SI7155DP-T1-GE3

Si7155DP www.vishay.com Vishay Siliconix P-Channel 40 V (D-S) MOSFET FEATURES PowerPAK® SO-8 Single D 5 D 6 D 7 • TrenchFET® Gen III p-channel power MOSFET D 8 • Industry leadership RDS(on) specifications (as of November 2017) • 100 % Rg and UIS tested 6. 15 m m 1 5 5.1 mm Top View 3 4 S G Bottom View 2 S • Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 1 S APPLICATIONS • Load switch PRODUCT SUMMARY VDS (V) RDS(on) max. () at VGS = 10 V RDS(on) max. () at VGS = 4.5 V Qg typ. (nC) ID (A) Configuration S • Adapter and charger switch -40 0.0036 0.0046 107 -100 a, g Single G • Motor drive control • DC/DC converter • Power supplies • Battery management D P-Channel MOSFET ORDERING INFORMATION Package Lead (Pb)-free and halogen-free PowerPAK SO-8 Si7155DP-T1-GE3 ABSOLUTE MAXIMUM RATINGS (TA = 25 °C, unless otherwise noted) PARAMETER Drain-source voltage Gate-source voltage Continuous drain current (TJ = 150 °C) SYMBOL VDS VGS TC = 25 °C TC = 70 °C TA = 25 °C TA = 70 °C Pulsed drain current (t = 100 μs) ID IDM Continuous source-drain diode current TC = 25 °C TA = 25 °C IS Single pulse avalanche current Single pulse avalanche energy L = 0.1 mH IAS EAS TC = 25 °C TC = 70 °C Maximum power dissipation TA = 25 °C TA = 70 °C Operating junction and storage temperature range Soldering recommendations (peak temperature) c PD TJ, Tstg LIMIT -40 ± 20 -100 a -100 a -31 b, c -24.8 b, c -200 -94.5 -5.6 b, c -50 125 104 66.6 6.25 b, c 4 b, c -55 to +150 260 UNIT V A mJ W °C THERMAL RESISTANCE RATINGS PARAMETER SYMBOL TYPICAL MAXIMUM UNIT Maximum junction-to-ambient b t  10 s RthJA 15 20 °C/W 0.9 1.2 Maximum junction-to-case (drain) Steady state RthJC Notes a. Package limited b. Surface mounted on 1" x 1" FR4 board c. t = 10 s d. See solder profile (www.vishay.com/doc?73257). The PowerPAK 1212-8 is a leadless package. The end of the lead terminal is exposed copper (not plated) as a result of the singulation process in manufacturing. A solder fillet at the exposed copper tip cannot be guaranteed and is not required to ensure adequate bottom side solder interconnection e. Rework conditions: manual soldering with a soldering iron is not recommended for leadless components f. Maximum under steady state conditions is 54 °C/W g. TC = 25 °C S17-1810-Rev. A, 11-Dec-17 Document Number: 75769 1 For technical questions, contact: pmostechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Si7155DP www.vishay.com Vishay Siliconix SPECIFICATIONS (TJ = 25 °C, unless otherwise noted) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT V Static Drain-source breakdown voltage VDS VGS = 0 V, ID = -250 μA -40 - - VDS/TJ ID = -10 mA - -43 - VGS(th) temperature coefficient VGS(th)/TJ ID = -250 μA - 5 - Gate-source threshold voltage VDS temperature coefficient mV/°C VGS(th) VDS = VGS, ID = -250 μA -1 - -2.3 V Gate-source leakage IGSS VDS = 0 V, VGS = ± 20 V - - 100 nA Zero gate voltage drain current IDSS On-state drain current a ID(on) Drain-source on-state resistance a Forward transconductance a RDS(on) gfs VDS = -40 V, VGS = 0 V - - -1 VDS = -40 V, VGS = 0 V, TJ = 70 °C - - -15 VDS  -10 V, VGS = -10 V -40 - - A  VGS = -10 V, ID = -20 A - 0.0030 0.0036 VGS = -4.5 V, ID = -20 A - 0.0038 0.0046 VDS = -15 V, ID = -20 A - 95 - - 12 900 - VDS = -20 V, VGS = 0 V, f = 1 MHz - 930 - - 1370 - VDS = -20 V, VGS = -10 V, ID = -20 A - 220 330 - 107 161 VDS = -20 V, VGS = -4.5 V, ID = -20 A - 23.7 - - 37.2 - f = 1 MHz 0.8 2 3.5 - 15 30 μA S Dynamic b Input capacitance Ciss Output capacitance Coss Reverse transfer capacitance Crss Total gate charge Qg Gate-source charge Qgs Gate-drain charge Qgd Gate resistance Rg Turn-on delay time Rise time Turn-off delay time Fall time Turn-on delay time Rise time Turn-off delay time Fall time td(on) tr VDD = -20 V, RL = 1 , ID  -20 A, VGEN = -10 V, Rg = 1  - 43 86 - 125 250 tf - 85 170 td(on) - 55 110 - 185 370 - 130 260 - 117 235 td(off) tr td(off) VDD = -20 V, RL = 1 , ID  -20 A, VGEN = -4.5 V, Rg = 1  tf pF nC  ns Drain-Source Body Diode Characteristics Continuous source-drain diode current IS