New Product Si7224DN Vishay Siliconix Dual N-Channel 30-V (D-S) MOSFET FEATURES PRODUCT SUMMARY VDS (V) Channel 1 RDS(on) (Ω) 30 Channel 2 30 ID (A) Qg (Typ.) a 0.035 at VGS = 10 V 6 0.042 at VGS = 4.5 V 6a 0.028 at VGS = 10 V 6a 0.035 at VGS = 4.5 V 6a • Halogen-free Option Available • TrenchFET® Power MOSFETs RoHS 4.5 nC COMPLIANT APPLICATIONS 5.5 nC • Notebook PC System Power • Low Current POL PowerPAK® 1212-8 D1 S1 3.30 mm D2 3.30 mm 1 G1 2 S2 3 G2 4 D1 8 G1 D1 G2 7 D2 6 D2 Bottom View 5 Ordering Information: Si7224DN-T1-E3 (Lead (Pb)-free) Si7224DN-T1-GE3 (Lead (Pb)-free and Halogen-free) S1 S2 N-Channel MOSFET N-Channel MOSFET ABSOLUTE MAXIMUM RATINGS TA = 25 °C, unless otherwise noted Parameter Symbol VDS VGS Drain-Source Voltage Gate-Source Voltage Continuous Drain Current (TJ = 150 °C) TC = 25 °C TC = 70 °C TA = 25 °C TA = 70 °C IDM Pulsed Drain Current Source Drain Current Diode Current Maximum Power Dissipation Operating Junction and Storage Temperature Range Soldering Recommendations (Peak Temperature)d, e ID TC = 25 °C TA = 25 °C TC = 25 °C TC = 70 °C TA = 25 °C TA = 70 °C IS PD Channel 1 30 ± 16 Channel 2 30 ± 20 6a 6a 6a 6a 6a, b, c 5.2b, c 25 6a 6a, b, c 5.9b, c 30 6a 1.7b, c 17.8 11.4 2.2b, c 23 14.8 2.5b, c 1.6b, c 2.6b, c 1.7b, c TJ, Tstg - 55 to 150 260 Unit V A W °C THERMAL RESISTANCE RATINGS Channel 1 Parameter Symbol RthJA RthJC Typ. Max. Channel 2 Typ. Max. Unit t ≤ 10 s 40 50 38 48 Maximum Junction-to-Ambientb, f °C/W Maximum Junction-to-Case (Drain) Steady State 5.6 7 4.3 5.4 Notes: a. Package limited. b. Surface Mounted on 1" x 1" FR4 board. c. t = 10 s. d. See Solder Profile (http://www.vishay.com/ppg?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 adequade 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 94 °C/W. Document Number: 69500 S-81549-Rev. B, 07-Jul-08 www.vishay.com 1 New Product Si7224DN Vishay Siliconix SPECIFICATIONS TJ = 25 °C, unless otherwise noted Parameter Symbol Test Conditions Min. Typ. Max. Unit Static Drain-Source Breakdown Voltage VDS Temperature Coefficient VGS(th) Temperature Coefficient Gate Threshold Voltage Gate-Body Leakage VDS VGS = 0 V, ID = 250 µA ΔVDS/TJ ID = 250 µA ΔVGS(th)/TJ VGS(th) IGSS ID = 250 µA VDS = VGS, ID = 250 µA Drain-Source On-State Resistanceb Forward Transconductanceb RDS(on) gfs Ch 1 V 37 Ch 2 32 Ch 1 -5 Ch 2 mV/°C -6 Ch 1 1 2.2 Ch 2 1.5 3 Ch 1 ± 100 Ch 2 ± 100 Ch 1 1 IDSS ID(on) 30 VDS = 0 V, VGS = ± 20 V VDS = 30 V, VGS = 0 V, TJ = 55 °C On-State Drain Currentb 30 Ch 2 VDS = 0 V, VGS = ± 16 V VDS = 30 V, VGS = 0 V Zero Gate Voltage Drain Current Ch 1 Ch 2 1 Ch 1 10 Ch 2 V nA µA 10 VDS ≥ 5 V, VGS = 10 V Ch 1 15 Ch 2 15 VGS = 10 V, ID = 6.5 A Ch 1 0.027 0.035 VGS = 10 V, ID = 7.4 A Ch 2 0.022 0.028 VGS = 4.5 V, ID = 5.9 A Ch 1 0.032 0.042 VGS = 4.5 V, ID = 6.6 A Ch 2 0.029 0.035 VDS = 15 V, ID = 6.5 A Ch 1 22 VDS = 15 V, ID = 7.4 A Ch 2 21 Ch 1 570 Ch 2 720 A Ω S Dynamica Input Capacitance Output Capacitance Reverse Transfer Capacitance Ciss Channel 1 VDS = 15 V, VGS = 0 V, f = 1 MHz Coss Crss Channel 2 VDS = 15 V, VGS = 0 V, f = 1 MHz VDS = 15 V, VGS = 10 V, ID = 6.5 A Total Gate Charge Gate-Source Charge Gate-Drain Charge Gate Resistance Qg VDS = 10 V, VGS = 10 V, ID = 7.4 A Rg 80 Ch 2 115 Ch 1 35 pF Ch 2 50 Ch 1 9.5 14.5 18 Ch 2 12 Ch 1 4.5 7 Channel 1 VDS = 10 V, VGS = 4.5 V, ID = 6.5 A Ch 2 5.5 8.5 Ch 1 1.5 Channel 2 VDS = 10 V, VGS = 4.5 V, ID = 7.4 A Ch 2 2.5 Ch 1 1.2 Qgs Qgd Ch 1 f = 1 MHz Ch 2 1.7 Ch 1 3.3 Ch 2 2.7 nC Ω Notes: a. Guaranteed by design, not subject to production testing. b. Pulse test; pulse width ≤ 300 µs, duty cycle ≤ 2 %. www.vishay.com 2 Document Number: 69500 S-81549-Rev. B, 07-Jul-08 New Product Si7224DN Vishay Siliconix SPECIFICATIONS TJ = 25 °C, unless otherwise noted Parameter Symbol Test Conditions Min. Typ. Max. Ch 1 12 20 Ch 2 20 30 Ch 1 12 20 Ch 2 12 20 Ch 1 12 20 Ch 2 12 20 Ch 1 12 20 Ch 2 10 15 Ch 1 5 10 Unit Dynamica 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 td(off) tf td(on) tr Channel 1 VDD = 15 V, RL = 2.9 Ω ID ≅ 5.2 A, VGEN = 4.5 V, Rg = 1 Ω Channel 2 VDD = 15 V, RL = 2.6 Ω ID ≅ 5.9 A, VGEN = 4.5 V, Rg = 1 Ω Channel 1 VDD = 15 V, RL = 2.9 Ω ID ≅ 5.2 A, VGEN = 10 V, Rg = 1 Ω tf Channel 2 VDD = 15 V, RL = 2.6 Ω ID ≅ 5.9 A, VGEN = 10 V, Rg = 1 Ω IS TC = 25 °C td(off) Ch 2 10 15 Ch 1 10 15 Ch 2 10 15 Ch 1 15 25 Ch 2 15 25 Ch 1 10 15 Ch 2 10 15 ns Drain-Source Body Diode Characteristics Continuous Source-Drain Diode Current Pulse Diode Forward Currenta Body Diode Voltage Body Diode Reverse Recovery Time ISM VSD Ch 1 6 Ch 2 6 Ch 1 25 Ch 2 30 IS = 5.2 A, VGS = 0 V Ch 1 0.8 1.2 IS = 5.9 A, VGS = 0 V Ch 2 0.8 1.2 Ch 1 15 30 Ch 2 20 40 Ch 1 10 20 Ch 2 12 20 trr Body Diode Reverse Recovery Charge Qrr Channel 1 IF = 5.2 A, dI/dt = 100 A/µs, TJ = 25 °C Reverse Recovery Fall Time ta Channel 2 IF = 5.9 A, dI/dt = 100 A/µs, TJ = 25 °C Reverse Recovery Rise Time tb A Ch 1 9 Ch 2 12 Ch 1 6 Ch 2 8 V ns nC ns Notes: a. Guaranteed by design, not subject to production testing. b. Pulse test; pulse width ≤ 300 µs, duty cycle ≤ 2 %. 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. Document Number: 69500 S-81549-Rev. B, 07-Jul-08 www.vishay.com 3 New Product Si7224DN Vishay Siliconix CHANNEL 1 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 10 25 9 VGS = 10 thru 4 V 8 I D - Drain Current (A) I D - Drain Current (A) 20 15 VGS = 3 V 10 7 TC = - 55 °C 6 5 4 TC = 125 °C 3 2 5 TC = 25 °C 1 0 0 0.0 0.4 0.8 1.2 1.6 0 2.0 1.5 2.0 VGS - Gate-to-Source Voltage (V) Output Characteristics Transfer Characteristics 2.5 3.0 25 30 800 0.036 VGS = 4.5 V Ciss C - Capacitance (pF) 600 0.032 VGS = 10 V 0.028 400 200 0.024 Coss 0.020 Crss 0 0 5 10 15 20 25 0 5 10 15 20 ID - Drain Current (A) VDS - Drain-to-Source Voltage (V) On-Resistance vs. Drain Current Capacitance 1.8 10 ID = 6.5 A ID = 6.5 A 1.6 8 RDS(on) - On-Resistance (Normalized) VGS - Gate-to-Source Voltage (V) 1.0 VDS - Drain-to-Source Voltage (V) 0.040 RDS(on) - On-Resistance (Ω) 0.5 VDS = 15 V 6 VDS = 24 V 4 2 1.4 VGS = 10 V, 4.5 V 1.2 1.0 0.8 0 0 2 4 