- Published: Friday, 10 January 2014
- Written by Jon Chandler
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