Pulse diode forward current ISM Body diode voltage VSD Body diode reverse recovery time trr Body diode reverse recovery charge Qrr Reverse recovery fall time ta Reverse recovery rise time tb TC = 25 °C IS = -5 A, VGS = 0 V IF = -20 A, di/dt = 100 A/μs, TJ = 25 °C - - -94.5 - - -200 - -0.73 -1.1 - 41 82 ns - 39 78 nC - 22 - - 19 - A V ns Notes a. Pulse test; pulse width  300 μs, duty cycle  2 % b. Guaranteed by design, not subject to production testing  Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. S17-1810-Rev. A, 11-Dec-17 Document Number: 75769 2 For technical questions, contact: pmostechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Si7155DP www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 100 150 VGS = 10 V thru 4 V 120 2nd line ID - Drain Current (A) 2nd line ID - Drain Current (A) 80 60 VGS = 3 V 40 20 90 60 TC = 25 °C TC = 125 °C 30 TC = -55 °C VGS = 2 V 0 0 1 2 3 4 0 5 0 1 2 3 4 VDS - Drain-to-Source Voltage (V) 2nd line VGS - Gate-to-Source Voltage (V) 2nd line Output Characteristics Transfer Characteristics 5 Axis Title Axis Title 0.0050 17 000 10000 10000 13 600 1000 0.0038 VGS = 10 V 0.0032 100 1000 10 200 1st line 2nd line VGS = 4.5 V 2nd line C - Capacitance (pF) 0.0044 1st line 2nd line 6800 100 Crss 3400 0.0026 0.0020 16 32 48 64 Coss 0 10 0 10 0 80 5 10 20 ID - Drain Current (A) 2nd line VDS - Drain-to-Source Voltage (V) 2nd line On-Resistance vs. Drain Current and Gate Voltage Capacitance Axis Title 8 1000 1st line 2nd line VDS = 10 V, 20 V, 30 V 4 100 2 0 10 50 100 150 200 250 2nd line RDS(on) - On-Resistance (Normalized) ID = 20 A 6 10000 1.8 10000 0 25 Axis Title 10 2nd line VGS - Gate-to-Source Voltage (V) 15 ID = 20 A 1.6 VGS = 10 V 1000 1.4 VGS = 4.5 V 1.2 1.0 100 0.8 0.6 10 -50 -25 0 25 50 75 100 125 150 Qg - Total Gate Charge (nC) 2nd line TJ - Junction Temperature (°C) 2nd line Gate Charge On-Resistance vs. Junction Temperature S17-1810-Rev. A, 11-Dec-17 1st line 2nd line 2nd line RDS(on) - On-Resistance (Ω) Ciss Document Number: 75769 3 For technical questions, contact: pmostechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Si7155DP www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) Axis Title Axis Title 1.0 10000 10000 ID = 250 μA 0.7 2nd line VGS(th) - Variance (V) 1000 TJ = 25 °C TJ = 150 °C 1 100 0.1 1000 0.4 ID = 5 mA 0.1 100 -0.2 0.01 -0.5 10 0 0.2 0.4 0.6 0.8 10 -50 1.0 -25 0 25 50 75 100 125 150 VSD - Source-to-Drain Voltage (V) 2nd line TJ - Temperature (°C) 2nd line Source-Drain Diode Forward Voltage Threshold Voltage Axis Title Axis Title 0.020 ID = 20 A 0.016 10000 500 10000 400 1000 300 1st line 2nd line TJ = 125 °C 0.008 2nd line Power (W) 1000 0.012 1st line 2nd line 2nd line RDS(on) - On-Resistance (Ω) 1st line 2nd line 10 1st line 2nd line 2nd line IS - Source Current (A) 100 200 100 100 0.004 100 TJ = 25 °C 0 10 0 2 4 6 8 10 0 0.001 10 0.01 0.1 1 10 VGS - Gate-to-Source Voltage (V) 2nd line Time (s) 2nd line On-Resistance vs. Gate-to-Source Voltage Single Pulse Power, Junction-to-Ambient Axis Title 1000 10000 IDM limited 100 μs ID limited 1 ms 1000 10 10 ms Limited by RDS(on) (1) 1 100 ms 1s 1st line 2nd line 2nd line ID - Drain Current (A) 100 100 10 s 0.1 TA = 25 °C Single pulse 0.01 0.01 (1) DC BVDSS limited 10 0.1 1 10 100 VDS - Drain-to-Source Voltage (V) VGS > minimum VGS at which RDS(on) is specified Safe Operating Area, Junction-to-Ambient S17-1810-Rev. A, 11-Dec-17 Document Number: 75769 4 For technical questions, contact: pmostechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Si7155DP www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) Axis Title 150 10000 1000 90 60 1st line 2nd line 2nd line ID - Drain Current (A) 120 Limited by Package 100 30 0 10 0 25 50 75 100 125 150 TC - Case Temperature (°C) 2nd line Current Derating a Axis Title Axis Title 125 10000 3.0 100 10000 2.4 1.8 1st line 2nd line 50 2nd line Power (W) 1000 1st line 2nd line 2nd line Power (W) 1000 75 1.2 100 25 100 0.6 0 10 0 25 50 75 100 125 150 0 10 0 25 50 75 100 125 TC - Case Temperature (°C) 2nd line TA - Ambient Temperature (°C) 