LTC®4370 Controller

By Analog Devices Inc 230

LTC®4370 Controller

The LTC4370 from Linear Technology is a two-supply current sharing controller which incorporates MOSFET ideal diodes. The diodes block reverse and shoot-through currents during start-up and fault conditions. Their forward voltage is adjusted to share the load currents between supplies. Unlike other sharing methods, neither a share bus nor trim pins on the supply are required.

The maximum MOSFET voltage drop can be set with a resistor. A fast gate turn-on reduces the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse current transients.

The controller operates with supplies from 2.9 V to 18 V. For lower rail voltages, an external supply is needed at the VCC pin. Enable inputs can be used to turn off the MOSFET and put the controller in a low current state. Status outputs indicate whether the MOSFETs are on or off. The load sharing function can be disabled to turn the LTC4370 into a dual ideal diode controller.

  • Shares load between two supplies
  • Eliminates need for active control of input supplies
  • No share bus required
  • 16-Lead DFN (4 mm x 3 mm) and MSOP packages
  • No shoot-through current during start-up or faults
  • 0 V to 18 V high side operation
  • Enable inputs
  • MOSFET on status outputs
  • Dual ideal diode mode
  • Blocks reverse current
  • Redundant power supplies
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