LTC4440AMPMS8E-5#TRPBF 数据手册
LTC4440A-5
High Speed, High Voltage,
High Side Gate Driver
Features
Description
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The LTC®4440A-5 is a high frequency high side N-channel
MOSFET gate driver that is designed to operate in applications with VIN voltages up to 80V. The LTC4440A-5 can
also withstand and continue to function during 100V VIN
transients. The powerful driver capability reduces switching 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.
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Wide Operating VIN Range: Up to 80V
Rugged Architecture Tolerant of 100V VIN 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
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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.
Automotive Power Systems
Telecommunications Power Systems
Distributed Power Architectures
Server Power Supplies
High Density Power Modules
General Purpose Low or High Side Driver
The LTC4440A-5 is available in the thermally enhanced
8-lead MSOP package.
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.
PARAMETER
Max Operating TS
Absolute Max TS
MOSFET Gate Drive
VCC UV+
VCC 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
Typical Application
Synchronous Phase-Modulated Full-Bridge Converter
LTC4440A-5 Driving a 1000pF Capacitive Load
VIN
36V TO 80V
VCC
4V TO 15V
LTC4440A-5
VCC BOOST
INP
TG
GND
TS
TG-TS
2V/DIV
LTC4440A-5
LTC3722-1
VCC BOOST
INP
TG
GND
TS
•
•
INP
2V/DIV
4440A5 TA01
50ns/DIV
4440A5 TA02
VCC = BOOST-TS = 5V
4440a5f
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1
LTC4440A-5
Absolute Maximum Ratings
(Note 1)
Pin Configuration
Supply Voltage
VCC ........................................................ –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
TOP VIEW
INP
GND
VCC
GND
1
2
3
4
9
GND
8
7
6
5
TS
TG
BOOST
NC
MS8E PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 40°C/W (NOTE 4)
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4440AIMS8E-5#PBF
LTC4440AIMS8E-5#TRPBF
LTGKP
8-Lead Plastic MSOP
–40°C to 125°C
LTC4440AHMS8E-5#PBF
LTC4440AHMS8E-5#TRPBF
LTGKP
8-Lead Plastic MSOP
–40°C to 150°C
LTC4440AMPMS8E-5#PBF LTC4440AMPMS8E-5#TRPBF LTGKP
8-Lead Plastic MSOP
–55°C to 150°C
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
The
● denotes specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VCC = VBOOST = 6V, VTS = GND = 0V, unless otherwise noted.
(Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
200
18
325
40
µA
µA
3.20
3.04
160
3.65
3.50
V
V
mV
Main Supply (VCC)
IVCC
DC Supply Current
Normal Operation
UVLO
UVLO
Undervoltage Lockout Threshold
INP = 0V
VCC < UVLO Threshold (Falling) – 0.1V
VCC Rising
VCC Falling
Hysteresis
l
l
2.75
2.60
Bootstrapped Supply (BOOST – TS)
IBOOST
DC Supply Current
Normal Operation
INP = 0V
INP = 6V
0
310
450
µA
µA
4440a5f
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LTC4440A-5
Electrical
Characteristics
The
● denotes specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VCC = VBOOST = 6V, VTS = GND = 0V, unless otherwise noted.
(Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Signal (INP)
VIH
High Input Threshold
INP Ramping High
l
1.2
1.55
2
V
VIL
Low Input Threshold
INP Ramping Low
l
0.8
1.25
1.6
V
VIH – VIL
Input Voltage Hysteresis
0.350
IINP
Input Pin Bias Current
±0.01
±2
µA
V
Output Gate Driver (TG)
VOH
High Output Voltage
ITG = –10mA, VOH = VBOOST – VTG
VOL
Low Output Voltage
ITG = 100mA
0.7
IPU
Peak Pull-Up Current
l
RDS
Output Pull-Down Resistance
l
185
l
0.7
V
400
1.1
1.85
mV
A
4
Ω
Switching Timing
tr
Output Rise Time
10% – 90%, CL = 1nF
10% – 90%, CL = 10nF
10
100
ns
ns
tf
Output Fall Time
10% – 90%, CL = 1nF
10% – 90%, CL = 10nF
7
70
ns
ns
tPLH
Output Low-High Propagation Delay
l
35
80
ns
tPHL
Output High-Low Propagation Delay
l
33
80
ns
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 TJ ≈ TA. 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: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • θJA°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.