2nd line Power, Junction-to-Case Power, Junction-to-Ambient 150 Note a. The power dissipation PD is based on TJ max. = 150 °C, using junction-to-case thermal resistance, and is more useful in settling the upper dissipation limit for cases where additional heatsinking is used. It is used to determine the current rating, when this rating falls below the package limit S17-1810-Rev. A, 11-Dec-17 Document Number: 75769 5 For technical questions, contact: pmostechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Si7155DP www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) Axis Title 10000 Duty Cycle = 0.5 Notes: 0.2 1000 1st line 2nd line Normalized Effective Transient Thermal Impedance 1 PDM 0.1 0.1 t1 t2 t 1. Duty cycle, D = 1 t2 2. Per unit base = RthJA = 54 °C/W 0.05 0.02 3. TJM - TA = PDMZthJA Single pulse 0.01 0.0001 0.001 0.01 100 (t) 4. Surface mounted 0.1 1 10 100 10 1000 Square Wave Pulse Duration (s) 2nd line Normalized Thermal Transient Impedance, Junction-to-Ambient Axis Title 1 10000 0.2 0.1 1000 0.05 1st line 2nd line Normalized Effective Transient Thermal Impedance Duty Cycle = 0.5 0.02 0.1 Single pulse 100 0.01 0.0001 10 0.001 0.01 0.1 1 10 Square Wave Pulse Duration (s) 2nd line Normalized Thermal Transient Impedance, Junction-to-Case                     Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package / tape drawings, part marking, and reliability data, see www.vishay.com/ppg?75769. S17-1810-Rev. A, 11-Dec-17 Document Number: 75769 6 For technical questions, contact: pmostechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Package Information www.vishay.com Vishay Siliconix PowerPAK® SO-8, (Single/Dual) L H E2 K E4 θ D4 W 1 M 1 Z 2 D5 D2 e 2 D1 D 2 D 3 4 θ 4 b 3 L1 E3 θ A1 Backside View of Single Pad H K E2 E4 L 1 D1 D5 2 D2 Detail Z K1 2 E1 E D3 (2x) D4 c A θ 3 4 Notes 1. Inch will govern. 2 Dimensions exclusive of mold gate burrs. 3. Dimensions exclusive of mold flash and cutting burrs. DIM. A A1 b c D D1 D2 D3 D4 D5 E E1 E2 E3 E4 e K K1 H L L1  W M b D2 E3 Backside View of Dual Pad MILLIMETERS INCHES MIN. NOM. MAX. MIN. NOM. MAX. 0.97 1.04 0.41 0.28 5.15 4.90 3.76 1.50 0.57 typ. 3.98 typ. 6.15 5.89 3.66 3.78 0.75 typ. 1.27 BSC 1.27 typ. 0.61 0.61 0.13 0.25 0.125 typ. 1.12 0.05 0.51 0.33 5.26 5.00 3.91 1.68 0.038 0 0.013 0.009 0.199 0.189 0.140 0.052 0.044 0.002 0.020 0.013 0.207 0.197 0.154 0.066 6.25 5.99 3.84 3.91 0.238 0.228 0.137 0.145 0.71 0.71 0.20 12° 0.36 0.022 0.020 0.020 0.002 0° 0.006 0.041 0.016 0.011 0.203 0.193 0.148 0.059 0.0225 typ. 0.157 typ. 0.242 0.232 0.144 0.149 0.030 typ. 0.050 BSC 0.050 typ. 0.024 0.024 0.005 0.010 0.005 typ. 0.33 0.23 5.05 4.80 3.56 1.32 6.05 5.79 3.48 3.68 0.56 0.51 0.51 0.06 0° 0.15 0.246 0.236 0.151 0.154 0.028 0.028 0.008 12° 0.014 ECN: S17-0173-Rev. L, 13-Feb-17 DWG: 5881 Revison: 13-Feb-17 1 Document Number: 71655 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 VISHAY SILICONIX www.vishay.com Power MOSFETs Application Note AN821 PowerPAK® SO-8 Mounting and Thermal Considerations by Wharton McDaniel MOSFETs for switching applications are now available with die on resistances around 1 m and with the capability to handle 85 A. While these die capabilities represent a major advance over what was available just a few years ago, it is important for power MOSFET packaging technology to keep pace. It should be obvious that degradation of a high performance die by the package is undesirable. PowerPAK is a new package technology that addresses these issues. In this application note, PowerPAK’s construction is described. Following this mounting information is presented including land patterns and soldering profiles for maximum reliability. Finally, thermal and electrical performance is discussed. PowerPAK SO-8 SINGLE MOUNTING The PowerPAK single is simple to use. The pin arrangement (drain, source, gate pins) and the pin dimensions are the same as standard SO-8 devices (see figure 2). Therefore, the PowerPAK connection pads match directly to those of the SO-8. The only difference is the extended drain connection area. To