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TOPIC: LTC3245 - Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump

Re: LTC3245 - Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump 5 years 6 months ago #16623

  • Jon Chandler
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LTC3245 - Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump

Powering a micro circuit from a variety of sources can be a challenge.  Linear regulators are a simple choice to drop a supply voltage to that needed by the circuit.  A switching buck supply will reduce voltage a with high efficiency but are usually more complicated than a linear regulator.  In the case where the supply voltage is less than the circuit requires, a switching boost regulator can handle the task, but again with additional complexities.

Imagine a switching regulator that could handle any supply voltage from 2.7 volts to 38 volts and provide the circuit 3.3 volts or 5 volts at up to 250 mA.  That would be pretty sweet and would allow us to use our circuit with almost any DC source.  if you've ever looked at a circuit diagram to do this, it's pretty complex, with a lot of components...

Not anymore!  Linear Technology has developed the LTC3245 that does all this magic with just 3 capacitors!

Brief information is below.  For more information, click here.

  • 2.7V to 38V VIN Range 
  • IQ = 18μA Operating; 4μA in Shutdown 
  • 12V to 5V Efficiency = 81% 
  • Multimode Operation (2:1, 1:1, 1:2) with Automatic Mode Switching 
  • Low Noise, Constant Frequency Operation 
  • Pin Selectable Burst Mode ® Operation 
  • VOUT: Fixed 3.3V, 5V or Adjustable (2.5V to 5V) 
  • IOUT Up to 250mA 
  • Overtemperature and Short-Circuit Protection 
  • Operating Junction Temperature: 150°C Maximum 
  • Thermally Enhanced 12-Pin MSOP and Low Profile 12-Pin (3mm x 4mm) DFN Packages

Typical Application

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