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부품번호 FAN1587AM33X 기능
기능 3A Adjustable/Fixed Low Dropout Linear Regulator
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FAN1587AM33X 데이터시트, 핀배열, 회로
www.fairchildsemi.com
FAN1587A
3A Adjustable/Fixed Low Dropout Linear Regulator
Features
• Fast transient response
• Low dropout voltage at up to 3A
• Load regulation: 0.05% typical
• Trimmed current limit
• On-chip thermal limiting
• Standard TO-220, TO-263, TO-263 center cut,
and TO-252 packages
Applications
• Pentium® Class GTL+ bus supply
• Low voltage logic supply
• Post regulator for switching supply
• 12V to 5V linear regulator
• 3.3V to 1.5V linear regulator
Description
The FAN1587A, FAN1587A-1.5, and FAN1587A-3.3 are low
dropout three-terminal regulators with 3A output current capa-
bility. These devices have been optimized for low voltage
applications including VTT bus termination, where transient
response and minimum input voltage are critical. The
FAN1587A is ideal for low voltage microprocessor applica-
tions requiring a regulated output from 1.5V to 3.6V with an
input supply of 12V or less. The FAN1587A-1.5 offers fixed
1.5V with 3A current capability for GTL+ bus VTT termina-
tion. The FAN1587A-3.3 offers fixed 3.3V current capability
for logic IC operation.
Current limit is trimmed to ensure specified output current and
controlled short-circuit current. On-chip thermal limiting pro-
vides protection against any combination of overload and
ambient temperature that would create excessive junction
temperatures.
The FAN1587A, FAN1587A-1.5, and FAN1587A-3.3 are
available in the industry-standard TO-220, TO-263, TO-263
center cut, and TO-252 (DPAK) power packages.
Typical Applications
VIN = 12V
22µF
+
FAN1587A
VIN VOUT
ADJ
VOUT = VREF (1+R2/R1)+IADJ*R2
VIN = 9V
22µF
+
FAN1587A-3.3
VIN VOUT
GND
R1
124
R2
768
9V at 3A
+
22µF
3.3V at 3A
+
22µF
65-1587-16
Pentium is a registered trademark of Intel Corporation.
REV. 1.0.5 11/10/03




FAN1587AM33X pdf, 반도체, 판매, 대치품
PRODUCT SPECIFICATION
FAN1587A
Electrical Characteristics
Tj = 25°C unless otherwise specied.
The denotes specications which apply over the specied operating temperature range.
Parameter
Reference Voltage3
Output Voltage4, 6
Output Voltage5, 6
Line Regulation1, 2
Load Regulation1, 2
Dropout Voltage
Current Limit
Adjust Pin Current3
Adjust Pin Current
Change3, 6
Minimum Load Current
Quiescent Current
Ripple Rejection
Thermal Regulation
Temperature Stability
Long-Term Stability
RMS Output Noise
(% of VOUT)
Thermal Resistance,
Junction to Case
Thermal Shutdown
Conditions
1.5V (VIN VOUT) 8.25V,
10mA IOUT 3A
3.0V VIN 8.5V
10mA IOUT 3A
4.8V VIN 10.3V
10mA IOUT 3A
(VOUT + 1.5V) VIN 12V,
IOUT = 10mA
(VIN VOUT) = 3V
10mA IOUT 3A
VREF = 1%, IOUT = 3A
(VIN VOUT) = 2V
1.5V (VIN VOUT) 12V,
10mA IOUT 3A
1.5V (VIN VOUT) 12V
VIN = 5V
f = 120Hz, COUT = 22µF Tantalum,
(VIN VOUT) = 3V, IOUT = 3A
TA = 25°C, 30ms pulse
TA = 125°C, 1000 hrs.
TA = 25°C, 10Hz f 10kHz
Min.
1.225
(-2%)
1.47
3.234
3.1
10
60
Typ.
1.250
1.5
3.3
0.005
0.05
1.150
4
35
0.2
4
72
0.004
0.5
0.03
0.003
Max
1.275
(+2%)
1.53
3.366
0.2
0.5
1.300
120
5
13
0.02
1.0
Units
V
V
V
%
%
V
A
µA
µA
mA
mA
dB
%/W
%
%
%
TO-220
TO-263, TO-252
3 °C/W
3 °C/W
150 °C
Notes:
1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are
measured at a constant junction temperature by low duty cycle pulse testing.
2. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is determined by
input/output differential and the output currrent. Guaranteed maximum output power will not be available over the full input/
output voltage range.
3. FAN1587A only.
4. FAN1587A-1.5 only.
5. FAN1587A-3.3 only.
6. Output current must be limited to meet the absolute maximum ratings of the part.
REV. 1.0.5 11/10/03
4

