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  New Step-Down Charge Pumps are Tiny, Efficient and Very Low Noise &mdash DN310
  PDF, 126 Kb, 档案已发布: May 1, 2003
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  Step-Down Charge Pumps Are Tiny, Efficient
  and Very Low Noise – Design Note 310
  William Walter
  Introduction
  Inductorless charge pump DC/DC converters are popular
  in space-constrained applications with 10mA to 500mA
  load currents. Such converters are available in small
  packages, operate with very low quiescent current and
  require minimal external components. However, the
  downside for most charge pumps is noise. Noise that
  is generated at the power input can interfere with RF
  transmission and reception in wireless applications, and
  noise at the output can couple into sensitive circuits
  or even create audible noise. The new LTCВ®3250 and
  LTC3251 step-down charge pumps solve this problem
  with a new switching architecture that mitigates noise
  without sacrificing any of the space saving, high efficiency benefits typical of charge pump converters.
  The LTC3250-1.5 is optimized for applications that require up to 250mA of current from a п¬Ѓxed 1.5V output,
  and where space is at an absolute premium. The LTC3251
  provides more flexibility in a slightly larger footprint:
  it features an adjustable output voltage (0.9V to 1.6V),
  up to 500mA output, ultralow input and output noise
  and spread spectrum operation. Both ICs use 2-to-1 …

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• Power Management > Inductorless (Charge Pump) DC/DC Converters > Regulated Step-Down Charge Pumps

其他名称:

LTC3251EMSEPBF, LTC3251EMSE PBF