Datasheet Linear Technology LTC1700

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Design Notes

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  Tiny and Efficient Boost Converter Generates 5V at 3A from 3.3V Bus &mdash DN280
  PDF, 71 Kb, File published: Mar 2, 2002
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  advertisement Tiny and Efficient Boost Converter Generates 5V at 3A
  from 3.3V Bus – Design Note 280
  Dongyan Zhou
  applications, Burst ModeВ® operation can be disabled
  when the SYNC/MODE pin is pulled low or driven by
  an external clock. The LTC1700 can be synchronized
  to an external clock ranging from 400kHz to 750kHz. Introduction
  Circuits that require 5V remain popular despite the fact
  that modern systems commonly supply a 3.3V power
  bus, not 5V. The tiny LTCВ®1700 is optimized to deliver 5V
  from the 3.3V bus at very high efficiency, though it can
  also efficiently boost other voltages. The small MSOP
  package and 530kHz operation promote small surface
  mount circuits requiring minimal board space, perfect
  for the latest portable devices. By taking advantage of
  the synchronous rectifier driver, the LTC1700 provides
  up to 95% efficiency. To keep light load efficiency high
  in portable applications, the LTC1700 draws only 180ОјA
  in sleep mode. The LTC1700 features a start-up voltage
  as low as 0.9V, adding to its versatility. 3.3V Input, 5V/3A Output Boost Regulator
  Figure 1 shows a 3.3V input to 5V output boost regulator which can supply up to 3A load current. Figure 2
  shows that the efficiency is greater than 90% for a load
  current range of 200mA to 3A and stays above 80% all …

Articles

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  High Efficiency Synchronous PWM Controller Boosts 1V to 3.3V or 5V &mdash LT Journal
  PDF, 245 Kb, File published: Feb 1, 2001
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  DESIGN FEATURES High Efficiency Synchronous PWM
  Controller Boosts 1V to 3.3V or 5V
  by San-Hwa Chee
  Introduction
  CPU power supplies continue to fall
  toward the 1V level, although other
  circuits still require the traditional
  3.3V or 5V rails. Since the LTC1700 is
  capable of operating at an input voltage as low as 0.9V, it can boost the
  latest CPU power supply voltages to
  provide the missing 3.3V or 5V rail.
  The LTC1700 uses a constant
  frequency, current mode PWM architecture but does not require a current sense resistor; instead, it senses the
  VDS across the external N-channel
  MOSFET. This reduces component
  count and improves high load current efficiency. Efficiency is further
  increased at high load currents
  through the use of a synchronous
  P-channel MOSFET. With Burst Mode
  operation selected, efficiency at low
  load currents is enhanced, thereby
  providing high efficiency over the C1
  22ВµF L1 …

• Download
  Tiny and Efficient Boost Converter Generates 5V at 3A from 3.3V Bus &mdash LT Journal
  PDF, 60 Kb, File published: May 1, 2002
  Extract from the document

  DESIGN IDEAS Tiny and Efficient Boost Converter
  Generates 5V at 3A from 3.3V Bus
  by Dongyan Zhou
  Introduction
  Circuits that require 5V remain popular despite the fact that modern
  systems commonly supply a 3.3V
  power bus, not 5V. The tiny LTC1700
  is optimized to deliver 5V from the
  3.3V bus at very high efficiency,
  though it can also efficiently boost
  other voltages. The small MSOP package and 530kHz operation promote
  small surface mount circuits requiring minimal board space, perfect for
  the latest portable devices. By taking
  advantage of the synchronous rectifier driver, the LTC1700 provides up
  to 95% efficiency. To keep light load
  efficiency high in portable applications, the LTC1700 draws only 180ВµA
  in sleep mode. The LTC1700 features
  a start-up voltage as low as 0.9V,
  adding to its versatility.
  The LTC1700 uses a constant frequency, current mode PWM control
  scheme. Its No RSENSEв„ў feature means
  the current is sensed at the main
  MOSFET, eliminating the need for a …

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Manufacturer's Classification

• Power Management > Switching Regulator > Step-Up (Boost) Regulators > External Power Switch Boost