DESCRIPTION
The LTC4440 is a high frequency high side N-channel
MOSFET gate driver that is designed to operate in applica-
tions with voltages up to 80V. The LTC4440 can also
withstand and continue to function during 100V tran-
sients. The powerful driver capability reduces switching
losses in MOSFETs with high gate capacitances. The
LTC4440’s pull-up has a peak output current of 2.4A and
its pull-down has an output impedance of 1.5Ω.
The LTC4440 features supply independent TTL/CMOS
compatible input thresholds with 350mV of hysteresis.
The input logic signal is internally level-shifted to the
bootstrapped supply, which may function at up to 115V
above ground.
The LTC4440 contains both high side and low side under-
voltage lockout circuits that disable the external MOSFET
when activated.
The LTC4440 is available in the low profile (1mm) SOT-23
or a thermally enhanced 8-lead MSOP package.
FEATURES
Wide Operating VIN Range: Up to 80V
Rugged Architecture Tolerant of 100V V Transients
Powerful 1.5Ω Driver Pull-Down
Powerful 2.4A Peak Current Driver Pull-Up
7ns Fall Time Driving 1000pF Load
10ns Rise Time Driving 1000pF Load
Drives Standard Threshold MOSFETs
TTL/CMOS Compatible Inputs with Hysteresis
Input Thresholds are Independent of Supply
Undervoltage Lockout
Low Profile (1mm) SOT-23 (ThinSOT) or Thermally
Enhanced 8-Pin MSOP Packages
APPLICATIONS
Telecommunications Power Systems
Distributed Power Architectures
Server Power Supplies
High Density Power Modules
TYPICAL APPLICATION
Synchronous Phase-Modulated Full-Bridge Converter
LTC4440 Driving a 1000pF Capacitive Load
MS8E PACKAGE
S6 PACKAGE
BLOCK DIAGRA
DIAGRA
Capacitance Seen by TG During Switching
P/N Package
LTC4440ES6 SOT23-6
LTC4440EMS8E MSOP-8