FAN1585A [FAIRCHILD]
5A Adjustable/Fixed Low Dropout Linear Regulator; 5A可调式/固定式低压降线性稳压器
| 型号： | FAN1585A |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | 5A Adjustable/Fixed Low Dropout Linear Regulator |
| 文件： | 总12页 (文件大小：65K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN1 5 8 5 A
5 A Ad ju s t a b le /Fix e d Lo w Dro p o u t Lin e a r Re g u la t o r
Features
Description
• Fast transient response
The FAN1585A, FAN1585A-1.5, and FAN1585A-1.8 are
low dropout three-terminal regulators with 5A output current
capability. These devices have been optimized for low volt-
• Low dropout voltage at up to 5A
• Load regulation: 0.05% typical
• Trimmed current limit
age applications includingV bus termination for FC-PGA,
TT
• On-chip thermal limiting
• Standard TO-220, TO-263 and TO-263 center cut packages
where transient response and minimum input voltage are
critical. The FAN1585A-1.5 offers fixed 1.5V with 5A
current capabilities for AGTL+ bus V termination for
TT
FC-PGA. The FAN1585A is ideal for low voltage micro-
processor applications requiring a regulated output from
1.5V to 3.6V with an input supply of 5V or less, or for
FC-PGA applications with significant trace resistance.
Applications
• AGTL+ bus supply for FC-PGA
• Low voltage logic supply
• Post regulator for switching supply
• 3.3V to 1.5V linear regulator
• 5V to 1.8V linear regulator
Current limit is trimmed to ensure specified output current
and controlled short-circuit current. On-chip thermal limit-
ing provides protection against any combination of overload
and ambient temperature that would create excessive junc-
tion temperatures.
The FAN1585A series regulators are available in the industry-
standard TO-220, TO-263 and TO-263 center cut power
packages.
Typical Applications
FAN1585A
V
IN
V
OUT
V
IN
= 3.3V
22µF
1.5V at 5A
+
22µF
+
ADJ
R1
124Ω
R2
24.9Ω
VOUT = VREF(1+R2/R1) + IAdj • R2
FAN1585A-1.5
V
IN
V
OUT
V
IN
= 3.3V
1.5V at 5A
+
+
GND
22µF
22µF
REV. 1.1.5 11/7/03
FAN1585A
PRODUCT SPECIFICATION
Pin Assignments
FAN1585AT-1.5
FAN1585AT-1.8
FAN1585AT
FRONT VIEW
FRONT VIEW
FAN1585AM-1.5
FAN1585AM-1.8
FAN1585AMC-1.5
FAN1585AMC-1.8
FAN1585AM
FRONT VIEW
FAN1585AMC
FRONT VIEW
FRONT VIEW
FRONT VIEW
Tab is Out.
1
2
3
1
2
3
Tab is Out.
Tab is Out.
1
2
3
1
2
3
1
2
3
1
2
3
GND OUT IN
ADJ OUT IN
GND
IN
ADJ
IN
ADJ OUT IN
GND OUT IN
3-Lead Plastic TO-263
= 3°C/W*
3-Lead Plastic TO-263 Center Cut
= 3°C/W*
3-Lead Plastic TO-220
= 3°C/W
θ
θ
θ
JC
JC
JC
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, Θ can vary from
JA
30°C/W to more than 40°C/W. Other mounting techniques can provide a thermal resistance lower than 30°C/W.
Absolute Maximum Ratings
Parameter
Min.
Max.
18
Unit
V
V
IN
Operating Junction Temperature Range
Storage Temperature Range
0
125
150
300
°C
°C
°C
-65
Lead Temperature (Soldering, 10 sec.)
7
6
5
4
3
2
1
0
0
2
4
6
8
10
12
14
VIN–VOUT (V)
Absolute Maximum Safe Operating Area
2
REV. 1.1.5 11/7/03
PRODUCT SPECIFICATION
FAN1585A
Electrical Characteristics
Tj = 25°C unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.
