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LTC4443-1 Dataheets PDF



Part Number LTC4443-1
Manufacturers Linear Technology
Logo Linear Technology
Description High Speed Synchronous N-Channel MOSFET Drivers
Datasheet LTC4443-1 DatasheetLTC4443-1 Datasheet (PDF)

www.DataSheet4U.com LTC4443/LTC4443-1 High Speed Synchronous N-Channel MOSFET Drivers FEATURES n n n n n n n n n n n n 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 LTC4443 features a separate supply for the input logic to match the signal swing of the contro.

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www.DataSheet4U.com LTC4443/LTC4443-1 High Speed Synchronous N-Channel MOSFET Drivers FEATURES n n n n n n n n n n n n 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 LTC4443 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 LTC4443 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. Integrated Schottky Diode Wide VCC Range: 6V to 9.5V 38V Maximum Input Supply Voltage Adaptive Shoot-Through Protection 2.4A Peak Pull-Up Current 5A Peak Pull-Down Current 8ns TG Fall Time Driving 3000pF Load 12ns TG Rise Time Driving 3000pF Load Separate Supply to Match PWM Controller Drives Dual N-Channel MOSFETs Undervoltage Lockout Low Profile (0.75mm) 3mm × 3mm DFN Package APPLICATIONS n n Distributed Power Architectures High Density Power Modules L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Synchronous Buck Converter Driver VIN 32V BOOST VCC 6V VLOGIC TG VOUT INPUT (IN) 5V/DIV LTC4443 Driving 3000pF Capacitive Loads VCC LTC4443 TS PWM IN GND BG BOTTOM GATE (BG) 5V/DIV TOP GATE (TG-TS) 5V/DIV 4443 TA01a 10ns/DIV 4443 TA01b 4443fa 1 LTC4443/LTC4443-1 ABSOLUTE MAXIMUM RATINGS (Note 1) www.DataSheet4U.com PIN CONFIGURATION TOP VIEW NC NC TG TS BG GND 1 2 3 4 5 6 12 BOOST 11 BOOST 10 BOOST 9 VCC 8 VLOGIC 7 IN Supply Voltage VLOGIC .................................................... –0.3V to 10V VCC......................................................... –0.3V to 10V BOOST – TS ........................................... –0.3V to 10V BOOST Voltage .......................................... –0.3V to 42V BOOST – VCC ............................................................38V TS Voltage..................................................... –5V to 38V TS + VCC....................................................................42V IN Voltage .................................................. –0.3V to 10V Driver Output TG (with Respect to TS)....... –0.3V to 10V Driver Output BG........................................ –0.3V to 10V Operating Temperature Range (Note 2).... –40°C to 85°C Junction Temperature (Note 3) ............................. 125°C Storage Temperature Range................... –65°C to 150°C 13 DDMA PACKAGE 12-LEAD (3mm s 3mm) PLASTIC DFN θJA = 43°C/W, θJC = 3°C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH LTC4443EDD#PBF LTC4443IDD#PBF LTC4443EDD-1#PBF LTC4443IDD-1#PBF TAPE AND REEL LTC4443EDD#TRPBF LTC4443IDD#TRPBF LTC4443EDD-1#TRPBF LTC4443IDD-1#TRPBF PART MARKING* LCXH LCXH LCYN LCYN PACKAGE DESCRIPTION 12-Lead (3mm × 3mm) Plastic DFN 12-Lead (3mm × 3mm) Plastic DFN 12-Lead (3mm × 3mm) Plastic DFN 12-Lead (3mm × 3mm) Plastic DFN TEMPERATURE RANGE –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 7V, VTS = GND = 0V, VLOGIC = 5V, unless otherwise noted. SYMBOL VLOGIC IVLOGIC UVLO PARAMETER Operating Range DC Supply Current Undervoltage Lockout Threshold IN = Floating VLOGIC Rising VLOGIC Falling Hysteresis l l ELECTRICAL CHARACTERISTICS Logic Supply (VLOGIC) CONDITIONS MIN 3 TYP MAX 9.5 UNITS V μA V V mV V μA V V mV V V mV 4443fa 730 2.5 2.4 2.75 2.65 100 850 3.0 2.9 Gate Driver Supply (VCC) VCC IVCC UVLO Operating Range DC Supply Current Undervoltage Lockout Threshold IN = Floating VCC Rising (LTC4443) VCC Falling (LTC4443) Hy.


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