4440a5f
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3
LTC4440A-5
Typical Performance Characteristics
BOOST-TS Supply Quiescent
Current vs Voltage
400
300
350
250
INP = GND
200
INP = VCC
150
100
50
300
INP = VCC
300
250
200
150
100
50
10
5
VCC SUPPLY VOLTAGE (V)
0
0
15
5
0
10
1.8
3
4
5 6 7 8 9 10 11 12 13 14 15
BOOST-TS SUPPLY VOLTAGE (V)
4440A5 G03
2MHz Operation
12
ITG = 1mA
10
ITG = 10mA
ITG = 100mA
8
6
4
INPUT
(INP)
5V/DIV
VIH
1.6
INPUT THRESHOLD (V)
HIGH OUTPUT VOLTAGE (V)
50
2.0
14
1.4
VIL
1.2
1.0
OUTPUT
(TG)
5V/DIV
0.8
0.6
0.4
2
250ns/DIV
VCC = BOOST-TS = 12V
0.2
4
5
0
6 7 8 9 10 11 12 13 14 15
BOOST-TS SUPPLY VOLTAGE (V)
4
5
6
4440A5 G05
VCC Supply Current
vs Temperature
VCC Undervoltage Lockout
Thresholds vs Temperature
BOOST-TS Quiescent Current
vs Temperature
3.5
250
400
3.4
UVLO THRESHOLD VOLTAGE (V)
INP = GND
INP = VCC
100
50
3.3
3.2
3.1
350
RISING
FALLING
3.0
2.9
2.8
2.7
4440A5 G07
300
250
200
150
100
50
2.6
0
–55 –35 –15 5 25 45 65 85 105 125 155
TEMPERATURE (°C)
4440A5 G06
7 8 9 10 11 12 13 14 15
VCC SUPPLY VOLTAGE (V)
4440A5 G04
QUIESCENT CURRENT (µA)
100
Input (INP) Thresholds
vs Supply Voltage
16
150
150
4440A5 G02
Output High Voltage (VOH)
vs Supply Voltage
200
200
BOOST-TS SUPPLY VOLTAGE (V)
4440A5 G01
0
250
0
15
QUIESCENT CURRENT (µA)
0
Output Low Voltage (VOL)
vs Supply Voltage
OUTPUT (TG-TS) VOLTAGE (mV)
350
QUIESCENT CURRENT (µA)
QUIESCENT CURRENT (µA)
VCC Supply Quiescent Current
vs Voltage
2.5
–55 –35 –15 5 25 45 65 85 105 125 155
TEMPERATURE (°C)
4440A5 G08
0
–55 –35 –15 5 25 45 65 85 105 125 155
TEMPERATURE (°C)
4440A5 G09
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LTC4440A-5
Typical Performance Characteristics
Input (INP) Threshold
vs Temperature
HYSTERESIS (VIH-VIL) (mV)
VIH
1.4
VIL
1.2
1.0
3.5
370
3.0
BOOST-TS = 15V
360
350
340
330
320
Output Driver Pull-Down
Resistance vs Temperature
BOOST-TS = 6V
1.0
BOOST-TS = 4V
0
–55 –35 –15 5 25 45 65 85 105 125 155
TEMPERATURE (°C)
4440A5 G12
Propagation Delay vs Temperature
3.0
50
BOOST-TS = 4V
VCC = BOOST = 6V
45
BOOST-TS = 6V
BOOST-TS = 15V
BOOST-TS = 12V
1.0
0.5
PROPAGATION DELAY (ns)
1.5
1.5
4440A5 G11
4440A5 G10
2.0
BOOST-TS = 12V
2.0
300
–55 –35 –15 5 25 45 65 85 105 125 155
TEMPERATURE (°C)
0.8
–55 –35 –15 5 25 45 65 85 105 125 155
TEMPERATURE (°C)
2.5
2.5
0.5
310
RDS (Ω)
INPUT THRESHOLD (V)
1.8
380
PEAK CURRENT (A)
2.0
1.6
Peak Driver (TG) Pull-Up Current
vs Temperature
Input Threshold Hysteresis
vs Temperature
40
tPLH
35
tPHL
30
25
0
