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| MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MRF1518/D The RF MOSFET Line RF Power Field Effect Transistor N-Channel Enhancement-Mode Lateral MOSFET The MRF1518T1 is designed for broadband commercial and industrial applications with frequencies to 520 MHz. The high gain and broadband performance of this device make it ideal for large-signal, common source amplifier applications in 12.5 volt mobile FM equipment. * Specified Performance @ 520 MHz, 12.5 Volts Output Power -- 8 Watts D Power Gain -- 11 dB Efficiency -- 55% * Capable of Handling 20:1 VSWR, @ 15.5 Vdc, 520 MHz, 2 dB Overdrive * Excellent Thermal Stability * Characterized with Series Equivalent Large-Signal G Impedance Parameters * RF Power Plastic Surface Mount Package * Broadband UHF/VHF Demonstration Amplifier S Information Available Upon Request * Available in Tape and Reel. T1 Suffix = 1,000 Units per 12 mm, 7 Inch Reel. MRF1518T1 520 MHz, 8 W, 12.5 V LATERAL N-CHANNEL BROADBAND RF POWER MOSFET CASE 466-02, STYLE 1 (PLD-1.5) PLASTIC MAXIMUM RATINGS Rating Drain-Source Voltage Gate-Source Voltage Drain Current -- Continuous Total Device Dissipation @ TC = 25C (1) Derate above 25C Storage Temperature Range Operating Junction Temperature Symbol VDSS VGS ID PD Tstg TJ Value 40 20 4 62.5 0.50 -65 to +150 150 Unit Vdc Vdc Adc Watts W/C C C THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Case (1) Calculated based on the formula PD = TJ - TC RJC Symbol RJC Max 2 Unit C/W NOTE - CAUTION - MOS devices are susceptible to damage from electrostatic charge. Reasonable precautions in handling and packaging MOS devices should be observed. REV 3 MOTOROLA RF Motorola, Inc. 2002 DEVICE DATA MRF1518T1 1 ELECTRICAL CHARACTERISTICS (TC = 25C unless otherwise noted) Characteristic OFF CHARACTERISTICS Zero Gate Voltage Drain Current (VDS = 40 Vdc, VGS = 0 Vdc) Gate-Source Leakage Current (VGS = 10 Vdc, VDS = 0 Vdc) ON CHARACTERISTICS Gate Threshold Voltage (VDS = 12.5 Vdc, ID = 100 A) Drain-Source On-Voltage (VGS = 10 Vdc, ID = 1 Adc) DYNAMIC CHARACTERISTICS Input Capacitance (VDS = 12.5 Vdc, VGS = 0, f = 1 MHz) Output Capacitance (VDS = 12.5 Vdc, VGS = 0, f = 1 MHz) Reverse Transfer Capacitance (VDS = 12.5 Vdc, VGS = 0, f = 1 MHz) FUNCTIONAL TESTS (In Motorola Test Fixture) Common-Source Amplifier Power Gain (VDD = 12.5 Vdc, Pout = 8 Watts, IDQ = 150 mA, f = 520 MHz) Drain Efficiency (VDD = 12.5 Vdc, Pout = 8 Watts, IDQ = 150 mA, f = 520 MHz) Gps 10 50 11 55 -- -- dB % Ciss Coss Crss -- -- -- 66 33 4.5 -- -- -- pF pF pF VGS(th) VDS(on) 1.0 -- 1.6 0.4 2.1 -- Vdc Vdc IDSS IGSS -- -- -- -- 1 1 Adc Adc Symbol Min Typ Max Unit MRF1518T1 2 MOTOROLA RF DEVICE DATA VGG C8 C7 + B2 C6 R4 B1 R3 C16 L1 Z6 DUT C9 C10 C11 Z7 Z8 Z9 Z10 C12 N2 C15 C14 + C13 VDD R2 N1 C1 C2 C3 C4 R1 Z1 Z2 Z3 Z4 Z5 C5 RF