take immediate advantage of the PowerPAK SO-8 single devices, they can be mounted to existing SO-8 land patterns. THE PowerPAK PACKAGE The PowerPAK package was developed around the SO-8 package (figure 1). The PowerPAK SO-8 utilizes the same footprint and the same pin-outs as the standard SO-8. This allows PowerPAK to be substituted directly for a standard SO-8 package. Being a leadless package, PowerPAK SO-8 utilizes the entire SO-8 footprint, freeing space normally occupied by the leads, and thus allowing it to hold a larger die than a standard SO-8. In fact, this larger die is slightly larger than a full sized DPAK die. The bottom of the die attach pad is exposed for the purpose of providing a direct, low resistance thermal path to the substrate the device is mounted on. Finally, the package height is lower than the standard SO-8, making it an excellent choice for applications with space constraints. Standard SO-8 PowerPAK SO-8 Fig. 2 The minimum land pattern recommended to take full advantage of the PowerPAK thermal performance see Application Note 826, Recommended Minimum Pad Patterns With Outline Drawing Access for Vishay Siliconix MOSFETs. Click on the PowerPAK SO-8 single in the index of this document. In this figure, the drain land pattern is given to make full contact to the drain pad on the PowerPAK package. Fig. 1 Revision: 16-Mai-13 PowerPAK 1212 Devices Document Number: 71622 1 For technical questions, contact: powermosfettechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 APPLICATION NOTE This land pattern can be extended to the left, right, and top of the drawn pattern. This extension will serve to increase the heat dissipation by decreasing the thermal resistance from the foot of the PowerPAK to the PC board and therefore to the ambient. Note that increasing the drain land area beyond a certain point will yield little decrease in foot-to-board and foot-to-ambient thermal resistance. Under specific conditions of board configuration, copper weight and layer stack, experiments have found that more than about 0.25 in2 to 0.5 in2 of additional copper (in addition to the drain land) will yield little improvement in thermal performance. Application Note AN821 www.vishay.com Vishay Siliconix PowerPAK® SO-8 Mounting and Thermal Considerations PowerPAK SO-8 DUAL The pin arrangement (drain, source, gate pins) and the pin dimensions of the PowerPAK SO-8 dual are the same as standard SO-8 dual devices. Therefore, the PowerPAK device connection pads match directly to those of the SO-8. As in the single-channel package, the only exception is the extended drain connection area. Manufacturers can likewise take immediate advantage of the PowerPAK SO-8 dual devices by mounting them to existing SO-8 dual land patterns. For the lead (Pb)-free www.vishay.com/doc?73257. solder profile, see To take the advantage of the dual PowerPAK SO-8’s thermal performance, the minimum recommended land pattern can be found in Application Note 826, Recommended Minimum Pad Patterns With Outline Drawing Access for Vishay Siliconix MOSFETs. Click on the PowerPAK 1212-8 dual in the index of this document. The gap between the two drain pads is 24 mils. This matches the spacing of the two drain pads on the PowerPAK SO-8 dual package. Fig. 3 Solder Reflow Temperature Profile REFLOW SOLDERING Ramp-Up Rate Vishay Siliconix surface-mount packages meet solder reflow reliability requirements. Devices are subjected to solder reflow as a test preconditioning and are then reliability-tested using temperature cycle, bias humidity, HAST, or pressure pot. The solder reflow temperature profile used, and the temperatures and time duration, are shown in figures 3 and 4. Temperature at 150 - 200 °C + 3 °C /s max. 120 s max. Temperature Above 217 °C 60 - 150 s Maximum Temperature 255 + 5/- 0 °C Time at Maximum Temperature 30 s Ramp-Down Rate + 6 °C/s max. 30 s 260 °C 3 °C(max) 6 °C/s (max.) 217 °C 150 - 200 °C APPLICATION NOTE 150 s (max.) 60 s (min.) Pre-Heating Zone Reflow Zone Maximum peak temperature at 240 °C is allowed. Fig. 4 Solder