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FAN1587AM33X 전자부품, 판매, 대치품
PRODUCT SPECIFICATION
FAN1587A
Applications Information
General
The FAN1587A, FAN1587A-1.5, and FAN1587A-3.3 are
three-terminal regulators optimized for GTL+ VTT termina-
tion 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 FAN1587A
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+.
D1
1N4002
(OPTIONAL)
FAN1587A
VIN + IN OUT
C1 ADJ
22µF
+
CADJ
+
R1
VOUT
C2
22µF
R2
Stability
The FAN1587A series require 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 capacitors. It is recommended to use bypass capacitors
such as a 22µF tantalum or a 100µF aluminum on the adjust
pin of the FAN1587A for low ripple and fast transient
response. When these bypassing capacitors are not used at
the adjust pin, larger values of output capacitors provide
equally good results. Refer to Typical Performance Charac-
teristics for graph of stability of output capacitance ESR vs
load current.
Protection Diodes
In normal operation, the FAN1587A series does not require
any protection diodes. For the FAN1587A, internal resistors
limit internal current paths on the adjust pin. Therefore, even
with bypass capacitors on the adjust pin, no protection diode
is needed to ensure device safety under shortcircuit condi-
tions.
A protection diode between the input and output pins is usu-
ally not needed. An internal diode between the input and out-
put pins on the FAN1587A series can handle microsecond
surge currents of 50A to 100A. Even with large value output
capacitors it is difficult to obtain those values of surge cur-
rents in normal operation. Only with large values of output
capacitance, such as 1000µF to 5000µF, and with the input
pin instantaneously shorted to ground can damage occur. A
crowbar circuit at the input can generate those levels of cur-
rent; a diode from output to input is then recommended, as
shown in Figure 11. Usually, normal power supply cycling or
system “hot plugging and unplugging” will not generate
current large enough to do any damage.
The adjust pin can be driven on a transient basis ±7V with
respect to the output, without any device degradation. As
with any IC regulator, exceeding the maximum input-to-
output voltage differential causes the internal transistors to
break down and none of the protection circuitry is then
functional.
D1
1N4002
(OPTIONAL)
VIN +
C1
22µF
FAN1587A-1.5, -3.3
IN OUT
GND
+ VOUT
C2
22µF
65-1587-13
Figure 11. Optional Protection
Ripple Rejection
In applications that require improved ripple rejection, a
bypass capacitor from the adjust pin of the FAN1587A to
ground reduces the output ripple by the ratio of VOUT/1.25V.
The impedance of the adjust pin capacitor at the ripple fre-
quency should be less than the value of R1 (typically in the
range of 100to 120) in the feedback divider network in
Figure 11. Therefore, the value of the required adjust pin
capacitor is a function of the input ripple frequency. For
example, if R1 equals 100and the ripple frequency equals
120Hz, the adjust pin capacitor should be 22µF. At 10kHz,
only 0.22µF is needed.
Output Voltage
The FAN1587A regulator develops a 1.25V reference volt-
age between the output pin and the adjust pin (see Figure
12). Placing a resistor R1 between these two terminals
causes a constant current to flow through R1 and down
through R2 to set the overall output voltage. Normally, this
current is the specified minimum load current of 10mA.
The current out of the adjust pin adds to the current from R1
and is typically 35µA. Its output voltage contribution is
small and only needs consideration when very precise output
voltage setting is required.
REV. 1.0.5 11/10/03
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부품번호상세설명 및 기능제조사
FAN1587AM33X

3A Adjustable/Fixed Low Dropout Linear Regulator

Fairchild Semiconductor
Fairchild Semiconductor

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