OUTPUT RF INPUT B1, B2 C1, C12 C2, C3, C10, C11 C4 C5, C16 C6, C13 C7, C14 C8, C15 C9 L1 N1, N2 R1 R2 R3 Short Ferrite Beads, Fair Rite Products (2743021446) 240 pF, 100 mil Chip Capacitors 0 to 20 pF Trimmer Capacitors 82 pF, 100 mil Chip Capacitor 120 pF, 100 mil Chip Capacitors 10 F, 50 V Electrolytic Capacitors 1,200 pF, 100 mil Chip Capacitors 0.1 mF, 100 mil Chip Capacitors 30 pF, 100 mil Chip Capacitor 55.5 nH, 5 Turn, Coilcraft Type N Flange Mounts 15 Chip Resistor (0805) 51 , 1/2 W Resistor 10 Chip Resistor (0805) R4 Z1 Z2 Z3 Z4 Z5, Z6 Z7 Z8 Z9 Z10 Board 33 k, 1/8 W Resistor 0.451 x 0.080 Microstrip 1.005 x 0.080 Microstrip 0.020 x 0.080 Microstrip 0.155 x 0.080 Microstrip 0.260 x 0.223 Microstrip 0.065 x 0.080 Microstrip 0.266 x 0.080 Microstrip 1.113 x 0.080 Microstrip 0.433 x 0.080 Microstrip Glass Teflon, 31 mils, 2 oz. Copper Figure 1. 450 - 520 MHz Broadband Test Circuit TYPICAL CHARACTERISTICS, 450 - 520 MHz 12 Pout , OUTPUT POWER (WATTS) 10 8 6 520 MHz 4 2 0 VDD = 12.5 Vdc 0 0.1 0.3 0.2 0.4 Pin, INPUT POWER (WATTS) 0.5 0.6 470 MHz 500 MHz 0 IRL, INPUT RETURN LOSS (dB) VDD = 12.5 Vdc 450 MHz -5 470 MHz 450 MHz -15 520 MHz -20 500 MHz -10 0 1 2 4 5 6 7 8 3 Pout, OUTPUT POWER (WATTS) 9 10 11 Figure 2. Output Power versus Input Power Figure 3. Input Return Loss versus Output Power MOTOROLA RF DEVICE DATA MRF1518T1 3 TYPICAL CHARACTERISTICS, 450 - 520 MHz 17 15 Eff, DRAIN EFFICIENCY (%) 13 GAIN (dB) 11 9 7 5 0 1 2 520 MHz 500 MHz 450 MHz 470 MHz 80 70 60 50 40 30 20 10 11 0 0 1 2 520 MHz 500 MHz 450 MHz 470 MHz VDD = 12.5 Vdc VDD = 12.5 Vdc 4 5 6 7 8 3 Pout, OUTPUT POWER (WATTS) 9 10 3 4 5 6 7 8 9 Pout, OUTPUT POWER (WATTS) 10 11 12 Figure 4. Gain versus Output Power Figure 5. Drain Efficiency versus Output Power 12 Pout , OUTPUT POWER (WATTS) 10 470 MHz 8 450 MHz 520 MHz 70 65 Eff, DRAIN EFFICIENCY (%) 60 55 50 45 40 35 1000 30 0 200 VDD = 12.5 Vdc Pin = 26.2 dBm 400 600 IDQ, BIASING CURRENT (mA) 800 1000 470 MHz 450 MHz 500 MHz 520 MHz 6 500 MHz 4 2 0 0 200 VDD = 12.5 Vdc Pin = 26.2 dBm 400 600 IDQ, BIASING CURRENT (mA) 800 Figure 6. Output Power versus Biasing Current Figure 7. Drain Efficiency versus Biasing Current 12 Pout , OUTPUT POWER (WATTS) 11 10 9 8 7 6 5 4 3 2 500 MHz 520 MHz 470 MHz 80 450 MHz Eff, DRAIN EFFICIENCY (%) 75 70 65 60 55 50 45 40 35 30 IDQ = 150 mA Pin = 26.2 dBm 8 9 10 11 12 13 14 15 16 520 MHz 500 MHz 450 MHz 470 MHz IDQ = 150 mA Pin = 26.2 dBm 8 9 10 11 12 13 14 15 16 VDD, SUPPLY VOLTAGE (VOLTS) VDD, SUPPLY VOLTAGE (VOLTS) Figure 8. Output Power versus Supply Voltage Figure 9. Drain Efficiency versus Supply Voltage MRF1518T1 4 MOTOROLA RF DEVICE DATA VGG C10 C9 + B2 C8 R4 B1 R3 C18 L1 Z7 DUT C11 C12 C13 Z8 Z9 Z10 Z11 C14 N2 C17 C16 + C15 VDD C7 R2 N1 C1 C2 C3 C4 C5 C6 R1 Z1 Z2 Z3 Z4 Z5 Z6 RF OUTPUT RF INPUT B1, B2 C1, C14 C2, C3, C4, C11, C12, C13 C5 C6 C7, C18 