Multiphase 60V synchronous boost controller

The LTC3897 from Linear Technology is a multiphase synchronous boost DC/DC controller with input 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.

The input surge stopper, with adjustable clamp voltage, controls the gate of an N-channel MOSFET to protect against high input voltage transients of greater than 100V and provides inrush current control, overcurrent protection and output disconnect.

The integrated ideal diode controller drives another N-channel MOSFET for reverse input voltage protection and voltage holdup or peak detection.

The LTC3897 is suitable for automotive, industrial and medical systems where a step-up DC/DC converter is needed to deliver high power in a small solution size.

The device is said to be configurable to regulate a 24V/10A output from a car battery at up to 97% efficiency. The LTC3897 has a low 55µA quiescent current in Burst Mode operation and operates from an input voltage ranging from 4.5 to 65V, with 75V peak.

It can regulate an output voltage of 60V and the on board adjustable 5V to 10V gate drivers can slew large logic-level or standard threshold MOSFET gates.

The LTC3897 current mode control architecture uses a phase-lockable frequency from 75kHz to 850kHz or fixed frequency adjustable from 50kHz to 900kHz.

In addition, the device features adjustable cycle-by-cycle current limit and can use a sense resistor or monitor the voltage drop across the inductor for current sensing.

The LTC3897 is available in TSSOP-38 and 5 x 7mm QFN-38 packages. Three temperature grades are available, ranging from –40 to 150°C.