FAN1582T-25 [FAIRCHILD]
Regulator, 1 Output, BIPolar,;
| 型号： | FAN1582T-25 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Regulator, 1 Output, BIPolar, |
| 文件： | 总10页 (文件大小：568K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2007
FAN1582
3A Adjustable / Fixed Ultra Low Dropout Linear
Regulator
Features
Description
■ Ultra low dropout voltage, 0.4V typical at 3A
■ Remote sense operation
■ Fast transient response
The FAN1582, FAN1582-1.5, and FAN1582-2.5 are ultra
low dropout regulators with 3A output current capability.
These devices are optimized for low-voltage applica-
tions, including VTT bus termination, where transient
response and minimum input voltage are critical. The
FAN1582 is ideal for low-voltage microprocessor appli-
cations requiring a regulated output from 1.3V to 5.7V
with a power input supply of 1.75V to 6.5V.
■ Load regulation: 0.05% typical
■ 0.5% initial accuracy
■ On-chip thermal limiting
■ 5-pin TO-263 package
The FAN1582-1.5 offers fixed 1.5V with 3A current capa-
bilities for GTL+ bus VTT termination.
Applications
■ Support of GTL+ bus supply
■ Low voltage logic supply
■ Embedded processor supplies
■ Split plane regulator
The FAN1582-2.5 offers fixed 2.5V with 3A current capa-
bility for logic IC operation and processors while minimiz-
ing the overall power dissipation.
Current limit ensures controlled short-circuit current. On-
chip thermal limiting provides protection against combi-
nation of overload and ambient temperature that would
create excessive junction temperatures.
■ 2.5V, and 1.8V logic families
■ DDR termination supply
The FAN1582 is available in a 5-pin TO-263 power package.
Ordering Information
Operating
Part Number
FAN1582MX
Package
5-Pin TO-263
5-PinTO-263
5-Pin TO-263
Pb-Free
Yes
Temperature Range
Packing Method
Tape and Reel
Tape and Reel
Tape and Reel
-65 to 150°C
FAN1582M15X
FAN1582M25X
Yes
-65 to 150°C
Yes
-65 to 150°C
V
= 3.3V
V
VSENSE
IN
IN
+
+
10F
FAN1582–2.5
VOUT
2.5Vat 3A
V
= 3.3V
VCNTL
GND
VCNTL = 5V
1F
V
VSENSE
IN
+
IN
+
22F
10F
FAN1582
VOUT
2.1Vat 3A
VCNTL = 5V
VCNTL
+
22F
124
Adj
V
= 5.75V
V
VSENSE
IN
IN
+
10F
FAN1582
VOUT
86.6
5Vat 3A
VCNTL = 12V
VCNTL
+
22F
124
374
Adj
Figure 1. Typical Application
®
Pentium® is a registered trademark of Intel corportaion. PowerPC™ is a trademark of IBM Corporation.
© 2003 Fairchild Semiconductor Corporation
FAN1582 Rev. 1.1.4
www.fairchildsemi.com
Block Diagram
4
VCNTL, Control
5
3
V
, Power
IN
Thermal
Shutdown
Current
Limit
Output
1
Sense
Adj
Voltage Loop
Amplifier
VREF
2
Figure 2. Applications Diagram
Pin Assignments
FRONT VIEW
FRONT VIEW
1
2
3
4 5
1 2 3 4 5
5-Lead Plastic TO-263
JC=3°C/W*
Tab is out.
Q
*With package soldered to 0.5 square inch copper area over backside ground plane or internal
power plane, qJA 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.
Figure 3. 5-Lead TO-263 Pin Assignments
Pin Definitions
Pin #
Name
Description
Remote Voltage Sense. Connect this pin to the load to permit true remote sensing
and avoid trace drops.
1
VSense
Adjust or Ground. On the FAN1582, this pin forms the feedback to determine the out-
put voltage. On the FAN1582-1.5 and -2.5, connect this pin to ground.
2
3
4
5
ADJ/GND
VOUT
VCNTL
VIN
Output Voltage. This pin and the tab are output.
Control Voltage. This pin draws small signal power to control the FAN1582 circuitry.
Connect to a voltage higher than VIN, as shown in Figure 1.
Input Voltage.
© 2003 Fairchild Semiconductor Corporation
FAN1582 Rev. 1.1.4
www.fairchildsemi.com
2
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only.
Symbol
VIN
Parameter
Min.
Max.
