LTC4449 Datasheet | Linear Technology

Features n 4V to 6.5V VCC Operating Voltage n 38V Maximum Input Supply Voltage n Adaptive Shoot-Through Protection n Rail-to-Rail Output Drivers n 3.2A Peak Pull-Up Current n 4.5A Peak Pull-Down Current n 8ns TG Rise Time Driving 3000p F Load n 7ns TG Fall Time Driving 3000p F Load n Separate Supply to Match PWM Controller n Drives Dual N-Channel MOSFETs n Undervoltage Lockout n Low Profile (0.75mm) 2mm × 3mm DFN Package APPLICATIONS n Distributed Power Architectures n High Density Power Modules L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. High Speed Synchronous N-Channel MOSFET Driver DESCRIPTION The LTC®4449 is a high frequency gate driver that is designed to drive two N-Channel MOSFETs in a synchronous DC/DC converter. The powerful rail-to-rail driver capability reduces switching losses in MOSFETs with high gate capacitance. The LTC4449 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 LTC4449 activates a shutdown mode that turns off both external MOSFETs. The input logic signal is internally level-shifted to the bootstrapped supply, which functions at up to 42V above ground. The LTC4449 contains undervoltage lockout circuits on both the driver and logic supplies that turn off the external MOSFETs when an undervoltage condition is present. An adaptive shoot-through protection feature is also built-in to prevent the power loss resulting from MOSFET crossconduction current. The LTC4449 is available in the 2mm × 3mm DFN package. TYPICAL APPLICATION Synchronous Buck Converter Driver VCC 4V TO 6.5V VLOGIC BOOST LTC4449 TG VIN TO 38V TS IN BG VOUT 4449 TA01a LTC4449 Driving 3000p F Capacitive Loads INPUT (IN) 5V/DIV TOP GATE (TG - TS) 5V/DIV BOTTOM GATE (BG) 5V/DIV 10ns/DIV 4449 TA01b 4449fa ABSOLUTE...