IRLU7821PBF

Applications l High Frequency Synchronous Buck Converters for Computer Processor Power l High Frequency Isolated DC-DC Converters with Synchronous Rectification for Telecom and Industrial Use l Lead-Free Benefits l Very Low RDS(on) at 4.5V VGS l Ultra-Low Gate Impedance l Fully Characterized Avalanche Voltage and Current HEXFET Power MOSFET IRLR7821PbF IRLU7821PbF ® 10m: PD - 95091B VDSS RDS(on) max 30V Qg 10nC D-Pak I-Pak IRLR7821PbF IRLU7821PbF Absolute Maximum Ratings Parameter VDS VGS ID @ TC = 25°C ID @ TC = 100°C IDM PD @TC = 25°C PD @TC = 100°C TJ TSTG Drain-to-Source Voltage Gate-to-Source Voltage Continuous Drain Current, VGS @ 10V Continuous Drain Current, VGS @ 10V Pulsed Drain Current Max. 30 ± 20 65 47 Units V ™ f f A 260 75 37.5 0.50 -55 to + 175 W W/°C °C Maximum Power Dissipation Maximum Power Dissipation Linear Derating Factor Operating Junction and Storage Temperature Range Thermal Resistance Parameter RθJC RθJA RθJA Junction-to-Case Junction-to-Ambient (PCB Mount) Junction-to-Ambient Typ. Max. 2.0 50 110 Units °C/W gà ––– ––– ––– Notes  through … are on page 11 www.irf.com 1 10/02/06 IRLR/U7821PbF Static @ TJ = 25°C (unless otherwise specified) Parameter BVDSS ∆ΒVDSS/∆TJ RDS(on) VGS(th) ∆VGS(th) IDSS IGSS gfs Qg Qgs1 Qgs2 Qgd Qgodr Qsw Qoss td(on) tr td(off) tf Ciss Coss Crss Drain-to-Source Breakdown Voltage Breakdown Voltage Temp. Coefficient Static Drain-to-Source On-Resistance Gate Threshold Voltage Gate Threshold Voltage Coefficient Drain-to-Source Leakage Current Gate-to-Source Forward Leakage Gate-to-Source Reverse Leakage Forward Transconductance Total Gate Charge Pre-Vth Gate-to-Source Charge Post-Vth Gate-to-Source Charge Gate-to-Drain Charge Gate Charge Overdrive Switch Charge (Qgs2 + Qgd) Output Charge Turn-On Delay Time Rise Time Turn-Off Delay Time Fall Time Input Capacitance Output Capacitance Reverse Transfer Capacitance Min. Typ. Max. Units 30 ––– ––– ––– 1.0 ––– ––– ––– ––– ––– 46 ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– 23 7.5 9.5 ––– -5.3 ––– ––– ––– ––– ––– 10 2.0 1.2 2.5 4.3 3.7 8.5 11 4.2 10 3.2 1030 360 120 ––– ––– 10 12.5 ––– ––– 1.0 150 100 -100 ––– 14 ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– ––– pF VGS = 0V VDS = 15V ns nC nC VDS = 16V VGS = 4.5V ID = 12A S nA V mV/°C µA V Conditions VGS = 0V, ID = 250µA mV/°C Reference to 25°C, ID = 1mA mΩ VGS = 10V, ID = 15A VGS = 4.5V, ID = 12A f f VDS = VGS, ID = 250µA VDS = 24V, VGS = 0V VDS = 24V, VGS = 0V, TJ = 125°C VGS = 20V VGS = -20V VDS = 15V, ID = 12A See Fig. 16 VDS = 16V, VGS = 0V VDD = 15V, VGS = 4.5V ID = 12A Clamped Inductive Load f ƒ = 1.0MHz Avalanche Characteristics EAS IAR EAR Parameter Single Pulse Avalanche Energy Avalanche Current Ù dh Typ. ––– ––– ––– Max. 230 12 7.5 Units mJ A mJ Repetitive Avalanche Energy ™ ––– ––– ––– ––– ––– ––– ––– ––– 26 15 Diode Characteristics Parameter IS ISM VSD trr Qrr ton Continuous Source Current (Body Diode) Pulsed Source Current (Body Diode) Diode Forward Voltage Reverse Recovery Time Reverse Recovery Charge Forward Turn-On Time Min. Typ. Max. Units 65 f Conditions MOSFET symbol D A 260 1.0 38 23 V ns nC Ùh