FAN1582T-2.5 [ETC]
Positive Fixed Voltage Regulator ; 正固定电压稳压器\n
| 型号： | FAN1582T-2.5 |
| 厂家： | 
ETC |
| 描述： | Positive Fixed Voltage Regulator
|
| 文件： | 总11页 (文件大小：143K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN1582
3A Adjustable/Fixed Ultra Low Dropout
Linear Regulator
Description
Features
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
• 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
including V bus termination, where transient response and
TT
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
• 5 Pin standard TO-220 and TO-263 packages
3A current capabilities for GTL+ bus V termination. The
TT
Applications
FAN1582-2.5 offers fixed 2.5V with 3A current capability
for logic IC operation and processors while minimizing the
overall power dissipation.
• Pentium® Processors
• PowerPC™, AMD K5 and K6 processors
• Pentium support of GTL+ bus supply
• Low voltage logic supply
• Embedded Processor supplies
• Split plane regulator
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.
• New 2.5V and 1.8V Logic Families
The FAN1582 series regulators are available in the industry-
standard 5-Pin TO-220 and TO-263 power packages.
Typical Applications
VIN = 3.0V
10µF
VIN
VSENSE
+
+
FAN1582–2.5
VOUT
2.5V at 3A
VIN = 3.3V
VCNTL = 3.3V
1µF
VCNTL
VIN
VSENSE
+
+
22µF
GND
10µF
FAN1582
VOUT
2.1V at 3A
VCNTL = 5V
VCNTL
+
22µF
124Ω
Adj
VIN = 5.75V
10µF
VIN
VSENSE
+
FAN1582
VOUT
86.6Ω
5V at 3A
VCNTL = 12V
VCNTL
+
22µF
124Ω
374Ω
Adj
Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
REV. 1.0.0 1/9/01
FAN1582
PRODUCT SPECIFICATION
Pin Assignments
FAN1582T
FAN1582T-1.5, -2.5
FRONT VIEW
FRONT VIEW
FAN1582M-1.5, -2.5
FAN1582M
FRONT VIEW
FRONT VIEW
1
2
3
4
5
1
2
3 4 5
1
2
3
4 5
1
2 3 4 5
S
OUT IN
Adj CNTL
S
OUT IN
S
OUT IN
S
OUT IN
Adj CNTL
GND CNTL
GND CNTL
5-Lead Plastic TP-263
ΘJC=3°C/W*
5-Lead Plastic TP-220
ΘJC=3°C/W*
*With package soldered to 0.5 square inch copper area over backside ground plane or internal
power plane. ΘJA can vary fom 20°C/W to >40°C/W with other mounting techniques.
Pin Definitions
Pin Number
Pin Name
Pin Function Descrition
VSense
Remote Voltage Sense. Connect this pin to the load to permit true
1
remote sensing and avoid trace drops.
ADJ/GND
Adjust or Ground. On the FAN1582, this pin forms the feedback to
determine the output voltage. On the FAN1582-1.5 and -2.5, connect this
pin to ground.
2
3
4
VOUT
Output Voltage. This pin and the tab are output.
VCNTL
Control Voltage. This pin draws small-signal power to control the
FAN1582 circuitry. Connect to a voltage higher than VIN, as shown in the
applications circuits.
5
VIN
Input Voltage.
Internal Block Diagram
4
VCNTL, Control
5
3
Vin, Power
Thermal
Shutdown
Current
Limit
Output
1
2
Sense
Adj
Voltage Loop
Amplifier
Vref
2
REV. 1.0.0 1/9/01
PRODUCT SPECIFICATION
FAN1582
Absolute Maximum Ratings
Parameter
Min.
Max.
7
Unit
V
V
V
IN
13.2
125
300
150
V
CNTL
Operating Junction Temperature Range
Lead Temperature (Soldering, 10 sec.)
Storage Temperature Range
0
°C
°C
°C
-65
Electrical Characteristics
T =25°C, V
= V , V
= 0V unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.
J
OUT
S
ADJ
Parameter
Reference Voltage3
Conditions
Min.
