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  Robust DC/DC Step-Down Converter in 3mm × 3mm DFN Resists 60V Input Surges &mdash LT Journal
  PDF, 565 Kb, File published: Sep 1, 2009
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  L DESIGN IDEAS Robust DC/DC Step-Down Converter
  in 3mm Г— 3mm DFN Resists 60V
  by Chuen Ming Tan
  Input Surges
  Introduction The LTC3642 comes in compact 3mm
  Г— 3mm DFN and MS8E packages with
  integrated MOSFETs, as shown in
  Figure 2. It is extremely easy to use,
  requiring no loop compensation. The
  3.3V and 5V fixed output versions only
  need two capacitors and an inductor
  for operation (see Figure 3).
  The constant peak switch current
  thresholds of these devices inherently
  protect them from output short circuits. Moreover, each of these devices
  can reduce its peak switch current
  threshold such that smaller input and
  output capacitors can be used.
  When operating with a high input
  voltage source, the LTC3642’s RUN
  pin can be optionally configured to VIN
  10V/DIV 50Вµs/DIV Figure 1. The LTC3642 continues to regulate
  the output despite a >45V spike on the input. 150ВµH VIN …

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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

Other Names:

LTC3642EDDTRPBF, LTC3642EDD TRPBF