7
Unit
V
Input Voltage
VCNTL
TJ
Control Voltage
13.2
125
300
150
V
Operating Junction Temperature Range
Lead Temperature (soldering, 10 seconds)
Storage Temperature Range
0
°C
°C
°C
TL
TSTG
-65
Electrical Characteristics
TJ=25°C, VOUT = VS, VADJ = 0V unless otherwise specified. The • denotes specifications that apply over the specified
operating temperature range.
Symbol
Parameter
Reference Voltage(1)
Condition
Min.
Typ.
Max. Units
VIN = 2.0V, VCNTL = 2.75V, IOUT = 10mA
1.243
1.250
1.257
V
2.05V ≤ VIN ≤ 5.5V,
2.7V ≤ VCNTL ≤ 12V,
10mA ≤ IOUT ≤ 3A
VREF
Reference Voltage(1)
•
•
1.237
1.250
1.263
V
3V ≤ VIN ≤ 7V (Function of VOUT),
10mA ≤ IOUT ≤ 3A
VADJ
Adjustable Output Voltage
VREF
1.5
5.7
V
Output Voltage(2)
Output Voltage (3)
3V ≤ VIN ≤ 7V, 10mA ≤ IOUT ≤ 3A
5.1V ≤ VIN ≤ 7V, 10mA ≤ IOUT ≤ 3A
1.75V ≤ VIN ≤ 5.5V, 2.5V ≤ VCNTL ≤ 12V,
•
•
1.47
1.5
2.5
1.53
V
V
VOUT
2.474
2.526
REG(LINE) Line Regulation(4)(5)
•
•
•
1
1
3
5
mV
mV
V
I
OUT = 10mA
VIN = 2.1V, VCNTL = 2.75V,
10mA ≤ IOUT ≤ 3A
REG(LOAD) Load Regulation(4)(5)
Dropout Voltage Minimum
V
IN = 2.05V, ΔVREF = 1%, IOUT = 3A
1.05
0.4
0.5
1.18
0.5
0.6
(VCNTL–VOUT
Dropout Voltage Minimun
(VIN–VOUT
)
VCNTL = 2.75V, ΔVREF = 1%,
OUT = 3A
VCNTL = 2.75V, ΔVREF = 1%,
VD
V
)
I
Dropout Voltage MinimunVIN
•
V
I
OUT = 3A
IS
Current Limit
VIN = 2.05V, VCNTL = 2.75V
VIN = 2.05V, VCNTL = 2.75V, IOUT = 10mA
VIN = 2.05V, VCNTL = 2.75V
VIN = 3.3V, VCNTL = 5V
•
•
•
•
3.1
60
A
ICNTL
IADJ
IMIN
Control Pin Current
Adjust Pin Current(1)
Minimum Load Current
2
6
mA
µA
mA
50
5.0
120
10
VIN = 3.75V, VCNTL = 3.75V,f=120HZ,
RA
Ripple Rejection
80
dB
C
OUT = 22µF Tantalum, IOUT = 1.5A
Thermal Resitance
Thermal Regulation
Thermal Shutdown
Junction-to-Case
3
°C/W
%/W
°C
TA = 25°C, 30ms Pulse
0.002
150
0.02
θJC
TSD
Notes:
1. FAN1582 only.
2. FAN1582-1.5 only.
3. FAN1582-2.5 only.
4. 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.
5. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is deter-
mined by input/output differential and the output current. Guaranteed maximum output power is not available over
the full input/output voltage range.
© 2003 Fairchild Semiconductor Corporation
FAN1582 Rev. 1.1.4
www.fairchildsemi.com
3
Typical Performance Characteristics
0.8
0.7
0.6
0.5
0.10
0.05
ΔΙ=3A
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
OUTPUT CURRENT (A)
JUNCTION TEMPERATURE (°C)
Figure 4. Dropout Voltage vs. Output Current
Figure 5. Load Regulation vs. Temperature
2.60
1.30
1.28
1.26
1.24
1.22
1.20
2.5V
1.5V
2.35
2.10
1.85
1.60
1.35
1.10
-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)
Figure 6. Reference Voltage vs. Temperature
Figure 9. Output Voltage vs. Temperature
70
10
60
50
40
8
6
4
2
0
30
20
10
0
-75 -50 -25
0
25 50
75 100 125 150
175
-75 -50 -25
0
25 50 75 100 125 150
1
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Figure 10. Minimum Load Current vs. Temperature
Figure 11. Adjust Pin Current vs. Temperature
© 2003 Fairchild Semiconductor Corporation
FIN1582 Rev. 1.1.4
www.fairchildsemi.com
4
Typical Performance Characteristics (Continued)
11
3.5
3.0
10mA Load
9
7
5
3
2.5
2.0
1.5
1.0
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)
Figure 12. Control Pin Current vs. Temperature
Figure 13. Short-Circuit Current vs. Temperature
90
80
70
60
50
40
30
20
15
10
5
0
(VIN—VOUT
) 3V
20
0.5V VRIPPLE 2V
10
0
IOUT = 5A
25
45
65
85
105
125
10
100
1K
10K
100K
FREQUENCY (HZ)
CASE TEMPERATURE
Figure 14. Ripple Rejection vs. Frequency
Figure 15. 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
Figure 16. Stability
© 2003 Fairchild Semiconductor Corporation
FIN1582 Rev. 1.1.4
www.fairchildsemi.com
5
Detailed Operation
The FAN1582, FAN1582-1.5, and FAN1582-2.5 are
three-terminal regulators optimized for GTL+ VTT termina-
tion and logic applications. These devices are short-cir-
cuit protected and offer thermal shutdown to turn off the
regulator when the junction temperature exceeds
~150°C. The FAN1582 series provides low dropout volt-
age and fast transient response. Frequency compensa-
tion uses capacitors with low ESR while maintaining
stability. This is critical in addressing the needs of low-
voltage, high-speed microprocessor busses like GTL+.