Typ. Max. Units
V
IN
= 2.0V, V
CNTL
= 2.75V,
1.243 1.250 1.257
V
I
= 10mA
OUT
Reference Voltage3
2.05V ≤ V ≤ 5.5V,
IN
•
•
1.237 1.250 1.263
V
2.7V ≤ V
10mA ≤ I
OUT
≤ 12V,
≤ 3A
CNTL
Adjustable Output Voltage
3V ≤ V ≤ 7V (function of Vout),
IN
Vref
1.5
5.7
V
10mA ≤ I
OUT
≤ 3A
Output Voltage4
Output Voltage5
Line Regulation1,2
3V ≤ V ≤ 7V, 10mA ≤ I
IN OUT
≤ 3A
≤ 3A
≤ 12V,
•
•
•
1.47
1.5
2.5
1
1.53
2.526
3
V
V
5.1V ≤ V ≤ 7V, 10mA ≤ I
IN OUT
2.474
1.75V ≤ V ≤ 5.5V, 2.5V ≤ V
IN CNTL
mV
I
= 10mA
OUT
Load Regulation1,2
V
= 2.1V, V
= 2.75V,
•
•
1
5
mV
IN
CNTL
≤ 3A
10mA ≤ I
OUT
Dropout Voltage Minimum V
Dropout Voltage Minimum V
V
V
= 2.05V, ∆V
REF
= 1%, I
OUT
= 3A
1.05
0.4
1.18
0.5
V
V
CNTL
IN
= 2.75V, ∆V
= 2.75V, ∆V
CNTL
= 1%,
IN
CNTL
REF
I
= 3A
OUT
Dropout Voltage Minimum V
V
= 1%,
•
0.5
30
0.6
V
IN
REF
I
= 3A
OUT
Current Limit
V
V
= 2.05V, V
= 2.75V
= 2.75V,
•
•
3.1
60
A
IN
CNTL
Control Pin Current
= 2.05V, V
120
µA
IN
CNTL
I
= 10mA
OUT
Adjust Pin Current3
Minimum Load Current
Ripple Rejection
V
IN
V
IN
V
IN
= 2.05V, V
= 2.75V
•
•
50
5.0
80
120
10
mA
mA
dB
CNTL
= 3.3V, V
CNTL
= 5V
= 3.75V, f = 120Hz,
= 1.5A
= 3.75V, V
CNTL
C
OUT
= 22µF Tantalum, I
OUT
Thermal Resistance, Junction to
Case
3
°C/W
Thermal Regulation
Thermal Shutdown
T = 25°C, 30ms pulse
A
0.002 0.02
150
%/W
°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 current. Guaranteed maximum output power will not be available over the full input/
output voltage range.
3. FAN1582 only.
4. FAN1582-1.5 only.
5. FAN1582-2.5 only.
REV. 1.0.0 1/9/01
3
FAN1582
PRODUCT SPECIFICATION
Typical Perfomance Characteristics
0.10
0.05
1.0
0.9
0.8
∆Ι=3A
0.7
0.6
0
T=0°C
0.5
-0.05
-0.10
0.4
T=25°C
T=125°C
0.3
0.2
0.1
0.0
-0.15
-0.20
0
0.5
1
1.5
2
2.5
3
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
OUTPUT CURRENT (A)
Dropout Voltage vs. Output Current
Load Regulation vs. Temperature
1.275
3.70
VOUT set with
1% resistors
1.270
1.265
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
3.65
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
Note:
1. FAN1582 Only
VOUT = 3.3V1
-75 -50 -25
0
25 50 75 100 125 150
-75 -50 -25
0
25 50 75 100 125 150
175
175
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Reference Voltage vs. Temperature
Output Voltage vs. Temperature
100
10
8
Note:
1. FAN1582 Only
90
80
70
60
50
40
30
20
10
0
6
4
2
0
-75 -50 -25
0
25 50 75 100 125 150
-75 -50 -25
0
25 50
75 100 125 150
175
175
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Mimimum Load Current vs. Temperature
Adjust Pin Current vs. Temperature
4
REV. 1.0.0 1/9/01
PRODUCT SPECIFICATION
FAN1582
Typical Perfomance Characteristics (continued)
90
90
70
60
50
40
30
20
6
5
4
3
2
(VIN—VOUT) ≤ 3V
0.5V ≤ VRIPPLE ≤ 2V
IOUT = 3A
10
0
-75 -50 -25
0
25 50 75 100 125 150 175
10
100
1K
FREQUENCY (HZ)
10K
100K
JUNCTION TEMPERATURE (°C)
Short-Circuit Current vs.Temeperature
Ripple Rejection vs. Frequency
20
15
10
5
0
25
45
65
85
105
125
CASE TEMPERATURE
Maximum Power Dissipation
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 <1Ω. It is also recommended to use bypass capacitors such
as a 22µF tantalum or a 100µF aluminum on the adjust pin of
the FAN1582 for low ripple and fast transient response. When
these bypassing capacitors are not used at the adjust pin, smaller
values of output capacitors provide equally good results.
General
The FAN1582, FAN1582-1.5, and FAN1582-2.5 are three-
terminal regulators optimized for GTL+ V termination and
TT
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+.
Protection Diodes
In normal operation, the FAN1582 series does not require any
protection diodes. For the FAN1582, 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 short-circuit conditions.
