Datasheet Linear Technology LTC4412HV — Datenblatt

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  Extending the Input Voltage Range of PowerPath Circuits for Automotive and Industrial Applications &mdash AN107
  PDF, 77 Kb, Datei veröffentlicht: Jul 30, 2006
  The voltage range of Linear Technology's PowerPath circuits can be easily extended with just a few components, thus allowing them to meet the needs of virtually all applications. This application note presents solutions for circuits that must withstand large negative voltages, a reverse adapter input for example, and circuits that must withstand large positive inputs, such as automotive load-dump.
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  Application Note 107
  July 2006
  Extending the Input Voltage Range of PowerPath
  Circuits for Automotive and Industrial Applications
  Greg Manlove
  INTRODUCTION POWER
  SUPPLY The voltage range of Linear Technology’s PowerPath® circuits can be easily extended with just a few components, thus
  allowing them to meet the needs of virtually all applications.
  This application note presents solutions for circuits that
  must withstand large negative voltages, a reverse adapter
  input for example, and circuits that must withstand large
  positive inputs, such as automotive load-dump.
  EXTENDING THE VOLTAGE RANGE
  Any of Linear’s PowerPath controller circuits can benefit
  from an extended voltage range, even those that already
  have wide operating and absolute maximum voltage
  ranges. For instance, the LTC4412HV and LTC4414 will
  each withstand voltages from –14V to 40V, which can be
  extended further using the techniques described here.
  Likewise, the LTC4412’s range of –14V to 28V can be
  extended. The voltage ranges of monolithic PowerPath
  solutions such as the LTC4411, which ranges from –0.3V
  to 6V, can also be extended, though not as far. …

Konstruktionshinweise

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  Ideal Diode Controller Eliminates Energy Wasting Diodes in Power OR-ing Applications &mdash DN386
  PDF, 73 Kb, Datei veröffentlicht: Feb 7, 2006
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  Ideal Diode Controller Eliminates Energy Wasting Diodes in
  Power OR-ing Applications – Design Note 386
  David Laude
  Introduction
  Many modern electronic devices need a means to automatically switch between power sources when prompted
  by the insertion or removal of any source. The LTCВ®4412
  simplifies PowerPathTM management and control by
  providing a low loss, near ideal diode controller function. Any circuit that could otherwise use a diode OR
  to switch between power sources can benefit from the
  LTC4412. The forward voltage drop of an LTC4412 ideal
  diode is far less than that of a conventional diode, and
  the reverse current leakage can be smaller for the ideal
  diode as well (see Figure 1). The tiny forward voltage
  drop reduces power losses and self-heating, resulting
  in extended battery life. Features include: Wide supply operating range of 2.5V to 28V (36V
  absolute maximum) Voltage drop across the controlled external MOSFET
  of only 20mV (typical) Applications include anything that takes power from
  two or more inputs: Low component count helps keep overall system
  cost low Cellular phones 6-pin ThinSOTTM package permits a compact design
  solution PDAs 1 Protection of MOSFET from excessive gate-to-source
  voltage with VGS limiter Low quiescent current of 11ВµA with a 3.6V supply,
  independent of the load current A status pin that can be used to enable an auxiliary MOSFET power switch or to indicate to a
  microcontroller that an auxiliary supply, such as a …

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• Monitor, Control and Protection > PowerPath Controllers & Ideal Diodes