FeaTures
n
n
LTC4440
High Speed, High Voltage
High Side Gate Driver
DescripTion
The
LTC
®
4440
is a high frequency high side N-channel
MOSFET gate driver that is designed to operate in ap-
plications with V
IN
voltages up to 80V. The LTC4440 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
LTC4440’s pull-up has a peak output current of 2.4A and
its pull-down has an output impedance of 1.5Ω.
The LTC4440 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 115V
above ground.
The LTC4440 contains both high side and low side under-
voltage lockout circuits that disable the external MOSFET
when activated.
The LTC4440 is available in the low profile (1mm) SOT-23
and thermally enhanced 8-lead MSOP packages.
PARAMETER
Max Operating TS
Absolute Max TS
MOSFET Gate Drive
V
CC
UV
+
V
CC
UV
–
LTC4440
80V
100V
8V to 15V
6.3V
6.0V
LTC4440-5
60V
80V
4V to 15V
3.2V
3.04V
LTC4440A-5
80V
100V
4V to 15V
3.2V
3.04V
n
n
n
n
n
n
n
n
n
Wide Operating V
IN
Range: Up to 80V
Rugged Architecture Tolerant of 100V V
IN
Transients
Powerful 1.5Ω Driver Pull-Down
Powerful 2.4A Peak Current Driver Pull-Up
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
Low Profile (1mm) SOT-23 (ThinSOT)™ and
Thermally Enhanced 8-Pin MSOP Packages
applicaTions
n
n
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Telecommunications Power Systems
Distributed Power Architectures
Server Power Supplies
High Density Power Modules
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT 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 72V
100V PEAK TRANSIENT
(ABS MAX)
V
CC
8V TO 15V
LTC4440
V
CC
BOOST
INP
GND
TG
TS
INPUT
(INP)
2V/DIV
LTC4440 Driving a 1000pF
Capacitive Load
LTC4440
V
CC
LTC3722-1
V
CC
BOOST
INP
GND
TG
TS
4440 TA01
•
•
OUTPUT
(TG – TS)
5V/DIV
10ns/DIV
4440 F02
4440fa
For more information
www.linear.com//LTC4440
1
LTC4440
absoluTe MaxiMuM raTings
(Note 1)
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
Peak Output Current < 1µs (TG) ................................. 4A
Driver Output TG (with Respect to TS)....... –0.3V to 15V
Operating Ambient Temperature Range
(Note 2) ..............................................–40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
pin conFiguraTion
TOP VIEW
INP
GND
V
CC
GND
1
2
3
4
9
8
7
6
5
TS
TG
BOOST
NC
V
CC
1
GND 2
INP 3
TOP VIEW
6 BOOST
5 TG
4 TS
MS8E PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 40°C/W (NOTE 4)
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
JMAX
= 125°C,
θ
JA
= 230°C/W
orDer inForMaTion
LEAD FREE FINISH
LTC4440EMS8E#PBF
LTC4440ES6#PBF
TAPE AND REEL
LTC4440EMS8E#TRPBF
LTC4440ES6#TRPBF
PART MARKING
LTF9
LTZY
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
6-Lead Plastic SOT-23
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= V
BOOST
= 12V, V
TS
= GND = 0V, unless otherwise noted.
MIN
TYP
MAX
UNITS
INP = 0V
V
CC
< UVLO Threshold (Falling) – 0.1V
V
CC
Rising
V
CC
Falling
Hysteresis
l
l
250
25
5.7
5.4
6.5
6.2
300
400
80
7.3
7.0
µA
µA
V
V
mV
Bootstrapped Supply (BOOST – TS)
I
BOOST
DC Supply Current
Normal Operation
UVLO
INP = 0V
V
BOOST
– V
TS
< UVLO
HS(FALLING)
– 0.1V, V
CC
= INP = 5V
110
86
180
170
µA
µA
4440fa
2
For more information
www.linear.com/LTC4440
LTC4440
elecTrical characTerisTics
SYMBOL PARAMETER
UVLO
HS
Undervoltage Lockout Threshold
CONDITIONS
V
BOOST
– V
TS
Rising
V
BOOST
– V
TS
Falling
Hysteresis
INP Ramping High
INP Ramping Low
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= V
BOOST
= 12V, V
TS
= GND = 0V, unless otherwise noted.
MIN
6.75
6.25
TYP
7.4
6.9
500
1.6
1.25
0.350
±0.01
I
TG
= –10mA, V
OH
= V
BOOST
– V
TG
I
TG
= 100mA
l
l
l
MAX
7.95
7.60
UNITS
V
V
mV
V
V
V
µA
V
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
l
l
1.3
0.85
2
1.6
±2
Output Gate Driver (TG)
0.7
150
1.7
2.4
1.5
10
100
7
70
30
28
65
65
2.2
220
mV
A
Ω
ns
ns
ns
ns
ns
ns
Switching Timing
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LTC4440 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
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)
Note 4:
Failure to solder the exposed back side of the MS8E package to the
PC board will result in a thermal resistance much higher than 40°C/W.