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
REV. 1.0.0 1/9/01
5
FAN1582
PRODUCT SPECIFICATION
A protection diode between the input and output pins is usu-
ally not needed. An internal diode between the input and the
output pins on the FAN1582 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 current;
a diode from output to input is then recommended, as shown
in Figure 1. Usually, normal power supply cycling or system
“hot plugging and unplugging” will not generate current
large enough to do any damage.
100Ω and the ripple frequency equals 120Hz, the adjust pin
capacitor should be 22µF. At 10kHz, only 0.22µF is needed.
Output Voltage
The FAN1582 regulator develops a 1.25V reference voltage
between the output pin and the adjust pin (see Figure 2).
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 a very precise out-
put voltage setting is required.
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.
Vcntl Vsense
Vcntl
FAN1582
VIN
C1
Adj
Vout
VOUT
Vin
+
+
VREF
D1
1N4002
(OPTIONAL)
C2
22µF
R1
R2
10µF
IADJ
50µA
VOUT
Vcntl
Vsense
VOUT = VREF (1+R2/R1) + IADJ (R2)
VIN
VOUT
C2
22µF
FAN1582
+
+
C1
10µF
Vin Adj Vout
Figure 2. Basic Regulator Circuit
R1
R2
Load Regulation
+
The FAN1582 family provides true remote sensing, eliminat-
ing output voltage errors due to trace resistance. To utilize
remote sensing, connect the VSENSE pin directly to the
load, rather than at the VOUT pin. If the load is more than 1"
away from the FAN1582, it may be necessary to increase the
load capacitance to ensure stability.
CADJ
D1
1N4002
(OPTIONAL)
Thermal Considerations
VCNTL
VIN
Vcntl
Vsense
The FAN1582 series protect themselves under overload con-
ditions with internal power and thermal limiting circuitry.
However, for normal continuous load conditions, do not exceed
maximum junction temperature ratings. It is important to
consider all sources of thermal resistance from junction-to-
ambient. These sources include the junction-to-case resistance,
the case-to-heat sink interface resistance, and the heat sink
resistance. Thermal resistance specifications have been
developed to more accurately reflect device temperature and
ensure safe operating temperatures. The electrical character-
istics section provides a separate thermal resistance and
maximum junction temperature for both the control circuitry
and the power transistor. Calculate the maximum junction
temperature for both sections to ensure that both thermal
limits are met.
VOUT
FAN1582–1.5, 2.5
+
+
C1
10µF
C2
22µF
Vin Gnd Vout
Figure 1. Optional Protection Diode
Ripple Rejection
In applications that require improved ripple rejection, a bypass
capacitor from the adjust pin of the FAN1582 to ground
reduces the output ripple by the ratio of V
impedance of the adjust pin capacitor at the ripple frequency
should be less than the value of R1 (typically in the range of
100Ω to 120Ω) in the feedback divider network in Figure 1.
Therefore, the value of the required adjust pin capacitor is a
function of the input ripple frequency. For example, if R1 equals
/1.25V. The
OUT
For example, look at using an FAN1582T-1.5 to generate 3A
@ 1.5V ± 2% from a 3.3V source (3.2V to 3.6V).
6
REV. 1.0.0 1/9/01
PRODUCT SPECIFICATION
FAN1582
Assumptions:
From the specification table,
T = T + (P ) * (Θ Case-to-Ambient + Θ )
JC
• V = 3.6V worst case
in
J
A
D
• V
• I
OUT
= 1.47V worst case
= 3A continuous
= 70 + (6.39) * (5 + 3) = 121°C
OUT
• T = 70°C
The junction temperature is below the maximum rating.
A
• Θ
= 5°C/W (assuming both a heatsink and
Case-to-Ambient
a thermally conductive material)
Junction-to-case thermal resistance is specified from the IC
junction to the bottom of the case directly below the die. This
is the lowest resistance path for heat flow. Proper mounting
ensures the best thermal flow from this area of the package to
the heat sink. Use of a thermally conductive material at the
case-to-heat sink interface is recommended. Use a thermally
conductive spacer if the case of the device must be electri-
cally isolated and include its contribution to the total thermal
resistance.
