www.fairchildsemi.com FAN1582 3A Adjustable/Fixed Ultra Low Dropout Linear Regulator Features Description • • • • • • • The FAN1582, FAN1582-1.5, and FAN1582-2.5 are ultra-low dropout regulators with 3A output current capability. These devices have been optimized for low voltage applications including VTT bus termination, where transient response and minimum input voltage are critical. The FAN1582 is ideal for low voltage microprocessor applications requiring a regulated output from 1.3V to 5.7V with a power input supply of 1.75V to 6.5V. The FAN1582-1.5 offers fixed 1.5V with 3A current capabilities for GTL+ bus VTT termination. The FAN1582-2.5 offers fixed 2.5V with 3A current capability for logic IC operation and processors while minimizing the overall power dissipation. Ultra Low dropout voltage, 0.4V typical at 3A Remote sense operation Fast transient response Load regulation: 0.05% typical 0.5% initial accuracy On-chip thermal limiting 5-Pin SPAK, TO-252 DPAK, and TO-263 packages Applications • • • • • • • Pentium® Processors PowerPC™, AMD K5 and K6 processors Pentium support of GTL+ bus supply Low voltage logic supply Embedded Processor supplies Split plane regulator New 2.5V and 1.8V Logic Families Current limit ensures controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload and ambient temperature that would create excessive junction temperatures. The FAN1582 series regulators are available in the 5-Pin SPAK, TO-252 DPAK, and TO-263 power packages. Typical Applications VIN = 3.3V + 10µF VIN = 3.3V + 10µF VCNTL = 5V VIN + 22µF 2.1V at 3A VCNTL Adj 2.5V at 3A + GND 1µF FAN1582 VOUT VSENSE FAN1582–2.5 VOUT VCNTL VCNTL = 5V VSENSE VIN + 124Ω 22µF VIN = 5.75V + 86.6Ω 10µF VCNTL = 12V VIN VSENSE FAN1582 VOUT 5V at 3A VCNTL Adj + 124Ω 22µF 374Ω Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation. REV. 1.1.2 2/26/03 FAN1582 PRODUCT SPECIFICATION Pin Assignments 5-Lead Plastic SPAK ΘJC=2°C/W* Tab is out. 3 4 5 1 2 3 4 5 IN 2 OUT CNTL IN 5-Lead Plastic TO-263 ΘJC=3°C/W* Tab is out. 1 CNTL 4 5 S 1 2 3 GND 4 5 IN 1 2 3 OUT 1 2 3 4 5 FRONT VIEW CNTL 1 2 3 4 5 FAN1582D-1.5, -2.5 S FRONT VIEW FAN1582D FRONT VIEW ADJ FRONT VIEW S GND OUT FRONT VIEW CNTL IN FAN1582P-1.5, -2.5 S ADJ OUT FAN1582P FRONT VIEW S ADJ OUT CNTL IN FAN1582M S GND OUT CNTL IN FAN1582M-1.5, -2.5 5-Lead Plastic TO-252 DPAK ΘJC=3°C/W* Tab is out. *With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, θJA can vary from 30 °C/W to more than 40 °C/W. Other mounting techniques can provide a thermal resistance lower than 30 °C/W. Pin Definitions Pin Number Pin Name Pin Function Descrition 1 VSense 2 ADJ/GND 3 VOUT Output Voltage. This pin and the tab are output. 4 VCNTL Control Voltage. This pin draws small-signal power to control the FAN1582 circuitry. Connect to a voltage higher than VIN, as shown in the applications circuits. 5 VIN Remote Voltage Sense. Connect this pin to the load to permit true remote sensing and avoid trace drops. Adjust or Ground. On the FAN1582, this pin forms the feedback to determine the output voltage. On the FAN1582-1.5 and -2.5, connect this pin to ground. Input Voltage. Internal Block Diagram 4 VCNTL, Control 5 Vin, Power Thermal Shutdown Current Limit Vref 2 Voltage Loop Amplifier 3 Output 1 Sense 2 Adj REV. 1.1.2 2/26/03 PRODUCT SPECIFICATION FAN1582 Absolute Maximum Ratings Parameter Min. VIN VCNTL Operating Junction Temperature Range 0 Lead Temperature (Soldering, 10 sec.) Storage Temperature Range -65 Max. Unit 7 V 13.2 V 125 °C 300 °C 150 °C Electrical Characteristics TJ=25°C, VOUT = VS, VADJ = 0V unless otherwise specified. The • denotes specifications which apply over the specified operating temperature range. Parameter Reference