C8, C15 C9, C16 C10, C17 L1 N1, N2 R1 R2 Short Ferrite Beads, Fair Rite Products (2743021446) 240 pF, 100 mil Chip Capacitors 0 to 20 pF Trimmer Capacitors 30 pF, 100 mil Chip Capacitor 47 pF, 100 mil Chip Capacitor 120 pF, 100 mil Chip Capacitors 10 F, 50 V Electrolytic Capacitors 1,200 pF, 100 mil Chip Capacitors 0.1 F, 100 mil Chip Capacitors 55.5 nH, 5 Turn, Coilcraft Type N Flange Mounts 15 Chip Resistor (0805) 51 , 1/2 W Resistor R3 R4 Z1 Z2 Z3 Z4 Z5 Z6, Z7 Z8 Z9 Z10 Z11 Board 10 Chip Resistor (0805) 33 k, 1/8 W Resistor 0.476 x 0.080 Microstrip 0.724 x 0.080 Microstrip 0.348 x 0.080 Microstrip 0.048 x 0.080 Microstrip 0.175 x 0.080 Microstrip 0.260 x 0.223 Microstrip 0.239 x 0.080 Microstrip 0.286 x 0.080 Microstrip 0.806 x 0.080 Microstrip 0.553 x 0.080 Microstrip Glass Teflon, 31 mils, 2 oz. Copper Figure 10. 400 - 470 MHz Broadband Test Circuit TYPICAL CHARACTERISTICS, 400 - 470 MHz 12 440 MHz Pout , OUTPUT POWER (WATTS) 400 MHz 470 MHz IRL, INPUT RETURN LOSS (dB) 10 8 6 4 VDD = 12.5 Vdc 2 0 -5 440 MHz -10 400 MHz -15 470 MHz 0 0.1 0.3 0.5 0.2 0.4 Pin, INPUT POWER (WATTS) 0.6 0.7 -20 0 1 2 3 4 5 6 7 8 9 Pout, OUTPUT POWER (WATTS) 10 11 12 0 VDD = 12.5 Vdc Figure 11. Output Power versus Input Power Figure 12. Input Return Loss versus Output Power MOTOROLA RF DEVICE DATA MRF1518T1 5 TYPICAL CHARACTERISTICS, 400 - 470 MHz 17 15 13 GAIN (dB) 11 9 VDD = 12.5 Vdc 7 5 0 1 2 3 5 6 7 8 4 9 Pout, OUTPUT POWER (WATTS) 10 11 12 80 70 Eff, DRAIN EFFICIENCY (%) 440 MHz 400 MHz 60 50 40 30 20 10 0 0 1 2 VDD = 12.5 Vdc 470 MHz 440 MHz 400 MHz 470 MHz 5 6 7 8 9 3 4 Pout, OUTPUT POWER (WATTS) 10 11 12 Figure 13. Gain versus Output Power Figure 14. Drain Efficiency versus Output Power 12 Pout , OUTPUT POWER (WATTS) 10 8 6 4 2 0 0 200 440 MHz Eff, DRAIN EFFICIENCY (%) 400 MHz 470 MHz 70 65 60 55 50 45 40 35 1000 30 0 200 400 600 IDQ, BIASING CURRENT (mA) 800 1000 VDD = 12.5 Vdc Pin = 26.8 dBm 400 MHz 470 MHz 440 MHz VDD = 12.5 Vdc Pin = 26.8 dBm 400 600 IDQ, BIASING CURRENT (mA) 800 Figure 15. Output Power versus Biasing Current 12 Pout , OUTPUT POWER (WATTS) 11 10 9 8 7 6 5 4 3 2 470 MHz IDQ = 150 mA Pin = 26.8 dBm 8 9 10 11 12 13 14 15 16 Figure 16. Drain Efficiency versus Biasing Current 440 MHz 400 MHz Eff, DRAIN EFFICIENCY (%) 80 75 70 65 60 55 50 45 40 35 30 470 MHz 440 MHz 400 MHz IDQ = 150 mA Pin = 26.8 dBm 8 9 10 11 12 13 14 15 16 VDD, SUPPLY VOLTAGE (VOLTS) VDD, SUPPLY VOLTAGE (VOLTS) Figure 17. Output Power versus Supply Voltage Figure 18. Drain Efficiency versus Supply Voltage MRF1518T1 6 MOTOROLA RF DEVICE DATA VGG C9 C8 + B2 C7 R4 B1 R3 C17 L4 Z6 DUT C10 C12 C11 Z7 Z8 L2 L3 Z9 C16 C15 + C14 VDD R2 RF INPUT N1 C1 C2 R1 Z1 L1 C3 Z2 Z3 C4 Z4 Z5 C6 RF OUTPUT Z10 C13 N2 C5 B1, B2 C1, C13 C2, C4, C11 C3 C5 C6, C17 C7, C14 C8, C15 C9, C16 C10 C12 L1 L2 L3 Short Ferrite Beads, Fair Rite Products (2743021446) 