FAN1581 Datasheet, PDF (2/13 Pages) Fairchild Semiconductor – 5A Adjustable/Fixed Ultra Low Dropout Linear Regulator

FAN1581
Pin Assignments
FAN1581M-1.2,
-1.5, -2.5
FRONT VIEW
FAN1581M
FRONT VIEW
FAN1581D
FRONT VIEW
FAN1581D-1.2,
-1.5, -2.5
FRONT VIEW
PRODUCT SPECIFICATION
FAN1581T
FRONT VIEW
1 2 3 45 1 2 3 45
1 2 3 45 1 2 3 45
12 3 45
5-Lead Plastic TO-263
Θ_JC=3°C/W*
Tab is out.
5-Lead Plastic TO-252 DPAK
Θ_JC=3°C/W*
Tab is out.
5-Lead TO-220
Θ_JC=3°C/W* Tab is VOUT.
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, θ_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 Definitions
Pin
Number Pin Name
1
VSense
2
ADJ/GND
3
VOUT
4
VCNTL
5
VIN
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 FAN1581-1.2, -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.
Internal Block Diagram
4
V_CNTL, Control
Thermal
Shutdown
Current
Limit
Vref
Voltage Loop
Amplifier
2
5 _{Vin, Power}
3 Output
1 Sense
2 _Adj
REV. 1.2.0 11/6/03