LTC4444 Linear Technology, LTC4444 Datasheet - Page 6

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

LTC4444
TINP (Pin 1): High Side Input Signal. Input referenced
to GND. This input controls the high side driver output
(TG).
BINP (Pin 2): Low Side Input Signal. This input controls
the low side driver output (BG).
V
and the low side gate driver output directly and the high
side gate driver output through an external diode con-
nected between this pin and BOOST (Pin 6). A low ESR
ceramic bypass capacitor should be tied between this pin
and GND (Pin 9).
BG (Pin 4): Low Side Gate Driver Output (Bottom Gate).
This pin swings between V
NC (Pin 5): No Connect. No connection required.
TYPICAL PERFORMANCE CHARACTERISTICS
PIN FUNCTIONS
6
CC
(Pin 3): Supply. This pin powers input buffers, logic
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
Switching Supply Current vs
Input Frequency
T
V
TS = GND
A
CC
= 25°C
= BOOST = 12V
200
SWITCHING FREQUENCY (kHz)
(BG SWITCHING)
CC
I
BOOST
and GND.
400
(BG SWITCHING)
(TG SWITCHING)
(TG SWITCHING)
I
VCC
I
600
VCC
I
BOOST
800
4444 G18
1000
BOOST (Pin 6): High Side Bootstrapped Supply. An ex-
ternal capacitor should be tied between this pin and TS
(Pin 8). Normally, a bootstrap diode is connected between
V
V
age drop of the bootstrap diode.
TG (Pin 7): High Side Gate Driver Output (Top Gate). This
pin swings between TS and BOOST.
TS (Pin 8): High Side MOSFET Source Connection (Top
Source).
Exposed Pad (Pin 9): Ground. Must be soldered to PCB
ground for optimal thermal performance.
CC
CC
(Pin 3) and this pin. Voltage swing at this pin is from
– V
100
0.1
10
1
D
1
Switching Supply Current vs
Load Capacitance
I
BOOST
to V
(BG SWITCHING
(TG SWITCHING AT 500kHz)
(BG SWITCHING
AT 1MHz)
2
AT 500kHz)
I
IN
(BG SWITCHING AT 1MHz OR 5OOkHz)
VCC
I
3
VCC
LOAD CAPACITANCE (nF)
+ V
I
VCC
4
CC
5
– V
(TG SWITCHING
AT 500kHz)
6
I
(TG SWITCHING
AT 1MHz)
D
BOOST
I
BOOST
, where V
(TG SWITCHING
7
AT 1MHz)
8
I
VCC
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9
D
/ '
10
is the forward volt-
4444f