Voltage3 Reference Voltage3 Adjustable Output Voltage Output Voltage4 Output Voltage5 Line Regulation1,2 Load Regulation1,2 Dropout Voltage Minimum (VCNTL–VOUT) Dropout Voltage Minimum (VIN–VOUT) Dropout Voltage Minimum VIN Current Limit Control Pin Current Adjust Pin Current3 Minimum Load Current Ripple Rejection Thermal Resistance, Junction to Case Thermal Regulation Thermal Shutdown Conditions VIN = 2.0V, VCNTL = 2.75V, IOUT = 10mA 2.05V ≤ VIN ≤ 5.5V, 2.7V ≤ VCNTL ≤ 12V, 10mA ≤ IOUT ≤ 3A 3V ≤ VIN ≤ 7V (function of Vout), 10mA ≤ IOUT ≤ 3A 3V ≤ VIN ≤ 7V, 10mA ≤ IOUT ≤ 3A 5.1V ≤ VIN ≤ 7V, 10mA ≤ IOUT ≤ 3A 1.75V ≤ VIN ≤ 5.5V, 2.5V ≤ VCNTL ≤ 12V, IOUT = 10mA VIN = 2.1V, VCNTL = 2.75V, 10mA ≤ IOUT ≤ 3A VIN = 2.05V, ∆VREF = 1%, IOUT = 3A VCNTL = 2.75V, ∆VREF = 1%, IOUT = 3A VCNTL = 2.75V, ∆VREF = 1%, IOUT = 3A VIN = 2.05V, VCNTL = 2.75V VIN = 2.05V, VCNTL = 2.75V, IOUT = 10mA VIN = 2.05V, VCNTL = 2.75V VIN = 3.3V, VCNTL = 5V VIN = 3.75V, VCNTL = 3.75V, f = 120Hz, COUT = 22µF Tantalum, IOUT = 1.5A TO-263/TO-252 SPAK TA = 25°C, 30ms pulse Min. 1.243 Typ. 1.250 Max. 1.257 Units V • 1.237 1.250 1.263 V • Vref 1.5 5.7 V • • • 1.47 2.474 1.5 2.5 1 1.53 2.526 3 V V mV • 1 5 mV • 1.05 1.18 V 0.4 0.5 V 0.5 0.6 V 2 6 A mA 50 5.0 80 120 10 • • • 3.1 • • 60 3 2 0.002 150 µA mA dB °C/W 0.02 %/W °C Notes: 1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. 2. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is determined by input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/ output voltage range. 3. FAN1582 only. 4. FAN1582-1.5 only. 5. FAN1582-2.5 only. REV. 1.1.2 2/26/03 3 FAN1582 PRODUCT SPECIFICATION OUTPUT VOLTAGE DEVIATION (%) Typical Perfomance Characteristics 1.0 DROPOUT VOLTAGE (V) 0.9 0.8 0.7 0.6 T=0°C 0.5 0.4 T=25°C T=125°C 0.3 0.2 0.1 0.0 0 0.5 1 1.5 2 2.5 3 OUTPUT CURRENT (A) 0.10 0 -0.05 -0.10 -0.15 -0.20 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) Load Regulation vs. Temperature 1.275 3.70 1.270 1.265 1.260 1.255 3.65 3.60 3.55 3.50 OUTPUT VOLTAGE (V) REFERENCE VOLTAGE Dropout Voltage vs. Output Current 1.250 1.245 1.240 1.235 1.230 1.225 ∆Ι=3A 0.05 VOUT set with 1% resistors 3.45 3.40 3.35 3.30 3.25 3.20 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) VOUT = 3.3V1 -75 -50 100 10 8 6 4 2 0 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) Mimimum Load Current vs. Temperature 4 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) Output Voltage vs. Temperature ADJUST PIN CURRENT (µA) MINIMUM LOAD CURRENT (mA) Reference Voltage vs. Temperature Note: 1. FAN1582 Only Note: 1. FAN1582 Only 90 80 70 60 50 40 30 20 10 0 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) Adjust Pin Current vs. Temperature REV. 1.1.2 2/26/03 PRODUCT SPECIFICATION FAN1582 Typical Perfomance Characteristics (continued) 90 90 RIPPLE REJECTIONS (dB) SHORT-CIRCUIT CURRENT (A) 6 5 4 3 70 60 50 40 30 (VIN—VOUT) ≤ 3V 20 0.5V ≤ VRIPPLE ≤ 2V 10 2 IOUT = 3A 0 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) 10 Short-Circuit Current vs.Temeperature 100 1K 10K FREQUENCY (HZ) 100K Ripple Rejection vs. Frequency 20 POWER (W) 15 10 5 0 25 45 65 85 105 CASE TEMPERATURE 125 Maximum Power Dissipation General The FAN1582, FAN1582-1.5, and FAN1582-2.5 are threeterminal regulators optimized for GTL+ VTT termination and logic applications. These devices are short-circuit protected, and offer thermal shutdown to turn off the regulator when the junction temperature exceeds about 150°C. The FAN1582 series provides low dropout voltage and fast transient response. Frequency compensation uses capacitors with low ESR while still maintaining stability. This is critical in addressing the needs of low voltage high speed microprocessor buses like