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LT1615-1

Design Notes

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  SOT-23 DC/DC Converters Generate Up to В±35V Outputs and Consume Only 20ВµA of Quiescent Current &mdash DN223
  PDF, 74 Kb, File published: Feb 5, 2000
  Extract from the document

  advertisement SOT-23 DC/DC Converters Generate Up to В±35V Outputs and
  Consume Only 20µA of Quiescent Current – Design Note 223
  Bryan Legates
  Today’s portable devices need small power supply solutions that operate with a minimum of supply current.
  To meet these needs, Linear Technology introduces the
  LTВ®1615, LT1615-1, LT1617 and LT1617-1 micropower
  SOT-23 DC/DC converters. With an input voltage range
  as low as 1V and an output voltage range as high as
  В±35V, these devices provide considerable power supply
  design flexibility.
  The LT1615 and LT1615-1 are designed to regulate
  positive output voltages, whereas the LT1617 and
  LT1617-1 are designed to directly regulate negative output voltages without the need for feedback
  level-shifting circuitry. The LT1615 and LT1617 have a
  350mA current limit and a minimum input voltage of
  1.2V, whereas the LT1615-1 and LT1617-1 have a lower,
  100mA current limit and a minimum input voltage of
  1V. All four converters use tiny, low profile inductors
  and capacitors to minimize the overall system footprint
  and cost. With a quiescent current of only 20ОјA and
  a shutdown current of 0.5ОјA, these devices squeeze
  the most life out of any battery-powered application. В±20V Dual-Output Converter
  with Output Disconnect …

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  Tiny Regulators Drive White LED Backlights &mdash DN231
  PDF, 76 Kb, File published: May 1, 2001
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  Tiny Regulators Drive White LED Backlights – Design Note 231
  Dave Kim
  Introduction
  The emergence of color LCD displays in handheld
  information appliances has created the need for a
  small, bright white backlight. Fortunately, the recent
  commercialization of high intensity white LEDs provides
  the perfect solution. These tiny LEDs are capable of
  delivering ample white light without the fragility problems and costs associated with fluorescent backlights
  commonly used in notebook computers. However, they
  do pose a problem—the forward voltage of white LEDs
  can be as high as 4V, precluding powering them directly
  from a single lithium-ion cell.
  This Design Note describes several different circuits that
  may be used to boost and regulate the Li-Ion battery
  voltage to power white LEDs. These circuits provide
  sufficient power to drive multiple white LEDs and are
  small enough to easily п¬Ѓt within cellular telephones and
  handheld computers. VIN
  3V TO
  4.2V LTC1754-5
  C3
  10ОјF …

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  SOT-23 Switching Regulator with Integrated 1A Switch Delivers High Current Outputs in a Small Footprint &mdash DN232
  PDF, 91 Kb, File published: Jun 1, 2001
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  advertisement SOT-23 Switching Regulator with Integrated 1A Switch Delivers
  High Current Outputs in a Small Footprint – Design Note 232
  Albert Wu 5V Local Supply
  Figure 1 shows a typical 3.3V to 5V boost converter
  using the LT1930. The circuit can provide an impressive output current of 480mA while occupying less
  than 0.3" by 0.35" of board area (less than 0.105 in2).
  The efficiency, shown in Figure 2, remains above 83%
  over a wide load current range of 60mA to 450mA,
  reaching 86% at 200mA. The maximum output voltage
  ripple of this circuit is 40mVP-P, which corresponds
  to less than 1% of the nominal 5V output. Figure 3 is
  an oscillograph of the transient response. The lower
  waveform depicts a load step from 200mA to 300mA,
  the middle waveform shows the inductor current and
  the upper waveform shows the output voltage. The
  output voltage remains within 1% of the nominal value
  during the transient steps and displays a nice damped
  response with little ringing.
  L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  of Linear Technology Corporation. All other trademarks are the property of their
  respective owners. 06/00/232_conv L1
  5.6ОјH VIN
  3.3V …

Articles

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  Micropower 5-Lead SOT-23 Switching Regulators Extend Battery Life in Space-Sensitive Applications &mdash LT Journal
  PDF, 238 Kb, File published: Sep 1, 1999
  Extract from the document

  DESIGN FEATURES Micropower 5-Lead SOT-23
  Switching Regulators Extend Battery
  Life in Space-Sensitive Applications
  by Bryan Legates
  Introduction L1
  4.7ВµH VIN
  1.5V TO 3V The LT1615 and LT1617 are pin
  compatible with two other members
  of the PowerSOTв„ў family, the LT1613
  and LT1611, respectively. This allows
  the same board layout to be used to
  evaluate the performance of multiple
  devices. The LT1613 and LT1611 are
  both current mode, constant frequency devices, capable of producing
  larger output currents than the
  LT1615 and LT1617.1 LT1615 2-Cell to 3.3V
  Boost Converter
  A popular supply for many portable
  electronic devices, a 2-cell alkaline to
  3.3V converter with the LT1615 can
  deliver 60mA of load current. The
  circuit is shown in Figure 1 and the
  system efficiency appears in Figure 2. …

Model Line

Manufacturer's Classification

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