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LTC4440 High Speed, High Voltage High Side Gate Driver
FEATURES

DESCRIPTIO
Wide Operating VIN Range: Up to 80V Rugged Architecture Tolerant of 100V VIN Transients Powerful 1.5 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(R)4440 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 LTC4440 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 LTC4440's pull-up has a peak output current of 2.4A and its pull-down has an output impedance of 1.5. 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 undervoltage 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

Telecommunications Power Systems Distributed Power Architectures Server Power Supplies High Density Power Modules
TYPICAL APPLICATIO
VIN 36V TO 72V 100V PEAK TRANSIENT (ABS MAX) VCC 8V TO 15V
Synchronous Phase-Modulated Full-Bridge Converter
LTC4440 VCC BOOST INP GND TG TS
INPUT (INP) 2V/DIV
LTC4440 VCC LTC3722-1 VCC 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 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
PACKAGE/ORDER INFORMATION
TOP VIEW INP GND VCC GND 1 2 3 4 8 7 6 5 TS TG BOOST NC
ORDER PART NUMBER LTC4440EMS8E MS8E PART MARKING LTF9
VCC 1 GND 2 INP 3
9
MS8E PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 125C, JA = 40C/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 IVCC PARAMETER DC Supply Current Normal Operation UVLO Undervoltage Lockout Threshold CONDITIONS Main Supply (VCC)
The denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = VBOOST = 12V, VTS = GND = 0V, unless otherwise noted.
MIN TYP MAX UNITS
INP = 0V VCC < UVLO Threshold (Falling) - 0.1V VCC Rising VCC Falling Hysteresis

UVLO
Bootstrapped Supply (BOOST - TS) IBOOST DC Supply Current Normal Operation UVLO Undervoltage Lockout Threshold INP = 0V VBOOST - VTS < UVLOHS(FALLING) - 0.1V, VCC = INP = 5V VBOOST - VTS Rising VBOOST - VTS Falling Hysteresis INP Ramping High INP Ramping Low

UVLOHS
Input Signal (INP) VIH VIL VIH - VIL IINP High Input Threshold Low Input Threshold Input Voltage Hysteresis Input Pin Bias Current

2
U
U
W
WW
U
W
(Note 1)
Peak Output Current < 1s (TG) ............................... 4A Driver Output TG (with Respect to TS) ..... - 0.3V to 15V Operating Ambient Temperature Range (Note 2) .............................................. - 40C to 85C Junction Temperature (Note 3) ............................ 125C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
TOP VIEW 6 BOOST 5 TG 4 TS
ORDER PART NUMBER LTC4440ES6 S6 PART MARKING LTZY
S6 PACKAGE 6-LEAD PLASTIC SOT-23
TJMAX = 125C, JA = 230C/W
250 25 5.7 5.4 6.5 6.2 300
400 80 7.3 7.0
A A 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
A A V V mV V V V A
4440f
1.3 0.85
2 1.6 2
LTC4440
ELECTRICAL CHARACTERISTICS
SYMBOL VOH VOL IPU RDS tr tf tPLH tPHL 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 TA = 25C. VCC = VBOOST = 12V, VTS = GND = 0V, unless otherwise noted.
CONDITIONS ITG = -10mA, VOH = VBOOST - VTG ITG = 100mA

MIN
TYP 0.7 150
MAX
UNITS V
220 2.2
mV A ns ns ns ns
1.7
2.4 1.5 10 100 7 70
Switching Timing 10% - 90%, CL = 1nF 10% - 90%, CL = 10nF 10% - 90%, CL = 1nF 10% - 90%, CL = 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 0C to 70C. Specifications over the -40C to 85C 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 * JAC/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 40C/W.
