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Design Notes

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  Active Voltage Positioning Reduces Output Capacitors &mdash Design Solutions 10
  PDF, 130 Kb, File published: Nov 1, 1999
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  Design Solutions 10
  November 1999
  Active Voltage Positioning Reduces Output Capacitors
  by Robert Sheehan
  INTRODUCTION
  Power supply performance, especially transient response,
  is key to meeting today’s demands for low voltage, high
  current microprocessor power. In an effort to minimize
  the voltage deviation during a load step, a technique that
  has recently been coined “active voltage positioning” is
  generating substantial interest and gaining popularity in
  the portable computer market. The benefits include lower
  peak-to-peak output voltage deviation for a given load
  step, without having to increase the output filter capacitance. Alternatively, the output filter capacitance can be
  reduced while maintaining the same peak-to-peak transient response.
  BASIC PRINCIPLE
  The term “active voltage positioning” (AVP) refers to
  setting the power supply output voltage at a point that is
  dependent on the load current. At minimum load, the
  output voltage is set to a slightly higher than nominal level.
  At full load, the output voltage is set to a slightly lower than
  nominal level. Effectively, the DC load regulation is
  degraded, but the load transient voltage deviation will be …

Articles

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  High Voltage Step-Down Controller Delivers High Power with Minimum Number of Components &mdash LT Journal
  PDF, 248 Kb, File published: Nov 22, 2006
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  DESIGN IDEAS L High Voltage Step-Down Controller
  Delivers High Power with Minimum
  Number of Components
  by Stephanie Dai and Theo Phillips Introduction
  The LTC3824 is a non-synchronous
  buck controller that accepts inputs
  from 4V to 60V and is robust in the
  presence of large input transient
  voltages (FigureВ 1). It draws just
  40ВµA of quiescent current in Burst
  Mode operation, prolonging run time
  in battery-powered applications. To
  handle the wide range of temperatures
  found in automotive and industrial
  applications, the LTC3824 comes in
  a thermally enhanced 10-pin MSE
  package. 12V/2A from a
  Wide Input Voltage Range A typical LTC3824 application (FigureВ 2) can deliver up to 2A of
  continuous load current, and provides
  up to 90% efficiency at 1A (FigureВ 3).
  Sturdy 2A, 8V gate drivers accommodate industrial high voltage P-channel
  MOSFETs. By using a P-FET as a main
  switch, the controller is able to operate …

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  Reduce the Size and Cost of High Current, High-Power-Density Systems with Tracking Dual, 2-Phase Constant Frequency Step-Down Regulator &mdash LT Journal
  PDF, 335 Kb, File published: Nov 22, 2006
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  L DESIGN FEATURES Reduce the Size and Cost of High
  Current, High-Power-Density Systems
  with Tracking Dual, 2-Phase Constant
  Frequency Step-Down Regulator
  by Wilson Zhou and Henry Zhang Introduction
  PolyPhaseВ® power converters offer
  several advantages over single phase
  converters, including higher efficiency,
  smaller size and lower capacitor ripple
  currents. The LTC3828 is a 2-phase,
  constant frequency, dual synchronous
  buck controller that minimizes both
  the size and total cost of the power
  system. 4.7ВµF The LTC3828 offers voltage tracking with flexibility of start-up control,
  a fixed internal start-up time and an
  adjustable external soft-start. Multiple
  LTC3828s can be daisy-chained in applications that require more than two
  tracked and synchronized voltages.
  The LTC3828 is well suited to
  high current and high density power
  + VIN PGOOD INTVCC
  TG2 0.1ВµF BOOST1
  SW1 CMDSH-3 500kHz BG2 …

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Manufacturer's Classification

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > External Power Switch Buck Controllers

Other Names:

LTC3828EGTRPBF, LTC3828EG TRPBF