LTC4440-5
High Speed, High Voltage,
High Side Gate Driver
Features
Description
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The LTC®4440-5 is a high frequency high side N-channel
MOSFET gate driver that is designed to operate in applications with VIN voltages up to 60V. The LTC4440-5 can
also withstand and continue to function during 80V VIN
transients. The powerful driver capability reduces switching losses in MOSFETs with high gate capacitances. The
LTC4440-5’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 60V
Rugged Architecture Tolerant of 80V 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
Low Profile (1mm) SOT-23 (ThinSOT™) and
Thermally Enhanced 8-Pin MSOP Packages
The LTC4440-5 is optimized for driving (5V) logic level
FETs and contains an undervoltage lockout circuit that
disables the external MOSFET when activated.
Applications
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The LTC4440-5 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.
Telecommunications Power Systems
Distributed Power Architectures
Server Power Supplies
High Density Power Modules
General Purpose Low-Side Driver
The LTC4440-5 is available in the low profile (1mm)
SOT-23 or a thermally enhanced 8-lead MSOP package.
PARAMETER
L, LT, LTC, LTM, Linear Technology, the Linear logo and PolyPhase 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.
Max Operating TS
Absolute Max TS
MOSFET Gate Drive
LTC4440-5
LTC4440A-5
LTC4440
60V
80V
80V
80V
100V
100V
4V to 15V
4V to 15V
8V to 15V
VCC UV+
3.2V
3.2V
6.3V
VCC UV–
3.04V
3.04V
6.0V
Typical Application
Synchronous Phase-Modulated Full-Bridge Converter
LTC4440-5 Driving a 1000pF Capacitive Load
VIN
36V TO 60V
VCC
4V TO 15V
LTC4440-5
TG-TS
2V/DIV
VCC BOOST
INP
TG
GND
TS
INP
2V/DIV
LTC4440-5
LTC3722-1
VCC BOOST
INP
TG
GND
TS
•
•
50ns/DIV
4440-5 TA02
VCC = BOOST-TS = 5V
4440 TA01
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1
LTC4440-5
Absolute Maximum Ratings
(Note 1)
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 85V
BOOST Voltage (100ms)............................. –0.3V to 95V
TS Voltage (Continuous)................................ –5V to 70V
TS Voltage (100ms)....................................... –5V to 80V
Peak Output Current < 1µs (TG)...................................4A
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
VCC
GND
1
2
3
4
9
TOP VIEW
8
7
6
5
TS
TG
BOOST
NC
VCC 1
MS8E PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
6 BOOST
GND 2
5 TG
INP 3
4 TS
S6 PACKAGE
6-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 230°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4440EMS8E-5#PBF
LTC4440EMS8E-5#TRPBF LTBRG
PART MARKING
8-Lead Plastic MSOP
–40°C to 85°C
LTC4440ES6-5#PBF
LTC4440ES6-5#TRPBF
6-Lead Plastic SOT-23
–40°C to 85°C
LTBRF
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
The
● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = VBOOST = 6V, VTS = GND = 0V, unless otherwise noted.
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
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LTC4440-5
Electrical
Characteristics
The
● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = VBOOST = 6V, VTS = GND = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
1.6
2
1.25
1.6
UNITS
Input Signal (INP)
VIH
High Input Threshold
INP Ramping High
l
1.2
VIL
Low Input Threshold
INP Ramping Low
l
0.8
VIH – VIL
Input Voltage Hysteresis
0.350
IINP
Input Pin Bias Current
±0.01
V
V
V
±2
µA
Output Gate Driver (TG)
VOH
High Output Voltage
ITG = –10mA, VOH = VBOOST – VTG
ITG = 100mA
0.7
VOL
Low Output Voltage
IPU
Peak Pull-Up Current
l
RDS
Output Pull-Down Resistance
l
185
l
0.75
V
275
mV
1.1
1.85
A
2.75
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
65
ns
tPHL
Output High-Low Propagation Delay
l
33
65
ns
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC4440-5 is guaranteed to meet performance specifications
from 0°C to 85°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: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • θJA°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
BOOST-TS Supply Quiescent
Current vs Voltage
400
300
350
250
INP = GND
200
INP = VCC
150
100
50
0
Output Low Voltage (VOL)
vs Supply Voltage
300
INP = VCC
OUTPUT (TG-TS) VOLTAGE (mV)
350
QUIESCENT CURRENT (µA)
QUIESCENT CURRENT (µA)
VCC Supply Quiescent Current
vs Voltage
300
250
200
150
100
50
0
10
5
VCC SUPPLY VOLTAGE (V)
15
0
0
5
10
15
BOOST-TS SUPPLY VOLTAGE (V)
4440-5 G01
4440-5 G02
250
200
150
100
50
0
3
4
5 6 7 8 9 10 11 12 13 14 15
BOOST-TS SUPPLY VOLTAGE (V)
4440-5 G03
