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LT1307B

Application Notes

• Download
  Linear Technology Magazine Circuit Collection, Volume III &mdash AN67
  PDF, 1.2 Mb, File published: Sep 1, 1996
  Application Note 67 is a collection of circuits for data conversion, interface and signal processing from the first five years of Linear Technology. This application note includes circuits such as fast video multiplexers for high speed video, an ultraselective bandpass filter circuit with adjustable gain, and a fully differential, 8-channel, 12-bit A/D system. The categories included in this app note are data conversion, interface, filters, instrumentation, video/op amps and miscellaneous circuits.
  Extract from the document

  Application Note 67
  September 1996
  Linear Technology Magazine Circuit Collection, Volume III
  Data Conversion, Interface and Signal Processing
  Richard Markell, Editor
  INTRODUCTION
  Application Note 67 is a collection of circuits from the first
  five years of Linear Technology, targeting data conversion,
  interface and signal processing applications. This
  Application Note includes circuits such as fast video
  multiplexers for high speed video, an ultraselective
  bandpass filter circuit with adjustable gain and a fully differential, 8-channel, 12-bit A/D system. The categories
  included herein are data conversion, interface, filters,
  instrumentation, video/op amps and miscellaneous
  circuits. Application Note 66, which covers power products
  and circuits from Linear Technology ’s first five years, is
  also available from LTC. ARTICLE INDEX
  Data Conversion . 3
  Fully Differential, 8-Channel, 12-Bit A/D System Using the LTCВ®1390 and LTC1410 . 3
  12-Bit DAC Applications . 5
  LTC1329 Micropower, 8-Bit, Current Output DAC Used for Power Supply Adjustment,
  Trimmer Pot Replacement . 7
  12-Bit Cold Junction Compensated, Temperature Control System with Shutdown . 8 …

• Download
  Linear Technology Magazine Circuit Collection, Volume IV &mdash AN84
  PDF, 2.4 Mb, File published: Apr 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.
  Extract from the document

  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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  LT1307 Single-Cell Micropower Fixed-Frequency DC/DC Converter Needs No Electrolytic Capacitors &mdash DN128
  PDF, 102 Kb, File published: Apr 2, 1996
  Extract from the document

  advertisement LT1307 Single-Cell Micropower Fixed-Frequency DC/DC
  Converter Needs No Electrolytic Capacitors – Design Note 128
  Steve Pietkiewicz
  a 1V input. The 10ОјF ceramic output capacitor can be
  obtained from several vendors. Efficiency, detailed
  in Figure 2, exceeds 70% over the 1:500 load range
  of 200ОјA to 100mA at a 1.25V input. Figure 3 shows
  output voltage and inductor current as the load current
  is stepped from 5mA to 55mA. The oscillograph reveals
  substantial detail about the operation of the LT1307. With
  a 5mA load, VOUT (top trace) exhibits a ripple voltage of
  60mV at 4kHz. The device is in Burst ModeВ® operation at
  this output current level. Burst Mode operation enables
  the converter to maintain high efficiency at light loads
  by turning off all circuitry inside the LT1307 except the
  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.
  90 80
  EFFICIENCY (%) Today’s low power boost converter ICs have been
  rejected by designers of products incorporating RF
  communications for two reasons. First, the converters
  use some form of variable-frequency control to maintain acceptable efп¬Ѓciency during periods of light load. …

Articles

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  Small, Portable Altimeter Operates from a Single Cell &mdash LT Journal
  PDF, 44 Kb, File published: May 1, 2002
  Extract from the document

  DESIGN IDEAS Small, Portable Altimeter Operates
  from a Single Cell
  by Todd Owen
  free descent—limited by the engineer's
  parasitic drag—to 3000ft. Subsequent
  deployment of an aerodynamic decelerator (Precision Aerodynamics Icarus
  Omega 190) prevented engineer injury or circuit damage. Aircraft rental
  for testing is available at many local
  airports. Extensive instruction in free
  descent and the use of aerodynamic
  decelerators are highly recommended
  before undertaking testing of this
  nature. Contact USPA at (703) 8363495 for further information. –5V
  D2 10ВµF 10ВµF D1 + Linear Technology Magazine May 2002 R2 performs gain calibration in the
  signal-conditioning circuitry. This
  potentiometer calibrates out any normal variations in part tolerances and
  sets the altimeter for a 100mV change
  in output for every 1000ft of altitude.
  The circuit has some initial offset, as
  well as an offset that is determined by
  barometric pressure variations. You
  can use R3 to R5 to null this offset,
  giving a 0V to 1V output for 0ft to …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > LCD/CCD/OLED Bias | SEPIC Regulators
• Power Management > Switching Regulator > Step-Up (Boost) Regulators > Micropower Boost | Internal Power Switch Boost