A protection diode between the input and output pins is
usually 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 currents 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. Because a crowbar circuit at
the input can generate those levels of current, a diode from
output to input is recommended, as shown in Figure 16.
Usually, normal power supply cycling or system “hot
plugging and unplugging” does not generate current
large enough to cause damage.
V
and V
Functions
CNTL
IN
The FAN1582 utilizes a dual-supply approach to maxi-
mize efficiency. The collector of the power device is
brought out to the VIN pin to minimize internal power dis-
sipation under high-current loads. VCNTL provides power
for the control circuitry and the drive for the output NPN
transistor. VCNTL should be at least 1.2V higher than the
output voltage. Special care was taken to ensure there
are no supply-sequencing problems. The output voltage
does not turn on until both supplies are operating. If the
control voltage comes up first, the output current is typi-
cally limited to about 3.0mA until the power input voltage
comes up. If the power input voltage comes up first, the
output does not turn on until the control voltage comes
up. The output can never come up unregulated.
D1
1N4002
(OPTIONAL)
VOUT
VCNTL VSENSE
VIN
VOUT
C2
22F
FAN1582
+
+
C1
10F
VIN Adj VOUT
R1
R2
+
CADJ
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.
D1
1N4002
(OPTIONAL)
Stability
VCNTL
VIN
VCNTL VSENSE
FAN1582–1.5, 2.5
VIN Gnd VOUT
VOUT
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 electro-
lytic on the output to ensure stability. The frequency com-
pensation of these devices optimizes the frequency
response with low-ESR capacitors. In general, it is sug-
gested 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. If
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 is shown in Figure 16.
+
+
C1
10F
C2
22F
Figure 17. 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 (typ-
ically in the range of 100Ω to 120Ω) in the feedback
divider network in Figure 17. Therefore, the value of the
required adjust pin capacitor is a function of the input rip-
ple frequency. For example, if R1 equals 100Ω and the rip-
ple 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 resis-
tors limit internal current paths on the adjust pin. There-
fore, even with bypass capacitors on the adjust pin, no
protection diode is needed to ensure device safety under
short-circuit conditions.
© 2003 Fairchild Semiconductor Corporation
FIN1582 Rev. 1.1.4
www.fairchildsemi.com
6
Output Voltage
The FAN1582 regulator develops a 1.25V reference volt-
age between the output pin and the adjust pin (see Fig-
ure 18). 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 cur-
rent of 10mA.
from junction-to-ambient. These sources include the junc-
tion-to-case resistance, the case-to-heat sink interface
resistance, and the heat sink resistance. Thermal resis-
tance specifications have been developed to more accu-
rately reflect device temperature and ensure safe
operating temperatures. The Electrical Characteristics
section provides a separate thermal resistance and max-
imum junction temperature for both the control circuitry
and the power transistor. Calculate the maximum junc-
tion temperature for both sections to ensure that both
thermal limits are met.
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
output voltage setting is required.
For example, look at using an FAN1582M-1.5 to gener-
ate 3A at 1.5V ± 2% from a 3.3V source (3.2V to 3.6V).
