LTC4440_15 Datasheet, PDF (1/16 Pages) Linear Technology – High Speed, High Voltage High Side Gate Driver

FEATURES
n _{Wide Operating VIN Range: Up to 80V}
n _{Rugged Architecture Tolerant of 100V VIN}
Transients
n _{Powerful 1.5Ω Driver Pull-Down}
n _{Powerful 2.4A Peak Current Driver Pull-Up}
n _{7ns Fall Time Driving 1000pF Load}
n _{10ns Rise Time Driving 1000pF Load}
n _{Drives Standard Threshold MOSFETs}
n _{TTL/CMOS Compatible Inputs with Hysteresis}
n _{Input Thresholds are Independent of Supply}
n _{Undervoltage Lockout}
n _{Low Profile (1mm) SOT-23 (ThinSOT)™ and}
Thermally Enhanced 8-Pin MSOP Packages
APPLICATIONS
n _{Telecommunications Power Systems}
n _{Distributed Power Architectures}
n _{Server Power Supplies}
n _{High Density Power Modules}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 6677210.
LTC4440
High Speed, High Voltage
High Side Gate Driver
DESCRIPTION
The LTC^®4440 is a high frequency high side N-channel
MOSFET gate driver that is designed to operate in ap-
plications with V_IN voltages up to 80V. The LTC4440 can
also withstand and continue to function during 100V V_IN
transients. The powerful driver capability reduces switch-
ing 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
and thermally enhanced 8-lead MSOP packages.
PARAMETER
Max Operating TS
Absolute Max TS
MOSFET Gate Drive
V_CC UV⁺
V_CC UV^–
LTC4440
80V
100V
8V to 15V
6.3V
6.0V
LTC4440-5
60V
80V
4V to 15V
3.2V
3.04V
LTC4440A-5
80V
100V
4V to 15V
3.2V
3.04V
TYPICAL APPLICATION
Synchronous Phase-Modulated Full-Bridge Converter
V_IN
36V TO 72V
100V PEAK TRANSIENT
(ABS MAX)
V_CC
8V TO 15V
LTC4440
V_CC BOOST
INP TG
GND TS
LTC4440 Driving a 1000pF
Capacitive Load
INPUT
(INP)
2V/DIV
V_CC
LTC3722-1
LTC4440
V_CC BOOST
INP TG
GND TS
••
4440 TA01
OUTPUT
(TG – TS)
5V/DIV
For more information www.linear.com/LTC4440
10ns/DIV
4440 F02
4440fb
1