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Application Notes

• Download
  Linear Technology Magazine Circuit Collection, Volume II &mdash AN66
  PDF, 1.1 Mb, File published: Aug 1, 1996
  Application Note 66 is a compendium of "power circuits" from the first five years of Linear Technology. This application note contains circuits that can power most any system you can imagine, from desktop computer systems to micropower systems for portable and handheld equipment. Also included here are circuits that provide 300W or more of power factor corrected DC from a universal input. Battery chargers are included, some that charge several battery types, some that are optimized to charge a single type. MOSFET drivers, high side switches and H-bridge driver circuits are also included, as is an article on simple thermal analysis.
  Extract from the document

  Application Note 66
  August 1996 Linear Technology Magazine Circuit Collection, Volume II
  Power Products
  Richard Markell, Editor
  INTRODUCTION
  Application Note 66 is a compendium of “power circuits”
  from the first five years of Linear Technology. The objective
  is to collect the useful circuits from the magazine into
  several applications notes (another, AN67, will collect
  signal processing circuits into one Application Note) so
  that valuable “gems” will not be lost. This Application Note
  contains circuits that can power most any system you can
  imagine, from desktop computer systems to micropower
  systems for portable and handheld equipment. Also included here are circuits that provide 300W or more of
  power factor corrected DC from a universal input. Battery
  chargers are included, some that charge several battery
  types, some that are optimized to charge a single type.
  MOSFET drivers, high side switches and H-bridge driver
  circuits are also included, as is an article on simple thermal
  analysis. With these introductory remarks, I’ll stand aside
  and let the authors describe their circuits. ARTICLE INDEX
  REGULATORS—SWITCHING (BUCK)
  High Power (>4A) …

Design Notes

• Download
  Dual Regulators Power PentiumВ® Processor or Upgrade CPU &mdash DN122
  PDF, 73 Kb, File published: Feb 1, 1996
  Extract from the document

  advertisement Dual Regulators Power Pentium Processor or Upgrade CPU
  Design Note 122
  Craig Varga
  Many manufacturers of Pentium processor-based
  motherboards have been searching for an economical
  solution to the problem of powering the present generation Pentium P54C and accommodating the upgrade
  processors that will soon become available. The existing
  processor uses a single supply for both the processor
  core and the I/O. For the highest frequency offerings,
  the supply required is 3.5V ±100mV (VRE specification).
  For the lower performance end of the clock frequency
  spectrum, a supply voltage of 3.3V В±5% is adequate.
  Recently, Intel respecified the standard 3.3V CPUs for
  operation at 3.5V. This allows designs for any clock
  frequency to be operated from a single 3.5V supply. The
  I/O ring and chipset should be powered by the same
  voltage as the CPU core, whether that is 3.3V or 3.5V.
  The P55C upgrade processor, which will soon be available, requires separate supplies for the core and the I/O.
  The nominal core voltage is targeted at 2.500V В±5%,
  whereas the I/O supply is still nominally 3.3V. There is
  also a processor pin, VCC2DET, at location AL1, that is
  bonded to ground on the P55C, but is open on the P54C.
  A signiп¬Ѓcant complication is introduced by the core …

• Download
  Fast Regulator Paces High Performance Processors &mdash DN87
  PDF, 85 Kb, File published: Oct 1, 1994
  Extract from the document

  advertisement Fast Regulator Paces High Performance Processors
  Design Note 87
  Mitchell Lee and Craig Varga
  New high performance microprocessors require a
  fresh look at power supply transient response. Pentium
  processors, for example, have current demands that go
  from a low idle mode of 200mA to a full load current of
  4A in 20ns. A transition of the same magnitude occurs
  as the processor reenters its power saving mode. In
  addition, the overall supply tolerances have been narrowed significantly from the traditional ±5% for 5V
  supplies and include transient conditions. When all
  possible DC error terms are accounted for, the transient
  response of the power supply when subject to the load
  step mentioned above must be within В±46mV!
  To address this problem Linear Technology has developed the LTВ®1585 linear regulator. It features 1% initial
  accuracy, excellent temperature drift and load regulation,
  and virtually perfect line regulation. Complementing superb DC characteristics, the LT1585 exhibits extremely
  fast response to transients. The regulator is offered as
  an adjustable regulator requiring two resistors to set the
  operating point, as well as п¬Ѓxed versions which have
  been trimmed and optimized for 3.3V, 3.38V, 3.45V,
  and 3.6V outputs. Fixed versions are fully specified for
  worst-case DC error bounds; in adjustable designs the …

• Download
  High Efficiency Power Sources for Pentium TM Processors &mdash DN90
  PDF, 85 Kb, File published: Nov 1, 1994
  Extract from the document

  advertisement High Efficiency Power Sources for Pentium Processors
  Design Note 90
  Craig Varga
  When the processor draws large transient currents,
  the 5V supply will be perturbed. In all “buck” type
  switching regulators there is an inductor in the path
  between the raw input supply and the load. This has
  the effect of limiting the rise time of the input currents
  and minimizing the disturbance to the 5V supply.
  However, the typical cheap off-line “brick” supply has
  L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered
  trademarks of Linear Technology Corporation. All other trademarks are the property
  of their respective owners.
  100
  5VIN
  90
  EFFICIENCY (%) In many applications, particularly portable computers,
  the efficiency of power conversion is critical both from
  the standpoint of battery life and thermal management.
  Desktop machines may also benefit from higher efficiency, particularly a “green PC.” While linear regulators
  can offer low cost and high performance solutions, they
  can only offer 67% efficiency in 5V to 3.3V applications.
  Switching regulators are more efп¬Ѓcient and minimize …

• Download
  5V to 3.3V Circuit Collection &mdash DN91
  PDF, 74 Kb, File published: Nov 1, 1994
  Extract from the document

  advertisement 5V to 3.3V Circuit Collection – Design Note 91
  Richard Markell and Craig Varga
  High Efficiency 3.3V Regulator
  INPUT
  VOLTAGE
  5V + 6
  VIN
  7
  3 IPGM SHDN 8 3.3V Battery-Powered Supply with Shutdown
  8 3w
  22ОјF*
  25V LBIN 50μH† GND 1N5818 + 2w
  47ОјF**
  16V 4 * AVX TPSD226K025
  ** AVX TPSD476K016
  † COILTRONICS CTX50-4 OUT 1 LT1121-3.3 5V
  5 1
  VOUT
  LTC1174-3.3
  2
  5
  LBOUT
  SW IN 0.1ОјF + 1ОјF …

Model Line

Manufacturer's Classification

• Power Management > LDO Linear Regulators > Positive Linear Regulators (LDO)

Other Names:

LT1585CMTRPBF, LT1585CM TRPBF