–55 –35 –15 5 25 45 65 85 105 125 155
TEMPERATURE (°C)
20
–55 –35 –15 5 25 45 65 85 105 125 155
TEMPERATURE (°C)
4440A5 G13
4440A5 G14
Driving a 3300pF Capacitive Load
Driving a 3300pF Capacitive Load
TG-TS
2V/DIV
TG-TS
5V/DIV
INP
2V/DIV
INP
2V/DIV
50ns/DIV
VCC = BOOST-TS = 5V
4440A5 G15
50ns/DIV
VCC = BOOST-TS = 12V
4440A5 G16
4440a5f
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5
LTC4440A-5
Pin Functions
INP (Pin 1): Input Signal. TTL/CMOS compatible input
referenced to GND (Pin 2).
GND (Pins 2, 4, Exposed Pad Pin 9): Ground. The exposed
pad must be electrically connected to Pins 2 and 4 and
soldered to PCB ground for rated thermal performance.
VCC (Pin 3): 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).
NC (Pin 5): No Connect. No connection required. For
convenience, this pin may be tied to Pin 6 (BOOST) on
the application board.
BOOST (Pin 6): High Side Bootstrapped Supply. An external
capacitor should be tied between this pin and TS (Pin 8).
Normally, a bootstrap diode is connected between VCC
(Pin 3) and this pin. Voltage swing at this pin is from VCC
– VD to VIN + VCC – VD, where VD is the forward voltage
drop of the bootstrap diode.
TG (Pin 7): High Current Gate Driver Output (Top Gate).
This pin swings between TS and BOOST.
TS (Pin 8): Top (High Side) source connection or GND if
used in ground referenced applications.
Block Diagram
VIN
UP TO 80V,
TRANSIENT
UP TO 100V
BOOST
VCC UNDERVOLTAGE
LOCKOUT
TG
GND
TS
4V TO 15V
BOOST
INP
LEVEL SHIFTER
GND
4440A5 BD
TS
Timing Diagram
INPUT RISE/FALL TIME < 10ns
INPUT (INP)
VIH
VIL
90%
10%
OUTPUT (TG)
tr
tPLH
tPHL
tf
4440A5 TD
4440a5f
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LTC4440A-5
Applications Information
Overview
VIN
UP TO 100V
BOOST
The LTC4440A-5 receives a ground-referenced, low voltage
digital input signal to drive a high side N-channel power
MOSFET whose drain can float up to 80V above ground,
eliminating the need for a transformer between the low
voltage control signal and the high side gate driver. The
LTC4440A-5 normally operates in applications with input
supply voltages (VIN) up to 80V, but is able to withstand
and continue to function during 100V, 100ms transients
on the input supply.
The powerful output driver of the LTC4440A-5 reduces the
switching losses of the power MOSFET, which increase
with transition time. The LTC4440A-5 is capable of driving a 1nF load with 10ns rise and 7ns fall times using a
bootstrapped supply voltage VBOOST–TS of 6V.
