LTC4442 Datasheet, PDF (1/12 Pages) Linear Technology – High Speed Synchronous N-Channel MOSFET Drivers

FEATURES
■ _{Wide VCC Range: 6V to 9.5V}
■ _{38V Maximum Input Supply Voltage}
■ _{Adaptive Shoot-Through Protection}
■ _{2.4A Peak Pull-Up Current}
■ _{5A Peak Pull-Down Current}
■ _{8ns TG Fall Time Driving 3000pF Load}
■ _{12ns TG Rise Time Driving 3000pF Load}
■ _{Separate Supply to Match PWM Controller}
■ _{Drives Dual N-Channel MOSFETs}
■ _{Undervoltage Lockout}
■ _{Thermally Enhanced MSOP Package}
APPLICATIONS
■ _{Distributed Power Architectures}
■ _{High Density Power Modules}
TYPICAL APPLICATION
Synchronous Buck Converter Driver
V_CC
6V
PWM
V_IN
32V
BOOST
LTC4442
V_LOGIC
TG
V_CC
TS
IN
BG
GND
V_OUT
4442 TA01a
LTC4442/LTC4442-1
High Speed Synchronous
N-Channel MOSFET Drivers
DESCRIPTION
The LTC^®4442 is a high frequency gate driver designed
to drive two N-channel MOSFETs in a synchronous buck
DC/DC converter topology. The powerful driver capabil-
ity reduces switching losses in MOSFETs with high gate
capacitance.
The LTC4442 features a separate supply for the input
logic to match the signal swing of the controller IC. If the
input signal is not being driven, the LTC4442 activates a
shutdown mode that turns off both external MOSFETs.
The input logic signal is internally level-shifted to the
bootstrapped supply, which may function at up to 42V
above ground.
The LTC4442 contains undervoltage lockout circuits on
both the driver and logic supplies that turn off the external
MOSFETs when an undervoltage condition is present.
The LTC4442 and LTC4442-1 have different undervoltage
lockout thresholds to accommodate a wide variety of ap-
plications. An adaptive shoot-through protection feature is
also built-in to prevent power loss resulting from MOSFET
cross-conduction current.
The LTC4442/LTC4442-1 are 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.
LTC4442 Driving 3000pF Capacitive Loads
INPUT (IN)
5V/DIV
BOTTOM
GATE (BG)
5V/DIV
TOP GATE
(TG-TS)
5V/DIV
10ns/DIV
4442 TA01b
4442fa
1