LTC4443

DESCRIPTION The LTC®4443 is a high frequency gate driver with integrated bootstrap Schottky diode designed to drive two N-channel MOSFETs in a synchronous buck DC/DC converter topology. The powerful driver capability reduces switching losses in MOSFETs with high gate capacitance.

The device features a separate supply for the input logic to match the signal swing of the controller IC. If the input signal is not being driven, the LTC4443 activates a shutdown mode that turns off both external MOSFETs. The input logic signal is internally level-shifted to the bootstrapped supply, which may function at up to 42V above ground. The Schottky diode required for the bootstrapped supply is integrated to simplify layout and reduce parts count

. The device contains undervoltage lockout circuits on both the driver and logic supplies that turn off the external MOSFETs when an undervoltage condition is present. The LTC4443 and LTC4443-1 have different undervoltage lockout thresholds to accommodate a wide variety of applications. An adaptive shoot-through protection feature is also built-in to prevent power loss resulting from MOSFET cross-conduction current.

The LTC4443/LTC4443-1 are available in a tiny 3mm × 3mm DFN package.