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3
LTC4440-5
Typical Performance Characteristics
Output High Voltage (VOH)
vs Supply Voltage
Input (INP) Thresholds
vs Supply Voltage
1.8
12
ITG = 1mA
10
ITG = 10mA
ITG = 100mA
8
6
4
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
4440-5 G05
VCC Supply Current
vs Temperature
VCC Undervoltage Lockout
Thresholds vs Temperature
BOOST-TS Quiescent Current
vs Temperature
3.5
250
100
50
350
3.3
QUIESCENT CURRENT (µA)
UVLO THRESHOLD VOLTAGE (V)
INP = VCC
150
400
3.4
INP = GND
200
RISING
3.2
3.1
FALLING
3.0
2.9
2.8
2.7
2.5
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
150
100
Peak Driver (TG) Pull-Up Current
vs Temperature
1.4
VIL
1.2
1.0
380
3.5
370
3.0
360
PEAK CURRENT (A)
HYSTERESIS (VIH-VIL) (mV)
1.8
VIH
350
340
330
320
4440-5 G11
300
–55 –35 –15
BOOST-TS = 15V
2.5
2.0
BOOST-TS = 12V
1.5
5 25 45 65 85 105 125
TEMPERATURE (°C)
4440-5 G12
BOOST-TS = 6V
1.0
0.5
310
5 25 45 65 85 105 125
TEMPERATURE (°C)
5 25 45 65 85 105 125
TEMPERATURE (°C)
4440-5 G10
Input Threshold Hysteresis
vs Temperature
2.0
INPUT THRESHOLD (V)
200
4440-5 G09
Input (INP) Threshold
vs Temperature
0.8
–55 –35 –15
250
0
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
4440-5 G08
1.6
300
50
2.6
0
–55 –35 –15
4440-5 G07
7 8 9 10 11 12 13 14 15
VCC SUPPLY VOLTAGE (V)
4440-5 G04
QUIESCENT CURRENT (µA)
INPUT
(INP)
5V/DIV
VIH
1.6
INPUT THRESHOLD (V)
HIGH OUTPUT VOLTAGE (V)
14
0
2MHz Operation
2.0
16
0
–55 –35 –15
BOOST-TS = 4V
5 25 45 65 85 105 125
TEMPERATURE (°C)
4440-5 G13
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LTC4440-5
Typical Performance Characteristics
Output Driver Pull-Down
Resistance vs Temperature
2.5
45
BOOST-TS = 4V
BOOST-TS = 6V
1.5
BOOST-TS = 15V
BOOST-TS = 12V
1.0
0.5
PROPAGATION DELAY (ns)
50
2.0
RDS (Ω)
Propagation Delay vs Temperature
3.0
VCC = BOOST = 6V
40
tPLH
35
tPHL
30
25
0
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
20
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
4440-5 G14
4440-5 G15
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
4440-5 G16
50ns/DIV
VCC = BOOST-TS = 12V
4440-5 G17
Pin Functions
SOT-23 Package
VCC (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 or GND if
used in ground referenced applications.
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
VCC (Pin 1) 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.
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5
LTC4440-5
Pin Functions
Exposed Pad MS8E Package
INP (Pin 1): Input Signal. TTL/CMOS compatible input
referenced to GND (Pin 2).
GND (Pins 2, 4): Chip Ground.
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.
Exposed Pad (Pin 9): Ground. Must be electrically connected to Pins 2 and 4 and soldered to PCB ground for
optimum thermal performance.
Block Diagram
VIN
UP TO 60V,
TRANSIENT
UP TO 80V
BOOST
VCC UNDERVOLTAGE
LOCKOUT
TG
GND
TS
4V TO 15V
BOOST
INP
LEVEL SHIFTER
GND
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TS
Timing Diagram
INPUT RISE/FALL TIME < 10ns
INPUT (INP)
VIH
VIL
90%
10%
OUTPUT (TG)
tr
tPLH
tPHL
tf
4440 TD
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LTC4440-5
Applications Information
Overview
VIN
UP TO 100V
BOOST
The LTC4440-5 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
LTC4440-5 normally operates in applications with input
supply voltages (VIN) up to 60V, but is able to withstand
and continue to function during 80V, 100ms transients
on the input supply.
The powerful output driver of the LTC4440-5 reduces the
switching losses of the power MOSFET, which increase
with transition time. The LTC4440-5 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 LTC4440-5 employs TTL/CMOS compatible input logic
level or thresholds that allow a low voltage digital signal to
drive standard threshold power MOSFETs. The LTC4440-5
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 LTC4440-5 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 LTC4440-5’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 LTC4440-5’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
LTC4440-5
CGD
Q1
TG
POWER
MOSFET
N1
CGS
TS
LOAD
INDUCTOR
4440 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 LTC4440-5, 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 LTC4440-5 is used
to drive a low side MOSFET. When the low side power
MOSFET’s gate is pulled low by the LTC4440-5, 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 LTC4440-5 can drive a 1nF
load with a 10ns rise time and 7ns fall time.
The LTC4440-5’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.
