/off control for battery-powered device, with automatic turn-on when the device is plugged in
This circuit shows a typical LTC2955-1 application for a handheld device. The 3.6V supply is produced directly from the handheld’s battery; the 12V secondary supply comes from a wall adapter. Both the 3.6V and 12V inputs are connected to the LT3060 regulator input via diode-OR so that either supply can power the system. The LTC4412 is an ideal diode controller that controls the P-channel MOSFET to reduce the voltage drop across the diode connected to the 3.6V supply.
Software
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu
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