LTC4440 Datasheet, PDF (1/12 Pages) Linear Technology – High Speed, High Voltage High Side Gate Driver

FEATURES
s _{Wide Operating VIN Range: Up to 80V}
s _{Rugged Architecture Tolerant of 100V VIN}
Transients
s _{Powerful 1.5Ω Driver Pull-Down}
s _{Powerful 2.4A Peak Current Driver Pull-Up}
s _{7ns Fall Time Driving 1000pF Load}
s _{10ns Rise Time Driving 1000pF Load}
s _{Drives Standard Threshold MOSFETs}
s _{TTL/CMOS Compatible Inputs with Hysteresis}
s _{Input Thresholds are Independent of Supply}
s _{Undervoltage Lockout}
s _{Low Profile (1mm) SOT-23 (ThinSOT)}^TM _{or Thermally}
Enhanced 8-Pin MSOP Packages
U
APPLICATIO S
s _{Telecommunications Power Systems}
s _{Distributed Power Architectures}
s _{Server Power Supplies}
s _{High Density Power Modules}
Final Electrical Specifications
LTC4440
High Speed, High Voltage
High Side Gate Driver
October 2003
DESCRIPTION
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 1.5Ω.
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
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
V_CC
LTC3722-1
LTC4440
V_CC BOOST
INP TG
GND TS
INPUT
(INP)
2V/DIV
••
OUTPUT
(TG – TS)
5V/DIV
4440 TA01
LTC4440 Driving a 1000pF
Capacitive Load
10ns/DIV
4440 F02
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
4440i
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