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LT1074 LT1074 LT1074HV LT1076 LT1076

Application Notes

• Download
  LT1074/LT1076 Design Manual &mdash AN44
  PDF, 477 Kb, File published: Sep 1, 1991
  This note discusses the use of the LT1074 and LT1076 high efficiency switching regulators. These regulators are specifically designed for ease of use. This application note is intended to eliminate the most common errors that customers make when using switching regulators as well as offering insight into the inner workings of switching designs. There is an entirely new treatment of inductor design based upon simple mathematical formulas that yield direct results. There are extensive tutorial sections devoted to the care and feeding of the Positive Step- Down (Buck) Converter, the Tapped Inductor Buck Converter, the Positive-to-Negative Converter and the Negative Boost Converter. Additionally, many troubleshooting hints are included as well as oscilloscope techniques, soft-start architectures, and micropower shutdown and EMI suppression methods.
  Extract from the document

  Application Note 44
  September 1991
  LT1074/LT1076 Design Manual
  Carl Nelson
  INTRODUCTION
  The use of switching regulators increased dramatically in
  the 1980’s and this trend remains strong going into the
  90s. The reasons for this are simple; heat and efficiency.
  Today’s systems are shrinking continuously, while simultaneously offering greater electronic “horsepower.” This
  combination would result in unacceptably high internal
  temperatures if low efficiency linear supplies were used.
  Heat sinks do not solve the problem in general because
  most systems are closed, with low thermal transfer from
  “inside” to “outside.”
  Battery-powered systems need high efficiency supplies for
  long battery life. Topological considerations also require
  switching technology. For instance, a battery cannot
  generate an output higher than itself with linear supplies.
  The availability of low cost rechargeable batteries has created a spectacular rise in the number of battery-powered
  systems, and consequently a matching rise in the use of
  switching regulators.
  The LTВ®1074 and LT1076 switching regulators are designed
  specifically for ease of use. They are close to the ultimate …

Design Notes

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  High Performance Frequency Compensation Gives DC-to-DC Converter 75Вµs Response With High Stability &mdash DN53
  PDF, 81 Kb, File published: Oct 1, 1991
  Extract from the document

  advertisement High Performance Frequency Compensation Gives DC-to-DC
  Converter 75µs Response with High Stability – Design Note 53
  Ron Vinsant
  This Design Note describes four high performance,
  low cost, 1.75A step-down converter circuits based on
  the LTВ®1076 п¬Ѓve terminal switching regulator. All four
  circuits have exceptional transient response; indeed,
  it is superior to most three terminal linear regulators.
  Transient response is important to loads that are
  switched on and off or that require high peak currents.
  Examples are digital circuits that are turned on and off,
  disk drive motors, stepper motors and linear amplifiers.
  The frequency compensation schemes shown in this
  Design Note, when compared to the usual R and C technique, allow greater variation in output capacitor ESR
  without causing stability problems. This is important
  in applications where wide temperature variations occur (which changes capacitor ESR) such as industrial
  control, automotive and military, and when the use
  of multiple capacitor vendors with different capacitor
  specifications is required.
  Phase margin is always more than 50В° and gain margin
  is a minimum of 18dB. Bode plots are available from
  the factory upon request.
  The efп¬Ѓciency of these circuits is typically 80% with …

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  Low Parts Count DC/DC Converter Circuit With 3.3V and 5V Outputs &mdash DN69
  PDF, 69 Kb, File published: Apr 1, 1993
  Extract from the document

  advertisement Low Parts Count DC/DC Converter Circuit
  with 3.3V and 5V Outputs -Design Note 69
  Ron Vinsant
  This Design Note describes a simple low cost dual output
  step-down converter circuit based on the LTВ®1076 п¬Ѓve
  terminal switching regulator.
  Performance
  Input voltages can range from 8V to 30V. The load range
  on the 5V is 0.05A to 0.5A while the 3.3V load range is
  0.1A to 1A. The circuit is self-protecting under no load
  conditions; it will “burp” in the same fashion as many
  off-line flyback power supplies.
  Output voltage regulation is excellent. Over all load
  and line conditions, including cross regulation, the
  3.3V output varies from 3.25V to 3.27V. The 5V output
  varies from 4.81V to 5.19V under the same conditions.
  In a typical application of 0.5A on the 3.3V and 0.25A
  on the 5V, efficiency is typically 76%. With an input
  voltage of 30V and full load, the efficiency drops to
  66%. In normal operating regions efficiency is always
  better than 70%.
  The 5V ripple is less than 75mV and the 3.3V ripple less
  than 50mV over all line and load conditions. …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > Inverting Regulators
• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Internal Power Switch Buck | High Input Voltage Buck