Typical perForMance characTerisTics
V
CC
Supply Quiescent Current
vs Voltage
300
250
QUIESCENT CURRENT (µA)
200
150
100
50
0
INP = V
CC
QUIESCENT CURRENT (µA)
T
A
= 25°C
500
INP = 0V
450
400
350
300
250
200
150
100
50
0
5
10
V
CC
SUPPLY VOLTAGE (V)
15
4440 G01
BOOST – TS Supply Quiescent
Current vs Voltage
T
A
= 25°C
OUTPUT (TG – TS) VOLTAGE (mV)
170
165
160
155
150
145
140
Output Low Voltage (V
OL
)
vs Supply Voltage
I
TG
= 100mA
T
A
= 25°C
INP = V
CC
INP = 0V
0
0
10
5
BOOST – TS SUPPLY VOLTAGE (V)
15
4440 G02
8
12
14
11
13
9
10
BOOST – TS SUPPLY VOLTAGE (V)
15
4440 G03
4440fa
For more information
www.linear.com//LTC4440
3
LTC4440
Typical perForMance characTerisTics
Output High Voltage (V
OH
)
vs Supply Voltage
15
OUTPUT VOLTAGE (TG – TS) (V)
14
I
TG
= –1mA
I
TG
= –10mA
I
TG
= –100mA
INPUT THRESHOLD (V)
13
12
11
10
9
8
7
8
9
13
14
12
11
BOOST – TS SUPPLY VOLTAGE (V)
10
15
4440 G04
Input Thresholds (INP)
vs Supply Voltage
2.0
1.8
1.6
1.4
1.2
1.0
0.8
V
CC
SUPPLY QUIESCENT CURRENT (µA)
T
A
= 25°C
V
IH
(INPUT HIGH THRESHOLD)
380
360
340
320
300
280
260
240
220
200
V
CC
Supply Current
at TTL Input Levels
T
A
= 25°C
T
A
= 25°C
INP = 2V
V
IL
(INPUT LOW THRESHOLD)
INP = 0.8V
7
9
11
13
V
CC
SUPPLY VOLTAGE (V)
15
4440 G05
8
12
10
V
CC
SUPPLY VOLTAGE (V)
14
4440 G06
2MHz Operation
300
INPUT
(INP)
5V/DIV
CURRENT (µA)
250
200
150
100
50
V
CC
Supply Current (V
CC
= 12V)
vs Temperature
6.55
INP = 0V
V
CC
SUPPLY VOLTAGE (V)
INP = 12V
6.50
6.45
6.40
6.35
6.30
6.25
6.20
–30
0
30
60
90
120
4440 G08
V
CC
Undervoltage Lockout
Thresholds vs Temperature
RISING THRESHOLD
OUTPUT
(TG)
5V/DIV
V
CC
= 12V
250ns/DIV
4440 G07
FALLING THRESHOLD
0
–60
6.15
–60
–30
0
30
60
90
120
4440 G09
TEMPERATURE (°C)
TEMPERATURE (°C)
Boost Supply Current
vs Temperature
500
450
400
CURRENT (µA)
350
300
250
200
150
100
50
0
–60
–30
0
30
60
90
120
4440 G10
Boost Supply (BOOST – TS)
Undervoltage Lockout Thresholds
vs Temperature
7.6
2.0
RISING THRESHOLD
INPUT THRESHOLD (V)
1.8
1.6
1.4
1.2
1.0
BOOST – TS SUPPLY VOLTAGE (V)
7.5
7.4
7.3
7.2
7.1
7.0
6.9
6.8
6.7
–60
–30
0
30
60
90
120
4440 G11
Input Threshold vs Temperature
V
IH
(V
CC
= 12V)
V
IH
(V
CC
= 15V)
V
IH
(V
CC
= 8V)
V
IL
(V
CC
= 12V)
V
IL
(V
CC
= 15V)
V
IL
(V
CC
= 8V)
INP = 12V
INP = 0V
FALLING THRESHOLD
0.8
–60
–30
0
30
60
90
120
4440 G12
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
4440fa
4
For more information
www.linear.com/LTC4440
LTC4440
Typical perForMance characTerisTics
Input Threshold Hysteresis
vs Temperature
500
480
460
420
400
380
360
320
300
–60
–30
0
30
60
90
120
4440 G13
Peak Driver (TG) Pull-Up Current
vs Temperature
3.0
2.9
2.8
PEAK CURRENT (A)
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
–60
–30
0
30
60
90
120
4440 G14
HYSTERESIS (mV)
440
BOOST – TS = 15V
V
IH
-V
IL
(V
CC
= 12V)
V
IH
-V
IL
(V
CC
= 15V)
BOOST – TS = 12V
340 V
IH
-V
IL
(V
CC
= 8V)
TEMPERATURE (°C)
TEMPERATURE (°C)
Output Driver Pull-Down
Resistance vs Temperature
3.0
2.5
2.0
R
DS
( )
1.5
1.0
0.5
0
–60
BOOST – TS = 12V
BOOST – TS = 8V
BOOST – TS = 15V
45
40
PROPAGATION DELAY (ns)
35
30
25
20
15
10
5
–30
0
30
60
90
120
4440 G15
Propagation Delay vs Temperature
(V
CC
= BOOST = 12V)
t
PLH
t
PHL
0
–60
–30
0
30
60
90
120
4440 G16
TEMPERATURE (°C)
TEMPERATURE (°C)
pin FuncTions
SOT-23 Package
V
CC
(Pin 1):
Chip Supply. This pin powers the internal low
side circuitry. A low ESR ceramic bypass capacitor should
be tied between this pin and the GND pin (Pin 2).
GND (Pin 2):
Chip Ground.
INP (Pin 3):
Input Signal. TTL/CMOS compatible input
referenced to GND (Pin 2).
TS (Pin 4):
Top (High Side) Source Connection.
TG (Pin 5):
High Current Gate Driver Output (Top Gate).
This pin swings between TS and BOOST.
BOOST (Pin 6):
High Side Bootstrapped Supply. An
external capacitor should be tied between this pin and
TS (Pin 4). Normally, a bootstrap diode is connected
between V
CC
(Pin 1) and this pin. Voltage swing at this
pin is from V
CC
– V
D
to V
IN
+ V
CC
– V
D
, where V
D
is the
forward voltage drop of the bootstrap diode.
4440fa
For more information
www.linear.com//LTC4440
5
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