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Application Notes

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  Linear Technology Magazine Circuit Collection, Volume IV &mdash AN84
  PDF, 2.4 Мб, Файл опубликован: 1 апр 2000
  Application Note 84 is a collection of "power circuits" from the years 1996 through 1998 as seen in the pages of Linear Technology magazine. This Application Note collects circuits that can output tens of amps to circuits that can operate a handheld device for several years. In addition to a wide variety of traditional power supply circuits (Buck, Boost, Inverting, Flyback, Linear Regulators, etc.) we include circuits for charging batteries, several Power Management circuits as well as circuits that highlight a very low noise switching regulator.
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  Application Note 84
  April 2000 Linear Technology Magazine Circuit Collection, Volume IV
  Power Products
  Richard Markell, Editor
  INTRODUCTION
  Application Note 84 is the fourth in a series that excerpts
  useful circuits from Linear Technology magazine to preserve them for posterity. This application note highlights
  “power” circuits from issue VI:1 (February 1996) through
  issue VIII:4 (November 1998). Another application note
  will feature data conversion, interface and signal processing circuits from the same era. Like its predecessor, AN 66,
  this Application Note includes circuits that can power
  most any system you can imagine, from “server” power
  supplies that generate in excess of 50 amps to micropower systems for portable and handheld equipment.
  Also included are power converters that can be voltage programmed using Intel’s VID code. Charge pump converters, linear regulators and battery charger circuits are
  included here, with Li-Ion batteries receiving extra attention. There are, of course, circuits that cannot be so simply
  categorized. Come browse. I’ll get out of the way and let
  the authors describe their creations.
  Note: Article Titles appear in this application note exactly
  as they originally appeared in Linear Technology magazine. This may result in some inconsistency in the usage
  of terminology. TABLE OF CONTENTS
  Introduction . 1
  REGULATORS—SWITCHING (BUCK)
  New LTCВ®1435–LTC1439 DC/DC Controllers Feature Value and Performance . 4 …

Design Notes

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  Low Dropout 550kHz DC/DC Controller Operates from Inputs as Low as 2V &mdash DN208
  PDF, 88 Кб, Файл опубликован: 2 июл 1999
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  advertisement Low Dropout 550kHz DC/DC Controller Operates from Inputs
  as Low as 2V – Design Note 208
  San Hwa Chee
  The LTC ®1622 is a versatile high efficiency step-down
  controller that easily meets the size requirements of
  handheld portable applications with its small MSOP
  package. High frequency of operation (550kHz) allows the use of small magnetics, providing a complete
  power solution while occupying only a small amount
  of area. For even smaller magnetics, the LTC1622 can
  be synchronized up to 750kHz. Its wide operating
  input voltage range (2V to 8.5V) allows the part to be
  powered from a single or two lithium-ion batteries or
  2-to 6-cell NiCd and NiMH battery packs.
  The LTC1622 uses a constant frequency, current mode
  architecture, that provides excellent AC and DC load and
  line regulation. Its OPTI-LOOPВ® compensation allows
  the transient response to be optimized while removing
  the constraints placed on COUT, such as limits on low
  ESRs. Burst Mode® operation enhances efficiency at
  low load current while 100% duty cycle allows low
  dropout for extended operating time in battery-operated
  systems. Peak inductor current is set by an external
  sense resistor, allowing the design to be optimized for …

Статьи

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  LTC1622: Low Input Voltage, Current Mode PWM Buck Converter &mdash LT Journal
  PDF, 245 Кб, Файл опубликован: 1 ноя 1998
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  DESIGN FEATURES LTC1622: Low Input Voltage,
  Current Mode PWM Buck Converter
  by San-Hwa Chee
  Introduction
  750kHz. High frequency operation
  allows the use of small inductors,
  making this part ideal for communications products. The LTC1622 comes
  in a tiny 8-lead MSOP package, providing a complete power solution while
  occupying only a small area.
  The LTC1622 uses a pulse-width,
  current mode architecture, which
  provides excellent AC and DC load
  and line regulation. Peak inductor
  current is set by an external sense
  resistor. This allows the design to be
  optimized for each application. A softstart pin allows the LTC1622 to power
  up gently. A Detailed Look
  at the LTC1622
  The LTC1622 is a constant-frequency,
  pulse-width-modulated, current
  mode switching regulator. In normal
  operation, the external P-channel
  power MOSFET is turned on during …

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  Using Current Sensing Resistors with Hot Swap Controllers and Current Mode Voltage Regulators &mdash LT Journal
  PDF, 142 Кб, Файл опубликован: 1 сен 2003
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  DESIGN IDEAS Using Current Sensing Resistors with
  Hot Swap Controllers and Current
  by Eric Trelewicz
  Mode Voltage Regulators
  Introduction
  Current mode switching regulators
  and Hot Swap controllers—such as the
  LTC1622 regulator and the LTC4210
  Hot Swap controller—use a sub-50mV
  voltage across a sense resistor in a
  high-current (Amps to tens of Amps)
  path to control the current. Failure
  to properly Kelvin sense the current
  across the sense resistor is the most
  common cause of circuit malfunction
  in current mode power supplies and
  Hot Swap circuits.
  Problems usually arise when the
  layout of the circuit does not take into
  account the high currents and small
  resistances involved. For instance, a
  low value precision sense resistor in the
  mО© range is typically used to measure …

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