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Notas de aplicación

• Descargar
  Linear Technology Magazine Circuit Collection, Volume IV &mdash AN84
  PDF, 2.4 Mb, Archivo publicado: abr 1, 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.
  Extracto del documento

  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 …

Notas de Diseño

• Descargar
  A New, High Efficiency, Monolithic Synchronous Step-Down Regulator Works with Single or Dual Li-Ion Batteries &mdash DN201
  PDF, 77 Kb, Archivo publicado: marzo 1, 1999
  Extracto del documento

  advertisement High Efficiency, Monolithic Synchronous Step-Down Regulator
  Works with Single or Dual Li-Ion Batteries
  Design Note 201
  Jaime Tseng
  Li-Ion batteries, with their high energy density, are
  becoming the chemistry of choice for designers of
  many handheld products. In response to this growing
  trend, the LTCВ®1627 incorporates features optimized for
  such chemistry. For instance, the LTC1627 integrates a
  precision undervoltage lockout circuit that shuts itself
  down when the supply voltage dips below 2.5V, drawing
  only 6ОјA of quiescent current. This prevents damaging
  a Li-Ion battery when it is nearing its end of charge. The
  operating supply range of the LTC1627 is from 2.65V
  to 8.5V; this accommodates one or two Li-Ion batteries
  and 3-to 6-cell NiCd and NiMH battery packs. of small surface mount inductors. For switching noise
  sensitive applications the LTC1627 can be externally
  synchronized at up to 525kHz by applying a clock signal
  of at least 1.5VP-P to the SYNC/FCB pin.
  Figure 1 shows a typical LTC1627 application circuit
  suitable for a single or dual Li-Ion battery input. Note
  that the Schottky diode normally seen on the SW pin
  is absent in Figure 1—the LTC1627 has no need for it, …

Artículos

• Descargar
  LTC1627 Monolithic Synchronous Step-Down Regulator Maximizes Single or Dual Li-Ion Battery Life &mdash LT Journal
  PDF, 253 Kb, Archivo publicado: agosto 1, 1998
  Extracto del documento

  DESIGN FEATURES LTC1627 Monolithic Synchronous
  Step-Down Regulator Maximizes
  Single or Dual Li-Ion Battery Life
  by Jaime Tseng Introduction Single and Double
  Li-Ion Cell Operation
  The LTC1627, with its operating supply range of 2.65V to 8.5V, can operate
  from one or two Li-Ion batteries as
  well as 3-to 6-cell NiCd and NiMH
  battery packs. Figure 2 shows a typical discharge voltage profile of a single Li-Ion battery. As shown, a fully
  charged single-cell Li-Ion battery
  begins the discharge cycle around 4V
  (it may be slightly higher or lower,
  depending upon the manufacturer’s
  charge-voltage specifications). During the bulk of the discharge time, the
  cell produces between 3.5V and 4.0V.
  Finally, towards the end of discharge,
  the cell voltage drops quickly below
  3V. When the voltage drops further,
  the discharge must be terminated to
  prevent damage to the battery. A precision undervoltage lockout circuit
  trips when the LTC1627’s supply voltage dips below 2.5V, shutting the part
  down to only 5Вµ A of supply current. Maximizing
  Battery Run Time …

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Clasificación del fabricante

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