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LT1373

Notas de Diseño

• Descargar
  250kHz, 1mA I Q Constant Frequency Switcher Tames Portable Systems Power &mdash DN108
  PDF, 73 Kb, Archivo publicado: jul 2, 1995
  Extracto del documento

  advertisement 250kHz, 1mA IQ Constant Frequency Switcher Tames
  Portable Systems Power – Design Note 108
  Bob Essaff
  DC-to-DC power conversion remains one of the toughest tasks for portable system designers. Dealing with
  various battery technologies and output voltage requirements dictate the need for creative circuit solutions. The
  two circuits discussed are tailored for operation from
  a single lithium-ion (Li-Ion) cell. These new batteries
  are п¬Ѓnding widespread use due to their high energy
  storage capabilities. The п¬Ѓrst circuit has a 3.3V output
  and the second circuit has both 5V and –5V outputs
  for applications requiring dual supplies.
  At the heart of each circuit is the LTВ®1373 current mode
  switching regulator. Guaranteed to operate down to
  2.7V, this part allows the full energy storage capacity
  of a single Li-Ion battery to be used. The LT1373 draws
  only 1mA of quiescent current for high efficiency at
  light loads and has a low resistance 1.5A switch for
  good efficiency at higher loads. Switching at 250kHz
  saves space by reducing the size of the magnetics,
  and the п¬Ѓxed-frequency switching also reduces the
  noise spectrum generated. To avoid sensitive system
  frequencies the part can be externally synchronized
  to a speciп¬Ѓc frequency from 300kHz to 360kHz. The …

• Descargar
  Monolithic DC/DC Converters Break Speed Limits to Shrink Board Space &mdash DN125
  PDF, 80 Kb, Archivo publicado: marzo 2, 1996
  Extracto del documento

  advertisement Monolithic DC/DC Converters Break 1MHz to
  Shrink Board Space – Design Note 125
  Mitchell Lee
  In the never-ending quest for board space, operating
  frequency remains the most important variable in a
  DC/DC converter design. Higher frequency equates
  with smaller coils and capacitors. A new family of fast
  monolithic converters that allows circuit designers to
  reduce the size of their п¬Ѓnished products is now available. Other improvements include quiescent currents
  well below those of slower converters and a new switchdrive technique that reduces dynamic losses by at least
  four fold over previous methods, virtually eliminating
  these losses as a concern in efficiency calculations.
  Table 1 shows the salient features of each member of
  the family. Each is configured as a grounded-switch
  step-up converter, but is equally useful in positive
  and negative high efficiency buck, SEPIC, inverting
  and flyback circuits. The converters are all based
  on the LT В®1372 design, which operates at 500kHz,
  draws 4mA quiescent current and contains a 1.5A,
  0.5О© switch. The LT1371 is designed for higher
  power applications, with a 3A, 0.25О© switch. Supply
  current and operating frequency remain unchanged.
  Reduced quiescent current (1mA) makes the LT1373 …

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Clasificación del fabricante

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