LTC4440
High Speed, High Voltage
High Side Gate Driver
FEATURES
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DESCRIPTIO
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)
TM
and
Thermally Enhanced 8-Pin MSOP Packages
The LTC
®
4440 is a high frequency high side N-channel
MOSFET gate driver that is designed to operate in applica-
tions with V
IN
voltages up to 80V. The LTC4440 can also
withstand and continue to function during 100V V
IN
tran-
sients. The powerful driver capability reduces switching
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents, including 6677210.
APPLICATIO S
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Telecommunications Power Systems
Distributed Power Architectures
Server Power Supplies
High Density Power Modules
TYPICAL APPLICATIO
V
IN
36V TO 72V
100V PEAK TRANSIENT
(ABS MAX)
V
CC
8V TO 15V
Synchronous Phase-Modulated Full-Bridge Converter
LTC4440
V
CC
BOOST
INP
GND
TG
TS
INPUT
(INP)
2V/DIV
LTC4440
V
CC
LTC3722-1
V
CC
BOOST
INP
GND
TG
TS
4440 TA01
OUTPUT
(TG – TS)
5V/DIV
•
•
10ns/DIV
4440 F02
U
LTC4440 Driving a 1000pF
Capacitive Load
4440f
U
U
1
LTC4440
ABSOLUTE
MAXIMUM
RATINGS
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
PACKAGE/ORDER INFORMATION
TOP VIEW
INP
GND
V
CC
GND
1
2
3
4
8
7
6
5
TS
TG
BOOST
NC
ORDER PART
NUMBER
LTC4440EMS8E
MS8E
PART MARKING
LTF9
V
CC
1
GND 2
INP 3
9
MS8E PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 40°C/W (NOTE 4)
EXPOSED PAD IS GND (PIN 9)
MUST BE SOLDERED TO PCB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
I
VCC
PARAMETER
DC Supply Current
Normal Operation
UVLO
Undervoltage Lockout Threshold
CONDITIONS
Main Supply (V
CC
)
The
●
denotes 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
●
●
UVLO
Bootstrapped Supply (BOOST – TS)
I
BOOST
DC Supply Current
Normal Operation
UVLO
Undervoltage Lockout Threshold
INP = 0V
V
BOOST
– V
TS
< UVLO
HS(FALLING)
– 0.1V, V
CC
= INP = 5V
V
BOOST
– V
TS
Rising
V
BOOST
– V
TS
Falling
Hysteresis
INP Ramping High
INP Ramping Low
●
●
UVLO
HS
Input Signal (INP)
V
IH
V
IL
V
IH
– V
IL
I
INP
High Input Threshold
Low Input Threshold
Input Voltage Hysteresis
Input Pin Bias Current
●
●
2
U
U
W
W W
U
W
(Note 1)
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
TOP VIEW
6 BOOST
5 TG
4 TS
ORDER PART
NUMBER
LTC4440ES6
S6
PART MARKING
LTZY
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
JMAX
= 125°C,
θ
JA
= 230°C/W
250
25
5.7
5.4
6.5
6.2
300
400
80
7.3
7.0
µA
µA
V
V
mV
110
86
6.75
6.25
7.4
6.9
500
1.6
1.25
0.350
±0.01
180
170
7.95
7.60
µA
µA
V
V
mV
V
V
V
µA
4440f
1.3
0.85
2
1.6
±2
LTC4440
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OH
V
OL
I
PU
R
DS
t
r
t
f
t
PLH
t
PHL
PARAMETER
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
Output Gate Driver (TG)
The
●
denotes 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.