GTL+. sequencing problems. The output voltage will not turn on until both supplies are operating. If the control voltage comes up first, the output current will be typically limited to about 3.0 mA until the power input voltage comes up. If the power input voltage comes up first the output will not turn on at all until the control voltage comes up. The output can never come up unregulated. The FAN1582 can also be used as a single supply device with the control and power inputs tied together. In this mode, the dropout is determined by the minimum control voltage. VIN and VCNTL Functions Stability The FAN1582 utilizes a dual supply approach to maximize efficiency. The collector of the power device is brought out to the VIN pin to minimize internal power dissipation under high current loads. VCNTL provides power for the control circuitry and the drive for the output NPN transistor. VCNTL should be at least 1.2 V higher than the output voltage. Special care was taken to ensure there are no supply- The FAN1582 series requires an output capacitor as a part of the frequency compensation. It is recommended to use a 22µF solid tantalum or a 100µF aluminum electrolytic on the output to ensure stability. The frequency compensation of these devices optimizes the frequency response with low ESR capacitors. In general, it is suggested to use capacitors with an ESR of <0.3Ω. It is also recommended to use bypass capacitors such as a 22µF tantalum or a 100µF aluminum on the adjust REV. 1.1.2 2/26/03 5 FAN1582 PRODUCT SPECIFICATION pin of the FAN1582 for low ripple and fast transient response. When these bypassing capacitors are not used at the adjust pin, smaller values of output capacitors provide equally good results. Protection Diodes In normal operation, the FAN1582 series does not require any protection diodes. For the FAN1582, internal resistors limit internal current paths on the adjust pin. Therefore, even with bypass capacitors on the adjust pin, no protection diode is needed to ensure device safety under short-circuit conditions. A protection diode between the input and output pins is usually not needed. An internal diode between the input and the output pins on the FAN1582 series can handle microsecond surge currents of 50A to 100A. Even with large value output capacitors it is difficult to obtain those values of surge currents in normal operation. Only with large values of output capacitance, such as 1000µF to 5000µF, and with the input pin instantaneously shorted to ground can damage occur. A crowbar circuit at the input can generate those levels of current; a diode from output to input is then recommended, as shown in Figure 1. Usually, normal power supply cycling or system “hot plugging and unplugging” will not generate current large enough to do any damage. The adjust pin can be driven on a transient basis ±7V with respect to the output, without any device degradation. As with any IC regulator, exceeding the maximum input-to-output voltage differential causes the internal transistors to break down and none of the protection circuitry is then functional. VIN Vcntl + Vin Vsense + R1 VOUT C2 22µF R2 CADJ D1 1N4002 (OPTIONAL) VCNTL VIN Vcntl + C1 10µF Vin Gnd Vout + VOUT C2 22µF Figure 1. Optional Protection Diode 6 The current out of the adjust pin adds to the current from R1 and is typically 50µA. Its output voltage contribution is small and only needs consideration when a very precise output voltage setting is required. Vcntl Vcntl Vsense FAN1582 Vin Adj Vout VIN + VOUT VREF C1 10µF + R1 C2 22µF R2 Load Regulation The FAN1582 family provides true remote sensing, eliminating output voltage errors due to trace resistance. To utilize remote sensing, connect