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LT1070 LT1070HV LT1071

Application Notes

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  LT1070 Design Manual &mdash AN19
  PDF, 656 Kb, Language: en, File published: Jun 1, 1986, Pages: 80
  Application Note 19. This design manual is an extensive discussion of all standard switching configurations for the LT1070; including buck, boost, flyback, forward, inverting and "Cuk." The manual includes comprehensive information on the LT1070, the external components used with it, and complete formulas for calculating component values.
  Extract from the document

  Application Note 19
  June 1986
  LT1070 Design Manual
  Carl Nelson
  INTRODUCTION
  Three terminal monolithic linear voltage regulators appeared almost 20 years ago, and were almost immediately
  successful for a variety of reasons. In particular, there
  were relatively few engineers capable of designing a good
  linear voltage regulator. The new devices were also easy to
  use, and inexpensive. In currently popular parlance they
  were "expert systems," containing a good deal of their
  designer's knowledge in silicon form. Because of these
  advantages, the regulators quickly eclipsed discrete and
  earlier monolithic building blocks and dominated the
  market.
  More recently, there has been increasing interest in switching-based regulators. Switching regulators, with their
  high efficiency and small size, are increasingly desirable
  as overall package sizes have shrunk. Unfortunately, switching regulators are also one of the most difficult linear
  circuits to design. Mysterious modes, sudden failures,
  peculiar regulation characteristics and just plain explosions are common occurrences during the design of a
  switching regulator.
  Most switching regulator ICs are building blocks. Many
  discrete components are required, and substantial expertise is assumed on the part of the user. Some newer …

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  Switching Regulators for Poets: A Gentle Guide for the Trepidatious &mdash AN25
  PDF, 359 Kb, File published: Sep 2, 1987
  Subtitled "A Gentle Guide for the Trepidatious," this is a tutorial on switching regulator design. The text assumes no switching regulator design experience, contains no equations, and requires no inductor construction to build the circuits described. Designs detailed include flyback, isolated telecom, off-line, and others. Appended sections cover component considerations, measurement techniques and steps involved in developing a working circuit.
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  Application Note 25
  September 1987 Switching Regulators for Poets
  A Gentle Guide for the Trepidatious
  Jim Williams
  The above title is not happenstance and was arrived at after
  considerable deliberation. As a linear IC manufacturer, it is
  our goal to encourage users to design and build switching
  regulators. A problem is that while everyone agrees that
  working switching regulators are a good thing, everyone
  also agrees that they are difficult to get working. Switching
  regulators, with their high efficiency and small size, are
  increasingly desirable as overall package sizes shrink.
  Unfortunately, switching regulators are also one of the
  most difficult linear circuits to design. Mysterious modes,
  sudden, seemingly inexplicable failures, peculiar regulation characteristics and just plain explosions are common
  occurrences. Diodes conduct the wrong way. Things get
  hot that shouldn’t. Capacitors act like resistors, fuses
  don’t blow and transistors do. The output is at ground, and
  the ground terminal shows volts of noise.
  Added to this poisonous brew is the regulator’s feedback
  loop, sampled in nature and replete with uncertain phase
  shifts. Everything, of course, varies with line and load
  conditions— and the time of day, or so it seems. In the face …

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  Some Thoughts on DC-DC Converters &mdash AN29
  PDF, 1.2 Mb, File published: Oct 1, 1988
  This note examines a wide range of DC/DC converter applications. Single inductor, transformer, and switched-capacitor converter designs are shown. Special topics like low noise, high efficiency, low quiescent current, high voltage, and wide-input voltage range converters are covered. Appended sections explain some fundamental properties of different types of converters.
  Extract from the document

  Application Note 29
  October 1988
  Some Thoughts on DC/DC Converters
  Jim Williams and Brian Huffman
  INTRODUCTION
  Many systems require that the primary source of DC power
  be converted to other voltages. Battery driven circuitry is
  an obvious candidate. The 6V or 12V cell in a laptop computer must be converted to different potentials needed for
  memory, disc drives, display and operating logic. In theory,
  AC line powered systems should not need DC/DC converters
  because the implied power transformer can be equipped
  with multiple secondaries. In practice, economics, noise
  requirements, supply bus distribution problems and other
  constraints often make DC/DC conversion preferable. A
  common example is logic dominated, 5V powered systems
  utilizing В±15V driven analog components.
  The range of applications for DC/DC converters is large,
  with many variations. Interest in converters is commensurately quite high. Increased use of single supply powered
  systems, stiffening performance requirements and battery
  operation have increased converter usage.
  Historically, efficiency and size have received heavy emphasis. In fact, these parameters can be significant, but
  often are of secondary importance. A possible reason
  behind the continued and overwhelming attention to size …

