LTC4444-5 Datasheet, PDF (1/12 Pages) Linear Technology – High Voltage Synchronous N-Channel MOSFET Driver

FEATURES
■ _{Bootstrap Supply Voltage to 114V}
■ _{Wide VCC Voltage: 4.5V to 13.5V}
■ _{Adaptive Shoot-Through Protection}
■ _{1.4A Peak Top Gate Pull-Up Current}
■ _{1.75A Peak Bottom Gate Pull-Up Current}
■ _{1.5Ω Top Gate Driver Pull-Down}
■ _{0.75Ω Bottom Gate Driver Pull-Down}
■ _{5ns Top Gate Fall Time Driving 1nF Load}
■ _{8ns Top Gate Rise Time Driving 1nF Load}
■ _{3ns Bottom Gate Fall Time Driving 1nF Load}
■ _{6ns Bottom Gate 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}
■ _{Telecommunication Systems}
L, 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.
LTC4444-5
High Voltage Synchronous
N-Channel MOSFET Driver
DESCRIPTION
The LTC^®4444-5 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 LTC4444-5’s
pull-up for the top gate driver has a peak output current
of 1.4A and its pull-down has an output impedance of
1.5Ω. The pull-up for the bottom gate driver has a peak
output current of 1.75A and the pull-down has an output
impedance of 0.75Ω.
The LTC4444-5 is configured for two supply-indepen-
dent inputs. The high side input logic signal is internally
level-shifted to the bootstrapped supply, which may func-
tion at up to 114V above ground.
The LTC4444-5 contains undervoltage lockout circuits
that disable the external MOSFETs when activated.
The LTC4444-5 also contains adaptive shoot-through
protection to prevent both MOSFETs from conducting
simultaneously.
The LTC4444-5 is available in the thermally enhanced
8-lead MSOP package.
For a similar driver in this product family, please refer to
the chart below.
PARAMETER
Shoot-Through Protection
Absolute Max TS
MOSFET Gate Drive
V_CC UV⁺
V_CC UV^–
LTC4444-5
Yes
100V
4.5V to 13.5V
4V
3.5V
LTC4446
No
100V
7.2V to 13.5V
6.6V
6.15V
LTC4444
Yes
100V
7.2V to 13.5V
6.6V
6.15V
TYPICAL APPLICATION
High Input Voltage Buck Converter
V_CC
4.5V TO 13.5V
PWM1
(FROM CONTROLLER IC)
PWM2
(FROM CONTROLLER IC)
BOOST
V_CC
TG
LTC4444-5
TINP
TS
BINP
BG
GND
V_IN
100V
V_OUT
44445 TA01a
LTC4444-5 Driving a 1000pF Capacitive Load
BINP
5V/DIV
BG
5V/DIV
TINP
5V/DIV
TG-TS
5V/DIV
20ns/DIV
44445 TA01b
44445fa
1