Datasheet Linear Technology LTC3250ES6-1.5#TRPBF

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Design Notes

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  New Step-Down Charge Pumps are Tiny, Efficient and Very Low Noise &mdash DN310
  PDF, 126 Kb, File published: 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 …

Articles

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  Inductorless, Low Noise Step-Down DC/DC Converter Saves Space and Provides Efficient 1.5V Output &mdash LT Journal
  PDF, 143 Kb, File published: Aug 9, 2004
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  DESIGN IDEAS Inductorless, Low Noise Step-Down
  DC/DC Converter Saves Space and
  Provides Efficient 1.5V Output by Bill Walter
  Introduction
  Linear Technology’s new LTC32501.5 switched capacitor step-down DC/
  DC converter squeezes into the tightest spaces while providing up to
  250mA of output current at 1.5V from
  a single 3.1V to 5.5V supply. To keep
  the converter footprint small, the
  LTC3250 operates at high frequency,
  allowing the use of tiny low cost ceramic capacitors—no inductors are
  required. The LTC3250 is available in
  a tiny 6-pin ThinSOT package making it possible to build a complete
  converter in an area of less than
  0.04in2, as shown on the board in
  FigureвђЈ 1.
  The LTC3250 uses a 2-to-1
  switched capacitor fractional conversion mode to achieve a 50% efficiency
  improvement over that of a linear
  regulator. A single input and output
  capacitor, and an external flying capacitor are all that is needed for
  operation.
  The LTC3250 also features Burst …

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Manufacturer's Classification

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

Other Names:

LTC3250ES6-1.5TRPBF, LTC3250ES6-1.5 TRPBF, LTC3250ES61.5#TRPBF, LTC3250ES6 1.5#TRPBF