LTC4370 Datasheet | Linear Technology

t A t A t SHARING ERROR (IVINA - IVINB)/ IL (%) t LTC4370 Two-Supply Diode-OR Current Balancing Controller Fea ures n Shares Load Between Two Supplies n Eliminates Need for Active Control of Input Supplies n No Share Bus Required n Blocks Reverse Current n No Shoot-Through Current During Start-Up or Faults n 0V to 18V High Side Operation n Enable Inputs n MOSFET On Status Outputs n Dual Ideal Diode Mode n 16-Lead DFN (4mm × 3mm) and MSOP Packages pplica ions n Redundant Power Supplies n High Availability Systems and Servers n Tele and Network Infrastructure L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Power Path and Thin SOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7920013 and 8022679. Additional patent pending. Descrip ion The LTC®4370 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 2.9V to 18V. 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. Typical VINA 12V pplica ion 12V, 10A Load Share 39n F- SUM85N03-06P 0.1µF NC EN1 CPO1 VCC GND RANGE VIN1 GATE1...