Datasheet Linear Technology LTC2953CDD-1#PBF

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LTC2953-2

Design Notes

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  Pushbutton On/Off Controller with Failsafe Voltage Monitoring &mdash DN427
  PDF, 90 Kb, File published: Oct 5, 2007
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  Pushbutton On/Off Controller with Failsafe Voltage Monitoring
  Design Note 427
  Victor Fleury
  Introduction
  Have you had the exasperating experience of a laptop or
  PDA defiantly 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 п¬Ѓnger against
  the on/off power button. Ten seconds later, your laptop
  п¬Ѓnally surrenders and the screen goes black in a high
  pitched whimper. enables a DC/DC converter or turns on a power switch.
  These circuits communicate with system logic to make
  sure that power turns on and turns off in an orderly
  manner. Additionally, failsafe features should disable
  system power if there is a problem with either the input or
  output power supply. The pushbutton monitor must also
  be rugged: absorb high levels of electrostatic discharge,
  tolerate voltage transients below ground and operate at
  high voltage levels. 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 …

Articles

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  Pushbutton On/Off Controller Provides uProcessor Reset Monitor and Input Supply Monitoring &mdash LT Journal
  PDF, 297 Kb, File published: Oct 16, 2007
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  DESIGN FEATURES L Pushbutton On/Off Controller Provides
  ВµProcessor Reset Monitor and Input
  by Victor Fleury
  Supply Monitoring
  Introduction
  System designers often grapple with
  ways to debounce and control the
  on/off pushbutton of portable devices.
  Traditional debounce designs use
  discrete logic, flip-flops, resistors and
  capacitors. Some designs require an
  onboard microprocessor to monitor the
  pushbutton, but this puts a burden on
  the microprocessor—if it hangs up, all
  device on/off control is lost. Also, in
  high voltage, multicell battery applications the low voltage circuits require
  an LDO power supply. In the end,
  what should be a simple monitoring
  circuit consumes an oversized share
  of the space and complexity of the
  system. Plus, its draw on the power
  budget is high even when the system
  is off, since the microprocessor must …

Model Line

Manufacturer's Classification

• Monitor, Control and Protection > Pushbutton Controllers
• Monitor, Control and Protection > Supervisory Circuits > Single Supply Monitors

Other Names:

LTC2953CDD-1PBF, LTC2953CDD-1 PBF, LTC2953CDD1#PBF, LTC2953CDD 1#PBF