LTC4447IDD#PBF
LTC4447IDD#PBF Datasheet
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| Part | Datasheet |
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LTC4447IDD#PBF |
LTC4447IDD#PBF (pdf) |
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LTC4447EDD#PBF |
LTC4447EDD#PBF |
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| • Integrated Schottky Diode • 4V to 6.5V VCC Operating Voltage • 38V Maximum Input Supply Voltage • Adaptive Shoot-Through Protection • Rail-to-Rail Output Drivers • 3.2A Peak Pull-Up Current • 4.5A Peak Pull-Down Current • 8ns TG Risetime Driving 3000pF Load • 7ns TG Falltime Driving 3000pF Load • Separate Supply to Match PWM Controller • Drives Dual N-Channel MOSFETs • Undervoltage Lockout • Low 0.75mm 3mm x 3mm DFN Package • Distributed Power Architectures • High Density Power Modules , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LTC4447 High Speed Synchronous N-Channel MOSFET Driver The is a high frequency gate driver with integrated bootstrap Schottky diode 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 LTC4447 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 LTC4447 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 Schottky diode required for the bootstrapped supply is integrated to simplify layout and reduce parts count. The LTC4447 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 LTC4447 is available in the 3mm x 3mm DFN package. Synchronous Buck Converter Driver VCC 4V TO 6.5V VLOGIC BOOST LTC4447 TG VIN TO 38V VOUT 4447 TA01a LTC4447 Driving 3000pF Capacitive Loads INPUT IN 5V/DIV TOP GATE TG - TS 5V/DIV BOTTOM GATE BG 5V/DIV 10ns/DIV 4447 TA01b 4447f LTC4447 ABSOLUTE MAXIMUM RATINGS Note 1 Supply Voltage to 7V to 7V BOOST to 7V BOOST Voltage to 42V BOOST VCC TS + IN Voltage to 7V Driver Output TG with Respect to TS ......... to 7V Driver Output to 7V Operating Temperature Range Note to 85°C Junction Temperature Note 3 125°C Storage Temperature Range................... to 150°C PIN CONFIGURATION TOP VIEW GND 6 12 BOOST 11 BOOST 10 BOOST 9 VCC 8 VLOGIC 7 IN |
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