FAN1582_0311 [FAIRCHILD]
3A Adjustable/Fixed Ultra Low Dropout Linear Regulator; 3A可调/固定超低压降线性稳压器
| 型号： | FAN1582_0311 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | 3A Adjustable/Fixed Ultra Low Dropout Linear Regulator |
| 文件： | 总11页 (文件大小：79K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN1 5 8 2
3 A Ad ju s t a b le /Fix e d Ult ra Lo w Dro p o u t
Lin e a r Re g u la t o r
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
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.
• 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 TO-252 DPAK, and TO-263 packages
Applications
• Support of GTL+ bus supply
• Low voltage logic supply
• Embedded Processor supplies
• Split plane regulator
• 2.5V, and 1.8V Logic Families
• DDR Termination Supply
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
TO-252 DPAK, and TO-263 power packages.
Typical Applications
VIN = 3.3V
10µF
VIN
VSENSE
+
+
FAN1582–2.5
VOUT
2.5V at 3A
VIN = 3.3V
VCNTL = 5V
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. 1.1.3 11/9/03
FAN1582
PRODUCT SPECIFICATION
Pin Assignments
FAN1582M-1.5, -2.5
FRONT VIEW
FAN1582M
FAN1582D
FAN1582D-1.5, -2.5
FRONT VIEW
FRONT VIEW
FRONT VIEW
1
2
3
4
5
1
2
3
4
5
1
2
3
4 5
1 2 3 4 5
5-Lead Plastic TO-263
ΘJC=3°C/W*
5-Lead Plastic TO-252 DPAK
ΘJC=3°C/W*
Tab is out.
Tab is out.
*With package soldered to 0.5 square inch copper area over backside ground plane or internal
power plane, θJA can vary from 30 °C/W to more than 40 °C/W. Other mounting techniques
can provide a thermal resistance lower than 30 °C/W.
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. 1.1.3 11/9/03
PRODUCT SPECIFICATION
FAN1582
Absolute Maximum Ratings
Parameter
Min.
Max.
7
Unit
VIN
V
VCNTL
13.2
125
300
150
V
Operating Junction Temperature Range
Lead Temperature (Soldering, 10 sec.)
Storage Temperature Range
0
°C
°C
°C
-65
Electrical Characteristics
TJ=25°C, VOUT = VS, VADJ = 0V unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.
Parameter
Reference Voltage3
Conditions
Min.
Typ. Max. Units
VIN = 2.0V, VCNTL = 2.75V,
IOUT = 10mA
1.243 1.250 1.257
V
Reference Voltage3
2.05V ≤ VIN ≤ 5.5V,
2.7V ≤ VCNTL ≤ 12V,
10mA ≤ IOUT ≤ 3A
•
•
1.237 1.250 1.263
V
Adjustable Output Voltage
3V ≤ VIN ≤ 7V (function of Vout),
10mA ≤ IOUT ≤ 3A
Vref
1.5
5.7
V
Output Voltage4
Output Voltage5
Line Regulation1,2
3V ≤ VIN ≤ 7V, 10mA ≤ IOUT ≤ 3A
5.1V ≤ VIN ≤ 7V, 10mA ≤ IOUT ≤ 3A
•
•
•
1.47
1.5
2.5
1
1.53
2.526
3
V
V
2.474
1.75V ≤ VIN ≤ 5.5V, 2.5V ≤ VCNTL ≤ 12V,
mV
IOUT = 10mA
Load Regulation1,2
VIN = 2.1V, VCNTL = 2.75V,
•
•
1
5
mV
V
10mA ≤ IOUT ≤ 3A
Dropout Voltage Minimum
VIN = 2.05V, ∆VREF = 1%, IOUT = 3A
1.05
0.4
0.5
1.18
0.5
0.6
(VCNTL–VOUT
Dropout Voltage Minimum
(VIN–VOUT
)
VCNTL = 2.75V, ∆VREF = 1%,
IOUT = 3A
V
)
Dropout Voltage Minimum VIN
VCNTL = 2.75V, ∆VREF = 1%,
•
V
IOUT = 3A
Current Limit
VIN = 2.05V, VCNTL = 2.75V
•
•
3.1
60
A
Control Pin Current
VIN = 2.05V, VCNTL = 2.75V,
IOUT = 10mA
2
6
mA
Adjust Pin Current3
Minimum Load Current
Ripple Rejection
VIN = 2.05V, VCNTL = 2.75V
VIN = 3.3V, VCNTL = 5V
•
•
50
5.0
80
120
10
µA
mA
dB
VIN = 3.75V, VCNTL = 3.75V, f = 120Hz,
COUT = 22µF Tantalum, IOUT = 1.5A
Thermal Resistance, Junction to
Case
TO-263/TO-252
SPAK
3
2
°C/W
Thermal Regulation
Thermal Shutdown
TA = 25°C, 30ms pulse
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. 1.1.3 11/9/03
3
FAN1582
PRODUCT SPECIFICATION
Typical Perfomance Characteristics
0.8
0.7
0.10
0.05
∆Ι=3A
0.6
0.5
0
0.4
-0.05
-0.10
T=125°C
0.3
T=25°C
T=0°C
0.2
-0.15
-0.20
0.1
0.0
0
1
2
4
-50
-25
0
25
50
