FAN1581 FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

  • Ultra Low dropout voltage, 0.4V typical at 5A
  • 1.2V Versions available for GTL termination
  • Remote sense operation
  • Fast transient response
  • Load regulation: 0.05% typical
  • 0.5% typical initial accuracy
  • On-chip thermal limiting
  • TO-263, TO-252 and TO-220 packages

Applications

  • Support of GTL+ bus supply
  • Low voltage logic supply
  • Embedded Processor supplies
  • Split plane regulator
  • 2.5V , and 1.8V Logic Families
  • DDR Termination Supply

Description

The FAN1581, FAN1581-1.2, FAN1581-1.5, and FAN1581- 2.5 are ultra-low dropout regulators with 5A output current capability. These devices have been optimized for low volt- age applications including V TT bus termination, where tran- sient response and minimum input voltage are critical. The FAN1581 is ideal for low voltage microprocessor applica- tions requiring a regulated output from 1.3V to 5.7V with a power input supply of 1.75V to 6.5V . The FAN1581-1.5 offers fixed 1.5V with 5A current capabilities for GTL+ bus V TT termination. Additionally, the FAN1581-1.2 offers fixed 1.2V output for CPU Bus termination. The FAN1581-2.5 offers fixed 2.5V with 5A current capability for logic IC operation and processors while minimizing the overall power dissipation. Current limit ensures controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload and ambient temperature that would create exces- sive junction temperatures. The FAN1581 series regulators are available in the 5-pin TO-263, TO-252 and TO-220 packages. Typical Applications 22µF 22µF VCNTL = 5V 2.1V at 5A 10µF VIN = 3.3V 10µF VIN VSENSE VCNTL Adj VOUT FAN1581 22µF VCNTL = 5V 2.5V at 5A 10µF VIN = 3.3V 1µF 1µF 1µF 1µF VIN VSENSE VCNTL GND VOUT FAN1581–2.5 86.6Ω 124Ω VCNTL = 5V 1.2V at 5A VIN = 3.3V VIN VSENSE VCNTL Gnd VOUT FAN1581-1.2 22µF VCNTL = 12V 5V at 5A 10µF VIN = 5.75V VIN VSENSE VCNTL Adj VOUT FAN1581 374Ω 124Ω FAN1581 5A Adjustable/Fixed Ultra Low Dropout Linear Regulator

FAN1581 PRODUCT SPECIFICATION REV. 1.2.0 11/6/03 Pin Assignments Pin Definitions Internal Block Diagram Pin Number Pin Name Pin Function Descrition VSense Remote Voltage Sense . Connect this pin to the load to permit true remote sensing and avoid trace drops. ADJ/GND Adjust or Ground. On the FAN1581, this pin forms the feedback to determine the output

3 VOUT

Output Voltage. This pin and the tab are output.

4 VCNTL

Control Voltage. This pin draws small-signal power to control the FAN1581 circuitry. Connect to a voltage higher than VIN, as shown in the applications circuits.

5 VIN

Input Voltage. FRONT VIEW 123 4 5 FRONT VIEW 123 4 5 FAN1581M-1.2, FRONT VIEW FAN1581D FRONT VIEW FAN1581D-1.2, -1.5, -2.5 FRONT VIEW FAN1581T 5-Lead Plastic TO-263 Θ JC=3°C/W* Tab is out. 5-Lead TO-220 Θ JC=3°C/W* Tab is VOUT. 5-Lead Plastic TO-252 DPAK Θ JC=3°C/W* Tab is out. ADJ CNTL OUT S IN GND CNTL OUT S IN 1234 5 1234 5 ADJ CNTL OUT S IN 12345 GND CNTL OUT S IN ADJ CNTL OUT S IN *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. Current Limit Thermal Shutdown Vref Vin, Power Output Sense Adj VCNTL , Control Voltage Loop Amplifier

PRODUCT SPECIFICATION FAN1581 REV. 1.2.0 11/6/03 Absolute Maximum Ratings

Electrical Characteristics

T J =25°C, V OUT = V SENSE , V ADJ = 0V unless otherwise specified. The • denotes specifications which apply over the specified operating temperature range. 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. FAN1581 only. 4. FAN1581-1.5 only. 5. FAN1581-2.5 only. 6. FAN1581-1.2 only. Parameter Min. Max. Unit V IN V CNTL 13.2 V Operating Junction Temperature Range 0 125 °C Lead Temperature (Soldering, 10 sec.) 300 °C Storage Temperature Range -65 150 °C Parameter Conditions Min. Typ. Max. Units Reference Voltage 2.05V V IN 5.5V, 2.7V V CNTL 12V, 10mA I OUT