Parameter
Conditions
Min.
Typ.
Max
Units
Reference Voltage3
1.5V ≤ (V – V
) ≤ 5.75V,
•
•
•
•
•
1.225
(-2%)
1.250
1.275
(+2%)
V
IN
OUT
10mA ≤ I
OUT
≤ 5A
Output Voltage4
3.0V ≤ V ≤ 8V
IN
1.47
1.5
1.8
1.53
1.836
0.2
V
V
10mA ≤ I
OUT
≤ 5A
Output Voltage5
3.3V ≤ V ≤ 8.3V
IN
1.764
10mA ≤ I
OUT
≤ 5A
Line Regulation1, 2
Load Regulation1, 2, 3
(V
OUT
+ 1.5V) ≤ V ≤ 12V,
IN
0.005
0.05
%
%
I
= 10mA
OUT
(V – V
10mA ≤ I
OUT
) = 3V,
≤ 5A
0.5
IN OUT
Dropout Voltage
Current Limit
Adjust Pin Current3
∆V
= 1%, I
= 5A
•
•
•
•
1.150
5.9
1.300
V
A
REF
OUT
(V – V
IN OUT
) = 2V
5.1
35
120
5
µA
µA
Adjust Pin Current Change3 1.5V ≤ (V – V
) ≤ 5.75V,
) ≤ 12V
0.2
IN
OUT
10mA ≤ I
OUT
≤ 5A
Minimum Load Current
Quiescent Current
Ripple Rejection
1.5V ≤ (V – V
IN
•
•
10
60
mA
mA
dB
OUT
V
IN
= 5V
4
13
f = 120Hz, C
(V – V
IN
= 22µF Tantalum,
) = 3V, I = 5A
72
OUT
OUT OUT
Thermal Regulation
Temperature Stability
Long-Term Stability
RMS Output Noise
T = 25°C, 30ms pulse
0.004
0.5
0.02
1.0
%/W
%
A
•
T = 125°C, 1000 hrs.
A
0.03
0.003
%
T = 25°C, 10Hz ≤ f ≤ 10kHz
A
%
(% of V
)
OUT
Thermal Resistance,
Junction to Case
TO-220
TO-263
3
3
°C/W
°C/W
°C
Thermal Shutdown
150
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. 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. FAN1585A only.
4. FAN1585A-1.5 only.
5. FAN1585A-1.8 only.
REV. 1.1.5 11/7/03
3
FAN1585A
PRODUCT SPECIFICATION
Typical Performance Characteristics
1.5
1.4
1.3
1.2
1.1
0.10
0.05
0
∆I = 5A
-0.05
-0.10
-0.15
-0.20
1.0
0.9
0.8
0.7
0.6
0.5
T=0°C
T=125°C
T=25°C
-75 -50 -25
0
25 50 75 100 125 150 175
0
1
2
3
4
5
6
JUNCTION TEMPERATURE (°C)
OUTPUT CURRENT (A)
Figure 1. Dropout Voltage vs. Output Current
Figure 2. Load Regulation vs. Temperature
1.275
1.270
1.265
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
3.70
V
set with 1% Resistors
OUT
V
= 3.6V1
3.65
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
OUT
V
0
= 3.3V1
OUT
Note:
1. FAN1585A Only
-75 -50 -25
0
25 50 75 100 125 150 175
-75 -50 -25
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Figure 3. Reference Voltage vs. Temperature
Figure 4. Output Voltage vs. Temperature
5
4
3
2
1
0
100
Note:
1. FAN1585A Only
90
80
70
60
50
40
30
20
10
0
-75 -50 -25
0
25 50 75 100 125 150 175
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Figure 5. Minimum Load Current vs. Temperature
Figure 6. Adjust Pin Current vs. Temperature
4
REV. 1.1.5 11/7/03
PRODUCT SPECIFICATION
FAN1585A
Typical Performance Characteristics (continued)
8.0
7.0
6.0
5.0
4.0
90
80
70
60
50
40
30
20
10
0
(V – V
IN
) ≤ 3V
OUT
0.5V ≤ V
≤ 2V
RIPPLE
= 5A
I
OUT
10
100
1K
FREQUENCY (Hz)
10K
100K
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 7. Short-Circuit Current vs. Temperature
Figure 8. Ripple Rejection vs. Frequency
2.5
2
20
15
10
5
1.5
1
Area of Instability
0.5
0
Stable Area
1000
0
50 60 70 80 90 100 110 120 130 140 150
0
2000
3000
4000
5000
CASE TEMPERATURE (°C)
LOAD CURRENT (mA)
Figure 9. Maximum Power Dissipation
Figure 10. Stability Region V /V = 5V/1.5V
IN OUT
REV. 1.1.5 11/7/03
5
FAN1585A
PRODUCT SPECIFICATION
Applications Information
break down and none of the protection circuitry is then func-
tional.
