Details, datasheet, quote on part number: FAN1581DX
PartFAN1581DX
Category
Description5A Adjustable Low Dropout Voltage Regulator (LDO)
CompanyFairchild Semiconductor
DatasheetDownload FAN1581DX datasheet
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Features, Applications

Features

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

Description

The FAN1581x12, FAN1581-1.5, and FAN15812.5 are ultra-low dropout regulators with 5A 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 FAN1581 is ideal for low voltage microprocessor applications requiring a regulated output from to 5.7V with a power input supply to 6.5V. The FAN1581-1.5 offers fixed 1.5V with 5A current capabilities for GTL+ bus VTT termination. Additionally, the FAN1581x12 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 excessive junction temperatures. The FAN1581 series regulators are available in the 5-pin SPAK, TO-263, TO-252 and TO-220 packages.

Applications

Pentium Processors PowerPCTM, 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 DDR Termination Supply

Typical Applications

VIN 3.3V 10F VIN 3.3V 10F VCNTL 1F + VIN VSENSE VCNTL 86.6 22F VIN 5.75V 10F VCNTL = 12V VIN 3.3V 10F VCNTL 1F + VIN VSENSE 1F + VIN VSENSE + VIN VSENSE FAN15812.5 VOUT VCNTL GND

Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.

FAN1581M-1.5, -2.5 FRONT VIEW FAN1581M FRONT VIEW FAN1581P FRONT VIEW FAN1581P-1.5, -2.5 FRONT VIEW FAN1581D FRONT VIEW FAN1581D-1.5, -2.5 FRONT VIEW


TO-220 JC=3C/W* Tab is VOUT. *With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, JA 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 Function Descrition Remote Voltage Sense. Connect this pin to the load to permit true remote sensing and avoid trace drops. Adjust or Ground. On the FAN1581, this pin forms the feedback to determine the output voltage. On the FAN1581-1.5 and -2.5, connect this pin to ground. Output Voltage. This pin and the tab are output. 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. Input Voltage.

Thermal Shutdown Current Limit 3 Output 1 Sense 2 Adj

Parameter VIN VCNTL Operating Junction Temperature Range Lead Temperature (Soldering, 10 sec.) Storage Temperature Range Min. Max. Unit V C

TJ=25C, VOUT = VS, VADJ = 0V unless otherwise specified. The denotes specifications which apply over the specified operating temperature range. Parameter Reference Voltage3 FAN1581x12 Reference Voltage3 Conditions VIN = 2.0V, VCNTL = 2.75V, IOUT 10mA 2.05V VIN 5.5V, 2.7V VCNTL 12V, 10mA IOUT 5A 3V VIN 7V (function of Vout), 10mA IOUT 5A 3V VIN 7V, 10mA IOUT 5A 5.1V VIN 7V, 10mA IOUT 5A 1.75V VIN 5.5V, 2.5V VCNTL 12V, IOUT = 10mA VIN = 2.1V, VCNTL 2.75V, 10mA IOUT 5A VIN = 2.05V, VREF = 1%, IOUT = 5A VCNTL = 2.75V, VREF = 1%, IOUT = 5A VCNTL = 2.75V, VREF = 1%, IOUT = 5A 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 = 120Hz, COUT = 22F Tantalum, IOUT 2.5A TO-263 SPAK 25C, 30ms pulse Min. 1.164 1.237 Typ. 1.200 1.250 Max. 1.236 1.263 Units V

FAN1581x12 Adjustable Output Voltage Output Voltage4 Output Voltage5 Line Regulation1,2 Load Regulation1,2 Dropout Voltage Minimum (VCNTLVOUT) Dropout Voltage Minimum (VINVOUT) 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

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. REV. 1.1.8 4/7/03


 

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