5V boost converter

admin February 17, 2011 4 Comments

5V Boost Converter circuit .

Description.
A simple 5V boost converter using LTC3440 is shown here. LTC3440 is a highly efficient DC to DC converter that can be operated from input voltages below, above or equal to the output voltage. In terms of synchronous rectification, LTC3440 provides up to 96% efficiency and up to 600mA of output current is guaranteed. The IC has a built in synchronizable oscillator whose frequency whose frequency can be adjusted from 300 KHz to 2 MHz.

In the circuit LTC3440 is wired as a 5V boost converter capable of delivering a steady 5V output @ 300mA from an input voltage from 2.7 to 4.2 V. Resistor R4 is used to set the oscillator frequency while resistors R1 and R2 is used to set the output to 5 volts. Resistor R3 and capacitor C1 forms a frequency compensation network while C3 serves as the input bypass capacitor. S1 is the shutdown switch and C2 is the output filter capacitor.

Circuit diagram of boost converter using LTC3440



Notes.

  • Closing switch S1 will shutdown the IC.
  • Circuit can be powered from anything between 2.7 to 4.2V DC.
  • Diode D1 must be placed as close to the IC as possible on the PCB.
  • C1, C2, C3 are ceramic capacitors.
Comments
  • wafi
    December 10, 2014

    what the maximum output for this boost regulator?

  • Tanmay
    April 25, 2011

    IC LTC3440 AND DIODE MBRM120T3 ARE NOT AVAILBLE
    CAN YOU TELL ME WHIC TYPE OF capacitors.ARE THEY

  • February 17, 2011

    “2.7 to 42 V” ?
    or 4.2V

    • john
      February 17, 2011

      Thanks!!…its been corrected…:)

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