  • 1.237 1.250 1.263 V Adjustable Output Voltage 3V V IN 7V (function of Vout), 10mA I OUT
  • Vref 1.5 5.7 V Output Voltage V IN 7V, 10mA I OUT 5A • 1.47 1.5 1.53 V Output Voltage V IN 7V, 10mA I OUT 5A • 2.474 2.5 2.526 V Output Voltage 2.7V V IN 7V, 10mA I OUT 5A • 1.176 1.200 1.224 V Line Regulation 1,2 1.75V V IN 5.5V, 2.5V V CNTL 12V, I OUT = 10mA
  • 1 3 m V Load Regulation 1,2 V IN = 2.1V, V CNTL = 2.75V, 10mA I OUT
  • 1 5 m V Dropout Voltage Minimum CNTL OUT V IN = 2.05V, V REF = 1%, I OUT = 5A • 1.05 1.18 V Dropout Voltage Minimum IN OUT V CNTL = 2.75V, V REF = 1%, I OUT = 5A 0.4 0.5 V Dropout Voltage Minimum V IN V CNTL = 2.75V, V REF = 1%, I OUT = 5A
  • 0.5 0.6 V Current Limit V IN = 2.05V, V CNTL = 2.75V • 5.2 A Control Pin Current V IN = 2.05V, V CNTL = 2.75V, I OUT = 10mA
  • 3 6 m A Adjust Pin Current V IN = 2.05V, V CNTL = 2.75V • 50 120 µA Minimum Load Current V IN = 3.3V, V CNTL = 5V • 5.0 10 mA Ripple Rejection V IN = 3.75V, V CNTL C OUT = 22µF Tantalum, I OUT = 2.5A 60 80 dB Thermal Resistance, Junction to Case TO-263 SPAK °C/W Thermal Regulation T A = 25°C, 30ms pulse 0.002 0.02 %/W Thermal Shutdown 150 °C

FAN1581 PRODUCT SPECIFICATION REV. 1.2.0 11/6/03 Typical Perfomance Characteristics T=0°C T=125°C T=25°C 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 01 2 4 35 6 DROPOUT VOLTAGE (V)REFERENCE VOLTAGE MINIMUM LOAD CURRENT (mA) OUTPUT CURRENT (A) Dropout Voltage vs. Output Current Load Regulation vs. Temperature Reference Voltage vs. Temperature Output Voltage vs. Temperature Mimimum Load Current vs. Temperature Adjust Pin Current vs. Temperature 0.10 0.05 -0.05 -0.10 -0.15 -0.20 -50 -25 25 50 75 100 125 1500 OUTPUT VOLTAGE DEVIATION (%) JUNCTION TEMPERATURE ( °C) TJ (°C) ∆Ι=5A 1.30 1.28 1.26 1.24 1.22 1.20 OUTPUT VOLTAGE (V) ADJUST PIN CURRENT ( µA) 2.60 2.35 2.10 1.85 1.60 1.35 1.10 -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE ( °C) -75 -50 -25 0 25 50 75 100 125 150 175 JUNCTION TEMPERATURE ( °C) -75 -50 -25 0 25 50 75 100 125 150 175 TJ (°C) -75 -50 -25 0 25 50 75 100 125 150 175 1.2V 1.5V 2.5V

PRODUCT SPECIFICATION FAN1581 REV. 1.2.0 11/6/03 5 Typical Perfomance Characteristics (continued) SHORT-CIRCUIT CURRENT (A)POWER (W) RIPPLE REJECTIONS (dB) -75 -50 -25 25 50 75 100 125 150 175 25 45 65 85 105 125 JUNCTION TEMPERATURE ( °C) CASE TEMPERATUREFREQUENCY (HZ) (VIN— VOUT ) ≤ 3V 0.5V ≤ VRIPPLE ≤ 2V IOUT = 5A 10 100 1K 10K 100K Short-Circuit Current vs.Temeperature 1.0 1.5 2.0 2.5 3.0 3.5 CONTROL PIN CURRENT (mA)0.5 -75 -50 -25 25 50 75 100 125 150 1750 JUNCTION TEMPERATURE ( °C) Control Pin Current vs. Temperature Ripple Rejection vs. Frequency MAX. ACCEPTABLE ESR, OHM LOAD CURRENT, A 1.4 1.2 1.0 0.8 0.6 0.4 0.2 01 2345 FAN1581 Stability Maximum Power Dissipation 10mA Load

TT termination and logic applications. low voltage high speed microprocessor buses like GTL+. circuitry and the drive for the output NPN transistor. the dropout is determined by the minimum control voltage. needed to ensure device safety under short-circuit conditions. current large enough to do any damage. Figure 1. Optional Protection Diode 100Ω to 120Ω ) in the feedback divider network in Figure 1. capacitor should be 22µF. At 10kHz, only 0.22µF is needed. between the output pin and the adjust pin (see Figure 2). specified minimum load current of 10mA.

put voltage setting is required. Figure 2. Basic Regulator Circuit load capacitance to ensure stability. ditions with internal power and thermal limiting circuitry.

