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What is FAN1582PX?

This electronic component, produced by the manufacturer "Fairchild Semiconductor", performs the same function as "3A Adjustable/Fixed Ultra Low Dropout Linear Regulator".


FAN1582PX Datasheet PDF - Fairchild Semiconductor

Part Number FAN1582PX
Description 3A Adjustable/Fixed Ultra Low Dropout Linear Regulator
Manufacturers Fairchild Semiconductor 
Logo Fairchild Semiconductor Logo 


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FAN1582
3A Adjustable/Fixed Ultra Low Dropout
Linear Regulator
Features
• Ultra Low dropout voltage, 0.4V typical at 3A
• Remote sense operation
• Fast transient response
• Load regulation: 0.05% typical
• 0.5% initial accuracy
• On-chip thermal limiting
• 5-Pin SPAK, TO-252 DPAK, and TO-263 packages
Applications
• Pentium® Processors
• PowerPC, 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
Description
The FAN1582, FAN1582-1.5, and FAN1582-2.5 are ultra-low
dropout regulators with 3A 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 FAN1582 is ideal
for low voltage microprocessor applications requiring a reg-
ulated output from 1.3V to 5.7V with a power input supply
of 1.75V to 6.5V. The FAN1582-1.5 offers fixed 1.5V with
3A current capabilities for GTL+ bus VTT termination. The
FAN1582-2.5 offers fixed 2.5V with 3A 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 FAN1582 series regulators are available in the 5-Pin
SPAK, TO-252 DPAK, and TO-263 power packages.
Typical Applications
VIN = 3.3V
10µF
+
VCNTL = 5V
VIN VSENSE
FAN1582
VCNTL
VOUT
Adj
VIN = 3.3V
10µF
+
124
2.1V at 3A
+
22µF
86.6
VCNTL = 5V
1µF
+
VIN = 5.75V
10µF
+
VCNTL = 12V
VIN VSENSE
FAN1582–2.5
VCNTL
VOUT
GND
VIN VSENSE
FAN1582
VCNTL
VOUT
Adj
2.5V at 3A
+
22µF
124
5V at 3A
+
22µF
374
Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
REV. 1.1.2 2/26/03

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FAN1582PX equivalent
PRODUCT SPECIFICATION
FAN1582
Typical Perfomance Characteristics (continued)
6
5
4
3
2
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Short-Circuit Current vs.Temeperature
20
90
90
70
60
50
40
30
20 (VINVOUT) 3V
0.5V VRIPPLE 2V
10 IOUT = 3A
0
10 100 1K 10K
FREQUENCY (HZ)
Ripple Rejection vs. Frequency
100K
15
10
5
0
25
45 65 85 105
CASE TEMPERATURE
Maximum Power Dissipation
125
General
The FAN1582, FAN1582-1.5, and FAN1582-2.5 are three-
terminal regulators optimized for GTL+ VTT termination and
logic applications. These devices are short-circuit protected,
and offer thermal shutdown to turn off the regulator when the
junction temperature exceeds about 150°C. The FAN1582
series provides low dropout voltage and fast transient
response. Frequency compensation uses capacitors with low
ESR while still maintaining stability. This is critical in
addressing the needs of low voltage high speed microproces-
sor buses like GTL+.
VIN and VCNTL Functions
The FAN1582 utilizes a dual supply approach to maximize
efficiency. The collector of the power device is brought out
to the VIN pin to minimize internal power dissipation under
high current loads. VCNTL provides power for the control
circuitry and the drive for the output NPN transistor. VCNTL
should be at least 1.2 V higher than the output voltage.
Special care was taken to ensure there are no supply-
REV. 1.1.2 2/26/03
sequencing problems. The output voltage will not turn on
until both supplies are operating. If the control voltage
comes up first, the output current will be typically limited to
about 3.0 mA until the power input voltage comes up. If the
power input voltage comes up first the output will not turn on
at all until the control voltage comes up. The output can
never come up unregulated.
The FAN1582 can also be used as a single supply device
with the control and power inputs tied together. In this mode,
the dropout is determined by the minimum control voltage.
Stability
The FAN1582 series requires an output capacitor as a part of
the frequency compensation. It is recommended to use a 22µF
solid tantalum or a 100µF aluminum electrolytic on the output
to ensure stability. The frequency compensation of these
devices optimizes the frequency response with low ESR capaci-
tors. In general, it is suggested to use capacitors with an ESR
of <0.3. It is also recommended to use bypass capacitors
such as a 22µF tantalum or a 100µF aluminum on the adjust
5


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