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LTC4440 Datasheet

  • LTC4440

  • High Speed, High Voltage High Side Gate Driver

  • 12頁

  • LINER

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Final Electrical Specifications
LTC4440
High Speed, High Voltage
High Side Gate Driver
October 2003
FEATURES
s
s
DESCRIPTION
The LTC
廬
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鈥檚 pull-up has a peak output current of 2.4A and
its pull-down has an output impedance of 1.5鈩?
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.
s
s
s
s
s
s
s
s
s
Wide Operating V
IN
Range: Up to 80V
Rugged Architecture Tolerant of 100V V
IN
Transients
Powerful 1.5鈩?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
or Thermally
Enhanced 8-Pin MSOP Packages
APPLICATIO S
s
s
s
s
Telecommunications Power Systems
Distributed Power Architectures
Server Power Supplies
High Density Power Modules
TYPICAL APPLICATIO
V
IN
36V TO 72V
100V PEAK TRANSIENT
(ABS MAX)
V
CC
8V TO 15V
Synchronous Phase-Modulated Full-Bridge Converter
LTC4440 Driving a 1000pF
Capacitive Load
LTC4440
V
CC
BOOST
INP
GND
TG
TS
INPUT
(INP)
2V/DIV
LTC4440
V
CC
LTC3722-1
V
CC
BOOST
INP
GND
TG
TS
4440 TA01
OUTPUT
(TG 鈥?TS)
5V/DIV
鈥?/div>
鈥?/div>
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.
U
U
U
4440i
1

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