TYPICAL PERFOR A CE CHARACTERISTICS
VCC Supply Quiescent Current vs Voltage
300 250 QUIESCENT CURRENT (A) INP = VCC 200 150 100 50 0 QUIESCENT CURRENT (A) TA = 25C 500 INP = 0V 450 400 350 300 250 200 150 100 50 0 0 5 10 VCC SUPPLY VOLTAGE (V) 15
4440 G01
OUTPUT (TG - TS) VOLTAGE (mV)
UW
BOOST - TS Supply Quiescent Current vs Voltage
TA = 25C
170 165 160 155 150 145 140
Output Low Voltage (VOL) vs Supply Voltage
ITG = 100mA TA = 25C
INP = VCC
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 (VOH) vs Supply Voltage
15
OUTPUT VOLTAGE (TG - TS) (V)
VCC SUPPLY QUIESCENT CURRENT (A)
TA = 25C
1.8
14
INPUT THRESHOLD (V)
13 ITG = -1mA 12 11 10 9 8 7 8 9 10 12 13 14 11 BOOST - TS SUPPLY VOLTAGE (V) 15
4440 G04
ITG = -10mA ITG = -100mA
2MHz Operation
300 INPUT (INP) 5V/DIV
CURRENT (A)
VCC SUPPLY VOLTAGE (V)
OUTPUT (TG) 5V/DIV
VCC = 12V
250ns/DIV
Boost Supply Current vs Temperature
500 450 400
CURRENT (A)
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
UW
4440 G07
Input Thresholds (INP) vs Supply Voltage
2.0 TA = 25C VIH (INPUT HIGH THRESHOLD)
VCC Supply Current at TTL Input Levels
380 360 340 320 300 280 INP = 0.8V 260 240 220 200 8 12 10 VCC SUPPLY VOLTAGE (V) 14
4440 G06
TA = 25C
INP = 2V
1.6 1.4 1.2 1.0 0.8 7 9 11 13 VCC SUPPLY VOLTAGE (V) 15
4440 G05
VIL (INPUT LOW THRESHOLD)
VCC Supply Current (VCC = 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
VCC 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
VIH (VCC = 12V) VIH (VCC = 15V) VIH (VCC = 8V) VIL (VCC = 12V) VIL (VCC = 15V) VIL (VCC = 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 VIH-VIL (VCC = 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
RDS ()
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 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. 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.
4440f
UW
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
VIH-VIL (VCC = 12V) VIH-VIL (VCC = 15V)
BOOST - TS = 12V
TEMPERATURE (C)
TEMPERATURE (C)
Propagation Delay vs Temperature (VCC = BOOST = 12V)
35 30 25 20 15 10 5 tPLH tPHL
60
90
120
4440 G15
0 -60
-30
0
30
60
90
120
4440 G16
TEMPERATURE (C)
TEMPERATURE (C)
U
U
U
5
LTC4440
PI FU CTIO S
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. Exposed Pad (Pin 9): Ground. Must be electrically connected to Pins 2 and 4 and soldered to PCB ground for optimum thermal performance.
BLOCK DIAGRA
8V TO 15V GND
TI I G DIAGRA
6
W
W
U
U
UW
U
BOOST VCC UNDERVOLTAGE LOCKOUT HIGH SIDE UNDERVOLTAGE LOCKOUT
VIN UP TO 80V, TRANSIENT UP TO 100V
TG TS
BOOST
INP
LEVEL SHIFTER
4440 BD
GND
TS
INPUT RISE/FALL TIME < 10ns INPUT (INP) VIH VIL
OUTPUT (TG) tr tPLH tf tPHL
90% 10%
4440 TD
4440f
LTC4440
APPLICATIO S I FOR ATIO
Overview The LTC4440 receives a ground-referenced, low voltage digital input signal to drive a high side N-channel power MOSFET whose drain can float up to 100V above ground, eliminating the need for a transformer between the low voltage control signal and the high side gate driver. The LTC4440 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 LTC4440 reduces the switching losses of the power MOSFET, which increase with transition time. The LTC4440 is capable of driving a 1nF load with 10ns rise and 7ns fall times using a bootstrapped supply voltage VBOOST-TS of 12V. Input Stage The LTC4440 employs TTL/CMOS compatible input thresholds that allow a low voltage digital signal to drive standard power MOSFETs. The LTC4440 contains an internal voltage regulator that biases the input buffer, allowing the input thresholds (VIH = 1.6V, VIL = 1.25V) to be 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 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's output stage is shown in Figure 3 . 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's peak pull-up (Q1) current is 2.4A while the pull-down (N1) resistance is 1.5. The low impedance of N1 is required to discharge the power MOSFET's gate capacitance during high-to-low signal transitions. When 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 can drive a 1nF load with a 10ns rise time and 7ns fall time. The LTC4440'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.
