LTC3897-2 Datasheet | Analog Devices

Features Poly Phase® Synchronous Boost Controller with Input/Output Protection DESCRIPTION n Input Supply Range: 4.5V to 65V (Up to 75V Surge) n Reverse Input Protection to - 40V n Inrush Current Control, Overcurrent Protection and Output Disconnect for Boost Converter n Input Voltage Surge Protection with Adjustable Clamp Voltage n Onboard Ideal Diode Controller n Low Quiescent Current: 55µA n 2-Phase Operation Reduces Required Input and Output Capacitance and Noise n Output Voltage Up to 60V n Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) for Logic-Level or Standard Threshold FETs n No External Bootstrap Diodes Required n 5mm × 9mm QFN-44 Package with High Voltage Pin Spacing APPLICATIONS n Industrial n Automotive n Military/Avionics n Telemunications The LTC®3897-2 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. All registered trademarks and trademarks are the property of their respective owners. Protected by U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. POWER LOSS (m W) TYPICAL APPLICATION 24V/10A 2-Phase Synchronous Boost Converter with Surge...