LTC4440AIMS8E-5#TRPBF

LTC4440A-5 High Speed, High Voltage, High Side Gate Driver Features Description n n n 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. n n n n n n n n 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 n n n n n n 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 For more information www.linear.com/LTC4440A-5 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 2 For more information www.linear.com/LTC4440A-5 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 For more information www.linear.com/LTC4440A-5 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 4440a5f 4 For more information www.linear.com/LTC4440A-5 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 For more information www.linear.com/LTC4440A-5 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 6 For more information www.linear.com/LTC4440A-5 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 For more information www.linear.com/LTC4440A-5 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 4440a5f 8 For more information www.linear.com/LTC4440A-5 A 1 4 2 For more information www.linear.com/LTC4440A-5 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