LTC4444-5_15 Datasheet, PDF (1/14 Pages) Linear Technology – High Voltage Synchronous N-Channel MOSFET Driver

FEATURES
n _{Bootstrap Supply Voltage to 114V}
n _{Wide VCC Voltage: 4.5V to 13.5V}
n _{Adaptive Shoot-Through Protection}
n _{1.4A Peak Top Gate Pull-Up Current}
n _{1.75A Peak Bottom Gate Pull-Up Current}
n _{1.5Ω Top Gate Driver Pull-Down}
n _{0.75Ω Bottom Gate Driver Pull-Down}
n _{5ns Top Gate Fall Time Driving 1nF Load}
n _{8ns Top Gate Rise Time Driving 1nF Load}
n _{3ns Bottom Gate Fall Time Driving 1nF Load}
n _{6ns Bottom Gate Rise Time Driving 1nF Load}
n _{Drives Both High and Low Side N-Channel MOSFETs}
n _{Undervoltage Lockout}
n _{Thermally Enhanced 8-Pin MSOP Package}
APPLICATIONS
n _{Distributed Power Architectures}
n _{Automotive Power Supplies}
n _{High Density Power Modules}
n _{Telecommunication Systems}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No R_SENSE is a trademark 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 synchro-
nous DC/DC converter with supply voltages up to 100V.
This powerful driver reduces switching losses in MOSFETs
with high gate capacitance.
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. Adaptive
shoot-through protection prevents both MOSFETs from
conducting simultaneously.
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
44445fc
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