330 pF, 100 mil Chip Capacitors 0 to 20 pF Trimmer Capacitors 12 pF, 100 mil Chip Capacitor 43 pF, 100 mil Chip Capacitor 75 pF, 100 mil Chip Capacitors 10 F, 50 V Electrolytic Capacitors 1,200 pF, 100 mil Chip Capacitors 0.1 F, 100 mil Chip Capacitors 75 pF, 100 mil Chip Capacitor 13 pF, 100 mil Chip Capacitor 26 nH, 4 Turn, Coilcraft 5 nH, 2 Turn, Coilcraft 33 nH, 5 Turn, Coilcraft L4 N1, N2 R1 R2 R3 R4 Z1 Z2 Z3 Z4 Z5, Z6 Z7 Z8 Z9 Z10 Board 55.5 nH, 5 Turn, Coilcraft Type N Flange Mounts 15 W Chip Resistor (0805) 56 W, 1/4 W Carbon Resistor 100 W Chip Resistor (0805) 33 kW, 1/8 W Carbon Resistor 0.115 x 0.080 Microstrip 0.255 x 0.080 Microstrip 1.037 x 0.080 Microstrip 0.192 x 0.080 Microstrip 0.260 x 0.223 Microstrip 0.125 x 0.080 Microstrip 0.962 x 0.080 Microstrip 0.305 x 0.080 Microstrip 0.155 x 0.080 Microstrip Glass Teflon, 31 mils, 2 oz. Copper Figure 19. 135 - 175 MHz Broadband Test Circuit TYPICAL CHARACTERISTICS, 135 - 175 MHz 12 Pout , OUTPUT POWER (WATTS) 10 8 6 4 2 0 VDD = 12.5 Vdc 0 0.1 0.2 0.3 Pin, INPUT POWER (WATTS) 0.4 0 VDD = 12.5 Vdc IRL, INPUT RETURN LOSS (dB) -5 155 MHz 135 MHz -15 175 MHz 155 MHz 175 MHz 135 MHz -10 -20 0 1 2 3 4 5 6 7 8 9 Pout, OUTPUT POWER (WATTS) 10 11 12 Figure 20. Output Power versus Input Power Figure 21. Input Return Loss versus Output Power MOTOROLA RF DEVICE DATA MRF1518T1 7 TYPICAL CHARACTERISTICS, 135 - 175 MHz 19 17 15 GAIN (dB) 13 11 9 7 135 MHz Eff, DRAIN EFFICIENCY (%) 175 MHz 155 MHz 80 70 60 50 40 30 20 10 12 0 0 1 2 VDD = 12.5 Vdc 155 MHz 135 MHz 175 MHz VDD = 12.5 Vdc 0 1 2 3 4 5 6 7 8 9 Pout, OUTPUT POWER (WATTS) 10 11 4 5 7 8 3 9 6 Pout, OUTPUT POWER (WATTS) 10 11 12 Figure 22. Gain versus Output Power Figure 23. Drain Efficiency versus Output Power 12 Pout , OUTPUT POWER (WATTS) 10 8 6 4 2 0 0 200 135 MHz 175 MHz 155 MHz Eff, DRAIN EFFICIENCY (%) 70 65 60 55 50 45 40 35 1000 30 0 200 VDD = 12.5 Vdc Pin = 24.5 dBm 600 400 IDQ, BIASING CURRENT (mA) 800 1000 155 MHz 135 MHz 175 MHz VDD = 12.5 Vdc Pin = 24.5 dBm 400 600 IDQ, BIASING CURRENT (mA) 800 Figure 24. Output Power versus Biasing Current 12 Pout , OUTPUT POWER (WATTS) 11 10 9 8 7 6 5 4 3 2 IDQ = 150 mA Pin = 24.5 dBm 8 9 10 11 12 13 14 15 16 155 MHz 175 MHz Figure 25. Drain Efficiency versus Biasing Current 135 MHz Eff, DRAIN EFFICIENCY (%) 80 75 70 65 60 55 50 45 40 35 30 IDQ = 150 mA Pin = 24.5 dBm 8 9 10 11 12 13 14 15 16 155 MHz 135 MHz 175 MHz VDD, SUPPLY VOLTAGE (VOLTS) VDD, SUPPLY VOLTAGE (VOLTS) Figure 26. Output Power versus Supply Voltage Figure 27. Drain Efficiency versus Supply Voltage MRF1518T1 8 MOTOROLA RF DEVICE DATA Zo = 10 Zin f = 450 MHz ZOL* 400 f = 470 MHz ZOL* 400 f = 470 MHz 135 f = 175 MHz ZOL* Zin f = 135 MHz 175 Zo = 10 520 520 Zin f = 450 MHz VDD = 12.5 V, IDQ = 150 mA, Pout = 8 W f MHz 450 470 500 520 Zin 4.9 +j2.85 4.85 +j3.71 4.63 +j3.84 3.52 +j3.92 ZOL* 