Reflow Temperatures and Time Durations Revision: 16-Mai-13 Document Number: 71622 2 For technical questions, contact: powermosfettechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Application Note AN821 www.vishay.com Vishay Siliconix PowerPAK® SO-8 Mounting and Thermal Considerations THERMAL PERFORMANCE Introduction A basic measure of a device’s thermal performance is the junction-to-case thermal resistance, RthJC, or the junction-to-foot thermal resistance, RthJF This parameter is measured for the device mounted to an infinite heat sink and is therefore a characterization of the device only, in other words, independent of the properties of the object to which the device is mounted. Table 1 shows a comparison of the DPAK, PowerPAK SO-8, and standard SO-8. The PowerPAK has thermal performance equivalent to the DPAK, while having an order of magnitude better thermal performance over the SO-8. TABLE 1 - DPAK AND POWERPAK SO-8 EQUIVALENT STEADY STATE PERFORMANCE Thermal Resistance RthJC DPAK PowerPAK SO-8 Standard SO-8 1.2 °C/W 1 °C/W 16 °C/W Thermal Performance on Standard SO-8 Pad Pattern Because of the common footprint, a PowerPAK SO-8 can be mounted on an existing standard SO-8 pad pattern. The question then arises as to the thermal performance of the PowerPAK device under these conditions. A characterization was made comparing a standard SO-8 and a PowerPAK device on a board with a trough cut out underneath the PowerPAK drain pad. This configuration restricted the heat flow to the SO-8 land pads. The results are shown in figure 5. Because of the presence of the trough, this result suggests a minimum performance improvement of 10 °C/W by using a PowerPAK SO-8 in a standard SO-8 PC board mount. The only concern when mounting a PowerPAK on a standard SO-8 pad pattern is that there should be no traces running between the body of the MOSFET. Where the standard SO-8 body is spaced away from the pc board, allowing traces to run underneath, the PowerPAK sits directly on the pc board. Thermal Performance - Spreading Copper Designers may add additional copper, spreading copper, to the drain pad to aid in conducting heat from a device. It is helpful to have some information about the thermal performance for a given area of spreading copper. Figure 6 shows the thermal resistance of a PowerPAK SO-8 device mounted on a 2-in. 2-in., four-layer FR-4 PC board. The two internal layers and the backside layer are solid copper. The internal layers were chosen as solid copper to model the large power and ground planes common in many applications. The top layer was cut back to a smaller area and at each step junction-to-ambient thermal resistance measurements were taken. The results indicate that an area above 0.3 to 0.4 square inches of spreading copper gives no additional thermal performance improvement. A subsequent experiment was run where the copper on the back-side was reduced, first to 50 % in stripes to mimic circuit traces, and then totally removed. No significant effect was observed. Rth vs. Spreading Copper (0 %, 50 %, 100 % Back Copper) 56 Si4874DY vs. Si7446DP PPAK on a 4-Layer Board SO-8 Pattern, Trough Under Drain Impedance (C/watts) 60 Impedance (C/watts) APPLICATION NOTE 50 40 Si4874DY 30 51 46 100 % 41 Si7446DP 0% 20 50 % 36 10 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 Spreading Copper (sq in) 0 0.0001 0.01 1 100 10000 Fig. 6 Spreading Copper Junction-to-Ambient Performance Pulse Duration (sec) Fig. 5 PowerPAK SO-8 and Standard SO-0 Land Pad Thermal Path Revision: 16-Mai-13 Document Number: 71622 3 For technical questions, contact: powermosfettechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Application Note AN821 www.vishay.com Vishay Siliconix PowerPAK® SO-8 Mounting and Thermal Considerations SYSTEM AND ELECTRICAL IMPACT OF PowerPAK SO-8 In any design, one must take into account the change in MOSFET RDS(on) with temperature (figure 7). On-Resistance vs. Junction Temperature R DS(on) - On-Resistance ( ) (Normalized) 1.8 VGS = 10 V ID = 23 A 1.6 1.2 Minimizing the thermal rise above the board temperature by using PowerPAK has not only eased the thermal design but it has allowed the device to run cooler, keep rDS(on) low, and permits the device to handle more current than the same MOSFET die in the standard SO-8 package. 