Datasheet

1
LTC4440
4440f
High Speed, High Voltage
High Side Gate Driver
Wide Operating V
IN
Range: Up to 80V
Rugged Architecture Tolerant of 100V V
IN
Transients
Powerful 1.5 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)
TM
and
Thermally Enhanced 8-Pin MSOP Packages
Telecommunications Power Systems
Distributed Power Architectures
Server Power Supplies
High Density Power Modules
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC
®
4440 is a high frequency high side N-channel
MOSFET gate driver that is designed to operate in applica-
tions with V
IN
voltages up to 80V. The LTC4440 can also
withstand and continue to function during 100V V
IN
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 1.5.
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
and thermally enhanced 8-lead MSOP packages.
V
CC
INP
GND
BOOST
TG
TS
LTC4440
V
IN
36V TO 72V
100V PEAK TRANSIENT
(ABS MAX)
V
CC
8V TO 15V
V
CC
INP
GND
BOOST
TG
TS
LTC4440
V
CC
LTC3722-1
••
4440 TA01
Synchronous Phase-Modulated Full-Bridge Converter
ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents, including 6677210.
INPUT
(INP)
2V/DIV
OUTPUT
(TG – TS)
5V/DIV
10ns/DIV 4440 F02
LTC4440 Driving a 1000pF
Capacitive Load
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
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