FAN1585AT18

www.fairchildsemi.com FAN1585A 5A Adjustable/Fixed Low Dropout Linear Regulator Features • • • • • • Fast transient response Low dropout voltage at up to 5A Load regulation: 0.05% typical Trimmed current limit On-chip thermal limiting Packages: TO-220, TO-252, TO-263 and TO-263 Centercut Description The FAN1585A, FAN1585A-1.5, and FAN1585A-1.8 are low dropout three-terminal regulators with 5A output current capability. These devices have been optimized for low voltage applications including VTT bus termination for FC-PGA, where transient response and minimum input voltage are critical. The FAN1585A-1.5 offers fixed 1.5V with 5A current capabilities for AGTL+ bus VTT termination for FC-PGA. The FAN1585A is ideal for low voltage microprocessor applications requiring a regulated output from 1.5V to 3.6V with an input supply of 5V or less, or for FC-PGA applications with significant trace resistance. Current limit is trimmed to ensure specified output current and 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 FAN1585A series regulators are available in the industrystandard TO-220, TO-252, TO-263 and TO-263 Centercut power packages. Applications • • • • • AGTL+ bus supply for FC-PGA Low voltage logic supply Post regulator for switching supply 3.3V to 1.5V linear regulator 5V to 1.8V linear regulator Typical Applications VIN = 3.3V 22µF + FAN1585A VOUT VIN ADJ R1 124Ω R2 24.9Ω VOUT = VREF(1 + R2/R1) + IAdj • R2 + 1.5V at 5A 22µF VIN = 3.3V 22µF + FAN1585A-1.5 VIN VOUT GND + 1.5V at 5A 22µF REV. 1.1.6 7/8/05 FAN1585A PRODUCT SPECIFICATION Pin Assignments FRONT VIEW Tab is Out. 1 2 3 FRONT VIEW Tab is VOUT FRONT VIEW FRONT VIEW Tab is Out. 1 1 2 3 2 3 1 2 3 Tab is Out. ADJ/ OUT IN GND 3-Lead Plastic TO-220 θJC = 3°C/W ADJ/ OUT GND IN ADJ/ OUT IN GND 3-Lead Plastic TO-263 θJC = 3°C/W* ADJ/ GND IN 3-Lead Plastic TO-252 θJC = 3°C/W 3-Lead Plastic TO-263 Center Cut θJC = 3°C/W* *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. Absolute Maximum Ratings Parameter VIN Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) 0 -65 Min. Max. 18 125 150 300 Unit V °C °C °C 7 6 5 IOUT (Amps) 4 3 2 1 0 0 2 4 6 8 10 12 14 VIN–VOUT (V) Absolute Maximum Safe Operating Area 2 REV. 1.1.6 7/8/05 PRODUCT SPECIFICATION FAN1585A Electrical Characteristics Tj = 25°C unless otherwise specified. The • denotes specifications which apply over the specified operating temperature range. Parameter Reference Voltage Output Voltage4 Output Voltage5 Line Regulation1, 2 Load Regulation1, 2, 3 Dropout Voltage Current Limit Adjust Pin Current3 Adjust Pin Current Change3 1.5V ≤ (VIN – VOUT) ≤ 5.75V, 10mA ≤ IOUT ≤ 5A 1.5V ≤ (VIN – VOUT) ≤ 12V VIN = 5V f = 120Hz, COUT = 22µF Tantalum, (VIN – VOUT) = 3V, IOUT = 5A TA = 25°C, 30ms pulse • TA = 125°C, 1000 hrs. TA = 25°C, 10Hz ≤ f ≤ 10kHz TO-220, TO-252, TO-263, and TO-263 CC 3 Conditions 1.5V ≤ (VIN – VOUT) ≤ 5.75V, 10mA ≤ IOUT ≤ 5A 3.0V ≤ VIN ≤ 8V 10mA ≤ IOUT ≤ 5A 3.3V ≤ VIN ≤ 8.3V 10mA ≤ IOUT ≤ 5A (VOUT + 1.5V) ≤ VIN ≤ 12V, IOUT = 10mA (VIN – VOUT) = 3V, 10mA ≤ IOUT ≤ 5A ∆VREF = 1%, IOUT = 5A (VIN – VOUT) = 2V • • • • • • • • • • • Min. 1.225 (-2%) 1.47 1.764 Typ. 1.250 1.5 1.8 0.005 