TL2217-285 FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION SLVS066F – NOVEMBER 1991 – REVISED JULY 1999 D D D D D D D D D Fully Matches Parameters for SCSI Alternative 2 Active Termination Fixed 2.85-V Output ±1.5% Maximum Output Tolerance at TJ = 25°C 1-V Maximum Dropout Voltage 500-mA Output Current ±3% Absolute Output Variation Internal Overcurrent-Limiting Circuitry Internal Thermal-Overload Protection Internal Overvoltage Protection description The TL2217-285 is a low-dropout (1 V) fixedvoltage regulator specifically designed for small computer systems interface (SCSI) alternative 2 active signal termination. The TL2217-285 1-V maximum dropout ensures compatibility with existing SCSI systems, while providing a wide TERMPWR voltage range. At the same time, the ±1.5% initial tolerance on its 2.85-V output voltage ensures a tighter line-driver current tolerance, thereby increasing system noise margin. The fixed 2.85-V output voltage of TL2217-285 supports the SCSI alternative 2 termination standard, while reducing system power consumption. The 1-V maximum dropout voltage brings increased TERMPWR isolation, making the device ideal for battery-powered systems. The TL2217-285, with internal current limiting, overvoltage protection, ESD protection, and thermal protection, offers designers enhanced system protection and reliability. PW PACKAGE (TOP VIEW) HEAT SINK GND INPUT HEAT SINK 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 HEAT SINK GND OUTPUT HEAT SINK HEAT SINK – These pins have an internal resistive connection to ground and should be grounded or electrically isolated. KC PACKAGE† (TOP VIEW) OUTPUT GND INPUT GND KTP PACKAGE† (TOP VIEW) OUTPUT GND GND INPUT † The GND terminal is in electrical contact with the mounting base. When configured as a SCSI active terminator, the TL2217-285 low-dropout regulator eliminates the 220-Ω and 330-Ω resistors required for each transmission line with a passive termination scheme, reducing significantly the continuous system-power drain. When placed in series with 110-Ω resistors, the device matches the impedance level of the transmission cable and eliminates reflections. The TL2217-285 is characterized for operation over the virtual junction temperature range of 0°C to 125°C. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright 1999, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 TL2217-285 FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION SLVS066F – NOVEMBER 1991 – REVISED JULY 1999 AVAILABLE OPTIONS PACKAGED DEVICES CHIP FORM (Y) TJ PLASTIC POWER (KC) PLASTIC FLANGE MOUNT (KTP) SURFACE MOUNT (PW) 0°C to 125°C TL2217-285KC TL22I7-285KTP TL22I7-285PWR TL2217-285Y The KTP and PW packages are only available taped and reeled. Add the suffix R to the device type (e.g., TL2217–285KTPR). Chip forms are tested at 25°C. absolute maximum ratings over operating virtual junction temperature range (unless otherwise noted)† Continuous input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5 V Operating virtual junction temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 150°C Package thermal impedance, θJA (see Notes 1 and 2): KC package . . . . . . . . . . . . . . . . . . . . . . . . . . . 22°C/W KTP package . . . . . . . . . . . . . . . . . . . . . . . . . . 28°C/W PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . 83°C/W Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C † 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 under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability. Due to variations in individual device electrical characteristics and thermal resistance, the built-in thermal overload protection may be activated at power levels slightly above or below the rated dissipation. 