  • V OUT = 1.47V worst case
  • I OUT = 5A continuous
  • T A = 40°C
  • Θ Case-to-Ambient = 5°C/W (assuming both a heatsink and a thermally conductive material) The power dissipation in this application is: PD = (VIN - VOUT ) * (IOUT ) = (3.6-1.47) * (5) = 10.65W From the specification table, T J = TA + (PD ) * (Θ Case-to-Ambient + Θ JC) The junction temperature is within the maximum rating. 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 electri- cally isolated and include its contribution to the total thermal resistance. 22µF VIN VOUT VREFC1 10µF Vcntl + + Vcntl Vsense Vin Adj Vout FAN1581 IADJ 50µA VOUT = VREF (1+R2/R1) + IADJ (R2)

Figure 5. Application Circuit (FAN1581-2.5) Table 3. Bill of Materials for Application Circuit for the FAN1581-2.5

PRODUCT SPECIFICATION FAN1581 REV. 1.2.0 11/6/03 10 Mechanical Dimensions 5-Lead TO-263 Package 10.20 9.80 1.40 1.00 9.40 9.00

9.50 MIN

9.00 MIN

4.00 MIN

1.20 MIN

LAND PATTERN RECOMMENDATION 10.00 1.70 6.80 5.10 4.70 (1.28) (8.00) (4.40) 1.70 6.80 (1.75) (0.90) R0.45 –B– (6.80)

0.25 B AMM

1.37 1.17 0.90 0.70 15.60 15.00 2.84 2.24 SCALE: 10X 0.10 B SEATING PLANE 0.75 0.45 0.25 GAGE PLANE 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. DETAIL A, ROTATED 90° R0.56 1.40 1.14 4.70 4.30 SEE DETAIL A A

FAN1581 PRODUCT SPECIFICATION 11 REV. 1.2.0 11/6/03 Mechanical Dimensions (continued) 5-Lead TO-252 Package (2.90) 10° 1.78 1.40 GAGE PLANE 0.60 0.40 SEATING PLANE

0.13 MAX

(1.54) 0.51 (5.09) (4.05) SEE DETAIL A 0.25 M C MCA 1.27 0.50 1.02 0.60 5.64 5.04 6.25 A 2.40 2.18 B0.10 10.42 9.20 0.60 0.40

3.00 MIN

B

6.56 MIN

6.00 MIN

1.27 5.08 5 4 6.80 6.35 6.30 5.90 3.81 1.00(0.44) 1.27 1.27 LAND PATTERN RECOMMENDATION NOTES: UNLESS OTHERWISE SPECIFIED A) ALL DIMENSIONS ARE IN MILLIMETERS. B) THIS PACKAGE CONFORMS TO JEDEC, TO-252, ISSUE C, VARIATION AA, DATED NOV. 1999. (ROTATED 90 °) SCALE: 2X DETAIL A

FAN1581 PRODUCT SPECIFICATION 12 REV. 1.2.0 11/6/03 Mechanical Dimensions (continued) 10.54 9.90 15.87 14.47 13.69 11.81 26.54 24.00 9.39 8.38 3°3° NOTES: UNLESS OTHERWISE SPECIFIED STANDARD LEAD FINISH: 200 MICROINCHES / 5.08 MICROMETERS MIN. LEAD/TIN 15/85 ON COPPER. REFERENCE JEDEC, TS –001, ISSUE A, VARIATION AA, DATED AUGUST 1989 ALL DIMENSIONS ARE IN MILLIMETERS.C) DIMENSIONING AND TOLERANCING PER ASME Y14.5M –1994. (1.30) 1.01 0.50 0.635 0.304 2.92 2.151.70 6.80

0.36 A BM

3.96 3.53 4.82 4.19 1.39 0.88 Ø L A B

FAN1581 PRODUCT SPECIFICATION 11/6/03 0.0m 002 Stock#DS30001581  2003 Fairchild Semiconductor Corporation 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 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

Ordering Information

FAN1581MX TO-263 in Tape and Reel FAN1581DX TO-252 DPAK in Tape and Reel FAN1581M12X TO-263 in Tape and Reel FAN1581D15X TO-252 DPAK in Tape and Reel FAN1581M25X TO-263 in Tape and Reel FAN1581D25X TO-252 DPAK in Tape and Reel FAN1581T TO-220 in Tape and Reel