showing the integral reverse G S p-n junction diode. TJ = 25°C, IS = 12A, VGS = 0V TJ = 25°C, IF = 12A, VDD = 15V di/dt = 100A/µs f f Intrinsic turn-on time is negligible (turn-on is dominated by LS+LD) 2 www.irf.com IRLR/U7821PbF 10000 TOP VGS 10V 4.5V 3.7V 3.5V 3.3V 3.0V 2.7V 2.5V 1000 TOP VGS 10V 4.5V 3.7V 3.5V 3.3V 3.0V 2.7V 2.5V ID, Drain-to-Source Current (A) 1000 ID, Drain-to-Source Current (A) 100 BOTTOM 100 BOTTOM 10 10 2.5V 20µs PULSE WIDTH Tj = 175°C 1 0.1 1 10 100 1 2.5V 20µs PULSE WIDTH Tj = 25°C 0.1 1 10 100 0.1 VDS, Drain-to-Source Voltage (V) VDS, Drain-to-Source Voltage (V) Fig 1. Typical Output Characteristics Fig 2. Typical Output Characteristics 1000 2.0 I D = 65A 100 T = 175 J °C R DS(on) , Drain-to-Source On Resistance I D , Drain-to-Source Current (A) 1.5 (Normalized) 1.0 10 0.5 TJ = 25 °C V DS= 15V 20µs PULSE WIDTH 1 2.0 4.0 6.0 8.0 10.0 0.0 -60 -40 -20 0 20 40 60 80 V GS = 10V 100 120 140 160 180 V GS Gate-to-Source Voltage (V) , TJ, Junction Temperature (°C) Fig 3. Typical Transfer Characteristics Fig 4. Normalized On-Resistance Vs. Temperature www.irf.com 3 IRLR/U7821PbF 10000 VGS = 0V, f = 1 MHZ Ciss = C + C , C SHORTED gs gd ds Crss = C gd Coss = Cds + Cgd 6 VGS , Gate-to-Source Voltage (V) ID= 12A 5 4 3 2 1 0 VDS= 24V VDS= 16V C, Capacitance(pF) 1000 Ciss Coss Crss 100 10 1 10 100 0 2 4 6 8 10 12 VDS, Drain-to-Source Voltage (V) Q G Total Gate Charge (nC) Fig 5. Typical Capacitance Vs. Drain-to-Source Voltage Fig 6. Typical Gate Charge Vs. Gate-to-Source Voltage 1000 1000 OPERATION IN THIS AREA LIMITED BY R DS(on) 100 ID, Drain-to-Source Current (A) 100 100µsec 10 1msec 1 Tc = 25°C Tj = 175°C Single Pulse 0.1 1 10 VDS, Drain-to-Source Voltage (V) 10msec I SD , Reverse Drain Current (A) TJ = 175 ° C 10 1 T J= 25 ° C 0.1 0.0 0.5 1.0 V GS = 0 V 1.5 2.0 100 V SD ,Source-to-Drain Voltage (V) Fig 7. Typical Source-Drain Diode Forward Voltage Fig 8. Maximum Safe Operating Area 4 www.irf.com IRLR/U7821PbF 70 2.5 60 VGS(th) Gate threshold Voltage (V) LIMITED BY PACKAGE 2.0 50 I D , Drain Current (A) 40 ID = 250µA 1.5 30 20 1.0 10 0 25 50 75 100 125 150 175 0.5 -75 -50 -25 0 25 50 75 100 125 150 175 200 TC , Case Temperature ( °C) T J , Temperature ( °C ) Fig 9. Maximum Drain Current Vs. Case Temperature Fig 10. Threshold Voltage Vs. Temperature 10 (Z thJC ) 1 D = 0.50 0.20 Thermal Response 0.10 0.05 0.1 0.02 0.01 SINGLE PULSE (THERMAL RESPONSE) P DM t1 t2 Notes: 1. Duty factor D = 2. Peak T 0.01 0.00001 0.0001 0.001 0.01 t1/ t 2 +T C 1 J = P DM x Z thJC 0.1 t1, Rectangular Pulse Duration (sec) Fig 11. Maximum Effective Transient Thermal Impedance, Junction-to-Case www.irf.com 5 IRLR/U7821PbF 15V 1000 TOP VDS L DRIVER 800 BOTTOM ID 4.9A 8.5A 12A RG 20V VGS D.U.T IAS tp + V - DD EAS , Single Pulse Avalanche Energy (mJ) A 600 0.01Ω 400 Fig 12a. Unclamped Inductive Test Circuit V(BR)DSS tp 200 0 25 50 75 100 125 150 175 Starting Tj, Junction Temperature ( ° C) Fig 12c. Maximum Avalanche Energy Vs. Drain Current I AS VDS VGS RG Current Regulator Same Type as D.U.T. RD Fig 12b. Unclamped Inductive Waveforms D.U.T. + -V DD V GS Pulse Width ≤ 1 µs Duty Factor ≤ 0.1 % 50KΩ 