the VSENSE pin directly to the load, rather than at the VOUT pin. If the load is more than 1" away from the FAN1582, it may be necessary to increase the load capacitance to ensure stability. Thermal Considerations Vsense FAN1582–1.5, 2.5 The FAN1582 regulator develops a 1.25V reference voltage between the output pin and the adjust pin (see Figure 2). Placing a resistor R1 between these two terminals causes a constant current to flow through R1 and down through R2 to set the overall output voltage. Normally, this current is the specified minimum load current of 10mA. Figure 2. Basic Regulator Circuit Adj Vout + Output Voltage VOUT = VREF (1+R2/R1) + IADJ (R2) FAN1582 C1 10µF In applications that require improved ripple rejection, a bypass capacitor from the adjust pin of the FAN1582 to ground reduces the output ripple by the ratio of VOUT/1.25V. The impedance of the adjust pin capacitor at the ripple frequency should be less than the value of R1 (typically in the range of 100Ω to 120Ω) in the feedback divider network in Figure 1. Therefore, the value of the required adjust pin capacitor is a function of the input ripple frequency. For example, if R1 equals 100Ω and the ripple frequency equals 120Hz, the adjust pin capacitor should be 22µF. At 10kHz, only 0.22µF is needed. IADJ 50µA D1 1N4002 (OPTIONAL) VOUT Ripple Rejection The FAN1582 series protect themselves under overload conditions with internal power and thermal limiting circuitry. However, for normal continuous load conditions, do not exceed maximum junction temperature ratings. It is important to consider all sources of thermal resistance from junction-toambient. These sources include the junction-to-case resistance, the case-to-heat sink interface resistance, and the heat sink resistance. Thermal resistance specifications have been developed to more accurately reflect device temperature and ensure safe operating temperatures. The electrical character- REV. 1.1.2 2/26/03 PRODUCT SPECIFICATION FAN1582 istics section provides a separate thermal resistance and maximum junction temperature for both the control circuitry and the power transistor. Calculate the maximum junction temperature for both sections to ensure that both thermal limits are met. The power dissipation in this application is: For example, look at using an FAN1582M-1.5 to generate 3A @ 1.5V ± 2% from a 3.3V source (3.2V to 3.6V). TJ = TA + (PD) * (Θ Case-to-Ambient + ΘJC) = 70 + (6.39) * (5 + 3) = 121°C Assumptions: The junction temperature is below the maximum rating. • • • • • Vin = 3.6V worst case VOUT = 1.47V worst case IOUT = 3A continuous TA = 70°C Θ Case-to-Ambient = 5°C/W (assuming both a heatsink and a thermally conductive material) PD = (VIN - VOUT) * (IOUT) = (3.6-1.47) * (3) = 6.39W From the specification table, Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. This is the lowest resistance path for heat flow. Proper mounting ensures the best thermal flow from this area of the package to the heat sink. Use of a thermally conductive material at the case-to-heat sink interface is recommended. Use a thermally conductive spacer if the case of the device must be electrically isolated and include its contribution to the total thermal resistance. U1 VIN = 3.3V 10µF VIN + C1 VSENSE FAN1582 VOUT 2.1V at 3A VCNTL VCNTL = 5V 1µF C4 Adj 10µF C3 + R1 124Ω R2 86.6Ω 100µF C2 Figure 3. Application Circuit (FAN1582) Table 1. Bill of Materials for Application Circuit for the FAN1582 Item Quantity Manufacturer Part Number Description C1, C3 2 Xicon L10V10 10µF, 10V Aluminum C2 1 Xicon L10V100 100µF, 10V Aluminum C4 1 Any R1 1 Generic 124Ω, 1% R2 1 Generic 86.6Ω, 1% U1 1 Fairchild REV. 1.1.2 2/26/03 1µF Ceramic FAN1582P 