VCNTL
VSENSE
VCNTL
VIN
Assumptions:
FAN1582
Adj
■ VIN = 3.6V worst case
■ VOUT = 1.47V worst case
■ IOUT = 3A continuous
■ TA = 70°C
VOUT
VIN
+
+
VREF
C2
22F
C1
10F
R1
R2
IADJ
50A
■ ΘJCA = 5°C/W (assuming both a heatsink and a ther-
mally conductive material)
V
OUT = VREF (1+R2/R1) + IADJ (R2)
The power dissipation in this application is:
PD = (VIN - VOUT) * (IOUT) = (3.6-1.47) * (3) = 6.39W
From the specification table,
Figure 18. Basic Regulator Circuit
Load Regulation
TJ = TA+(PD) * (ΘCA+ΘJC) = 70+(6.39) * (5+3) = 121°C
The junction temperature is below the maximum rating.
The FAN1582 family provides true remote sensing, elim-
inating 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 one inch away from the FAN1582, it may be neces-
sary to increase the load capacitance to ensure stability.
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 to the heat sink. Use of a thermally conductive
material at the case-to-heat sink interface is recom-
mended. Use a thermally conductive spacer if the case
of the device must be electrically isolated and include its
contribution to the total thermal resistance.
Thermal Considerations
The FAN1582 series protect themselves under overload
conditions with internal power and thermal limiting cir-
cuitry. However, for normal continuous load conditions, do
not exceed maximum junction temperature ratings. It is
important to consider all sources of thermal resistance
U1
VIN = 3.3V
VIN
VSENSE
+
10F
C1
FAN1582
VOUT
2.1V at 3A
VCNTL
VCNTL = 5V
+
R1
R2
100F
C2
1F
C4
Adj
124
10F
C3
86.6
Figure 19. Application Circuit (FAN1582)
© 2003 Fairchild Semiconductor Corporation
FIN1582 Rev. 1.1.4
www.fairchildsemi.com
7
Table 1. Bill of Materials for Application Circuit for the FAN1582
Item
C1, C3
C2
Quantity
Manufacturer
Part Number
L10V10
Description
10µF, 10V Aluminum
100µF, 10V Aluminum
1µF Ceramic
2
1
1
1
1
1
Xicon
Xicon
L10V100
C4
Any
R1
Generic
124Ω, 1%
R2
Generic
86.6Ω, 1%
U1
Fairchild Semiconductor
FAN1582P
3A Regulator
U1
VIN = 2.5V
VIN
VSENSE
+
10F
C1
FAN1582–1.5
VOUT
1.5V at 3A
VCNTL
VCNTL = 3.3V
1F
+
100F
C3
GND
C2
Figure 20. Application Circuit (FAN1582-1.5)
Table 2. Bill of Materials for Application Circuit for the FAN1582-1.5
Item
C1
Quantity
Manufacturer
Part Number
Description
10µF, 10V Aluminum
1µF Ceramic
1
1
1
1
Xicon
L10V10
C2
Any
Xicon
C3
L10V100
100µF, 10V Aluminum
3A Regulator
U1
Fairchild Semiconductor
FAN1582P-1.5
U1
VIN = 3.3V
VIN
VSENSE
+
+
10F
C1
FAN1582–2.5
VOUT
2.5V at 3A
VCNTL
VCNTL = 5V
+
100F
C3
GND
1F
C2
Figure 21. Application Circuit (FAN1582-2.5)
Table 3. Bill of Materials for Application Circuit for the FAN1582-2.5
Item
C1
Quantity
Manufacturer
Part Number
Description
10µF, 10V Aluminum
1µF Ceramic
1
1
1
1
Xicon
L10V10
C2
Any
Xicon
C3
L10V100
100µF, 10V Aluminum
3A Regulator
U1
Fairchild Semiconductor
FAN1582P-2.5
© 2003 Fairchild Semiconductor Corporation
FIN1582 Rev. 1.1.4
www.fairchildsemi.com
8
Mechanical Dimensions
Dimensions are in millimeters unless otherwise noted.
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
Figure 22. 5-Lead TO-263 Package
© 2003 Fairchild Semiconductor Corporation
FIN1582 Rev. 1.1.4
www.fairchildsemi.com
9
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2.
A critical component is 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.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
This datasheet contains the design specifications for product development.
Specifications may change in any manner without notice.
Advance Information
Formative or In Design
This datasheet contains preliminary data; supplementary data will be pub-
lished at a later date. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve design.
Preliminary
First Production
Full Production
Not In Production
This datasheet contains final specifications. Fairchild Semiconductor reserves
the right to make changes at any time without notice to improve design.
No Identification Needed
Obsolete
This datasheet contains specifications on a product that has been discontin-
ued by Fairchild semiconductor. The datasheet is printed for reference infor-
mation only.
Rev. I24
© 2003 Fairchild Semiconductor Corporation
FAN1582 Rev. 1.1.4
www.fairchildsemi.com
10
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