12V .2µF .3µF Fig 14a. Switching Time Test Circuit D.U.T. + V - DS VDS 90% VGS 3mA IG ID 10% VGS td(on) tr t d(off) tf Current Sampling Resistors Fig 13. Gate Charge Test Circuit Fig 14b. Switching Time Waveforms 6 www.irf.com IRLR/U7821PbF D.U.T Driver Gate Drive + P.W. Period D= P.W. Period VGS=10V ƒ + Circuit Layout Considerations • Low Stray Inductance • Ground Plane • Low Leakage Inductance Current Transformer * D.U.T. ISD Waveform Reverse Recovery Current Body Diode Forward Current di/dt D.U.T. VDS Waveform Diode Recovery dv/dt ‚ - - „ +  RG • • • • dv/dt controlled by R G Driver same type as D.U.T. I SD controlled by Duty Factor "D" D.U.T. - Device Under Test V DD VDD + - Re-Applied Voltage Inductor Curent Body Diode Forward Drop Ripple ≤ 5% ISD * VGS = 5V for Logic Level Devices Fig 15. Peak Diode Recovery dv/dt Test Circuit for N-Channel HEXFET® Power MOSFETs Id Vds Vgs Vgs(th) Qgs1 Qgs2 Qgd Qgodr Fig 16. Gate Charge Waveform www.irf.com 7 IRLR/U7821PbF Power MOSFET Selection for Non-Isolated DC/DC Converters Control FET Special attention has been given to the power losses in the switching elements of the circuit - Q1 and Q2. Power losses in the high side switch Q1, also called the Control FET, are impacted by the Rds(on) of the MOSFET, but these conduction losses are only about one half of the total losses. Power losses in the control switch Q1 are given by; Synchronous FET The power loss equation for Q2 is approximated by; * Ploss = Pconduction + P + Poutput drive Ploss = Irms × Rds(on) + ( g × Vg × f ) Q ( 2 ) Ploss = Pconduction+ Pswitching+ Pdrive+ Poutput This can be expanded and approximated by; ⎛Q ⎞ + ⎜ oss × Vin × f + (Qrr × Vin × f ) ⎝2 ⎠ *dissipated primarily in Q1. Ploss = (Irms 2 × Rds(on ) ) ⎛ Qgd +⎜I × × Vin × ig ⎝ + (Qg × Vg × f ) + ⎛ Qoss × Vin × f ⎞ ⎝2 ⎠ ⎞⎛ Qgs 2 ⎞ f⎟ + ⎜ I × × Vin × f ⎟ ig ⎠⎝ ⎠ This simplified loss equation includes the terms Qgs2 and Qoss which are new to Power MOSFET data sheets. Qgs2 is a sub element of traditional gate-source charge that is included in all MOSFET data sheets. The importance of splitting this gate-source charge into two sub elements, Qgs1 and Qgs2, can be seen from Fig 16. Qgs2 indicates the charge that must be supplied by the gate driver between the time that the threshold voltage has been reached and the time the drain current rises to Idmax at which time the drain voltage begins to change. Minimizing Q gs2 is a critical factor in reducing switching losses in Q1. Qoss is the charge that must be supplied to the output capacitance of the MOSFET during every switching cycle. Figure A shows how Qoss is formed by the parallel combination of the voltage dependant (nonlinear) capacitance’s Cds and Cdg when multiplied by the power supply input buss voltage. For the synchronous MOSFET Q2, Rds(on) is an important characteristic; however, once again the importance of gate charge must not be overlooked since it impacts three critical areas. Under light load the MOSFET must still be turned on and off by the control IC so the gate drive losses become much more significant. Secondly, the output charge Qoss and reverse recovery charge