LTC4443 Datasheet, PDF (1/12 Pages) Linear Technology – High Speed Synchronous N-Channel MOSFET Drivers

FEATURES
n _{Integrated Schottky Diode}
n _{Wide VCC Range: 6V to 9.5V}
n _{38V Maximum Input Supply Voltage}
n _{Adaptive Shoot-Through Protection}
n _{2.4A Peak Pull-Up Current}
n _{5A Peak Pull-Down Current}
n _{8ns TG Fall Time Driving 3000pF Load}
n _{12ns TG Rise Time Driving 3000pF Load}
n _{Separate Supply to Match PWM Controller}
n _{Drives Dual N-Channel MOSFETs}
n _{Undervoltage Lockout}
n _{Low Profile (0.75mm) 3mm × 3mm DFN Package}
APPLICATIONS
n _{Distributed Power Architectures}
n _{High Density Power Modules}
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Synchronous Buck Converter Driver
V_IN
32V
BOOST
V_CC
6V
V_LOGIC
TG
V_CC LTC4443 TS
PWM
IN
BG
GND
V_OUT
4443 TA01a
LTC4443/LTC4443-1
High Speed Synchronous
N-Channel MOSFET Drivers
DESCRIPTION
The LTC^®4443 is a high frequency gate driver with integrated
bootstrap Schottky diode designed to drive two N-channel
MOSFETs in a synchronous buck DC/DC converter topology.
The powerful driver capability reduces switching losses
in MOSFETs with high gate capacitance.
The LTC4443 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 LTC4443 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 Schottky diode required for the bootstrapped supply
is integrated to simplify layout and reduce parts count.
The LTC4443 contains undervoltage lockout circuits on
both the driver and logic supplies that turn off the external
MOSFETs when an undervoltage condition is present.
The LTC4443 and LTC4443-1 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 LTC4443/LTC4443-1 are available in a tiny 3mm ×
3mm DFN package.
LTC4443 Driving 3000pF Capacitive Loads
INPUT (IN)
5V/DIV
BOTTOM
GATE (BG)
5V/DIV
TOP GATE
(TG-TS)
5V/DIV
10ns/DIV
4443 TA01b
4443fa
1