General
The FAN1585A and FAN1585A-1.5 are three-terminal regu-
lators optimized for GTL+ V termination and logic appli-
TT
cations. These devices are short-circuit protected and offer
thermal shutdown to turn off the regulator when the junction
temperature exceeds about 150°C. The FAN1585A 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 microprocessor buses
like GTL+.
D1
1N4002
(OPTIONAL)
FAN1585A
V
IN
V
OUT
IN
OUT
+
+
C1
22µF
C2
22µF
ADJ
+
R1
R2
Stability
C
ADJ
The FAN1585A series requires an output capacitor as a part
of the frequency compensation. It is recommended to use a
22µF solid tantalum or a 100 µF aluminum electrolytic on
the output to ensure stability. The frequency compensation of
these devices optimizes the frequency response with low
ESR capacitors. In general, it is suggested to use capacitors
with an ESR of <300mΩ. It is also recommended to use
bypass capacitors such as a 22µF tantalum or a 100µF alumi-
num on the adjust pin of the FAN1585A 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
Characteristics for graph of stability of output capacitance
ESR vs load current.
D1
1N4002
(OPTIONAL)
FAN1585A-1.5
V
IN
V
OUT
IN
OUT
+
+
C1
22µF
C2
22µF
GND
Figure 10. Optional Protection
Protection Diodes
Ripple Rejection
In normal operation, the FAN1585A series does not require
any protection diodes. For the FAN1585A, 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 condi-
tions.
In applications that require improved ripple rejection, a
bypass capacitor from the adjust pin of the FAN1585A to
ground reduces the output ripple by the ratio of V
/1.25V.
OUT
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 10. 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.
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 FAN1585A series can handle micro-
second 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. 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 10. Usually, normal power supply cycling
or system “hot plugging and unplugging” will not generate
current large enough to do any damage.
Output Voltage
The FAN1585A regulator develops a 1.25V reference volt-
age between the output pin and the adjust pin (see Figure
11). 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
6
REV. 1.1.5 11/7/03
PRODUCT SPECIFICATION
FAN1585A
R
P
FAN1585A
OUT
PARASITIC
LINE RESISTANCE
FAN1585A
OUT
V
IN
V
OUT
IN
+
+
V
IN
IN
C1
22µF
C2
22µF
V
REF
ADJ
R1
R2
ADJ
I
ADJ
35µA
R1*
R2*
R
L
V
OUT
= V
REF
(1 + R2/R1) + I
(R2)
ADJ
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
Figure 11. Basic Regulator Circuit
Load Regulation
It is not possible to provide true remote load sensing because
the FAN1585A series are three-terminal devices. Load regu-
lation is limited by the resistance of the wire connecting the
regulators to the load. Load regulation per the data sheet
specification is measured at the bottom of the package.
Figure 13. Connection for Best Load Regulation
Thermal Considerations
The FAN1585A series protect themselves under overload
conditions with internal power and thermal limiting circuitry.