6.42 +j3.23 4.59 +j3.61 4.72 +j3.12 3.81 +j3.27 VDD = 12.5 V, IDQ = 150 mA, Pout = 8 W f MHz 400 440 470 Zin 4.28 +j2.36 6.45 +j5.13 5.91 +j3.34 ZOL* 4.41 +j0.67 4.14 +j2.53 3.92 +j4.02 VDD = 12.5 V, IDQ = 150 mA, Pout = 8 W f MHz 135 155 175 Zin 18.31 -j0.76 17.72 +j1.85 18.06 +j5.23 ZOL* 8.97 +j2.62 9.69 +j2.81 7.94 +j1.14 Zin = Complex conjugate of source impedance with parallel 15 resistor and 82 pF capacitor in series with gate. (See Figure 1). Zin = Complex conjugate of source impedance with parallel 15 resistor and 47 pF capacitor in series with gate. (See Figure 10). Zin = Complex conjugate of source impedance with parallel 15 resistor and 43 pF capacitor in series with gate. (See Figure 19). ZOL* = Complex conjugate of the load impedance at given output power, voltage, frequency, and D > 50 %. ZOL* = Complex conjugate of the load impedance at given output power, voltage, frequency, and D > 50 %. ZOL* = Complex conjugate of the load impedance at given output power, voltage, frequency, and D > 50 %. Note: ZOL* was chosen based on tradeoffs between gain, drain efficiency, and device stability. Input Matching Network Device Under Test Output Matching Network Z in Z * OL Figure 28. Series Equivalent Input and Output Impedance MOTOROLA RF DEVICE DATA MRF1518T1 9 Table 1. Common Source Scattering Parameters (VDD = 12.5 Vdc) IDQ = 150 mA f MHz 50 100 200 300 400 500 600 700 800 900 1000 S11 |S11| 0.88 0.85 0.85 0.87 0.88 0.90 0.92 0.93 0.94 0.94 0.96 -148 -163 -170 -171 -172 -173 -173 -174 -175 -175 -176 |S21| 18.91 9.40 4.47 2.72 1.85 1.35 1.04 0.83 0.68 0.55 0.46 S21 99 86 73 64 56 52 47 44 39 36 30 |S12| 0.033 0.033 0.026 0.025 0.021 0.019 0.014 0.015 0.014 0.010 0.011 S12 11 -6 -17 -28 -21 -30 -26 -39 -31 -41 -38 |S22| 0.67 0.66 0.69 0.74 0.79 0.83 0.85 0.88 0.90 0.91 0.95 S22 -144 -158 -162 -163 -164 -165 -167 -168 -169 -170 -170 IDQ = 800 mA f MHz 50 100 200 300 400 500 600 700 800 900 1000 S11 |S11| 0.90 0.88 0.88 0.89 0.89 0.90 0.91 0.92 0.93 0.94 0.94 -159 -169 -174 -175 -175 -176 -176 -176 -176 -177 -177 |S21| 20.80 10.35 5.09 3.23 2.30 1.74 1.39 1.16 0.96 0.80 0.67 S21 97 88 79 73 67 63 59 55 50 46 41 |S12| 0.020 0.018 0.017 0.015 0.015 0.014 0.014 0.009 0.011 0.007 0.010 S12 14 1 -9 -18 -17 -22 -19 -23 -14 4 -15 |S22| 0.73 0.74 0.75 0.77 0.80 0.82 0.83 0.85 0.87 0.88 0.89 S22 -162 -169 -171 -171 -171 -170 -171 -171 -172 -173 -173 IDQ = 1.5 A f MHz 50 100 200 300 400 500 600 700 800 900 1000 S11 |S11| 0.91 0.89 0.88 0.89 0.89 0.90 0.92 0.92 0.93 0.94 0.94 -159 -169 -174 -175 -176 -176 -176 -176 -177 -177 -178 |S21| 20.18 10.05 4.93 3.14 2.24 1.70 1.36 1.13 0.94 0.78 0.65 S21 97 89 80 73 67 64 59 55 50 46 41 |S12| 0.015 0.016 0.015 0.014 0.014 0.014 0.010 0.013 0.008 0.013 0.007 S12 11 -5 -3 -14 -20 -22 -16 -10 -13 -26 8 |S22| 0.73 0.74 0.75 0.78 0.80 0.82 0.84 0.85 0.87 0.87 0.87 S22 -165 -171 -172 -172 -171 -170 -171 -171 -172 -173 -172 MRF1518T1 10 MOTOROLA RF DEVICE DATA APPLICATIONS INFORMATION DESIGN CONSIDERATIONS This device is a common-source, RF power, N-Channel enhancement mode, Lateral Metal-Oxide Semiconductor Field-Effect Transistor (MOSFET). Motorola Application Note AN211A, "FETs in Theory and Practice", is suggested reading for those not familiar with the construction and characteristics of FETs. This surface mount packaged device was designed primarily for VHF and UHF portable power amplifier applications. Manufacturability is improved by utilizing the tape and reel capability for fully automated pick and placement of parts. However, care should be taken in the design process to insure proper heat sinking of the device. The major advantages of Lateral RF power MOSFETs include high gain, simple bias systems, relative immunity from thermal runaway, and the ability to withstand severely mismatched loads without suffering damage. MOSFET CAPACITANCES The physical structure of a MOSFET results in capacitors between all three terminals. The metal oxide gate structure determines the capacitors from gate-to-drain (Cgd), and gate-to-source (Cgs). The PN junction formed during fabrication of the RF MOSFET results in a junction capacitance from drain-to-source (Cds). These capacitances are characterized as input (Ciss), output (Coss) and reverse transfer (Crss) capacitances on data sheets. The relationships between the inter-terminal capacitances and those given on data sheets are shown below. The Ciss can be specified in two ways: 1. Drain shorted to source and positive voltage at the gate. 2. Positive voltage of the drain in respect to source and zero volts at the gate. In the latter case, the numbers are lower. However, neither method represents the actual operating conditions in RF applications. drain-source voltage under these conditions is termed VDS(on). For MOSFETs, VDS(on) has a positive temperature coefficient at high temperatures because it contributes to the power dissipation within the device. BVDSS values for this device are higher than normally required for typical applications. Measurement of BVDSS is not recommended and may result in possible damage to the device. GATE CHARACTERISTICS The gate of the RF MOSFET is a polysilicon material, and is electrically isolated from the source by a layer of oxide. The DC input resistance is very high - on the order of 109 -- resulting in a leakage current of a few nanoamperes. Gate control is achieved by applying a positive voltage to the gate greater than the gate-to-source threshold voltage, VGS(th). Gate Voltage Rating -- Never exceed the gate voltage rating. Exceeding the rated VGS can result in permanent damage to the oxide layer in the gate region. Gate Termination -- The gates of these devices are essentially capacitors. Circuits