Datasheet Linear Technology LT1376

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LT1375 LT1375 LT1375HV LT1376HV

Design Notes

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  Dual Output Regulator Uses Only One Inductor &mdash DN100
  PDF, 90 Kb, File published: Mar 1, 1994
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  advertisement Dual Output Regulator Uses Only One Inductor – Design Note 100
  Carl Nelson
  Many modern circuit designs still need a dual polarity
  supply. Communication and data acquisition are typical areas where both 5V and –5V are needed for some
  of the IC chips. It would be nice if a single switching
  regulator could supply both outputs with good regulation and a minimum of magnetic components. The
  circuit in FigureВ 1 is a good example of exploiting the
  best advantages of components and topologies to
  achieve a very small, dual output regulator with a single
  magnetic component.
  D2
  1N914 INPUT
  6V
  TO 25V INPUT BOOST LT1376-5
  VSW C2
  0.1ОјF L1*
  10ОјH OUTPUT
  5V BIAS
  SENSE
  SHDN GND VC +
  GND C3
  22ОјF
  35V …

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  Capacitor and EMI Considerations New High Frequency Switching Regulators &mdash DN95
  PDF, 82 Kb, File published: Jan 1, 1995
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  advertisement Capacitor and EMI Considerations for New High Frequency
  Switching Regulators – Design Note 95
  Carl Nelson and Bob Essaff Capacitor Technology Considerations
  At lower frequencies, magnetics dominates the size of
  DC-to-DC converters, but at frequencies above 200kHz
  the largest component is typically the input and output
  bypass capacitors. This makes it important to pick the
  right capacitor technology in critical size applications.
  The most important parameter in choosing the capacitor
  is cost versus size and impedance. The input and output
  capacitors must have low impedance at the switching
  frequency to limit voltage ripple and power dissipation.
  It is also desirable to have low impedance at much higher
  frequencies because high amplitude narrow spikes are
  created if the capacitor has even a few nH of inductance.
  The amplitude of these spikes is determined by the
  rate-of-rise of current (dl/dt) fed to the capacitor. For
  a high speed converter, dl/dt may be as high as 0.5A/
  ns. Even 3nH of capacitor lead inductance will create
  (0.5 e9) (3 e–9) = 1.5V spikes. The second part of this
  Design Note shows how to attenuate these spikes using
  parasitic PC board elements.
  Figure 1 details the impedance characteristics of the …

Articles

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  The LT1576: 200kHz, 1.5A Monolithic Buck Converter &mdash LT Journal
  PDF, 125 Kb, File published: Jun 1, 1999
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  DESIGN FEATURES The LT1576: 200kHz, 1.5A Monolithic
  Buck Converter
  by Lenny Hsiu
  Introduction
  The LT1576 is an improved version of
  the LT1376 1.5A buck switching regulator from Linear Technology. With
  its 200kHz switching frequency and
  integral switch, only a few external,
  surface mount components are
  required to produce a complete switching regulator. All the features of the
  LT1376 have been retained, including current mode control, external
  synchronization and a low current
  (typically 20ВµA) shutdown mode.
  Improvements have been made to
  reduce the start-up input supply
  headroom and the switching noise.
  The quiescent current has been
  reduced by one half. The feedback
  voltage has been lowered from 2.42V
  to 1.21V for low output voltage applications. Improved power -device
  layout also lowers the equivalent resistance of the on-chip switch from
  0.3Ω to 0.2Ω. LT1576 Features
  вќЏ Constant 200kHz switching …

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Manufacturer's Classification

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