CONDITIONS
I
TG
= –10mA, V
OH
= V
BOOST
– V
TG
I
TG
= 100mA
●
●
●
MIN
TYP
0.7
150
MAX
UNITS
V
220
2.2
mV
A
Ω
ns
ns
ns
ns
1.7
2.4
1.5
10
100
7
70
Switching Timing
10% – 90%, C
L
= 1nF
10% – 90%, C
L
= 10nF
10% – 90%, C
L
= 1nF
10% – 90%, C
L
= 10nF
●
●
30
28
65
65
ns
ns
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 PERFOR A CE CHARACTERISTICS
V
CC
Supply Quiescent Current
vs Voltage
300
250
QUIESCENT CURRENT (µA)
INP = V
CC
200
150
100
50
0
QUIESCENT CURRENT (µA)
T
A
= 25°C
500
INP = 0V
450
400
350
300
250
200
150
100
50
0
0
5
10
V
CC
SUPPLY VOLTAGE (V)
15
4440 G01
OUTPUT (TG – TS) VOLTAGE (mV)
U W
BOOST – TS Supply Quiescent
Current vs Voltage
T
A
= 25°C
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
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
4440f
3
LTC4440
TYPICAL PERFOR A CE CHARACTERISTICS
Output High Voltage (V
OH
)
vs Supply Voltage
15
OUTPUT VOLTAGE (TG – TS) (V)
V
CC
SUPPLY QUIESCENT CURRENT (µA)
T
A
= 25°C
1.8
14
INPUT THRESHOLD (V)
13
I
TG
= –1mA
12
11
10
9
8
7
8
9
12
13
14
11
BOOST – TS SUPPLY VOLTAGE (V)
10
15
4440 G04
I
TG
= –10mA
I
TG
= –100mA
2MHz Operation
300
INPUT
(INP)
5V/DIV
CURRENT (µA)
V
CC
SUPPLY VOLTAGE (V)
OUTPUT
(TG)
5V/DIV
V
CC
= 12V
250ns/DIV
Boost Supply Current
vs Temperature
500
450
400
CURRENT (µA)
INP = 12V
BOOST – TS SUPPLY VOLTAGE (V)
INPUT THRESHOLD (V)
350
300
250
200
150
100
50
0
–60
–30
0
30
60
90
120
4440 G10
INP = 0V
TEMPERATURE (°C)
4
U W
4440 G07
Input Thresholds (INP)
vs Supply Voltage
2.0
T
A
= 25°C
V
IH
(INPUT HIGH THRESHOLD)
V
CC
Supply Current
at TTL Input Levels
380
360
340
320
300
280
INP = 0.8V
260
240
220
200
8
12
10
V
CC
SUPPLY VOLTAGE (V)
14
4440 G06
T
A
= 25°C
INP = 2V
1.6
1.4
1.2
1.0
0.8
7
9
11
13
V
CC
SUPPLY VOLTAGE (V)
15
4440 G05
V
IL
(INPUT LOW THRESHOLD)
V
CC
Supply Current (V
CC
= 12V)
vs Temperature
6.55
INP = 0V
250
INP = 12V
200
150
100
50
0
–60
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
FALLING THRESHOLD
6.15
–60
–30
0
30
60
90
120
4440 G09
TEMPERATURE (°C)
TEMPERATURE (°C)
Boost Supply (BOOST – TS)
Undervoltage Lockout Thresholds
vs Temperature
7.6
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
2.0
RISING THRESHOLD
1.8
1.6
1.4
1.2
1.0
0.8
–60
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)
FALLING THRESHOLD
–30
0
30
60
90
120
4440 G12
TEMPERATURE (°C)
TEMPERATURE (°C)
4440f
LTC4440
TYPICAL PERFOR A CE CHARACTERISTICS
Input Threshold Hysteresis
vs Temperature
500
480
460
HYSTERESIS (mV)
440
420
400
380
360
340 V
IH
-V
IL
(V
CC
= 8V)
320
300
–60
–30
0
30
60
90
120
4440 G13
PEAK CURRENT (A)
Output Driver Pull-Down
Resistance vs Temperature
3.0
2.5
45
40
PROPAGATION DELAY (ns)
2.0
R
DS
(Ω)
BOOST – TS = 12V
BOOST – TS = 8V
1.5
BOOST – TS = 15V
1.0
0.5
0
–60
–30
PI FU CTIO S
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 exter-
nal 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.
4440f
U W
0
30
Peak Driver (TG) Pull-Up Current
vs Temperature
3.0
2.9
2.8
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
BOOST – TS = 15V
V
IH
-V
IL
(V
CC
= 12V)
V
IH
-V
IL
(V
CC
= 15V)
BOOST – TS = 12V
TEMPERATURE (°C)
TEMPERATURE (°C)
Propagation Delay vs Temperature
(V
CC
= BOOST = 12V)
35
30
25
20
15
10
5
t
PLH
t
PHL
60
90
120
4440 G15
0
–60
–30
0
30
60
90
120
4440 G16
TEMPERATURE (°C)
TEMPERATURE (°C)
U
U
U
5
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