0.05 1.150 Max 1.275 (+2%) 1.53 1.836 0.2 0.5 1.300 120 5 Units V V V % % V A µA µA mA 5.1 5.9 35 0.2 Minimum Load Current Quiescent Current Ripple Rejection Thermal Regulation Temperature Stability Long-Term Stability RMS Output Noise (% of VOUT) Thermal Resistance, Junction to Case Thermal Shutdown 10 4 60 72 0.004 0.5 0.03 0.003 3 150 1.0 0.02 13 mA dB %/W % % % °C/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. Power dissipation is determined by input/ output differential and the output currrent. Guaranteed maximum output power will not be available over the full input/output voltage range. 3. FAN1585A only. 4. FAN1585A-1.5 only. 5. FAN1585A-1.8 only. REV. 1.1.6 7/8/05 3 FAN1585A PRODUCT SPECIFICATION Typical Performance Characteristics 1.5 OUTPUT VOLTAGE DEVIATION (%) 0.10 1.4 DROPOUT VOLTAGE (V) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0 1 2 3 4 5 6 OUTPUT CURRENT (A) T=0°C T=25°C T=125°C ∆I = 5A 0.05 0 -0.05 -0.10 -0.15 -0.20 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) Figure 1. Dropout Voltage vs. Output Current Figure 2. Load Regulation vs. Temperature 1.275 1.270 3.70 VOUT set with 1% Resistors 3.65 REFERENCE VOLTAGE (V) 3.60 3.55 3.50 3.45 3.40 3.35 3.30 3.25 VOUT = 3.3V 1 VOUT = 3.6V 1 REFERENCE VOLTAGE (V) 1.265 1.260 1.255 1.250 1.245 1.240 1.235 1.230 1.225 -75 -50 -25 0 25 50 75 100 125 150 175 Note: 1. FAN1585A Only 3.20 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) Figure 3. Reference Voltage vs. Temperature Figure 4. Output Voltage vs. Temperature 5 MINIMUM LOAD CURRENT (mA) 100 90 Note: 1. FAN1585A Only 4 ADJUST PIN CURRENT (µA) 0 25 50 75 100 125 150 175 80 70 60 50 40 30 20 10 3 2 1 0 -75 -50 -25 0 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) Figure 5. Minimum Load Current vs. Temperature Figure 6. Adjust Pin Current vs. Temperature 4 REV. 1.1.6 7/8/05 PRODUCT SPECIFICATION FAN1585A Typical Performance Characteristics (continued) 8.0 SHORT-CIRCUIT CURRENT (A) 90 80 RIPPLE REJECTIONS (dB) 7.0 70 60 50 40 30 20 10 (VIN – VOUT) ≤ 3V 0.5V ≤ VRIPPLE ≤ 2V IOUT = 5A 100 1K FREQUENCY (Hz) 10K 100K 6.0 5.0 4.0 -75 -50 -25 0 25 50 75 100 125 150 175 0 10 JUNCTION TEMPERATURE (°C) Figure 7. Short-Circuit Current vs. Temperature Figure 8. Ripple Rejection vs. Frequency 20 OUTPUT CAPACITANCE ESR, (Ω) 2.5 2 POWER (W) 15 1.5 Area of Instability 1 10 5 0.5 Stable Area 0 0 1000 2000 3000 4000 5000 LOAD CURRENT (mA) 0 50 60 70 80 90 100 110 120 130 140 150 CASE TEMPERATURE (°C) Figure 9. Maximum Power Dissipation Figure 10. Stability Region VIN/VOUT = 5V/1.5V REV. 1.1.6 7/8/05 5 FAN1585A PRODUCT SPECIFICATION Applications Information General The FAN1585A and FAN1585A-1.5 are three-terminal 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 FAN1585A 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+. break down and none of the protection circuitry is then functional. D1 1N4002 (OPTIONAL) FAN1585A VIN C1 22µF + IN ADJ + CADJ R2 OUT R1 + VOUT C2 22µF Stability The FAN1585A series requires an output capacitor as a part of the frequency compensation. It is recommended to use a 22µF solid tantalum or a 100 µF 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