However, for normal continuous load conditions, do not
exceed maximum junction temperature ratings. It is impor-
tant to consider all sources of thermal resistance from junc-
tion-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 tempera-
ture and ensure safe operating temperatures.
For fixed voltage devices, negative side sensing is a true
Kelvin connection with the ground pin of the device returned
to the negative side of the load. This is illustrated in Figure 12.
R
P
PARASITIC
LINE RESISTANCE
FAN1585A-1.5
IN OUT
V
IN
GND
For example, look at using an FAN1585AT to generate 5A
@ 1.5V ± 2% from a 3.3V source (3.2V to 3.6V).
R
L
Assumptions:
Figure 12. Connection for Best Load Regulation
• V = 3.6V worst case
IN
• V
• I
OUT
= 1.46V worst case
= 5A continuous
OUT
For adjustable voltage devices, negative side sensing is a true
Kelvin connection with the bottom of the output divider
returned to the negative side of the load. The best load regu-
lation is obtained when the top of the resistor divider R1 con-
nects directly to the regulator output and not to the load.
Figure 13 illustrates this point.
• T = 50°C
A
• θ
= 3°C/W (assuming both a heatsink and
Case-to-Ambient
a thermally conductive material)
The power dissipation in this application is:
If R1 connects to the load, then the effective resistance
between the regulator and the load would be:
P
D
= (V – V
) * (I ) = (3.6 – 1.46) * (5) = 10.7W
OUT
IN OUT
From the specification table:
R x (1 + R2/R1), R = Parasitic Line Resistance
P
P
T = T + (P ) * (θ
+ θ )
JC
J
A
D
Case-to-Ambient
The connection shown in Figure 13 does not multiply R by
the divider ratio. As an example, R is about four milliohms
P
P
= 50 + (10.7) * (3 + 3) = 115°C
per foot with 16-gauge wire. This translates to 4mV per foot
at 1A load current. At higher load currents, this drop repre-
sents a significant percentage of the overall regulation. It is
important to keep the positive lead between the regulator and
the load as short as possible and to use large wire or PC
board traces.
The junction temperature is below the maximum rating.
REV. 1.1.5 11/7/03
7
FAN1585A
PRODUCT SPECIFICATION
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 cases of the FAN1585A series are directly
connected to the output of the device.
U1
FAN1585A
V
3.3V
V
1.5V
IN
OUT
V
V
OUT
IN
R1
124Ω
+
+
ADJ
+
C1
22µF
C3
100µF
R2
24.9Ω
C2
100µF
Figure 14. Application Circuit (FAN1585A)
Table 1. Bill of Materials for Application Circuit for the FAN1585A
Item
C1
Quantity
Manufacturer
Xicon
Part Number
L10V22
Description
1
2
1
1
1
22µF, 10V Aluminum
100µF, 10V Aluminum
124Ω, 1%
C2, C3
R1
Xicon
L10V100
Generic
Generic
Fairchild
R2
24.9Ω, 1%
U1
FAN1585AT
5A Regulator
U1
FAN1585A-1.5
V
V
IN
OUT
1.5V
V
V
OUT
IN
3.3V
+
+
GND
C1
22µF
C3
100µF
Figure 15. Application Circuit (FAN1585A-1.5)
Table 2. Bill of Materials for Application Circuit for the FAN1585A-1.5
Item
C1
Quantity
Manufacturer
Xicon
Part Number
L10V22
Description
1
1
1
22µF, 10V Aluminum
100µF, 10V Aluminum
5A Regulator
C3
Xicon
L10V100
U1
Fairchild
FAN1585AT-1.5
8
REV. 1.1.5 11/7/03
PRODUCT SPECIFICATION
FAN1585A
Mechanical Dimensions
3-Lead TO-263 Package
Notes:
Inches
Millimeters
1. Dimensions are exclusive of mold flash and metal burrs.
Symbol
Notes
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. Dimensiuon exclusive of dambar protrusion or intrusion.