6 Qg - Total Gate Charge (nC) Gate Charge www.vishay.com 4 8 10 0.6 - 50 - 25 0 25 50 75 100 125 150 TJ - Junction Temperature (°C) On-Resistance vs. Junction Temperature Document Number: 69500 S-81549-Rev. B, 07-Jul-08 New Product Si7224DN Vishay Siliconix CHANNEL 1 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 0.10 100 R DS(on) - On-Resistance (Ω) I S - Source Current (A) ID = 6.5 A TJ = 150 °C 10 TJ = 25 °C 0.08 0.06 125 °C 0.04 25 °C 0.02 1 0 0.2 0.4 0.6 0.8 1.0 1.2 0 1.4 2 4 6 8 10 VGS - Gate-to-Source Voltage (V) VSD - Source-to-Drain Voltage (V) On-Resistance vs. Gate-to-Source Voltage Source-Drain Diode Forward Voltage 30 2.2 25 2.0 ID = 250 µA 20 Power (W) VGS(th) (V) 1.8 1.6 15 1.4 10 1.2 5 1.0 - 50 - 25 0 25 50 75 100 125 0 0.001 150 0.01 TJ - Temperature (°C) 0.1 1 10 100 1000 Time (s) Single Pulse Power Threshold Voltage 100 Limited by RDS(on)* I D - Drain Current (A) 10 100 µs 1 ms 1 10 ms 0.1 100 ms 1s 10 s TA = 25 °C Single Pulse DC BVDSS Limited 0.01 0.1 1 * VGS 10 100 VDS - Drain-to-Source Voltage (V) minimum VGS at which RDS(on) is specified Safe Operating Area, Junction-to-Ambient Document Number: 69500 S-81549-Rev. B, 07-Jul-08 www.vishay.com 5 New Product Si7224DN Vishay Siliconix CHANNEL 1 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 20 20 16 Power Dissipation (W) I D - Drain Current (A) 15 10 Package Limited 5 12 8 4 0 0 0 25 50 75 100 125 150 25 50 75 100 TC - Case Temperature (°C) TC - Case Temperature (°C) Current Derating* Power Derating 125 150 * 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. www.vishay.com 6 Document Number: 69500 S-81549-Rev. B, 07-Jul-08 New Product Si7224DN Vishay Siliconix CHANNEL 1 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted Normalized Effective Transient Thermal Impedance 1 Duty Cycle = 0.5 0.2 Notes: 0.1 0.1 PDM t1 0.05 t2 1. Duty Cycle, D = 0.02 t1 t2 2. Per Unit Base = RthJA = 75 °C/W 3. TJM - TA = PDMZthJA(t) Single Pulse 4. Surface Mounted 0.01 10-4 10-3 10-2 10-1 1 10 100 1000 Square Wave Pulse Duration (s) Normalized Thermal Transient Impedance, Junction-to-Ambient 1 Normalized Effective Transient Thermal Impedance Duty Cycle = 0.5 0.2 0.1 0.1 0.05 0.02 Single Pulse 0.01 10-4 10-3 10-2 10-1 1 Square Wave Pulse Duration (s) Normalized Thermal Transient Impedance, Junction-to-Case Document Number: 69500 S-81549-Rev. B, 07-Jul-08 www.vishay.com 7 New Product Si7224DN Vishay Siliconix CHANNEL 2 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 30 10 VGS = 10 thru 5 V 8 I D - Drain Current (A) I D - Drain Current (A) 25 VGS = 4 V 20 15 10 6 TC = 125 °C 4 TC = 25 °C 2 5 VGS = 3 V 0 TC = - 55 °C 0 0 0.5 1.0 1.5 2.0 2.5 0 3.0 0.5 1.0 VDS - Drain-to-Source Voltage (V) 1.5 2.0 2.5 3.0 3.5 4.0 VGS - Gate-to-Source Voltage (V) Output Characteristics Transfer Characteristics 1000 0.050 800 Ciss 0.040 C - Capacitance (pF) R DS(on) - On-Resistance (Ω) 0.045 0.035 VGS = 4.5 V 0.030 0.025 VGS = 10 V 600 400 0.020 Coss 200 0.015 Crss 0 0.010 0 5 10 15 20 25 30 0 5 10 20 25 30 VDS - Drain-to-Source Voltage (V) ID - Drain Current (A) On-Resistance vs. Drain Current Capacitance 1.8 10 ID = 7.4 A ID = 7.4 A 1.6 8 VDS = 15 V 6 VDS = 24 V 4 2 1.4 (Normalized) R DS(on) - On-Resistance VGS - Gate-to-Source Voltage (V) 15 VGS = 10 V 1.2 1.0 0.8 0 0 3 6 9 Qg - Total Gate Charge (nC) Gate Charge www.vishay.com 8 12 0.6 - 50 - 25 0 25 50 75 100 125 150 TJ - Junction Temperature (°C) On-Resistance vs. Junction Temperature Document Number: 69500 S-81549-Rev. B, 07-Jul-08 New Product Si7224DN Vishay Siliconix CHANNEL 2 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 0.06 100 R DS(on) - On-Resistance (Ω) I S - Source Current (A) ID = 7.4 A TJ = 150 °C 10 TJ = 25 °C 0.05 0.04 125 °C 0.03 25 °C 0.02 0.01 1 0 0.2 0.4 0.6 0.8 1.0 2 1.2 4 6 8 10 VGS - Gate-to-Source Voltage (V) VSD - Source-to-Drain Voltage (V) On-Resistance vs. Gate-to-Source Source-Drain Diode Forward Voltage 2.6 30 2.4 ID = 250 µA 25 2.2 Power (W) V GS(th) (V) 20 2.0 1.8 15 10 1.6 5 1.4 1.2 - 50 - 25 0 25 50 75 100 125 0 0.001 150 0.01 0.1 1 10 TJ - Temperature (°C) Time (s) Threshold Voltage Single Pulse Power 100 1000 100 Limited by R DS(on)* 100 µs I D - Drain Current (A) 10 1 ms 1 10 ms 0.1 100 ms 1s 10 s TA = 25 °C Single Pulse DC BVDSS Limited 0.01 0.1 * VGS 1 10 100 VDS - Drain-to-Source Voltage (V) minimum VGS at which RDS(on) is specified Safe Operating Area, Junction-to-Ambient Document Number: 69500 S-81549-Rev. B, 07-Jul-08 www.vishay.com 9 New Product Si7224DN Vishay Siliconix 25 25 20 20 Power Dissipation (W) I D - Drain Current (A) CHANNEL 2 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 15 10 Package Limited 5 15 10 5 0 0 0 25 50 75 100 125 150 25 50 75 100 TC - Case Temperature (°C) TC - Case Temperature (°C) Current Derating* Power Derating 125 150 * 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. www.vishay.com 10 Document Number: 69500 S-81549-Rev. B, 07-Jul-08 New Product Si7224DN Vishay Siliconix CHANNEL 2 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted 2 Normalized Effective Transient Thermal Impedance 1 Duty Cycle = 0.5 0.2 Notes: 0.1 0.1 PDM 0.05 t1 t2 1. Duty Cycle, D = 0.02 t1 t2 2. Per Unit Base = R thJA = 77 °C/W 3. T JM - T A = PDM ZthJA(t) Single Pulse 4. Surface Mounted 0.01 10-4 10-3 10-2 10-1 1 10 100 600 Square Wave Pulse Duration (s) Normalized Thermal Transient Impedance, Junction-to-Ambient 2 Normalized Effective Transient Thermal Impedance 1 Duty Cycle = 0.5 0.2 0.1 0.1 0.05 0.02 Single Pulse 0.01 10-4 10-3 10-2 10-1 1 Square Wave Pulse Duration (s) 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 http://www.vishay.com/ppg?69500. Document Number: 69500 S-81549-Rev. B, 07-Jul-08 www.vishay.com 11 Package Information www.vishay.com Vishay Siliconix D4 PowerPAK® 1212-8, (Single / Dual) W H E2 E4 L K M θ e 1 Z D5 D D2 2 2 D1 8 1 5 4 θ 4 b 3 L1 E3 A1 Backside view of single pad H 2 E1 E Detail Z L K E2 E4 D2 D3(2x) D4 c A H 1 D1 2 K1 Notes 1. Inch will govern 2 Dimensions exclusive of mold gate burrs 3. Dimensions exclusive of