1.0 CONCLUSIONS 1.4 PowerPAK SO-8 has been shown to have the same thermal performance as the DPAK package while having the same footprint as the standard SO-8 package. The PowerPAK SO-8 can hold larger die approximately equal in size to the maximum that the DPAK can accommodate implying no sacrifice in performance because of package limitations. 0.8 0.6 - 50 - 25 0 25 50 75 100 125 150 TJ - Junction Temperature (°C) Fig. 7 MOSFET RDS(on) vs. Temperature A MOSFET generates internal heat due to the current passing through the channel. This self-heating raises the junction temperature of the device above that of the PC board to which it is mounted, causing increased power dissipation in the device. A major source of this problem lies in the large values of the junction-to-foot thermal resistance of the SO-8 package. PowerPAK SO-8 minimizes the junction-to-board thermal resistance to where the MOSFET die temperature is very close to the temperature of the PC board. Consider two devices mounted on a PC board heated to 105 °C by other components on the board (figure 8). PowerPAK SO-8 APPLICATION NOTE Suppose each device is dissipating 2.7 W. Using the junction-to-foot thermal resistance characteristics of the PowerPAK SO-8 and the standard SO-8, the die temperature is determined to be 107 °C for the PowerPAK (and for DPAK) and 148 °C for the standard SO-8. This is a 2 °C rise above the board temperature for the PowerPAK and a 43 °C rise for the standard SO-8. Referring to figure 7, a 2 °C difference has minimal effect on RDS(on) whereas a 43 °C difference has a significant effect on RDS(on). Recommended PowerPAK SO-8 land patterns are provided to aid in PC board layout for designs using this new package. Thermal considerations have indicated that significant advantages can be gained by using PowerPAK SO-8 devices in designs where the PC board was laid out for the standard SO-8. Applications experimental data gave thermal performance data showing minimum and typical thermal performance in a SO-8 environment, plus information on the optimum thermal performance obtainable including spreading copper. This further emphasized the DPAK equivalency. PowerPAK SO-8 therefore has the desired small size characteristics of the SO-8 combined with the attractive thermal characteristics of the DPAK package. Standard SO-8 107 °C 0.8 °C/W 148 °C 16 C/W PC Board at 105 °C Fig. 8 Temperature of Devices on a PC Board Revision: 16-Mai-13 Document Number: 71622 4 For technical questions, contact: powermosfettechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Application Note 826 Vishay Siliconix RECOMMENDED MINIMUM PADS FOR PowerPAK® SO-8 Single 0.260 (6.61) 0.150 (3.81) 0.050 0.174 (4.42) 0.154 (1.27) 0.026 (0.66) (3.91) 0.024 (0.61) 0.050 0.032 0.040 (1.27) (0.82) (1.02) Recommended Minimum Pads Dimensions in Inches/(mm) Return to Index Return to Index APPLICATION NOTE Document Number: 72599 Revision: 21-Jan-08 www.vishay.com 15 Legal Disclaimer Notice www.vishay.com Vishay Disclaimer  ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any product. Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special, consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose, non-infringement and merchantability. Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular product with the properties described in the product specification is suitable for use in a particular application. Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed therein. Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining applications or for any other application in which the failure of the Vishay product could result in personal injury or death. Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners. © 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED Revision: 08-Feb-17 1 Document Number: 91000