75
100 125 150
JUNCTION TEMPERATURE (°C)
OUTPUT CURRENT (A)
Dropout Voltage vs. Output Current
Load Regulation vs. Temperature
2.60
2.35
2.10
1.85
1.60
1.35
1.10
1.30
1.28
1.26
1.24
1.22
1.20
2.5V
1.5V
-75 -50 -25
0
25 50 75 100 125 150
-75 -50 -25
0
25 50 75 100 125 150
175
175
TJ (°C)
TJ (°C)
Reference Voltage vs. Temperature
Output Voltage vs. Temperature
70
60
50
40
10
8
6
4
2
0
30
20
10
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. 1.1.3 11/9/03
PRODUCT SPECIFICATION
FAN1582
Typical Perfomance Characteristics (continued)
3.5
3.0
2.5
2.0
1.5
1.0
11
10mA Load
9
7
5
3
0.5
0
-75 -50 -25
0
25 50 75 100 125 150 175
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Control Pin Current vs. Temperature
Short-Circuit Current vs.Temeperature
90
80
70
60
50
40
30
20
20
15
10
(VIN—VOUT) ≤ 3V
0.5V ≤ VRIPPLE ≤ 2V
IOUT = 5A
5
0
10
0
10
100
1K
10K
100K
25
45
65
85
105
125
FREQUENCY (HZ)
CASE TEMPERATURE
Ripple Rejection vs. Frequency
Maximum Power Dissipation
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
2
3
LOAD CURRENT, A
FAN1582 Stability
REV. 1.1.3 11/9/03
5
FAN1582
PRODUCT SPECIFICATION
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
currents in normal operation. Only with large values of out-
put 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.
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+.
D1
V
and V
Functions
CNTL
1N4002
(OPTIONAL)
IN
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.
VOUT
Vcntl
Vsense
VIN
VOUT
C2
22µF
FAN1582
+
+
C1
10µF
Vin Adj Vout
R1
R2
+
CADJ
D1
1N4002
(OPTIONAL)
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.
VCNTL
VIN
Vcntl
Vsense
VOUT
FAN1582–1.5, 2.5
+
+
C1
10µF
C2
22µF
Vin Gnd Vout
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 <0.3Ω. 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. A graph showing stability of output capacitance
ESR vs load current can be found under Typical Performance
Characteristics.
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 VOUT/1.25V. The
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
100Ω and the ripple frequency equals 120Hz, the adjust pin
capacitor should be 22µF. At 10kHz, only 0.22µF is needed.
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.
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.
A protection diode between the input and output pins is usu-
ally not needed. An internal diode between the input and the
6
REV. 1.1.3 11/9/03
PRODUCT SPECIFICATION
FAN1582
The current out of the adjust pin adds to the current from R1
and is typically 50µA. Its output voltage contribution is
small and only needs consideration when a very precise out-
put voltage setting is required.
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.
Vcntl Vsense
Vcntl
For example, look at using an FAN1582M-1.5 to generate
3A @ 1.5V ± 2% from a 3.3V source (3.2V to 3.6V).
FAN1582
VIN
Adj
Vout
VOUT
Vin
+
+
Assumptions:
VREF
C2
22µF
C1
10µF
R1
R2
• Vin = 3.6V worst case
• VOUT = 1.47V worst case
• IOUT = 3A continuous
IADJ
50µA
V
OUT = VREF (1+R2/R1) + IADJ (R2)
• TA = 70°C
• Θ Case-to-Ambient = 5°C/W (assuming both a heatsink and a
thermally conductive material)
Figure 2. Basic Regulator Circuit
Load Regulation
The power dissipation in this application is:
PD = (VIN - VOUT) * (IOUT) = (3.6-1.47) * (3) = 6.39W
From the specification table,
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.
TJ = TA + (PD) * (Θ Case-to-Ambient + ΘJC
)
= 70 + (6.39) * (5 + 3) = 121°C
Thermal Considerations
The junction temperature is below the maximum rating.
