FAIRCHILD FAN1084 free download

File name FAN1084.pdf

www.fairchildsemi.com FAN1084 4.5A Adjustable/Fixed Low Dropout Linear Regulator Features · · · · · Fast transient response Low dropout voltage at up to 4.5A Load regulation: 0.5% typical On-chip thermal limiting Standard TO-220, TO-263 center cut, and TO-252 packages Description The FAN1084, FAN1084-1.5, and FAN1084-3.3 are low dropout three-terminal regulators with 4.5A 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 FAN1084 is ideal for low voltage microprocessor applications requiring a regulated output from 1.5V to 3.6A with an input supply of 5V or less. The FAN1084-1.5 offers fixed 1.5V with 4.5A current capabilities for GTL+ bus VTT termination. The FAN1084-3.3 offers a fixed 3.3V output at 4.5A. On-chip thermal limiting provides protection against any combination of overload and ambient temperature that would create excessive junction temperatures. The FAN1084 series regulators are available in the industrystandard TO-220, TO-263 center cut, and TO-252 (DPAK) power packages. Applications · · · · · · · Desktop PCs, RISC and embedded processors' supply GTL, SSTL logic Reference bus supply Low voltage VCC logic supply Battery-powered circuitry Post regulator for switching supply Cable and ADSL modems' DSP core supply Set Top Boxes and Web Boxes modules' supply Application Diagrams VIN = 5V + 10µF VIN FAN1084 VOUT ADJ 124 + 2.5V at 4.5A 22µF 124 VIN = 3.3V + 10µF FAN1084-1.5 VIN VOUT GND + 1.5V at 4.5A 22µF REV. 1.0.6 11/18/02 FAN1084 PRODUCT SPECIFICATION Pin Assignments FAN1084T FRONT VIEW FAN1084T-3.3 FAN1084T-1.5 FRONT VIEW FAN1084M-3.3 FAN1084M-1.5 FRONT VIEW FAN1084M FRONT VIEW Tab is out. FAN1084D-3.3 FAN1084D-1.5 FAN1084D FRONT VIEW FRONT VIEW 1 Tab is out. 1 2 3 1 2 3 2 3 1 2 3 1 2 3 1 2 3 GND GND IN ADJ IN IN ADJ IN ADJ OUT IN GND OUT IN 3-Lead Plastic TO-263 JC=3°C/W* 3-Lead Plastic TO-252 JC=3°C/W* 3-Lead Plastic TO-220 JC=3°C/W* *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 may provide better power dissipation than 30°C/W. FAN1084M-3.3 also available with uncut center lead. Absolute Maximum Ratings Parameter VIN Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 seconds) 0 ­65 Min. Max. 7 125 150 300 Unit V °C °C °C 2 REV. 1.0.6 11/18/02 PRODUCT SPECIFICATION FAN1084 Electrical Characteristics Operating Conditions: 4.75 VIN < 5.25V, Tj = 25°C unless otherwise specified. Parameter Reference Voltage Output Voltage5 Output Voltage 6 3 Conditions Adj connected to ground, IOUT = 10mA IOUT = 10mA IOUT = 10mA IOUT = 10mA 10mA IOUT 4.5A VREF% = 2%, IOUT = 4.5A (VIN ­ VOUT) = 2V Min. 1.23 1.475 3.234 Typ. 1.250 1.5 3.3 0.5 0.5 Max 1.27 1.525 3.366 2 2.5 1.5 Units V V V % % V A Li