5. Formed leads to be planar with respect to one another at seating
place -C-.
Min.
Max.
Min.
Max.
A
.160
.020
.049
.045
.340
.380
.190
.036
.051
.055
.380
.405
4.06
0.51
1.25
1.14
8.64
9.65
4.83
0.91
1.30
1.40
9.65
10.29
b
b2
c2
D
E
e
.100 BSC
2.54 BSC
L
.575
.090
—
.017
0°
.625
14.61
2.29
—
0.43
0°
15.88
2.79
1.40
0.78
8°
L1
L2
R
.110
.055
.019
8°
α
E
@PKG/
@HEATSINK
L2
c2
D
E-PIN
L
R (2 PLCS)
b2
L1
b
e
-B- -A-
A
-C-
REV. 1.1.5 11/7/03
9
FAN1585A
PRODUCT SPECIFICATION
Mechanical Dimensions (continued)
3-Lead TO-263 Center Cut Package
Notes:
Inches
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. Dimensiuon exclusive of dambar protrusion or intrusion.
5. Formed leads to be planar with respect to one another at seating
place -C-.
Symbol
Notes
Min.
Max.
Min.
Max.
A
.160
.020
.049
.045
.340
.380
.190
.036
.051
.055
.380
.405
4.06
0.51
1.25
1.14
8.64
9.65
4.83
0.91
1.30
1.40
9.65
10.29
b
b2
c2
D
E
e
.100 BSC
2.54 BSC
L
.575
.625
.110
.055
14.61
15.88
L1
L2
.090
—
2.29
—
2.79
1.40
1.78
0.78
8°
L3
R
.050
.017
0°
1.27
0.43
0°
.070
.019
8°
α
E
@PKG/
@HEATSINK
L2
c2
D
E-PIN
L
R (2 PLCS)
b2
L1
L3
b
e
-B- -A-
A
-C-
10
REV. 1.1.5 11/7/03
PRODUCT SPECIFICATION
FAN1585A
Mechanical Dimensions (continued)
3-Lead TO-220 Package
Inches
Millimeters
Symbol
Notes
Min.
Max.
Min.
Max.
A
.140
.015
.045
.014
.139
.560
.380
.090
.190
.045
.190
.040
3.56
.38
4.83
1.02
b
b1
c1
øP
D
1.14
.36
.070
.022
.161
1.78
.56
3.53
14.22
9.65
2.29
4.83
1.14
4.09
.650
.420
.110
.210
—
16.51
10.67
2.79
5.33
—
E
e
e1
e3
F
.020
.230
.060
.055
.270
.115
.51
1.40
6.87
2.92
H1
J1
L
5.94
2.04
.500
.580
12.70
14.73
L1
Q
α
.250 BSC
6.35 BSC
.100
.135
2.54
3.43
Notes:
3°
7°
3°
7°
1. Dimension c1 apply for lead finish.
H1
Q
L
b1
e3
e
e1
E
b
L1
E-PIN
øP
α (5X)
c1
A
J1
F
D
REV. 1.1.5 11/7/03
11
FAN1585A
PRODUCT SPECIFICATION
Ordering Information
Product Number
FAN1585AMX
Package
TO-263 in Tape and Reel
TO-263 Center Cut in Tape and Reel
TO-220
FAN1585AMCX
FAN1585AT
FAN1585AM15X
FAN1585AMC15X
FAN1585AT15
FAN1585AM18X
FAN1585AMC18X
FAN1585AT18
TO-263 in Tape and Reel
TO-263 Center Cut in Tape and Reel
TO-220
TO-263 in Tape and Reel
TO-263 Center Cut in Tape and Reel
TO-220
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
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, or (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 significant injury to the user.
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.
www.fairchildsemi.com
11/7/03 0.0m 001
Stock#DS30001585
2002 Fairchild Semiconductor Corporation
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