Input Stage
The LTC4440A-5 employs TTL/CMOS compatible input
logic level or thresholds that allow a low voltage digital
signal to drive standard threshold power MOSFETs. The
LTC4440A-5 contains an internal voltage regulator that
biases the input buffer, allowing the input thresholds
(VIH = 1.6V, VIL = 1.25V) to be relatively independent of
variations in VCC. The 350mV hysteresis between VIH and
VIL eliminates false triggering due to noise during switching
transitions. However, care should be taken to keep this pin
from any noise pickup, especially in high frequency, high
voltage applications. The LTC4440A-5 input buffer has a
high input impedance and draws negligible input current,
simplifying the drive circuitry required for the input.
Output Stage
A simplified version of the LTC4440A-5’s output stage is
shown in Figure 1. The pull-down device is an N-channel
MOSFET (N1) and the pull-up device is an NPN bipolar
junction transistor (Q1). The output swings from the lower
rail (TS) to within an NPN VBE (~0.7V) of the positive rail
(BOOST). This large voltage swing is important in driving external power MOSFETs, whose RDS(ON) is inversely
proportional to its gate overdrive voltage (VGS – VTH).
The LTC4440A-5’s peak pull-up (Q1) current is 1.1A while
the pull-down (N1) resistance is 1.85Ω, with a BOOSTTS supply of 6V. The low impedance of N1 is required to
LTC4440A-5
CGD
Q1
TG
POWER
MOSFET
N1
CGS
TS
LOAD
INDUCTOR
4440A5 F01
V–
Figure 1. Capacitance Seen by TG During Switching
discharge the power MOSFET’s gate capacitance during
high-to-low signal transitions. When the power MOSFET’s
gate is pulled low (gate shorted to source through N1) by
the LTC4440A-5, its source (TS) is pulled low by its load
(e.g., an inductor or resistor). The slew rate of the source/
gate voltage causes current to flow back to the MOSFET’s
gate through the gate-to-drain capacitance (CGD). If the
MOSFET driver does not have sufficient sink current capability (low output impedance), the current through the
power MOSFET’s CGD can momentarily pull the gate high,
turning the MOSFET back on.
A similar scenario exists when the LTC4440A-5 is used
to drive a low side MOSFET. When the low side power
MOSFET’s gate is pulled low by the LTC4440A-5, its drain
voltage is pulled high by its load (e.g., inductor or resistor). The slew rate of the drain voltage causes current to
flow back to the MOSFET’s gate through its gate-to-drain
capacitance. If the MOSFET driver does not have sufficient
sink current capability (low output impedance), the current
through the power MOSFET’s CGD can momentarily pull
the gate high, turning the MOSFET back on.
Rise/Fall Time
Since the power MOSFET generally accounts for the majority of the power loss in a converter, it is important to
quickly turn it on or off, thereby minimizing the transition
time in its linear region. The LTC4440A-5 can drive a 1nF
load with a 10ns rise time and 7ns fall time.
The LTC4440A-5’s rise and fall times are determined by
the peak current capabilities of Q1 and N1. The predriver
that drives Q1 and N1 uses a nonoverlapping transition
scheme to minimize cross-conduction currents. N1 is fully
turned off before Q1 is turned on and vice versa.
4440a5f
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7
LTC4440A-5
Applications Information
Power Dissipation
To ensure proper operation and long-term reliability,
the LTC4440A-5 must not operate beyond its maximum
temperature rating. Package junction temperature can be
calculated by:
nodal capacitances and cross-conduction currents in the
internal gates.
Undervoltage Lockout (UVLO)
where:
The LTC4440A-5 contains an undervoltage lockout detector that monitors VCC. When VCC falls below 3.04V, the
internal buffer is disabled and the output pin TG is pulled
down to TS.
TJ = Junction Temperature
Bypassing and Grounding
TJ = TA + PD (θJA)
TA = Ambient Temperature
PD = Power Dissipation
θJA = Junction-to-Ambient Thermal Resistance
Power dissipation consists of standby and switching
power losses:
PD = PSTDBY + PAC
The LTC4440A-5 requires proper bypassing on the VCC
and VBOOST–TS supplies due to its high speed switching
(nanoseconds) and large AC currents (Amperes). Careless
component placement and PCB trace routing may cause
excessive ringing and under/overshoot.
