FAN1084D33 FAIRCHILD [Fairchild Semiconductor], FAN1084D33 Datasheet

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FAN1084D33

Manufacturer Part Number
FAN1084D33
Description
4.5A Adjustable/Fixed Low Dropout Linear Regulator
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
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
Applications
• Desktop PCs, RISC and embedded processors’ supply
• GTL, SSTL logic Reference bus supply
• Low voltage V
• 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
FAN1084
4.5A Adjustable/Fixed Low Dropout Linear Regulator
packages
CC
logic supply
V
IN = 3.3V
V
IN = 5V
10 F
10 F
+
+
V
V
FAN1084-1.5
IN
IN
FAN1084
ADJ
GND
V
V
OUT
OUT
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 V
response and minimum input voltage are critical. The
FAN1084 is ideal for low voltage microprocessor applica-
tions 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 V
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 industry-
standard TO-220, TO-263 center cut, and TO-252 (DPAK)
power packages.
124
124
+
22 F
1.5V at 4.5A
+
22 F
2.5V at 4.5A
TT
bus termination, where transient
www.fairchildsemi.com
REV. 1.0.8 11/10/03
TT

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FAN1084D33 Summary of contents

Page 1

FAN1084 4.5A Adjustable/Fixed Low Dropout Linear Regulator Features • Fast transient response • Low dropout voltage 4.5A • Load regulation: 0.5% typical • On-chip thermal limiting • Standard TO-220, TO-263 center cut, and TO-252 packages Applications • ...

Page 2

FAN1084 Pin Assignments † FAN1084M-3.3 FAN1084M-1.5 FAN1084M FRONT VIEW FRONT VIEW Tab is out GND IN ADJ IN 3-Lead Plastic TO-263 =3 C/W* JC *With package soldered to 0.5 square inch copper area over ...

Page 3

PRODUCT SPECIFICATION Electrical Characteristics Operating Conditions: 4.75 V < 5.25V Parameter Conditions 3 Reference Voltage Adj connected to ground Output Voltage I OUT 6 Output Voltage I OUT 1, 2 Line Regulation I OUT 1, 2 ...

Page 4

FAN1084 Typical Performance Characteristics (Continued) 1.5 1.4 1.3 1.2 1.1 1.0 T=0 C 0.9 T=125 C T=25 C 0.8 0.7 0.6 0 OUTPUT CURRENT (A) Figure 2. Dropout Voltage vs. Output Current 1.275 1.270 1.265 1.260 ...

Page 5

PRODUCT SPECIFICATION Typical Performance Characteristics 8.0 7.0 6.0 5.0 4.0 -75 -50 - 100 125 150 175 JUNCTION TEMPERATURE ( C) Figure 8. Short-Circuit Current vs. Temperature 2.5 2 1 REV. 1.0.8 ...

Page 6

FAN1084 Applications Information General The FAN1084, FAN1084-1.5, and FAN1084-3.3 are three- terminal regulators optimized for GTL+ V and logic applications. These devices are short-circuit pro- tected, and offer thermal shutdown to turn off the regulator when the junction temperature exceeds ...

Page 7

PRODUCT SPECIFICATION The current out of the adjust pin adds to the current from R1. Its output voltage contribution is small and only needs consid- eration when a very precise output voltage setting is required. FAN1084 V IN OUT IN ...

Page 8

FAN1084 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 ...

Page 9

PRODUCT SPECIFICATION Mechanical Dimensions 3-Lead TO-263 Center Cut Package Inches Millimeters Symbol Min. Max. Min. A .160 .190 4.06 b .020 .036 0.51 b2 .049 .051 1.25 c2 .045 .055 1.14 D .340 .380 8.64 E .380 .405 9.65 e ...

Page 10

FAN1084 Mechanical Dimensions 3-Lead TO-263 Package Inches Millimeters Symbol Min. Max. Min. A .160 .190 4.06 b .020 .036 0.51 b2 .049 .051 1.25 c2 .045 .055 1.14 D .340 .380 8.64 E .380 .405 9.65 e .100 BSC 2.54 ...

Page 11

PRODUCT SPECIFICATION Mechanical Dimensions 3-Lead TO-220 Package Inches Millimeters Symbol Min. Max. Min. A .140 .190 3.56 b .015 .040 .38 b1 .045 .070 1.14 c1 .014 .022 .36 øP .139 .161 3.53 D .560 .650 14.22 E .380 .420 ...

Page 12

FAN1084 Mechanical Dimensions 3-Lead TO-252 Package 6.73 6.35 5.46 5. (0.59) 0.89 0.54 4.57 0. SEE NOTE GAGE PLANE 0.61 0. 1.78 1.40 2.90 DETAIL A (ROTATED ...

Page 13

... TO-263 Center Cut FAN1084M33 TO-263 FAN1084T33 TO-220 FAN1084D33 TO-252 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; ...

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