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7
LTC4440-5
Applications Information
Power Dissipation
To ensure proper operation and long-term reliability,
the LTC4440-5 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 LTC4440-5 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 LTC4440-5 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 LTC4440-5:
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 LTC4440-5 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 LTC4440-5 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 LTC4440-5 package
to the board. Correctly soldered to a 2500mm2 doublesided 1oz copper board, the LTC4440-5 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
14 15
VOUT
16
PVCC
22nF
10k
330pF
7
TIMER
–VOUT
2.49k
9.53k
13
4440 TA03
8
10
+
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
LTC4440-5EMS8E
7
TG
GND GND TS
C
D3
VCC
6
INP
BOOST
LTC4440-5EMS8E
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/LTC4440-5 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
LTC4440-5
Typical Applications
44405fb
9
VIN
93
94
95
96
97
–VIN
6
8
For more information www.linear.com/LTC4440-5
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
4440 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
LTC4440-5ES6
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
LTC4440-5ES6
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")
LTC4440-5
Typical Applications
44405fb
LTC4440-5
Package Description
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
MS8E Package
8-Lead Plastic MSOP, Exposed Die Pad
(Reference LTC DWG # 05-08-1662 Rev K)
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
5.10
(.201)
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)
BSC
0.1016 ±0.0508
(.004 ±.002)
MSOP (MS8E) 0213 REV K
NOTE:
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.
44405fb
For more information www.linear.com//LTC4440-5
11
LTC4440-5
Package Description
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62
MAX
2.90 BSC
(NOTE 4)
0.95
REF
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC
S6 TSOT-23 0302
44405fb
12
For more information www.linear.com/LTC4440-5
LTC4440-5
Revision History
REV
DATE
DESCRIPTION
B
1013
Added comparison table
(Revision history begins at Rev B)
PAGE NUMBER
1
44405fb
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//LTC4440-5
13
LTC4440-5
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
LTC4440-5ES6
5
TG
GND TS
3
2
Si7852DP
×2
1µF
100V
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
1
62k
330pF
9
8
150pF
16
7
T3
1(1.5mH):0.5
1
4
2
3
22Ω
0.1µF
1k
0.47µF
4.7k
1/4W
3k
12
10k
14 15
CSF – MF MF2
6
3k
5
CSE+
2N7002
4.7k
2
4
D4
D5
7.5Ω
7.5Ω
16
PVCC
GND PGND GND2 PGND2
8
3
CSE– ME ME2 VCC
LTC3901EGN
SYNC
220pF
10 14 13
470pF
11
CSF+
–VOUT
10
33.2k
7
330pF
1µF, 100V TDK C4532X7R2A105M
C1: MURATA DE2E3KH222MB3B
C2: SANYO 16SP180M
C3: AVX TPSE686M020R0150
D1-D3: BAS21
D4, D5: MMBD914
100Ω
VOUT
MMBT3904
1
1k
TIMER
13
CS+
0.22µF B
FB
10k
9
–VOUT
VE
100Ω
5
8
11
10k
0.47µF
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
1µF
1µF
10V
MMBZ5240B
–VOUT
L1: COILCRAFT DO1813P-561HC
L2: SUMIDA CDEP105-0R2NC-50
L3: COILCRAFT DO1608C-105
T1: PULSE PA0801.005
T2: PULSE P8207
T3: PULSE PA0785
4440 TA04
12V
MMBZ5242B
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LT 1161
Quad Protected High Side MOSFET Driver
8V to 48V Supply Range, tON = 200µs, tOFF = 28µs
LTC1693 Family
High Speed Dual MOSFET Drivers
1.5A Peak Output Current, 4.5V ≤ VIN ≤ 13.2V
LT1952
Single Switch Synchronous Forward Controller
25W to 500W DC/DC Controller
®
LT3010/LT3010-5 50mA, 3V to 80V Low Dropout Micropower Regulators
Low Quiescent Current (30µA), Stable with Small (1µF) Ceramic Capacitor
LT3430
High Voltage, 3A, 200kHz Step-Down Switching Regulator Input Voltages Up to 60V, Internal 0.1Ω Power Switch, Current Mode
Architecture, 16-Pin Exposed Pad TSSOP Package
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 Push-Pull Controllers
LTC3900
Synchronous Rectifier Driver for Forward Converters
Programmable Time Out, Reverse Inductor Current Sense
LTC3901
Secondary Side Synchronous Driver for Push-Pull and
Full-Bridge Converters
Programmable Time Out, Reverse Inductor Current Sense
LTC4440
High Speed, High Voltage, High Side Gate Driver
High Side Source up to 100V, 8V to 15V Gate Drive Supply,
Undervoltage Lockout, 6-Lead ThinSOT or 8-Lead Exposed MSOP Package
LTC4441
6A MOSFET Driver
Adjustable Gate Drive from 5V to 8V, 5V ≤ VIN ≤ 28V
44405fb
14
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
For more information www.linear.com/LTC4440-5
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com/LTC4440-5
LT 1013 REV B • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2005
工商网监
湘ICP备2023018690号