that leave the gate open-circuited or floating should be avoided. These conditions can result in turn-on of the devices due to voltage build-up on the input capacitor due to leakage currents or pickup. Gate Protection -- These devices do not have an internal monolithic zener diode from gate-to-source. If gate protection is required, an external zener diode is recommended. Using a resistor to keep the gate-to-source impedance low also helps dampen transients and serves another important function. Voltage transients on the drain can be coupled to the gate through the parasitic gate-drain capacitance. If the gate-to-source impedance and the rate of voltage change on the drain are both high, then the signal coupled to the gate may be large enough to exceed the gate-threshold voltage and turn the device on. DC BIAS Since this device is an enhancement mode FET, drain current flows only when the gate is at a higher potential than the source. RF power FETs operate optimally with a quiescent drain current (IDQ), whose value is application dependent. This device was characterized at IDQ = 150 mA, which is the suggested value of bias current for typical applications. For special applications such as linear amplification, IDQ may have to be selected to optimize the critical parameters. The gate is a dc open circuit and draws no current. Therefore, the gate bias circuit may generally be just a simple resistive divider network. Some special applications may require a more elaborate bias system. GAIN CONTROL Power output of this device may be controlled to some degree with a low power dc control signal applied to the gate, thus facilitating applications such as manual gain control, ALC/AGC and modulation systems. This characteristic is very dependent on frequency and load line. Drain Cgd Gate Ciss = Cgd + Cgs Coss = Cgd + Cds Crss = Cgd Cds Cgs Source DRAIN CHARACTERISTICS One critical figure of merit for a FET is its static resistance in the full-on condition. This on-resistance, RDS(on), occurs in the linear region of the output characteristic and is specified at a specific gate-source voltage and drain current. The MOTOROLA RF DEVICE DATA MRF1518T1 11 MOUNTING The specified maximum thermal resistance of 2C/W assumes a majority of the 0.065 x 0.180 source contact on the back side of the package is in good contact with an appropriate heat sink. As with all RF power devices, the goal of the thermal design should be to minimize the temperature at the back side of the package. Refer to Motorola Application Note AN4005/D, "Thermal Management and Mounting Method for the PLD-1.5 RF Power Surface Mount Package," and Engineering Bulletin EB209/D, "Mounting Method for RF Power Leadless Surface Mount Transistor" for additional information. AMPLIFIER DESIGN Impedance matching networks similar to those used with bipolar