Qrr both generate losses that are transfered to Q1 and increase the dissipation in that device. Thirdly, gate charge will impact the MOSFETs’ susceptibility to Cdv/dt turn on. The drain of Q2 is connected to the switching node of the converter and therefore sees transitions between ground and Vin. As Q1 turns on and off there is a rate of change of drain voltage dV/dt which is capacitively coupled to the gate of Q2 and can induce a voltage spike on the gate that is sufficient to turn the MOSFET on, resulting in shoot-through current . The ratio of Qgd/Qgs1 must be minimized to reduce the potential for Cdv/dt turn on. Figure A: Qoss Characteristic 8 www.irf.com IRLR/U7821PbF D-Pak (TO-252AA) Package Outline D-Pak (TO-252AA) Part Marking Information EXAMPL E: T HIS IS AN IRF R120 WIT H AS S EMBLY LOT CODE 1234 AS S EMB LED ON WW 16, 2001 IN T HE AS S EMBLY LINE "A" Note: "P" in as s embly line pos ition indicates "Lead-Free" INT ERNAT IONAL RECT IFIER LOGO AS S EMBL Y LOT CODE PART NUMBER IRFR120 12 116A 34 DAT E CODE YEAR 1 = 2001 WEEK 16 L INE A OR INT ERNAT IONAL RECT IF IER L OGO AS S EMBLY L OT CODE PART NUMBER IRF R120 12 34 DAT E CODE P = DES IGNAT ES LEAD-F REE PRODUCT (OPT IONAL) YEAR 1 = 2001 WEEK 16 A = AS S EMBL Y S IT E CODE www.irf.com 9 IRLR/U7821PbF Dimensions are shown in millimeters (inches) I-Pak (TO-251AA) Package Outline I-Pak (TO-251AA) Part Marking Information EXAMPLE: THIS IS AN IRFU120 WIT H AS SEMBLY LOT CODE 5678 AS S EMBLED ON WW 19, 2001 IN THE AS S EMBLY LINE "A" Note: "P" in ass embly line position indicates Lead-Free" INTERNATIONAL RECTIFIER LOGO AS S EMBLY LOT CODE PART NUMBER IRFU120 119A 56 78 DATE CODE YEAR 1 = 2001 WEEK 19 LINE A OR INTERNATIONAL RECTIFIER LOGO AS S EMBLY LOT CODE PART NUMBER IRFU120 56 78 DATE CODE P = DESIGNATES LEAD-FREE PRODUCT (OPTIONAL) YEAR 1 = 2001 WEEK 19 A = AS S EMBLY S ITE CODE 10 www.irf.com IRLR/U7821PbF D-Pak (TO-252AA) Tape & Reel Information Dimensions are shown in millimeters (inches) TR TRR TRL 16.3 ( .641 ) 15.7 ( .619 ) 16.3 ( .641 ) 15.7 ( .619 ) 12.1 ( .476 ) 11.9 ( .469 ) FEED DIRECTION 8.1 ( .318 ) 7.9 ( .312 ) FEED DIRECTION NOTES : 1. CONTROLLING DIMENSION : MILLIMETER. 2. ALL DIMENSIONS ARE SHOWN IN MILLIMETERS ( INCHES ). 3. OUTLINE CONFORMS TO EIA-481 & EIA-541. 13 INCH 16 mm NOTES : 1. OUTLINE CONFORMS TO EIA-481. Notes:  Repetitive rating; pulse width limited by max. junction temperature. ‚ Starting TJ = 25°C, L = 3.2mH RG = 25Ω, IAS = 12A. ƒ Pulse width ≤ 400µs; duty cycle ≤ 2%. „ Calculated continuous current based on maximum allowable junction temperature. Package limitation current is 30A. … When mounted on 1" square PCB (FR-4 or G-10 Material). For recommended footprint and soldering techniques refer to application note #AN-994. Data and specifications subject to change without notice. This product has been designed and qualified for the Industrial market. Qualification Standards can be found on IR’s Web site. IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information.10/2006 www.irf.com 11 Note: For the most current drawings please refer to the IR website at: http://www.irf.com/package/