LTC4444 Datasheet, PDF (1/12 Pages) Linear Technology – High Voltage Synchronous N-Channel MOSFET Driver

FEATURES
■ _{Bootstrap Supply Voltage to 114V}
■ _{Wide VCC Voltage: 7.2V to 13.5V}
■ _{Adaptive Shoot-Through Protection}
■ _{2.5A Peak TG Pull-Up Current}
■ _{3A Peak BG Pull-Up Current}
■ _{1.2Ω TG Driver Pull-Down}
■ _{0.55Ω BG Driver Pull-Down}
■ _{5ns TG Fall Time Driving 1nF Load}
■ _{8ns TG Rise Time Driving 1nF Load}
■ _{3ns BG Fall Time Driving 1nF Load}
■ _{6ns BG Rise Time Driving 1nF Load}
■ _{Drives Both High and Low Side N-Channel MOSFETs}
■ _{Undervoltage Lockout}
■ _{Thermally Enhanced 8-Pin MSOP Package}
APPLICATIONS
■ _{Distributed Power Architectures}
■ _{Automotive Power Supplies}
■ _{High Density Power Modules}
■ _{Telecommunications}
LTC4444
High Voltage Synchronous
N-Channel MOSFET Driver
DESCRIPTION
The LTC^®4444 is a high frequency high voltage gate driver
that drives two N-channel MOSFETs in a synchronous
DC/DC converter with supply voltages up to 100V. The
powerful driver capability reduces switching losses in
MOSFETs with high gate capacitance. The LTC4444’s
pull-up for the top gate driver has a peak output current
of 2.5A and its pull-down has an output impedance of
1.2Ω. The pull-up for the bottom gate driver has a peak
output current of 3A and the pull-down has an output
impedance of 0.55Ω.
The LTC4444 is configured for two supply-independent
inputs. The high side input logic signal is internally
level-shifted to the bootstrapped supply, which may
function at up to 114V above ground.
The LTC4444 contains undervoltage lockout circuits that
disable the external MOSFETs when activated. The LTC4444
also contains adaptive shoot-through protection to prevent
both MOSFETs from conducting simultaneously.
The LTC4444 is available in the thermally enhanced 8-lead
MSOP package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6677210.
TYPICAL APPLICATION
High Input Voltage Buck Converter
V_CC
7.2V TO 13.5V
PWM1
(FROM CONTROLLER IC)
PWM2
(FROM CONTROLLER IC)
BOOST
V_CC
TG
LTC4444
TINP
TS
BINP
BG
GND
V_IN
100V
(ABS MAX)
V_OUT
4444 TA01a
LTC4444 Driving a 1000pF Capacitive Load
BINP
5V/DIV
BG
10V/DIV
TINP
5V/DIV
TG-TS
10V/DIV
20ns/DIV
4444 TA01b
4444f
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