Pushbutton On/Off Controller with Failsafe Voltage Monitoring：Have you had the exasperating experience of a laptop or PDA defi antly not responding to your commands? You frantically press key after key, but to no avail. As hope turns to anger (but just before you throw the company’s laptop through the window) you slam your fi nger against the on/off power button. Ten seconds later, your laptop fi nally surrenders and the screen goes black in a high pitched whimper. The unresponsive pushbutton was likely the result of an unresponsive μP or system logic—as evidenced by the crash. By pressing and holding the on/off pushbutton, the LTC2953 provides the user with the ability to force system power off, even under fault conditions. This long pushbutton command works independently of system logic and automatically shuts off power after the adjustable timer expires. The length of time the pushbutton must be held low in order to force a power down is adjustable with an external capacitor on the PDT pin.
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