mold flash and cutting burrs D2 3 4 b θ D5 θ E3 Backside view of dual pad DIM. MILLIMETERS INCHES MIN. NOM. MAX. MIN. NOM. MAX. A 0.97 1.04 1.12 0.038 0.041 0.044 A1 0.00 - 0.05 0.000 - 0.002 b 0.23 0.30 0.41 0.009 0.012 0.016 c 0.23 0.28 0.33 0.009 0.011 0.013 D 3.20 3.0 3.40 0.126 0.130 0.134 D1 2.95 3.05 3.15 0.116 0.120 0.124 D2 1.98 2.11 2.24 0.078 0.083 0.088 D3 0.48 - 0.89 0.019 - 0.035 D4 0.47 typ. D5 2.3 typ. 0.0185 typ 0.090 typ E 3.20 3.30 3.40 0.126 0.130 0.134 E1 2.95 3.05 3.15 0.116 0.120 0.124 E2 1.47 1.60 1.73 0.058 0.063 0.068 E3 1.75 1.85 1.98 0.069 0.073 0.078 E4 0.034 typ. 0.013 typ. e 0.65 BSC 0.026 BSC K 0.86 typ. K1 0.35 - 0.034 typ. - 0.014 - - H 0.30 0.41 0.51 0.012 0.016 0.020 L 0.30 0.43 0.56 0.012 0.017 0.022 L1 0.06 0.13 0.20 0.002 0.005 0.008 0° - 12° 0° - 12° W 0.15 0.25 0.36 0.006 0.010 0.014 M 0.125 typ. 0.005 typ. ECN: T16-0287-Rev. L, 06-Jun-16 DWG: 5882 Revison: 06-Jun-16 Document Number: 71656 1 For technical questions, contact: [email protected] 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 AN822 Vishay Siliconix PowerPAK® 1212 Mounting and Thermal Considerations Johnson Zhao MOSFETs for switching applications are now available with die on resistances around 1 mΩ 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. The PowerPAK 1212-8 provides ultra-low thermal impedance in a small package that is ideal for space-constrained applications. In this application note, the PowerPAK 1212-8’s construction is described. Following this, mounting information is presented. Finally, thermal and electrical performance is discussed. THE PowerPAK PACKAGE The PowerPAK 1212-8 package (Figure 1) is a derivative of PowerPAK SO-8. It utilizes the same packaging technology, maximizing the die area. The bottom of the die attach pad is exposed to provide a direct, low resistance thermal path to the substrate the device is mounted on. The PowerPAK 1212-8 thus translates the benefits of the PowerPAK SO-8 into a smaller package, with the same level of thermal performance. (Please refer to application note “PowerPAK SO-8 Mounting and Thermal Considerations.”) The PowerPAK 1212-8 has a footprint area comparable to TSOP-6. It is over 40 % smaller than standard TSSOP-8. Its die capacity is more than twice the size of the standard TSOP-6’s. It has thermal performance an order of magnitude better than the SO-8, and 20 times better than TSSOP-8. Its thermal performance is better than all current SMT packages in the market. It will take the advantage of any PC board heat sink capability. Bringing the junction temperature down also increases the die efficiency by around 20 % compared with TSSOP-8. For applications where bigger packages are typically required solely for thermal consideration, the PowerPAK 1212-8 is a good option. Both the single and dual PowerPAK 1212-8 utilize the same pin-outs as the single and dual PowerPAK SO-8. The low 1.05 mm PowerPAK height profile makes both versions an excellent choice for applications with space constraints. PowerPAK 1212 SINGLE MOUNTING To take the advantage of the single PowerPAK 1212-8’s thermal performance see Application Note 826, Recommended Minimum Pad Patterns With Outline Drawing Access for Vishay Siliconix MOSFETs. Click on the PowerPAK 1212-8 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. 