PolyPhase Synchronous Boost Controller with Input/Output Protection

The LTC3897-2 is a synchronous boost DC/DC controller with surge stopper and ideal diode controller.

The boost controller drives two N-channel power MOSFET stages out-of-phase to reduce input and output capacitor requirements, allowing the use of smaller inductors than the single-phase equivalent. Synchronous rectification reduces power loss and eases thermal requirements.

The surge stopper controls the gate of an external N-channel MOSFET to protect against high voltage input transients and provides inrush current control, overcurrent protection and output disconnect for the boost converter. The integrated ideal diode controller drives another N-channel MOSFET to replace a Schottky diode for reverse input protection and voltage holdup or peak detection. It controls the forward voltage drop across the MOSFET and minimizes reverse current flow.

The differences between the LTC3897-2 and LTC3897 are shown in Table 1.

Applications

* Industrial

* Automotive

* Military/Avionics

* Telecommunications

* Input Supply Range: 4.5V to 65V (Up to 75V Surge)

* Reverse Input Protection to –40V

* Inrush Current Control, Overcurrent Protection and Output Disconnect for Boost Converter

* Input Voltage Surge Protection with Adjustable Clamp Voltage

* Onboard Ideal Diode Controller

* Low Quiescent Current: 55µA