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  Tiny Step-Up/Step-Down Power Supply Delivers 3.3V at 1.3A in Battery-Powered Devices &mdash DN271
  PDF, 74 Kb, 档案已发布: Nov 1, 2001
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  Tiny Step-Up/Step-Down Power Supply Delivers 3.3V at 1.3A in
  Battery-Powered Devices – Design Note 271
  Keith Szolusha
  Introduction
  Many of today’s cellular phones, PDAs, MP3 players and
  other portable devices require that a consistent 3.3V
  power supply be delivered from a single, rechargeable
  lithium-ion battery. The problem is that a Li-Ion battery
  at full charge has a voltage somewhat higher than 3.3V
  and loses voltage over the life of a charge to less than
  3.3V. A power supply that depends on a Li-Ion requires
  a voltage regulator that can maintain consistent 3.3V
  output from both high and low inputs. Since typical
  Li-Ion applications are portable mass-market devices
  where the focus is on short time-to-market, long battery
  life, small size and low cost, the regulator must take
  minimal space, be highly efficient and use inexpensive
  off-the-shelf components wherever possible. Regulated Output Voltage from a Range of Inputs
  Although a SEPIC is only one of many possible configurations for a DC/DC converter, it has a major advantage
  over other choices when applied in a modern portable
  device. The SEPIC in Figure 1 delivers 3.3V output
  throughout the input voltage range, 2.7V to 4.2V. One
  alternative to the SEPIC conп¬Ѓguration is a simple stepdown converter. A step-down converter delivers 3.3V …

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制造商分类

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

其他名称:

LTC1872ES6PBF, LTC1872ES6 PBF