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-toambient thermal resistance. Under specific conditions of board configuration, copper weight, and layer stack, experiments have found that adding copper beyond an area of about 0.3 to 0.5 in2 of will yield little improvement in thermal performance. Figure 1. PowerPAK 1212 Devices Document Number 71681 03-Mar-06 www.vishay.com 1 AN822 Vishay Siliconix PowerPAK 1212 DUAL To take the advantage of the dual PowerPAK 1212-8’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 10 mils. This matches the spacing of the two drain pads on the PowerPAK 1212-8 dual package. 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-toambient thermal resistance. Under specific conditions of board configuration, copper weight, and layer stack, experiments have found that adding copper beyond an area of about 0.3 to 0.5 in2 of will yield little improvement in thermal performance. ture profile used, and the temperatures and time duration, are shown in Figures 2 and 3. For the lead (Pb)-free solder profile, see http://www.vishay.com/ doc?73257. REFLOW SOLDERING Vishay Siliconix surface-mount packages meet solder reflow reliability requirements. Devices are subjected to solder reflow as a preconditioning test and are then reliability-tested using temperature cycle, bias humidity, HAST, or pressure pot. The solder reflow tempera- Ramp-Up Rate + 6 °C /Second Maximum Temperature at 155 ± 15 °C 120 Seconds Maximum Temperature Above 180 °C 70 - 180 Seconds Maximum Temperature 240 + 5/- 0 °C Time at Maximum Temperature 20 - 40 Seconds Ramp-Down Rate + 6 °C/Second Maximum Figure 2. Solder Reflow Temperature Profile 10 s (max) 210 - 220 °C 3 ° C/s (max) 4 ° C/s (max) 183 °C 140 - 170 °C 50 s (max) 3° C/s (max) 60 s (min) Pre-Heating Zone Reflow Zone Maximum peak temperature at 240 °C is allowed. Figure 3. Solder Reflow Temperatures and Time Durations www.vishay.com 2 Document Number 71681 03-Mar-06 AN822 Vishay Siliconix TABLE 1: EQIVALENT STEADY STATE PERFORMANCE Package SO-8 TSSOP-8 TSOP-8 PPAK 1212 PPAK SO-8 Configuration Single Dual Single Dual Single Dual Single Dual Single Dual Thermal Resiatance RthJC(C/W) 20 40 52 83 40 90 2.4 5.5 1.8 5.5 PowerPAK 1212 Standard SO-8 49.8 °C 2.4 °C/W Standard TSSOP-8 85 °C 20 °C/W TSOP-6 149 °C 52 °C/W 125 °C 40 °C/W PC Board at 45 °C Figure 4. Temperature of Devices on a PC Board THERMAL PERFORMANCE Introduction Spreading Copper A basic measure of a device’s thermal performance is the junction-to-case thermal resistance, Rθjc, or the junction to- foot thermal resistance, Rθjf. 