4440f
U
BOOST VIN UP TO 100V LTC4440 Q1 TG POWER MOSFET N1 CGS LOAD INDUCTOR
4440 F03
W
UU
CGD
TS
V-
Figure 3. Capacitance Seen by TG During Switching
the power MOSFET's gate is pulled low (gate shorted to source through N1) by the LTC4440, 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 is used to drive a low side MOSFET. When the low side power MOSFET's gate is pulled low by the LTC4440, 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.
7
LTC4440
APPLICATIO S I FOR ATIO
Power Dissipation
To ensure proper operation and long-term reliability, the LTC4440 must not operate beyond its maximum temperature rating. Package junction temperature can be calculated by: TJ = TA + PD (JA) where: TJ = Junction Temperature TA = Ambient Temperature PD = Power Dissipation JA = Junction-to-Ambient Thermal Resistance Power dissipation consists of standby and switching power losses: PD = PSTDBY + PAC where: PSTDBY = Standby Power Losses PAC = AC Switching Losses The LTC4440 consumes very little current during standby. The DC power loss at VCC = 12V and VBOOST-TS = 12V is only (250A + 110A)(12V) = 4.32mW. 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) Transition state power losses are due to both AC currents required to charge and discharge the driver's internal nodal capacitances and cross-conduction currents in the internal gates.
8
U
Undervoltage Lockout (UVLO) The LTC4440 contains both low side and high side undervoltage lockout detectors that monitor VCC and the bootstrapped supply VBOOST-TS. When VCC falls below 6.2V, the internal buffer is disabled and the output pin OUT is pulled down to TS. When VBOOST - TS falls below 6.9V, OUT is pulled down to TS. When both supplies are undervoltage, OUT is pulled low to TS and the chip enters a low current mode, drawing approximately 25A from VCC and 86A from BOOST. Bypassing and Grounding The LTC4440 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: 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. B. Use a low inductance, low impedance ground plane to reduce any ground drop and stray capacitance. Remember that the LTC4440 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 package to the board. Correctly soldered to a 2500mm2 doublesided 1oz copper board, the LTC4440 has a thermal resistance of approximately 40C/W. Failure to make good thermal contact between the exposed back side and the copper board will result in thermal resistances far greater than 40C/W.
4440f
W
UU
LTC3722/LTC4440 420W 36V-72VIN to 12V/35A Isolated Full-Bridge Supply
L1 1.3H 51 2W D2 D3 0.47F 0.47F 100V 100V D4 D5 4 11 VOUT 3 12V T1 5(105H):1:1 D1 13k 1/2W
VIN
VIN
36V TO 72V
1F 100V
-VIN
1F 100V x4
12V
3
*
2
10 0.47F 100V
A C
51 2W
*
1 1 8 VH
820pF 200V 15 1W D6 L3 0.85H VH
-VOUT VOUT VOUT
VCC 6 INP BOOST LTC4440EMS8E 7 TG GND GND TS Si7852DP x2 Si7852DP x2
* *
4 4 2
2
*
TYPICAL APPLICATIO S
8 0.22F 8 0.22F 4 11
*
L2 150nH 10 D 12V 8 Q1 Q2 2
*
B 12V
C1, C2 180F 16V x2
+
1F Si7852DP x4 -VOUT -VOUT 12V/35A
*
Si7852DP x2 Si7852DP x2 Q4 T2 5:5(105H):1:1 D7 6 D8 1 D9 3.3V 4.87k 1/4W Si7852DP x4 Q3
7
1.1k ISNS 0.02 1.5W 0.02 1.5W C3 68F 20V 12V 100
