LTC4444 Linear Technology, LTC4444 Datasheet - Page 7

• Manufacturer Part Number: LTC4444
• Description: High Voltage Synchronous N-Channel MOSFET Driver
• Manufacturer: Linear Technology

Overview
The LTC4444 receives ground-referenced, low voltage
digital input signals to drive two N-channel power MOSFETs
in a synchronous buck power supply confi guration. The
gate of the low side MOSFET is driven either to V
depending on the state of the input. Similarly, the gate of
the high side MOSFET is driven to either BOOST or TS by
a supply bootstrapped off of the switching node (TS).
Input Stage
The LTC4444 employs CMOS compatible input thresholds
that allow a low voltage digital signal to drive standard
BLOCK DIAGRAM
TIMING DIAGRAM
OPERATION
7.2V TO
13.5V
3
9
1
2
V
GND
TINP
BINP
CC
TINP (BINP)
BINP (TINP)
BG (TG)
TG (BG)
V
CC
LDO
UVLO
90%
V
INT
10%
CC
90%
INPUT RISE/FALL TIME < 10ns
or GND,
t
PHL
t
r
NC
5
power MOSFETs. The LTC4444 contains an internal
voltage regulator that biases both input buffers for high
side and low side inputs, allowing the input thresholds
(V
V
false triggering due to noise during switching transitions.
However, care should be taken to keep both input pins
(TINP and BINP) from any noise pickup, especially in high
frequency, high voltage applications. The LTC4444 input
buffers have high input impedance and draw negligible
input current, simplifying the drive circuitry required for
the inputs.
CC
IH
ANTISHOOT-THROUGH
. The 450mV hysteresis between V
= 2.75V, V
LEVEL SHIFTER
LEVEL SHIFTER
PROTECTION
HIGH SIDE
LOW SIDE
V
6
CC
BOOST
10%
90%
IL
10%
t
= 2.3V) to be independent of variations in
PLH
t
f
V
CC
4444 TD
TG
BG
TS
7
8
4
4444 BD
www.DataSheet4U.com
UP TO 100V
IH
V
and V
IN
LTC4444
IL
eliminates
7
4444f