To obtain the optimum performance from the LTC4440A-5:
A. Mount the bypass capacitors as close as possible
between the VCC and GND pins and the BOOST and
TS pins. The leads should be shortened as much as
possible to reduce lead inductance.
where:
PSTDBY = Standby Power Losses
PAC = AC Switching Losses
The LTC4440A-5 consumes very little current during
standby. The DC power loss at VCC = 6V and VBOOST–TS =
6V is only (200µA)(6V) = 1.2mW with INP = 0V.
AC switching losses are made up of the output capacitive
load losses and the transition state losses. The capacitive
load losses are primarily due to the large AC currents
needed to charge and discharge the load capacitance during switching. Load losses for the output driver driving a
pure capacitive load COUT would be:
Load Capacitive Power = (COUT)(f)(VBOOST–TS)2
The power MOSFET’s gate capacitance seen by the driver
output varies with its VGS voltage level during switching.
A power MOSFET’s capacitive load power dissipation can
be calculated using its gate charge, QG. The QG value
corresponding to the MOSFET’s VGS value (VCC in this
case) can be readily obtained from the manufacturer’s
QG vs VGS curves:
Load Capacitive Power (MOS) = (VBOOST–TS)(QG)(f)
B. Use a low inductance, low impedance ground plane
to reduce any ground drop and stray capacitance.
Remember that the LTC4440A-5 switches >2A peak
currents and any significant ground drop will degrade
signal integrity.
C. Plan the power/ground routing carefully. Know where
the large load switching current is coming from and
going to. Maintain separate ground return paths for
the input pin and the output power stage.
D. Keep the copper trace between the driver output pin
and the load short and wide.
E. When using the MS8E package, be sure to solder the
exposed pad on the back side of the LTC4440A-5 package to the board. Correctly soldered to a 2500mm2
double-sided 1oz copper board, the LTC4440A-5 has
a thermal resistance of approximately 40°C/W. Failure
to make good thermal contact between the exposed
back side and the copper board will result in thermal
resistances far greater than 40°C/W.
Transition state power losses are due to both AC currents
required to charge and discharge the driver’s internal
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A
1
4
2
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1µF
