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FAN1582M15X Datasheet(PDF) 5 Page - Fairchild Semiconductor

No. de pieza FAN1582M15X
Descripción Electrónicos  3A Adjustable/Fixed Ultra Low Dropout Linear Regulator
Download  12 Pages
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN1582M15X Datasheet(HTML) 5 Page - Fairchild Semiconductor

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PRODUCT SPECIFICATION
FAN1582
REV. 1.1.2 2/26/03
5
Typical Perfomance Characteristics (continued)
6
5
4
3
2
-75 -50 -25
25
50
75 100
125 150 175
20
25
45
65
85
105
125
15
10
5
0
0
JUNCTION TEMPERATURE (
°C)
CASE TEMPERATURE
FREQUENCY (HZ)
(VIN—VOUT) ≤ 3V
0.5V
≤ V
RIPPLE ≤ 2V
IOUT = 3A
90
90
70
60
50
40
30
20
10
0
10
100
1K
10K
100K
Short-Circuit Current vs.Temeperature
Ripple Rejection vs. Frequency
Maximum Power Dissipation
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-
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
Ω. It is also recommended to use bypass capacitors
such as a 22µF tantalum or a 100µF aluminum on the adjust


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