Datasheet Linear Technology LT8610

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Design Notes

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  42V, 2.5A Synchronous Step-Down Regulator with 2.5ОјA Quiescent Current &mdash DN504
  PDF, 97 Kb, File published: May 30, 2012
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  42V, 2.5A Synchronous Step-Down Regulator with 2.5ВµA
  Quiescent Current
  Design Note 504
  Hua (Walker) Bai
  Introduction
  The LTВ®8610 and LT8611 are 42V, 2.5A synchronous
  step-down regulators that meet the stringent high
  input voltage and low output voltage requirements of
  automotive, industrial and communications applications. To minimize external components and solution
  size, the top and bottom power switches are integrated
  in a synchronous regulator topology, including internal
  compensation. The regulator consumes only 2.5ОјA
  quiescent current from the input source even while
  regulating the output.
  High Efficiency Synchonous Operation
  Replacing an external Schottky diode with an internal
  synchronous power switch not only minimizes the solution size, but also increases efficiency and reduces power
  dissipation. The efficiency improvement is significant
  in low output voltage applications where the voltage
  drop of the Schottky diode represents a relatively large
  portion of the output voltage. Figure 1 shows a 12V
  to 3.3V circuit. Figure 2 shows the efficiency of this
  circuit reaching 94%, which is 5% to 10% higher than …

Articles

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  Minimize Standby Current in Automotive DDR Supplies &mdash LT Journal
  PDF, 3.5 Mb, File published: Jul 9, 2013
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  July 2013 I N T H I S I S S U E straighten out your power
  source priorities 8 ВµModule DC/DC combines Volume 23 Number 2 Minimize Standby Current in
  Automotive DDR Supplies
  David Gilbert high efficiency switching
  with low noise linear
  regulation 18 reference clock distribution
  for a 325MHz IF sampling
  system with over 30MHz
  bandwidth, 64dB SNR and
  80dB SFDR 26 near noiseless ADC drivers
  for imaging 31 When you turn on a laptop or a smart phone, you expect
  to wait for it to boot up, but you are less patient when you
  turn on your car. With a car, consumers expect immediate
  access to computer electronics, including navigation and
  infotainment systems, and automobile manufacturers strive to
  meet this desire with design strategies that shorten start-up
  time. One such strategy is to keep dynamic memory (RAM)
  active at all times, even during the ignition-off state.
  The DDR3 memory used in automobiles operates on a 1.5V rail with peak load currents over
  2A—preferably produced by a high efficiency DC/DC converter to minimize heat dissipation. In
  these applications, light load efficiency is just as important to preserve battery life when the automobile is not
  running. DDR memory can consume 1m A–10m A from the
  1.5V rail in standby, but drawing 10m A from the battery …

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Manufacturer's Classification

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