MOSFET gate driver that is designed to operate in applica-
tions with V
IN
voltages up to 80V. The LTC4440A-5 can
also withstand and continue to function during 100V V
IN
transients. The powerful driver capability reduces switch-
ing losses in MOSFETs with high gate capacitances. The
LTC4440A-5’s pull-up has a peak output current of 1.1A
and its pull-down has an output impedance of 1.85Ω.
The LTC4440A-5 features supply independent TTL/CMOS
compatible input thresholds with 350mV of hysteresis.
The input logic signal is internally level-shifted to the
bootstrapped supply, which may function at up to 95V
above ground.
The LTC4440A-5 is optimized for driving (5V) logic level
FETs and contains an undervoltage lockout circuit that
disables the external MOSFET when activated.
The LTC4440A-5 is available in the thermally enhanced
8-lead MSOP package.
PARAMETER
Max Operating TS
Absolute Max TS
MOSFET Gate Drive
V
CC
UV
+
V
CC
UV
–
LTC4440A-5
80V
100V
4V to 15V
3.2V
3.04V
LTC4440-5
60V
80V
4V to 15V
3.2V
3.04V
LTC4440
80V
100V
8V to 15V
6.3V
6.0V
n
n
n
n
n
n
n
Wide Operating V
IN
Range: Up to 80V
Rugged Architecture Tolerant of 100V V
IN
Transients
Powerful 1.85Ω Driver Pull-Down (with 6V Supply)
Powerful 1.1A Peak Current Driver Pull-Up
(with 6V Supply)
7ns Fall Time Driving 1000pF Load
10ns Rise Time Driving 1000pF Load
Drives Standard Threshold MOSFETs
TTL/CMOS Compatible Inputs with Hysteresis
Input Thresholds are Independent of Supply
Undervoltage Lockout
Thermally Enhanced 8-Lead MSOP Package
applicaTions
n
n
n
n
n
n
Automotive Power Systems
Telecommunications Power Systems
Distributed Power Architectures
Server Power Supplies
High Density Power Modules
General Purpose Low or High Side Driver
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Direct
Flux Limit is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 6677210.
Typical applicaTion
Synchronous Phase-Modulated Full-Bridge Converter
V
IN
36V TO 80V
V
CC
4V TO 15V
LTC4440A-5
V
CC
BOOST
INP
GND
TG
TS
LTC4440A-5 Driving a 1000pF Capacitive Load
TG-TS
2V/DIV
LTC4440A-5
LTC3722-1
V
CC
BOOST
INP
GND
TG
TS
4440A5 TA01
•
•
INP
2V/DIV
50ns/DIV
V
CC
= BOOST-TS = 5V
4440A5 TA02
4440a5f
For more information
www.linear.com/LTC4440A-5
1
LTC4440A-5
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
INP
GND
V
CC
GND
1
2
3
4
9
GND
8
7
6
5
TS
TG
BOOST
NC
Supply Voltage
V
CC
........................................................ –0.3V to 15V
BOOST – TS ........................................... –0.3V to 15V
INP Voltage ................................................ –0.3V to 15V
BOOST Voltage (Continuous) ..................... –0.3V to 95V
BOOST Voltage (100ms) ...........................–0.3V to 115V
TS Voltage (Continuous) ............................... –5V to 80V
TS Voltage (100ms) .................................... –5V to 100V
Operating Junction Temperature Range (Notes 2, 3)
LTC4440AI-5 ..................................... –40°C to 125°C
LTC4440AH-5 .................................... –40°C to 150°C
LTC4440AMP-5 ................................. –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
MS8E PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 40°C/W (NOTE 4)
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC4440AIMS8E-5#PBF
LTC4440AHMS8E-5#PBF
TAPE AND REEL
LTC4440AIMS8E-5#TRPBF
LTC4440AHMS8E-5#TRPBF
PART MARKING*
LTGKP
LTGKP
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
LTC4440AMPMS8E-5#PBF LTC4440AMPMS8E-5#TRPBF LTGKP
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
elecTrical characTerisTics
SYMBOL PARAMETER
Main Supply (V
CC
)
I
VCC
UVLO
DC Supply Current
Normal Operation
UVLO
Undervoltage Lockout Threshold
CONDITIONS
The
●
denotes specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= V
BOOST
= 6V, V
TS
= GND = 0V, unless otherwise noted.
(Note 2)
MIN
TYP
MAX
UNITS
INP = 0V
V
CC
< UVLO Threshold (Falling) – 0.1V
V
CC
Rising
V
CC
Falling
Hysteresis
l
l
200
18
2.75
2.60
3.20
3.04
160
325
40
3.65
3.50
µA
µA
V
V
mV
Bootstrapped Supply (BOOST – TS)
I
BOOST
DC Supply Current
Normal Operation
INP = 0V
INP = 6V
0
310
µA
µA
450
4440a5f
2
For more information
www.linear.com/LTC4440A-5
LTC4440A-5
elecTrical characTerisTics
SYMBOL PARAMETER
Input Signal (INP)
V
IH
V
IL
V
IH
– V
IL
I
INP
V
OH
V
OL
I
PU
R
DS
t
r
t
f
t
PLH
t
PHL
High Input Threshold
Low Input Threshold
Input Voltage Hysteresis
Input Pin Bias Current
High Output Voltage
Low Output Voltage
Peak Pull-Up Current
Output Pull-Down Resistance
Output Rise Time
Output Fall Time
Output Low-High Propagation Delay
Output High-Low Propagation Delay
10% – 90%, C
L
= 1nF
10% – 90%, C
L
= 10nF
10% – 90%, C
L
= 1nF
10% – 90%, C
L
= 10nF
l
l
The
●
denotes specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= V
BOOST
= 6V, V
TS
= GND = 0V, unless otherwise noted.
(Note 2)
CONDITIONS
INP Ramping High
INP Ramping Low
l
l
MIN
1.2
0.8
TYP
1.55
1.25
0.350
±0.01
MAX
2
1.6
±2
UNITS
V
V
V
µA
V
Output Gate Driver (TG)
I
TG
= –10mA, V
OH
= V
BOOST
– V
TG
I
TG
= 100mA
l
l
l
0.7
185
0.7
1.1
1.85
10
100
7
70
35
33
80
80
4
400
mV
A
Ω
ns
ns
ns
ns
ns
ns
Switching Timing
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC4440A-5 is tested under pulsed load conditions such
that T
J
≈ T
A
. The LTC4440AI-5 is guaranteed over the –40°C to 125°C
operating junction temperature range, The LTC4440AH-5 is guaranteed
over the –40°C to 150°C operating junction temperature range and
the LTC4440AMP-5 is tested and guaranteed over the –55°C to 150°C
operating junction temperature range.
High junction temperatures degrade operating lifetimes; operating lifetime
is derated to junction temperatures greater than 125°C. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environment
factors.
Note 3:
T
J
is calculated from the ambient temperature T
A
and power
dissipation PD according to the following formula:
T
J
= T
A
+ (PD •
θ
JA
°C/W)
Continuous operation above the specified absolute operating junction
temperature may impair device reliability or permanently damage the
device.
Note 4:
Failure to solder the exposed pad of the MS8E package to the PC
board will result in a thermal resistance much higher than 40°C/W.
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