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 PowerPAK 1212-8, PowerPAK SO-8, standard TSSOP-8 and SO-8 equivalent steady state performance. By minimizing the junction-to-foot thermal resistance, the MOSFET die temperature is very close to the temperature of the PC board. Consider four devices mounted on a PC board with a board temperature of 45 °C (Figure 4). Suppose each device is dissipating 2 W. Using the junction-to-foot thermal resistance characteristics of the PowerPAK 1212-8 and the other SMT packages, die temperatures are determined to be 49.8 °C for the PowerPAK 1212-8, 85 °C for the standard SO-8, 149 °C for standard TSSOP-8, and 125 °C for TSOP-6. This is a 4.8 °C rise above the board temperature for the PowerPAK 1212-8, and over 40 °C for other SMT packages. A 4.8 °C rise has minimal effect on rDS(ON) whereas a rise of over 40 °C will cause an increase in rDS(ON) as high as 20 %. Designers 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 5 and Figure 6 show the thermal resistance of a PowerPAK 1212-8 single and dual devices mounted on a 2-in. x 2-in., four-layer FR-4 PC boards. 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 0.2 to 0.3 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. Document Number 71681 03-Mar-06 www.vishay.com 3 AN822 Vishay Siliconix 130 105 Spreading Copper (sq. in.) Spreading Copper (sq. in.) 120 95 110 100 RthJ A (°C/W) RthJA (°C/W) 85 75 65 90 80 50 % 100 % 70 100 % 55 0% 60 50 % 0% 50 45 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 Figure 5. Spreading Copper - Si7401DN Figure 6. Spreading Copper - Junction-to-Ambient Performance CONCLUSIONS As a derivative of the PowerPAK SO-8, the PowerPAK 1212-8 uses the same packaging technology and has been shown to have the same level of thermal performance while having a footprint that is more than 40 % smaller than the standard TSSOP-8. Recommended PowerPAK 1212-8 land patterns are provided to aid in PC board layout for designs using this new package. The PowerPAK 1212-8 combines small size with attractive thermal characteristics. By minimizing the thermal rise above the board temperature, PowerPAK simplifies thermal design considerations, allows the device to run cooler, keeps rDS(ON) low, and permits the device to handle more current than a same- or larger-size MOSFET die in the standard TSSOP-8 or SO-8 packages. www.vishay.com 4 Document Number 71681 03-Mar-06 Application Note 826 Vishay Siliconix RECOMMENDED MINIMUM PADS FOR PowerPAK® 1212-8 Dual 0.152 (3.860) 0.152 (3.860) 0.039 0.039 (0.990) (0.990) 0.068 0.068 (1.725) (1.725) 0.010 (0.255) 0.016 (0.405) 0.016 (0.405) 0.094 (2.390) 0.094 (2.390) 0.010 (0.225) (2.235) 0.088 0.039 (0.990) 0.039 (0.990) 0.026 (0.660) 0.026 (0.660) 0.030 (0.760) 0.025 (0.635) 0.025 0.030 (0.635) (0.760) Recommended Minimum PADs for PowerPAK 1212-8 Dual Dimensions in Inches/(mm) Recommended Minimum Pads Dimensions in Inches/(mm) Return to Index APPLICATION NOTE Return to Index www.vishay.com 1 Document Number: 72598 Revision: 14-Apr-08 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. 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