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PDF FAN1581 Data sheet ( Hoja de datos )
| Número de pieza | FAN1581 | |
| Descripción | 5A Adjustable/Fixed Ultra Low Dropout Linear Regulator | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FAN1581
5A Adjustable/Fixed Ultra Low Dropout
Linear Regulator
Features
• Ultra Low dropout voltage, 0.4V typical at 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
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
• DDR Termination Supply
Description
The FAN1581, FAN1581x12, FAN1581-1.5, and FAN1581-
2.5 are ultra-low dropout regulators with 5A output current
capability. These devices have been optimized for low volt-
age applications including VTT bus termination, where tran-
sient response and minimum input voltage are critical. The
FAN1581 is ideal for low voltage microprocessor applica-
tions requiring a regulated output from 1.3V to 5.7V with a
power input supply of 1.75V 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 exces-
sive junction temperatures.
The FAN1581 series regulators are available in the 5-pin
SPAK, TO-263, TO-252 and TO-220 packages.
Typical Applications
VIN = 3.3V
10µF
+
VCNTL = 5V
1µF
+
VIN VSENSE
FAN1581
VCNTL
VOUT
Adj
VIN = 3.3V
10µF
+
VCNTL = 5V
1µF
+
VIN VSENSE
FAN1581M12
VCNTL
VOUT
Adj
VIN = 3.3V
10µF
+
124Ω
86.6Ω
2.1V at 5A
+
22µF
VCNTL = 5V
1µF
+
VIN = 5.75V
10µF
+
VCNTL = 12V
1µF
+
VIN VSENSE
FAN1581–2.5
VCNTL
VOUT
GND
VIN VSENSE
FAN1581
VCNTL
VOUT
Adj
120Ω
1.2V at 5A
22µF
2.5V at 5A
+
22µF
124Ω
5V at 5A
+
22µF
374Ω
Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
REV. 1.1.8 4/7/03
1 page  
PRODUCT SPECIFICATION
FAN1581
Typical Perfomance Characteristics (continued)
11
9
7
5
3
-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 (VIN—VOUT) ≤ 3V
0.5V ≤ VRIPPLE ≤ 2V
10 IOUT = 5A
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 FAN1581, FAN1581x12, FAN1581-1.5, and
FAN1581-2.5 are three-terminal regulators optimized for
DDR and GTL+ VTT termination and logic applications.
These devices are short-circuit protected, and offer thermal
shutdown to turn off the regulator when the junction temper-
ature exceeds about 150°C. The FAN1581 series provides
low dropout voltage and fast transient response. Frequency
compensation uses capacitors with low ESR while still main-
taining stability. This is critical in addressing the needs of
low voltage high speed microprocessor buses like GTL+.
VIN and VCNTL Functions
The FAN1581 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 volt-
age. Special care was taken to ensure there are no supply-
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 FAN1581 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 FAN1581 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
REV. 1.1.8 4/7/03
5
5 Page 
FAN1581
Mechanical Dimensions (continued)
SPAK Package
PRODUCT SPECIFICATION
Symbol
A
B
b1
b2
C
c1
c2
D
E
e
L
L1
L2
L3
R
α
Inches
Min. Max.
0.350 0.360
0.220 NOM
0.268
0.025 0.031
0.070 0.080
0.040 0.050
0.010 NOM
0.295 NOM
0.365 0.375
0.067
0.410 0.420
0.031 0.041
0.350 0.360
0.310 0.320
0.010 NOM
0° 8°
Millimeters
Min. Max.
8.89 9.14
5.59 NOM
6.81
0.63 0.79
1.78 2.03
1.02 1.27
0.25 NOM
7.49 NOM
9.27 9.52
1.72
10.41 10.67
0.79 1.04
8.89 9.14
7.87 8.13
0.25 NOM
0° 8°
Notes
Notes:
1. All linear dimensions are in inches (millimeters).
2. This drawing is subject to change without notice.
3. The center lead is in electrical contact with the thermal tab.
4. Dimensions do not include mold protrusions, not to exceed 0.006 (0,15).
E
C
A c1
B c2
D
L
L2
L3
1
e
b1
5
b2
0.010 (0,25) M
Thermal Ta b
(See Note 3)
Seating Plane
0.004 (0,10)
0.005 (0.13)
0.001 (0.03)
R
Gage Plane
L1
3°–6°
11 REV. 1.1.8 4/7/03
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FAN1581.PDF ] | |
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