Datasheet Linear Technology LTC3863MPDE#PBF

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Design Notes

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  Inverting DC/DC Controller Converts a Positive Input to a Negative Output with a Single Inductor &mdash DN523
  PDF, 322 Kb, File published: Dec 17, 2013
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  Inverting DC/DC Controller Converts a Positive Input to a
  Negative Output with a Single Inductor – Design Note 523
  David Burgoon
  There are several ways to produce a negative voltage
  from a positive voltage source, including using a
  transformer or two inductors and/or multiple switches.
  However, none are as easy as using the LTC В®3863,
  which is elegant in its simplicity, has superior efficiency
  at light loads and reduces parts count compared to
  alternative solutions.
  Advanced Controller Capabilities
  The LTC3863 can produce a –0.4V to –150V negative
  output voltage from a positive input range of 3.5V to
  60V. It uses a single-inductor topology with one active
  P-channel MOSFET switch and one diode. The high
  level of integration yields a simple, low parts-count
  solution.
  The LTC3863 offers excellent light load efficiency,
  drawing only 70ВµA quiescent current in user-programmable Burst Mode В® operation. Its peak current
  mode, constant frequency PWM architecture provides
  positive control of inductor current, easy loop compensation and superior loop dynamics. The switching
  frequency can be programmed from 50kHz to 850kHz
  with an external resistor and can be synchronized to …

Articles

• Download
  Inverting DC/DC Controller Converts a Positive Input to a Negative Output with a Single Inductor &mdash LT Journal
  PDF, 3.0 Mb, File published: Oct 9, 2013
  Extract from the document

  Inverting DC/DC Controller Converts a Positive Input to a
  Negative Output with a Single Inductor
  David Burgoon There are a number of ways to produce a negative voltage from a positive voltage
  source, including using a transformer or two inductors and/or multiple switches, but
  none are as easy as using the LTC3863, which is elegant in its simplicity, has superior
  efficiency at light loads and reduces parts count when compared to these solutions. The LTC3863 can produce a –0.4V to
  –150V negative output voltage from a
  positive input range of 3.5V to 60V. It
  uses a single-inductor topology with one
  active P-channel MOSFET switch and one
  diode. The high level of integration yields
  a simple, low parts count solution.
  The LTC3863 offers excellent light load
  efficiency, drawing only 70Вµ A quiescent
  current in user programmable Burst
  ModeВ® operation. Its peak current mode,
  constant frequency PWM architecture
  provides positive control of inductor
  current, easy loop compensation and
  top-notch loop dynamics. The switching frequency can be programmed from
  50kHz to 850kHz with an external resistor
  and can be synchronized to an external
  clock from 75kHz to 750kHz. The LTC3863 …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > Inverting Regulators
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators

Other Names:

LTC3863MPDEPBF, LTC3863MPDE PBF