2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace length of zero. recommended operating conditions Input voltage, VI Output current, IO Operating virtual junction temperature range, TJ 2 POST OFFICE BOX 655303 TL2217–285 • DALLAS, TEXAS 75265 MIN MAX 3.85 5.5 UNIT V 0 500 mA 0 125 °C TL2217-285 FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION SLVS066F – NOVEMBER 1991 – REVISED JULY 1999 electrical characteristics over recommended operating conditions, VI = 4.5 V, IO = 500 mA, TJ = 25°C (unless otherwise noted) TL2217-285 TEST CONDITIONS† PARAMETER Output voltage IO = 20 mA to 500 mA mA, VI = 3 3.85 85 V to 5.5 55V Input voltage regulation VI = 3.85 V to 5.5 V f = 120Hz, Vripple = 1 VPP Ripple rejection Output voltage regulation Output noise voltage TJ = 25°C TJ = 0°C to 125°C MIN TYP 2.81 2.85 2.765 MAX 2.89 2.935 5 15 –62 IO = 20 mA to 500 mA f = 10 Hz to 100 kHz 5 30 mV mV µV 500 1 IO = 0 IO = 27 mA, equivalent 1 line asserted V dB Dropout voltage Bias current UNIT 2 5 3 6 V mA IO = 500 mA, equivalent 18 lines asserted (8 bit) 26 49 † Pulse-testing techniques are used to maintain the virtual junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into account separately. All characteristics are measured with a 0.1-µF capacitor across the input and a 22-µF tantalum capacitor with equivalent series resistance of 1.5 Ω on the output. electrical characteristics over recommended operating conditions, VI = 4.5 V, IO = 500 mA, TJ = 25°C (unless otherwise noted) TEST CONDITIONS† PARAMETER Output voltage IO = 20 mA to 500 mA, VI = 3.85 V to 5.5 V VI = 3.85 V to 5.5 V Input voltage regulation Ripple rejection f = 120 Hz, Vripple = 1 VPP Output voltage regulation IO = 20 mA to 500 mA f = 10 Hz to 100 kHz Output noise voltage Dropout voltage Bias current IO = 500 mA IO = 0 TL2217-285Y TYP MAX 2.81 2.85 2.89 5 15 mV 30 mV –62 5 V dB µV 500 1 2 IO = 27 mA, equivalent 1 line asserted IO = 500 mA, equivalent 18 lines asserted (8 bit) UNIT MIN V 5 3 6 26 49 mA † Pulse-testing techniques are used to maintain the virtual junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into account separately. All characteristics are measured with a 0.1-µF capacitor across the input and a 22-µF tantalum capacitor with equivalent series resistance of 1.5 Ω on the output. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 TL2217-285 FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION SLVS066F – NOVEMBER 1991 – REVISED JULY 1999 COMPENSATION-CAPACITOR SELECTION INFORMATION The TL2217-285 is a low-dropout regulator. This means that the capacitance loading is important to the performance of the regulator because it is a vital part of the control loop. The capacitor value and the equivalent series resistance (ESR) both affect the control loop and must be defined for the load range and the temperature range. Figure 3 and Figure 4 can be used to establish the capacitance value and ESR range for best regulator performance. ESR (OUTPUT CAPACITOR) vs LOAD CURRENT 3 2.6 2.4 0.04 Not Recommended Potential Instability 0.035 0.03 2.2 2 ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇÇÇ 1.6 1.4 1.2 400 µF 0.02 200 µF 0.015 1 Min ESR Boundary 0.8 0.6 0.4 100 µF 0.01 0.005 22 µF 0.2 0 0 0.1 0.2 0.3 0.4 0.5 0 10 µF 0 0.5 Load Voltage 1.5 2 2.5 Figure 2 ∆ IL ∆ VL Figure 1 4 1 1/ESR IL – Load Current – A Applied Load Current POST OFFICE BOX 655303 1000 µF Region of Best Stability 0.025 Max ESR Boundary 1.8 ÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ ÇÇÇÇÇÇÇÇÇÇÇÇ Not Recommended Potential Instability Recommended Min ESR CL ESR – Equivalent Series Resistance – Ω ÇÇ CL = 22 µF CI = 0.1 µF TJ = 25°C 2.8 STABILITY vs ESR • DALLAS, TEXAS 75265 3 3.5 4 4.5 5 TL2217-285 FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION SLVS066F – NOVEMBER 1991 – REVISED JULY 1999 APPLICATION INFORMATION Connector TERMPWR 1N5817 5-V Logic Supply 110 Ω (each resistor) 1% TL2217-285 INPUT OUTPUT GND DB(0) DB(1) 0.1 µF VO = 2.85 V 0.1 µF Ceramic + 22 µF Tantalum ATN BSY ACK RST MSG SEL C/D REQ I/O Figure 3. Typical Application Schematic POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. 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