LTC4444_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: 7.2V to 13.5V}
n _{Adaptive Shoot-Through Protection}
n _{2.5A Peak TG Pull-Up Current}
n _{3A Peak BG Pull-Up Current}
n _{1.2Ω TG Driver Pull-Down}
n _{0.55Ω BG Driver Pull-Down}
n _{5ns TG Fall Time Driving 1nF Load}
n _{8ns TG Rise Time Driving 1nF Load}
n _{3ns BG Fall Time Driving 1nF Load}
n _{6ns BG 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 _{Telecommunications}
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
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. This
powerful driver reduces switching losses in MOSFETs with
high gate capacitance.
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. 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
Yes
100V
7.2V to 13.5V
6.6V
6.15V
LTC4446
No
100V
7.2V to 13.5V
6.6V
6.15V
LTC4444-5
Yes
100V
4.5V to 13.5V
4V
3.55V
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
4444fb
1