220pF
150Ω
20k
1/4W
12V
UVLO
VREF
VIN
SBUS
9
0.47µF
ADLY PDLY
11
Q3
Q1
12V
220pF
8
180pF
5.1k
1
DPRG NC SYNC
220pF
2
14
5VREF 150k
12
18
10
4.99k
20k
B
8 0.22µF
21
20
C
33k
10k
13
5
6
23
17
10Ω
68nF
8.25k
22
MMBT3904
CT SPRG RLEB FB GND PGND
24
19
D
D
15
C3
68µF
20V
Q4
Q2
12V
8 0.22µF
16
+
12V
7
D11
3
5VREF
750Ω
200k
ISNS
D4
2.2nF
6
8
2
4
2
4
D8
D7
330Ω
5
C4
2.2nF
250V
8
MOC207
5
9
100k
2
1
VH
D12
5.1V
1
3
11
CSF–
12
8
3
4
2.7k
470Ω
1/4W
6
5
GND-F GND-S
8
10
+
VOUT
4440A5 TA03
16
PVCC
22nF
10k
330pF
7
TIMER
–VOUT
2.49k
9.53k
13
14 15
MF MF2 VCC
909Ω
D1
820pF
200V
15Ω
1W
D6
Si7852DP
×4
C1, C2
180µF
16V
×2
VH
GND PGND GND2 PGND2
LTC3901EGN
ME ME2 CSF+
2
1.10k
4.87k
1/4W
V+
LT1431CS8
COLL
REF
0.047µF
5
CSE–
6
L3
0.85µH
Si7852DP
×4
909Ω
CSE+
1.10k
4.87k
1/4W
SYNC
220pF
100Ω
1
6
7
8
10
11
7
8
10
11
T1
5(105µH):1:1
T2
5:5(105µH):1:1
D5
T3
1(1.5mH):0.5
1
4
L4
1mH
0.1µF
D9 3.3V
100Ω
Si7852DP
×2
Si7852DP
×2
22Ω
330pF
4
SS COMP
CS
OUTA OUTB OUTC OUTD OUTF OUTE
A
B
2
ISNS
10Ω
4
1.1k
0.02Ω
1.5W
LTC3722EGN-1
0.02Ω
1.5W
Si7852DP
×2
L2
150nH
Si7852DP
×2
51Ω
2W
0.47µF
0.47µF 100V
100V
•
VIN
1
VCC
6
INP
BOOST
LTC4440A-5
7
TG
GND GND TS
C
D3
VCC
6
INP
BOOST
LTC4440A-5
7
TG
GND GND TS
D2
12V
3
12V
3
1µF
100V
×4
0.47µF, 100V TDK C3216X7R2A474M
1µF, 100V TDK C4532X7R2A105M
C1, C2: SANYO 16SP180M
C3: AVX TPSE686M020R0150
C4: MURATA DE2E3KH222MB3B
D1, D4-D6: MURS120T3
D2, D3, D7, D8: BAS21
D9: MMBZ5226B
D10: MMBZ5240B
D11: BAT54
D12: MMBZ231B
L1: SUMIDA CDEP105-1R3MC-50
L2: PULSE PA0651
L3: PA1294.910
L4: COILCRAFT DO1608C-105
Q1, Q2: ZETEX FMMT619
Q3, Q4: ZETEX FMMT718
T1, T2: PULSE PA0526
T3: PULSE PA0785
1µF
100V
•
30.1k
182k
–VIN
36V TO 60V
51Ω
2W
•
VIN
•
•
•
•
•
•
•
VIN
•
L1
1.3µH
LTC3722/LTC4440A-5 420W 36V-60VIN to 12V/35A Isolated Full-Bridge Supply
1
–VOUT
1µF
39.2k
–VOUT
1µF
VOUT
0.47µF
100V
13k
1/2W
VOUT
1µF
D10
10V
MMBT3904
100Ω
–VOUT
12V/35A
VOUT
–VOUT
VOUT
1k
LTC4440A-5
Typical Applications
4440a5f
9
VIN
93
94
95
96
97
–VIN
6
8
For more information www.linear.com/LTC4440A-5
66.5k
1.5nF
1µF
15
5
13 7
8
UVLO
FB GND CT
10k
270pF 33k
16
12 14
68nF
0.47µF
1
VREF
9
150k
SPRG RLEB SS DPRG
SDRB
VCC
DRVB
ISNS
DRVA
LTC3723EGN-1
R2
0.03Ω
1.5W
1.5k
2
B
R1
0.03Ω
1.5W
Si7852DP
4
4
A
2
B
243k
330pF
11
22nF
6
6
1
5
T2
1(1.5mH):0.5
1
4
D6
D5
Si7852DP
3
4
2
8
5
C4
2.2nF
250V
8
MOC207
665Ω
5
9
22nF
D8
10V
1
0.1µF