The power dissipation in this application is:
P
= (V - V
) * (I ) = (3.6-1.47) * (3) = 6.39W
OUT
D
IN OUT
U1
VIN = 3.3V
10µF
VIN
VSENSE
+
C1
FAN1582
VOUT
2.1V at 3A
+
VCNTL
VCNTL = 5V
R1
R2
100µF
86.6Ω
124Ω
1µF
C4
Adj
C2
10µF
C3
Figure 3. Application Circuit (FAN1582)
Table 1. Bill of Materials for Application Circuit for the FAN1582
Item
C1, C3
C2
Quantity
Manufacturer
Xicon
Part Number
L10V10
Description
10µF, 10V Aluminum
100µF, 10V Aluminum
1µF Ceramic
2
1
1
1
1
1
Xicon
L10V100
C4
Any
R1
Generic
Generic
Fairchild
86.6Ω, 1%
R2
124Ω, 1%
U1
FAN1582T
3A Regulator
REV. 1.0.0 1/9/01
7
FAN1582
PRODUCT SPECIFICATION
U1
VSENSE
VIN = 2.5V
10µF
C1
VIN
+
FAN1582–1.5
VOUT
1.5V at 3A
VCNTL
VCNTL = 3.3V
1µF
+
100µF
C3
Adj
C2
Figure 4. Application Circuit (FAN1582-1.5)
Table 2. Bill of Materials for Application Circuit for the RC1582-1.5
Item
C1
Quantity
Manufacturer
Xicon
Part Number
Description
1
1
1
1
L10V10
10µF, 10V Aluminum
1µF Ceramic
C2
Any
C3
Xicon
L10V100
100µF, 10V Aluminum
3A Regulator
U1
Fairchild
FAN1582T-1.5
U1
VIN = 2.5V
VIN
VSENSE
+
+
10µF
C1
FAN1582–2.5
VOUT
1.5V at 3A
VCNTL
VCNTL = 3.3V
+
100µF
C3
Adj
1µF
C2
Figure 5. Application Circuit (FAN1582-2.5)
Table 3. Bill of Materials for Application Circuit for the RC1582-2.5
Item
C1
Quantity
Manufacturer
Xicon
Part Number
Description
10µF, 10V Aluminum
1µF Ceramic
1
1
1
1
L10V10
C2
Any
C3
Xicon
L10V100
100µF, 10V Aluminum
3A Regulator
U1
Fairchild
FAN1582T-2.5
8
REV. 1.0.0 1/9/01
PRODUCT SPECIFICATION
FAN1582
Mechanical Dimensions
5-Lead TO-263 Package
Notes:
Symbol
Inches
Min.
Millimeters
1. Dimensions are exclusive of mold flash and metal burrs.
2. Standoff-height is measured from lead tip with ref. to Datum –B-.
3. Foot length is measured with ref. to Datum –A- with lead surface
(at inner R).
4. Dimension exclusive of dambar protrusion or intrusion.
5. Formed leads to be planar with respect to one another at seating
place –C-.
Max.
.405
.625
.380
.055
.039
.072
.055
.190
0.110
.029
.019
Min.
Max.
10.29
15.88
9.66
1.40
.99
A
.380
.575
.325
–
9.65
14.60
8.25
–
B
C
D
E
F
.020
.060
0.45
.160
.090
.018
.017
.50
1.52
1.14
4.06
2.28
.457
0.43
1.83
1.40
4.83
2.80
.736
0.48
G
H
J
K
R
A
D
G
C
E-PIN
B
R (2PLCS)
E
F
J
-B-
-A-
H
-C-
REV. 1.0.0 1/9/01
9
FAN1582
PRODUCT SPECIFICATION
Mechanical Demensions (continued)
5-Lead TO-220 Package
Inches
Millimeters
Symbol
Notes
Min.
Max.
Min.
Max.
A
.140
.025
.140
.139
.560
.190
.040
.220
.161
.650
3.56
.63
4.83
1.02
.559
4.09
16.51
b
c1
øP
D
E
.356
3.53
14.22
.380
.062
.420
.072
9.65
1.57
10.67
1.83
e
e1
F
.263
.045
.230
.080
.273
6.68
1.14
5.84
2.04
6.94
1.40
6.87
2.92
.055
.270
.115
H1
J1
L
.500
.100
3°
.580
.135
7°
12.70
.254
3°
14.73
.343
7°
Q
α
Notes:
1. Dimension c1 apply for lead finish.
H1
Q
L
e
e1
E
b
E-PIN
øP
α (5X)
c1
A
J1
F
D
10
REV. 1.0.0 1/9/01
FAN1582
PRODUCT SPECIFICATION
Ordering Information
Product Number
FAN1582M
Package
TO-263
TO-220
TO-263
TO-220
TO-263
TO-220
FAN1582T
FAN1582M-1.5
FAN1582T-1.5
FAN1582M-2.5
FAN1582T-2.5
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
1/9/01 0.0m 002
Stock#DS30001584
2001 Fairchild Semiconductor Corporation
相关型号：
FAN1585ADX_NL
Adjustable Positive LDO Regulator, 1.5V Min, 3.6V Max, 1.3V Dropout, PSSO3, LEAD FREE, PLASTIC, TO-252, 3 PIN
FAIRCHILD
FAN1585AM15X
1.5V FIXED POSITIVE LDO REGULATOR, 1.3V DROPOUT, PSSO3, PLASTIC, TO-263, 3 PIN
ROCHESTER
©2020 ICPDF网 联系我们和版权申明