L4 1mH
+
*
1.10k 6 CSE+ 9 100 5 220pF SYNC T3 1(1.5mH):0.5 1 4
4.87k 1/4W 909 5 CSE- 2 3 1.10k 11 ME ME2 CSF+ LTC3901EGN GND PGND GND2 PGND2 8 4 10 13 909 12 CSF- 14 15 16 MF MF2 VCC 1 PVCC TIMER 7 330pF VOUT
VOUT
0.47F, 100V TDK C3216X7R2A474M 1F, 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
39.2k
100 MMBT3904
1k
20k 22 8 B D 10 10 C 21 17 16 OUTA OUTB OUTC OUTD OUTF OUTE LTC3722EGN-1 CS 3 750 20 19 15 ISNS 5VREF A 11 9 ADLY PDLY
0.1F
1F 1F
D10 10V
VIN
12V
4.99k
220pF
20k 1/4W 200k
-VOUT 330 1 MOC207 6 0.047F 3 2.7k 9.53k 22nF 470 1/4W 10k
150
10
SBUS
18
182k
VIN
12 CT SPRG RLEB FB GND PGND 24 13 23 10k 33k 8.25k 68nF 5 6 22 MMBT3904
UVLO VREF 8 1 5.1k 180pF
DPRG NC SYNC
SS COMP 7 4 D11 330pF 2.2nF 5 8 2 1
220pF
14 2 5VREF 150k
V+ LT1431CS8 COLL REF 100k D12 5.1V GND-F GND-S 6 5
8 2.49k -VOUT
4440 TA03
1F
30.1k
0.47F
220pF
C4 2.2nF 250V
U
VCC 6 INP BOOST LTC4440EMS8E 7 TG GND GND TS 7
* *
LTC4440
9
4440f
LTC4440
*
*
*
TYPICAL APPLICATIO S
2 4 0.1F 0.1F 5 A B VF 1.5k ISNS 12V L4 1mH D5 1 D6 1k 6 11 CSF+ 9 100 220pF A B 6 4 3 SDRA CS COMP SPRG RLEB SS DPRG VREF 1 243k 68nF 0.47F 330pF 750 22nF 5 8 2 100k D8 10V 16 12 14 9 150k 270pF 33k 10k 11 10 MOC207 6 0.1F 3 V+ LT1431CS8 1 COLL REF C4 2.2nF 250V GND-F GND-S 6 5
4440 TA05
2 4
3 1F 100V
*
VCC 6 3 INP BOOST LTC4440ES6 5 4.7 TG GND TS 2 11 9 VF D2 7 1k 1/4W VCC 6 3 A INP BOOST LTC4440ES6 5 4.7 Si7852DP TG GND TS Si7852DP 4
*
+
C1, C2 47F 16V x2
12V/20A 1F
97 Si7852DP Si7852DP VE 6.19k 1/4W 6.19k 1/4W 866 12 CSF - 14 15 MF MF2 6 CSE+ LTC3901EGN GND PGND GND2 PGND2 8 4 10 13 1k Si7370DP x2 Si7370DP x2
42VIN
96
48VIN
-VOUT -VOUT
56VIN
95
+
*
EFFICIENCY (%)
R1 0.03 1.5W R2 0.03 1.5W C3 68F 20V
866 5 CSE- 2 3 16 ME ME2 VCC 1 PVCC TIMER 7 470pF VOUT -VOUT 42.2k 100
VOUT
94 T2 1(1.5mH):0.5 1 4 SYNC
1k
93
6 20 0.1F 22 8 5
8
10 12 16 14 LOAD CURRENT (A)
18
MMBT3904 1F 4.7F D7 10V
VIN ISNS 665
12V
200 1/4W 2 SDRB LTC3723EGN-1 15 UVLO FB GND CT 13 7 8 1F DRVA 5 VCC DRVB
30k 1/4W
22nF 1
100 1/4W 10k 1k 9.53k 22nF
464k
1.5nF
8 2.49k -VOUT
66.5k
1F, 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
U
10
LTC3723-1 240W 42-56VIN to 12V/20A Isolated 1/4Brick (2.3" x 1.45")
VF 470pF 100V 12V D3 T1 4T:6T(65HMIN):6T:2T:2T VE L6 1.25H VOUT VOUT VE 1 10 1W D4
L5 0.56H
VIN
VIN
42V TO 56V
1F 100V
-VIN
1F 100V x3
12V
1
B
* *
4440f
LTC4440
PACKAGE DESCRIPTION
MS8E Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1662)
2.794 0.102 (.110 .004) 0.889 0.127 (.035 .005)
3.00 0.102 (.118 .004) (NOTE 3)
5.23 (.206) MIN
2.083 0.102 3.20 - 3.45 (.082 .004) (.126 - .136) 0.254 (.010)
0.42 0.038 (.0165 .0015) TYP
0.65 (.0256) BSC
GAUGE PLANE 0.53 0.152 (.021 .006) DETAIL "A" 0.18 (.007) 1.10 (.043) MAX
RECOMMENDED SOLDER PAD LAYOUT
SEATING NOTE: PLANE 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
0.62 MAX
0.95 REF
3.85 MAX 2.62 REF
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.20 BSC 1.00 MAX DATUM `A'
0.30 - 0.50 REF
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING
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 its circuits as described herein will not infringe on existing patent rights.