3A Regulator 7 FAN1582 PRODUCT SPECIFICATION U1 VIN = 2.5V 10µF C1 VIN + VSENSE FAN1582–1.5 VOUT VCNTL VCNTL = 3.3V GND C2 1µF 1.5V at 3A + 100µF C3 Figure 4. Application Circuit (FAN1582-1.5) Table 2. Bill of Materials for Application Circuit for the FAN1582-1.5 Item Quantity Manufacturer Part Number Description C1 1 Xicon L10V10 10µF, 10V Aluminum C2 1 Any C3 1 Xicon L10V100 100µF, 10V Aluminum U1 1 Fairchild FAN1582P-1.5 3A Regulator 1µF Ceramic U1 VIN = 3.3V + 10µF C1 VIN VSENSE FAN1582–2.5 VOUT VCNTL VCNTL = 5V + 2.5V at 3A + GND 1µF C2 100µF C3 Figure 5. Application Circuit (FAN1582-2.5) Table 3. Bill of Materials for Application Circuit for the FAN1582-2.5 Item 8 Quantity Manufacturer Part Number Description C1 1 Xicon L10V10 10µF, 10V Aluminum C2 1 Any C3 1 Xicon L10V100 100µF, 10V Aluminum U1 1 Fairchild FAN1582P-2.5 3A Regulator 1µF Ceramic REV. 1.1.2 2/26/03 PRODUCT SPECIFICATION FAN1582 Mechanical Dimensions 5-Lead TO-263 Package A 10.20 9.80 1.40 1.00 9.50 MIN 9.40 9.00 9.00 MIN 10.00 5.10 4.70 1 5 4.00 MIN 1.37 1.17 0.90 0.70 (1.28) 1.70 1.70 0.25 6.80 M B AM 1.20 MIN 6.80 LAND PATTERN RECOMMENDATION –B– 4.70 4.30 (8.00) (4.40) 1.40 1.14 R0.45 (1.75) (0.90) (6.80) SEE DETAIL A 15.60 15.00 5 1 NOTES: UNLESS OTHERWISE SPECIFIED A) ALL DIMENSIONS ARE IN MILLIMETERS. B) STANDARD LEAD FINISH: 200 MICROINCHES/ 5.08 MICROMETERS MIN. LEAD/TIN 15/85 ON COPPER. C) NO PACKAGE STANDARD REFERENCE AS OF JUNE 2002. D) DIMENSIONING AND TOLERANCING PER ANSI Y14.5M – 1982. GAGE PLANE R0.56 0.75 0.45 SEATING PLANE 2.84 2.24 0.25 0.10 B 8° 0° DETAIL A, ROTATED 90° SCALE: 10X REV. 1.1.2 2/26/03 9 FAN1582 PRODUCT SPECIFICATION Mechanical Dimensions (continued) 5-Lead TO-252 Package 6.00 MIN A 6.80 6.35 5.64 5.04 1.27 0.50 6.56 MIN 6.30 5.90 6.25 1.02 0.60 3.00 MIN C 1 3 2 1 5 4 1.27 (0.44) 0.57±0.07 1.27 1.00 3.81 0.69±0.15 1.27 0.25 M A M C LAND PATTERN RECOMMENDATION 5.08 B 2.40 2.18 0.60 0.40 (5.09) (4.05) 10.42 9.20 SEE DETAIL A 3 5 4 2 1 0.10 B GAGE PLANE 0.60 0.40 0.51 (1.54) NOTES: UNLESS OTHERWISE SPECIFIED 10° 0° 1.78 1.40 A) ALL DIMENSIONS ARE IN MILLIMETERS. B) THIS PACKAGE CONFORMS TO JEDEC, TO-252, ISSUE C, VARIATION AA, DATED NOV. 1999. 0.13 MAX (2.90) SEATING PLANE DETAIL A (ROTATED 90°) SCALE: 2X 10 REV. 1.1.2 2/26/03 FAN1582 PRODUCT SPECIFICATION Mechanical Dimensions (continued) 5-Lead SPAK Package Inches Symbol Min. Millimeters Max. Min. Notes: 1. All linear dimensions are in inches (millimeters). 2. This drawing is subject to change without notice. 3. The center lead is in electrical contact with the thermal tab. 4. Dimensions do not include mold protrusions, not to exceed 0.006 (0,15). Notes Max. A B b1 b2 0.350 0.360 0.220 NOM 0.268 0.025 0.031 8.89 9.14 5.59 NOM 6.81 0.63 0.79 C c1 c2 0.080 0.070 0.040 0.050 0.010 NOM D E e L L1 L2 L3 R α 0.295 NOM 0.365 0.375 0.067 2.03 1.78 1.02 1.27 0.25 NOM 7.49 NOM 9.27 9.52 1.72 0.410 0.420 0.031 0.041 0.350 0.360 0.310 0.320 0.010 NOM 0° 8° 10.41 10.67 0.79 1.04 8.89 9.14 7.87 8.13 0.25 NOM 0° 8° E C A c1 B c2 D L3 L 1 L2 Thermal Ta b (See Note 3) 5 Seating Plane b2 e b1 0.004 (0,10) 0.010 (0,25) M 0.005 (0.13) 0.001 (0.03) R L1 Gage Plane 3°–6° 11 REV. 1.1.2 2/26/03 FAN1582 PRODUCT SPECIFICATION Ordering Information Product Number Package FAN1582MX TO-263 in Tape and Reel FAN1582PX SPAK in Tape and Reel FAN1582DX TO-252 DPAK in Tape and Reel FAN1582M15X TO-263 in Tape and Reel FAN1582P15X SPAK in Tape and Reel FAN1582D15X TO-252 DPAK in Tape and Reel FAN1582M25X TO-263 in Tape and Reel FAN1582P25X SPAK in Tape and Reel FAN1582D25X TO-252 DPAK in Tape and Reel LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 2/26/03 0.0m 002 Stock#DS30001584 2001 Fairchild Semiconductor Corporation