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  Switching Regulator Circuit Collection &mdash AN30
  PDF, 606 Kb, File published: Feb 1, 1989
  Switching regulators are of universal interest. Linear Technology has made a major effort to address this topic. A catalog of circuits has been compiled so that a design engineer can swiftly determine which converter type is best. This catalog serves as a visual index to be browsed through for a specific or general interest.
  Extract from the document

  Application Note 30
  February 1989
  Switching Regulator Circuit Collection
  John Seago
  Switching regulators are of universal interest. Linear
  Technology has made a major effort to address this topic.
  A catalog of circuits has been compiled so that a design
  engineer can swiftly determine which converter type is
  best. This catalog serves as a visual index to be browsed
  through for a specific or general interest. The catalog is organized so that converter topologies can
  be easily found. There are 12 basic circuit categories:
  Battery, Boost, Buck, Buck-Boost, Flyback, Forward, High
  Voltage, Multioutput, Off Line, Preregulator, Switched
  Capacitor and Telecom. Additional circuit information can
  be located in the references listed in the index. The
  reference works as follows, i.e., AN8, Page 2 = Application
  Note 8, Page 2; LTC1044 DS = LTC1044 data sheet;
  DN17 = Design Note 17. DRAWING INDEX
  FIGURE TITLE FIGURE # PAGE REFERENCE/SOURCE Battery
  2A Converter with 150ВµA Quiescent Current (6V to 12V)
  200mA Output Converter (1.5V to 5V)
  Up Converter (6V to 15V)
  Regulated Up Converter (5V to 10V) …

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  Linear Circuits for Digital Systems &mdash AN31
  PDF, 1.5 Mb, File published: Feb 2, 1989
  Subtitled "Some Affable Analogs for Digital Devotees," discusses a number of analog circuits useful in predominantly digital systems. VPP generators for flash memories receive extensive treatment. Other examples include a current loop transmitter, dropout detectors, power management circuits, and clocks.
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  Efficiency and Power Characteristics of Switching Regulator Circuits &mdash AN46
  PDF, 2.6 Mb, File published: Nov 1, 1991
  Efficiency varies for different DC/DC converters. This application note compares the efficiency characteristics of some of the more popular types. Step-up, step-down, flyback, negative-to-positive, and positive-to-negative are shown. Appended sections discuss how to select the proper aluminum electrolytic capacitor and explain power switch and output diode loss calculations.

Design Notes

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  A Battery Powered Lap Top Computer Power Supply &mdash DN18
  PDF, 90 Kb, File published: Dec 1, 1988
  Extract from the document

  A Battery Powered Lap Top Computer Power Supply
  Design Note 18
  Brian Huffman
  Most battery powered lap top computers require regulated multiple output potentials. Problems associated
  with such a supply include magnetic and snubber design,
  loop compensation, short circuit protection, size and
  efficiency. Typical output power requirements include
  5V @ 1A for memory and logic circuitry and В±12V
  @ 300mA to drive the analog components. Primary
  power may be either a 6V or 12V battery. The circuit
  in Figure 1 meets all these requirements. The LTВ®1071
  simplifies the power supply design by integrating most
  of the switching regulator building blocks. Also, the
  off-the-shelf transformer eliminates all the headaches
  associated with the magnetic design.
  The circuit is a basic flyback regulator. The transformer
  transfers the energy from the 12V input to the 5V and
  В±12V outputs. Figure 2 shows the voltage (trace A) and
  the current (trace B) waveforms at the VSW pin. The
  VSW output is a collector of a common emitter NPN,
  so current flows through it when it is low. The circuit’s
  40kHz repetition rate is set by the LT1071’s internal
  oscillator. During the VSW (trace A) “on” time, the input …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > SEPIC Regulators
• Power Management > Switching Regulator > Step-Up (Boost) Regulators > Internal Power Switch Boost