transistors are suitable for this device. For examples see Motorola Application Note AN721, "Impedance Matching Networks Applied to RF Power Transistors." Large-signal impedances are provided, and will yield a good first pass approximation. Since RF power MOSFETs are triode devices, they are not unilateral. This coupled with the very high gain of this device yields a device capable of self oscillation. Stability may be achieved by techniques such as drain loading, input shunt resistive loading, or output to input feedback. The RF test fixture implements a parallel resistor and capacitor in series with the gate, and has a load line selected for a higher efficiency, lower gain, and more stable operating region. Two-port stability analysis with this device's S-parameters provides a useful tool for selection of loading or feedback circuitry to assure stable operation. See Motorola Application Note AN215A, "RF Small-Signal Design Using Two-Port Parameters" for a discussion of two port network theory and stability. MRF1518T1 12 MOTOROLA RF DEVICE DATA NOTES MOTOROLA RF DEVICE DATA MRF1518T1 13 NOTES MRF1518T1 14 MOTOROLA RF DEVICE DATA NOTES MOTOROLA RF DEVICE DATA MRF1518T1 15 PACKAGE DIMENSIONS 2 ZONE X AF 3 4 NK 1 D B Q E 0.89 (0.035) X 45 _ "5 _ STYLE 1: PIN 1. 2. 3. 4. DRAIN GATE SOURCE SOURCE Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. MOTOROLA and the logo are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. E Motorola, Inc. 2002. How to reach us: USA/EUROPE/Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1-303-675-2140 or 1-800-441-2447 JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center, 3-20-1, Minami-Azabu. Minato-ku, Tokyo 106-8573 Japan. 81-3-3440-3569 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. 852-26668334 Technical Information Center: 1-800-521-6274 HOME PAGE: http://www.motorola.com/semiconductors/ MRF1518T1 16 EEE EEE EEEE EEEE EEEE EEEE EEEE EEEE EEEE EEEE H G J L R C P 10_DRAFT U 0.146 3.71 S ZONE V 0.095 2.41 0.115 2.92 ZONE W 0.115 2.92 0.020 0.51 inches mm RESIN BLEED/FLASH ALLOWABLE SOLDER FOOTPRINT INCHES MIN MAX 0.255 0.265 0.225 0.235 0.065 0.072 0.130 0.150 0.021 0.026 0.026 0.044 0.050 0.070 0.045 0.063 0.160 0.180 0.273 0.285 0.245 0.255 0.230 0.240 0.000 0.008 0.055 0.063 0.200 0.210 0.006 0.012 0.006 0.012 0.000 0.021 0.000 0.010 0.000 0.010 MILLIMETERS MIN MAX 6.48 6.73 5.72 5.97 1.65 1.83 3.30 3.81 0.53 0.66 0.66 1.12 1.27 1.78 1.14 1.60 4.06 4.57 6.93 7.24 6.22 6.48 5.84 6.10 0.00 0.20 1.40 1.60 5.08 5.33 0.15 0.31 0.15 0.31 0.00 0.53 0.00 0.25 0.00 0.25 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH 3. RESIN BLEED/FLASH ALLOWABLE IN ZONE V, W, AND X. CASE 466-02 ISSUE B (PLD-1.5) DIM A B C D E F G H J K L N P Q R S U ZONE V ZONE W ZONE X MRF1518/D MOTOROLA RF DEVICE DATA |
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