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
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.
U1
VIN = 3.3V
10µF
VIN
VSENSE
+
C1
FAN1582
VOUT
2.1V at 3A
+
VCNTL
VCNTL = 5V
R1
R2
100µF
1µF
C4
Adj
124Ω
C2
10µF
C3
86.6Ω
Figure 3. Application Circuit (FAN1582)
REV. 1.1.3 11/9/03
7
FAN1582
PRODUCT SPECIFICATION
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
124Ω, 1%
R2
86.6Ω, 1%
U1
FAN1582P
3A Regulator
U1
VIN = 2.5V
10µF
C1
VIN
VSENSE
+
FAN1582–1.5
VOUT
1.5V at 3A
VCNTL
VCNTL = 3.3V
1µF
+
100µF
C3
GND
C2
Figure 4. Application Circuit (FAN1582-1.5)
Table 2. Bill of Materials for Application Circuit for the FAN1582-1.5
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
FAN1582P-1.5
U1
VIN = 3.3V
VIN
VSENSE
+
+
10µF
C1
FAN1582–2.5
VOUT
2.5V at 3A
VCNTL
VCNTL = 5V
+
100µF
C3
GND
1µF
C2
Figure 5. Application Circuit (FAN1582-2.5)
Table 3. Bill of Materials for Application Circuit for the FAN1582-2.5
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
FAN1582P-2.5
8
REV. 1.1.3 11/9/03
PRODUCT SPECIFICATION
FAN1582
Mechanical Dimensions
5-Lead TO-263 Package
A
10.20
9.80
1.40
1.00
9.50 MIN
9.40
9.00
9.00 MIN
10.00
5.10
4.70
1
5
4.00 MIN
1.20 MIN
1.37
1.17
0.90
0.70
(1.28)
1.70
1.70
M
M
0.25
B A
6.80
6.80
LAND PATTERN RECOMMENDATION
–B–
4.70
4.30
(8.00)
(4.40)
1.40
1.14
R0.45
(1.75)
(0.90)
(6.80)
SEE
DETAIL A
15.60
15.00
5
1
NOTES: UNLESS OTHERWISE SPECIFIED
A) ALL DIMENSIONS ARE IN MILLIMETERS.
GAGE PLANE
R0.56
B) STANDARD LEAD FINISH: 200 MICROINCHES/
5.08 MICROMETERS MIN. LEAD/TIN 15/85
ON COPPER.
C) NO PACKAGE STANDARD REFERENCE AS
OF JUNE 2002.
0.75
0.45
0.25
D) DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M – 1982.
0.10 B
2.84
2.24
8°
0°
SEATING
PLANE
DETAIL A, ROTATED 90°
SCALE: 10X
REV. 1.1.3 11/9/03
9
FAN1582
PRODUCT SPECIFICATION
Mechanical Dimensions (continued)
5-Lead TO-252 Package
6.00 MIN
A
6.80
6.35
5.64
5.04
1.27
0.50
6.56 MIN
6.30
5.90
6.25
1.02
0.60
3.00 MIN
1
C
3
5
2
4
1
1.27
3.81
1.27
(0.44)
1.00
0.57±0.07
0.69±0.15
1.27
5.08
0.25 M A M C
LAND PATTERN RECOMMENDATION
B
2.40
2.18
0.60
0.40
(5.09)
(4.05)
10.42
9.20
SEE
DETAIL A
3
5
4
2
1
0.10 B
GAGE PLANE
0.60
0.40
0.51
(1.54)
NOTES: UNLESS OTHERWISE SPECIFIED
A) ALL DIMENSIONS ARE IN MILLIMETERS.
B) THIS PACKAGE CONFORMS TO JEDEC, TO-252,
ISSUE C, VARIATION AA, DATED NOV. 1999.
1.78
1.40
10°
0°
0.13 MAX
SEATING PLANE
(2.90)
DETAIL A
(ROTATED 90°)
SCALE: 2X
10
REV. 1.1.3 11/9/03
FAN1582
PRODUCT SPECIFICATION
Ordering Information
Product Number
FAN1582MX
Package
TO-263 in Tape and Reel
FAN1582DX
TO-252 DPAK in Tape and Reel
TO-263 in Tape and Reel
FAN1582M15X
FAN1582D15X
FAN1582M25X
FAN1582D25X
TO-252 DPAK in Tape and Reel
TO-263 in Tape and Reel
TO-252 DPAK in Tape and Reel
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
11/9/03 0.0m 002
Stock#DS30001584
2001 Fairchild Semiconductor Corporation
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