14 15
6
CSE+
L6
1.25µH
CSE–
5
8
3
+
4
1k
100Ω
1/4W
6
5
GND-F GND-S
8
10
VOUT
4440A5 TA05
–VOUT
2.49k
9.53k
13
2
+
VE
VF
3
16
C1, C2
47µF
16V
×2
22nF
10k
1
–VOUT
1µF
4.7µF
MMBT3904
D7
10V
1k
1µF, 100V TDK C3225X7R2A105M
C1, C2: SANYO 16TQC47M
C3: AVX TPSE686M020R0150
C4: MURATA GHM3045X7R222K-GC
D2: DIODES INC. ES1B
D3-D6: BAS21
D7, D8: MMBZ5240B
L4: COILCRAFT DO1608C-105
L5: COILCRAFT DO1813P-561HC
L6: PULSE PA1294.132 OR
PANASONIC ETQP1H1R0BFA
R1, R2: IRC LRC2512-R03G
T1: PULSE PA0805.004
T2: PULSE PA0785
470pF
7
TIMER
PVCC
VOUT
–VOUT
12V/20A
VOUT
42.2k 100Ω
–VOUT
1µF
VOUT
470pF
100V
10Ω
1W
ME ME2 VCC
866Ω
GND PGND GND2 PGND2
LTC3901EGN
MF MF2
1k
6.19k
1/4W
V
LT1431CS8
COLL
REF
12
CSF –
11
CSF+
1k
6.19k
1/4W
SYNC
220pF
100Ω
100k
2
1
866Ω
1k
1/4W
VE
1µF
100V
D2
VF
VF
Si7370DP
×2
7
VE
Si7370DP
×2
11
9
T1
4T:6T(65µHMIN):6T:2T:2T
Si7852DP
0.1µF
L4
1mH
ISNS
22Ω
10
+
12V
750Ω
COMP
CS
SDRA
3
C3
68µF
20V
0.1µF
VCC
6
INP BOOST
LTC4440A-5
5 4.7Ω
TG
GND TS
6
A
0.1µF
20
200Ω
1/4W
4
3
D3
•
30k
1/4W
12V
2
Si7852DP
A
1
12V
•
464k
D4
VCC
6
INP BOOST
LTC4440A-5
5 4.7Ω
TG
GND TS
VIN
3
1
12V
18
56VIN
48VIN
42VIN
B
1µF
100V
×3
VIN
16
10
12
14
LOAD CURRENT (A)
1µF
100V
L5
0.56µH
•
•
42V TO 56V
EFFICIENCY (%)
•
•
•
10
•
LTC3723-1 240W 42-56VIN to 12V/20A Isolated 1/4Brick (2.3" × 1.45")
LTC4440A-5
Typical Applications
4440a5f
LTC4440A-5
Package Description
MS8E Package
8-Lead Plastic MSOP, Exposed Die Pad
(Reference LTC DWG # 05-08-1662 Rev J)
BOTTOM VIEW OF
EXPOSED PAD OPTION
1.88
(.074)
1
1.88 ±0.102
(.074 ±.004)
0.29
REF
1.68
(.066)
0.889 ±0.127
(.035 ±.005)
0.05 REF
5.23
(.206)
MIN
DETAIL “B”
CORNER TAIL IS PART OF
DETAIL “B” THE LEADFRAME FEATURE.
FOR REFERENCE ONLY
NO MEASUREMENT PURPOSE
1.68 ±0.102 3.20 – 3.45
(.066 ±.004) (.126 – .136)
8
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
0.65
(.0256)
BSC
0.42 ±0.038
(.0165 ±.0015)
TYP
8
7 6 5
0.52
(.0205)
REF
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
DETAIL “A”
1
2 3
4
1.10
(.043)
MAX
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
NOTE:
BSC
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD
SHALL NOT EXCEED 0.254mm (.010") PER SIDE.
0.1016 ±0.0508
(.004 ±.002)
MSOP (MS8E) 0911 REV J
4440a5f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection
of itsinformation
circuits as described
herein will not infringe on existing patent rights.