U
8
7 65
0.52 (.0205) REF
1
2.06 0.102 (.081 .004) 1.83 0.102 (.072 .004)
DETAIL "A" 0 - 6 TYP
4.90 0.152 (.193 .006)
3.00 0.102 (.118 .004) (NOTE 4)
1
23
4
8 0.86 (.034) REF BOTTOM VIEW OF EXPOSED PAD OPTION
0.22 - 0.38 (.009 - .015) TYP
0.65 (.0256) BSC
0.127 0.076 (.005 .003)
MSOP (MS8E) 0603
S6 Package 6-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC (NOTE 4)
1.22 REF
1.4 MIN
2.80 BSC
1.50 - 1.75 (NOTE 4) PIN ONE ID
0.95 BSC 0.80 - 0.90
0.30 - 0.45 6 PLCS (NOTE 3)
0.01 - 0.10
0.09 - 0.20 (NOTE 3)
1.90 BSC
S6 TSOT-23 0302
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
4440f
11
LTC4440
TYPICAL APPLICATIO
L1 0.56H VIN 48VIN -VIN 1 A 3 VCC 6 INP BOOST LTC4440ES6 5 TG GND TS 2 4 0.22F 12V B Si7852DP x2 VIN 12V MMBT3904 15k 1/4W 215k 15 UVLO DPRG 100pF 1F 1F 30.1k 330pF 12V MMBZ5242B 12 62k VREF RAMP CT SPRG GND CS SS 1 9 150pF 0.47F 8 16 10k 470pF 0.47F 7 FB 1k 2N7002 4.7k 11V A 6 120 5 DRVA VCC LTC3723EGN-2 SDRA COMP 10 14 13 D4 D5 4 DRVB SDRB 2 22 T3 1(1.5mH):0.5 1 4 D2 L3 1mH 1 D3 6 1F 100V 1F 100V 1F 100V VIN 2 11V D1 1F 100V 1F 100V T2 70(980H):1 8 7
LTC3723-2/LTC4440/LTC3901 240W 42V-56VIN to Unregulated 12V Half-Bridge Converter
VE
* *
*
3
Si7852DP x2
1F 100V
* *
*
+ C3
68F
*
RELATED PARTS
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4440f LT/TP 1004 1K * PRINTED IN USA
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
U
7 9 11 VF L2 0.22H 1500pF 100V 20 1W VOUT VOUT 4
+
CS+ 1
C2 180F 16V 1F
3
5
Si7370DP x2 C1 2.2nF 250V T1 5:4:4:2:2 VF 4.7k 1/4W 10k 11 CSF+ 9 SYNC 3k 12
Si7370DP x2 -VOUT VE 4.7k 1/4W 10k 14 15 6 CSE+ 3k 5 2 3 16 33.2k 1 100 MMBT3904 1k 1F 1F
4440 TA04
-VOUT
CSF - MF MF2
CSE- ME ME2 VCC PVCC TIMER 7 330pF
VOUT
LTC3901EGN GND PGND GND2 PGND2 8 4 10 13
*
0.1F 8
*
100 5
3 11
220pF 0.22F B CS+ 1F, 100V TDK C4532X7R2A105M C1: MURATA DE2E3KH222MB3B C2: SANYO 16SP180M C3: AVX TPSE686M020R0150 D1-D3: BAS21 D4, D5: MMBD914 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
-VOUT
7.5
7.5
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2003

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