For more
www.linear.com/LTC4440A-5
11
LTC4440A-5
Typical Application
240W 42V-56VIN to Unregulated 12V Half-Bridge Converter
L1
0.56µH
•
•
1µF
100V
11V
1µF
100V
D1
1µF
100V
1
A
VCC
6
INP BOOST
LTC4440A-5
5
TG
GND TS
3
2
1µF
100V
Si7852DP
×2
T2
70(980µH):1
4
CS+
1
3
1µF
100V
8
4 0.22µF
Si7852DP
×2
VIN
12V
MMBT3904
120Ω
15
DRVA
DRVB
VCC
LTC3723EGN-2
COMP
VREF RAMP CT SPRG GND CS SS
12
1µF
1µF
30.1k
SDRA
UVLO
DPRG
100pF
•
6
SDRB
62k
330pF
9
1
8
150pF
16
7
22Ω
0.1µF
0.47µF
14 15
6
3k
5
CSE+
2N7002
4.7k
2
LTC3901EGN
SYNC
4
D4
D5
7.5Ω
7.5Ω
16
PVCC
GND PGND GND2 PGND2
8
3
CSE– ME ME2 VCC
10
13
33.2k
1µF, 100V TDK C4532X7R2A105M
C1: MURATA DE2E3KH222MB3B
C2: SANYO 16SP180M
C3: AVX TPSE686M020R0150
D1-D3: BAS21
D4, D5: MMBD914
100Ω
TIMER
7
VOUT
MMBT3904
1
330pF
CS+
1k
10k
470pF
12
10k
CSF – MF MF2
220pF
0.22µF B
10 14 13
0.47µF
3k
100Ω
5
8
11
FB
CSF+
–VOUT
4.7k
1/4W
10k
9
–VOUT
VE
11
T3
1(1.5mH):0.5
1
4
2
3
C2
180µF
16V
Si7370DP
×2
4.7k
1/4W
•
5
215k
4
+
20Ω 1W
VF
T1
5:4:4:2:2
D3
A
6
C1
2.2nF
250V
•
15k
1/4W
11V
VOUT
1500pF
100V
Si7370DP
×2
5
1
L3
1mH
68µF
11
D2
12V
+
C3
VOUT
L2 0.22µH
VF
1µF
7
3
B
7
9
•
–VIN
VE
2
•
1µF
100V
48VIN
VIN
•
•
VIN
1k
1µF
1µF
–VOUT
L1: COILCRAFT DO1813P-561HC
L2: SUMIDA CDEP105-0R2NC-50
L3: COILCRAFT DO1608C-105
T1: PULSE PA0801.005
T2: PULSE P8207
T3: PULSE PA0785
10V
MMBZ5240B
4440A5 TA04
12V
MMBZ5242B
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LTC4444/LTC4444-5
High Voltage Synchronous N-Channel MOSFET Driver with
Shoot-Through Protection
Up to 100V Supply Voltage, 7.2V ≤ VCC ≤ 13.5V, 3A Peak
Pull-Up/0.55Ω Peak Pull-Down
LTC4446
High Voltage Synchronous N-Channel MOSFET Driver
without Shoot-Through Protection
Up to 100V Supply Voltage, 7.2V ≤ VCC ≤ 13.5V, 3A Peak
Pull-Up/0.55Ω Peak Pull-Down
LTC4441/LTC4441-1
N-Channel MOSFET Gate Driver
Up to 25V Supply Voltage, 5V ≤ VCC ≤ 25V, 6A Peak Output Current
LTC3900
Synchronous Rectifier Driver for Forward Converters
Programmable Time Out, Reverse Inductor Current Sense
LTC3901
Synchronous Rectifier Driver for Push-Pull and Full-Bridge
Converters
Programmable Time Out, Reverse Inductor Current Sense
LTC3722-1/LTC3722-2 Synchronous Dual Mode Phase Modulated Full-Bridge
Controllers
Adaptive Zero Voltage Switching, High Output Power Levels (Up to
Kilowatts)
LTC3723-1/LTC3723-2 Synchronous Push-Pull PWM Controllers
Current Mode or Voltage Mode Controllers
LTC3765/LTC3766
Isolated Synchronous Forward Controller Chip Set
Active Clamp Reset, Direct Flux Limit™ with Onboard Gate Drivers
Ideal for Medium Power 24V and 48V Input Applications
LT1952/LT1952-1
Synchronous Forward Active Clamp Controllers
Ideal for Medium Power 24V and 48V Input Applications
4440a5f
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
For more information www.linear.com/LTC4440A-5
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com/LTC4440A-5
LT 0913 • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2013