www.fairchildsemi.com
REV. 1.0.7 11/10/03
Features
• Low dropout voltage
• Load regulation: 0.05% typical
• Trimmed current limit
• On-chip thermal limiting
• Standard SOT-223, TO-263, and TO-252 packages
• Three-terminal adjustable or fixed 2.5V, 2.85V, 3.3V, 5V
Applications
• Active SCSI terminators
• High efficiency linear regulators
• Post regulators for switching supplies
• Battery chargers
• 5V to 3.3V linear regulators
• Motherboard clock supplies
Description
The FAN1086 and FAN1086-2.5, -2.85, -3.3 and -5 are low
dropout three-terminal regulators with 1.5A output current
capability. These devices ha v e been optimized for lo w v oltage
where transient response and minimum input voltage are
critical. The 2.85V version is designed specifically to be
used in Active Terminators for SCSI bus.
Current limit is trimmed to ensure specified output current
and controlled short-circuit current. On-chip thermal limiting
provides protection against an y combination of o verload and
ambient temperatures that would create excessive junction
temperatures.
Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the quiescent current
of the FAN1086 flows into the load, increasing efficiency.
The FAN1086 series regulators are available in the industry-
standard SOT-223, TO-263, and TO-252 power packages.
Typical Applications
VIN = 3.3V
VOUT = VREF(1 + R2/R1) + IAdj • R2
VIN VOUT
ADJ
1.5V at 1.5A
FAN1086
10µF22µF
R1
124Ω
R2
24.9Ω
VIN = 5V VIN VOUT
GND
2.85V at 1.5A
FAN1086-2.85
10µF++
++
22µF
FAN1086
1.5A Adjustable/Fixed Low Dropout Linear Regulator
PRODUCT SPECIFICATION FAN1086
2
REV. 1.0.7 11/10/03
Pin Assignments
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane,
Θ
JA
can vary from
30°C/W to more than 50°C/W. Other mounting techniques may provide better thermal resistance than 30°C/W.
Absolute Maximum Ratings
Parameter Min. Max. Unit
V
IN
7.5 V
Operating Junction Temperature Range 0 125
°
C
Storage Temperature Range -65 150
°
C
Lead Temperature (Soldering, 10 sec.) 300
°
C
F ront View
4-Lead Plastic SOT-223
ΘJC = 15°C/W*
3-Lead Plastic TO-263
ΘJC = 3°C/W*
3-Lead Plastic TO-252
ΘJC = 3°C/W*
Tab is
VOUT
Tab is
VOUT
1
ADJ/
GND OUT IN
23
Tab is
VOUT
1
ADJ/
GND IN
23
3
2
1
IN
OUT
ADJ/GND
FAN1086 PRODUCT SPECIFICATION
REV. 1.0.7 11/10/03
3
Electrical Characteristics
Operating Conditions: V
IN
≤
7V, T
J
= 25°C unless otherwise specified.
The
•
denotes specifications which apply over the specified operating temperature range.
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 current. Guaranteed maximum output power will not be available over the full input/output
voltage range.
3. FAN1086 only.
Parameter Conditions Min. Typ. Max. Units
Reference Voltage
3
, V
REF
1.5V
≤
(V
IN
- V
OUT
)
≤
5.75V,
10mA
≤
I
OUT
≤
1A
•
1.225
(-2%) 1.250 1.275
(+2%) V
Output Voltage 10mA
≤
I
OUT
≤
1A
FAN1086-2.5, 4V
≤
V
IN
≤
7V
FAN1086-2.85, 4.35V
≤
V
IN
≤
7V
FAN1086-3.3, 4.8V
≤
V
IN
≤
7V
FAN1086-5, 6.5V
≤
V
IN
≤
7V
•
•
•
•
2.450
2.793
3.234
4.900
2.5
2.85
3.3
5.0
2.550
2.907
3.366
5.100
V
V
V
V
Line Regulation
1,2
(V
OUT
+ 1.5V)
≤
V
IN
≤
7V, I
OUT
= 10mA
•
0.005 0.2 %
Load Regulation
1,2
(V
IN
– V
OUT
) = 2V, 10mA
≤
I
OUT
≤
1A
•
0.05 0.5 %
Dropout Voltage
∆
V
REF
= 1%, I
OUT
= 1.5A
•
1.300 1.500 V
Current Limit (V
IN
– V
OUT
) = 2V
•
1.6 2.0 A
Adjust Pin Current
3
, I
Adj
•
35 120
µ
A
Adjust Pin Current Change
3
1.5V
≤
(V
IN
– V
OUT
)
≤
5.75,
10mA
≤
I
OUT
≤
1A
•
0.2 5
µ
A
Minimum Load Current 1.5V
≤
(V
IN
– V
OUT
)
≤
5.75
•
10 mA
Quiescent Current V
IN
= V
OUT
+ 1.25V
•
413mA
Ripple Rejection f = 120Hz, C
OUT
= 22
µ
F Tantalum,
(V
IN
– V
OUT
) = 3V, I
OUT
= 1.5A 60 72 dB
Thermal Regulation T
A
= 25
°
C, 30ms pulse 0.004 0.02 %/W
Temperature Stability
•
0.5 %
Long-Term Stability T
A
= 125
°
C, 1000hrs. 0.03 1.0 %
RMS Output Noise
(% of V
OUT
)T
A
= 25
°
C, 10Hz
≤
f
≤
10kHz 0.003 %
Thermal Resistance,
Juncation to Case SOT-223 15
°
C/W
TO-263, TO-252 3
°
C/W
Thermal Shutdown Junction Temperature 155
°
C
Thermal Shutdown
Hysteresis 10
°
C
PRODUCT SPECIFICATION FAN1086
4
REV. 1.0.7 11/10/03
Typical Performance Characteristics
1.5 0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
00 0.9 1.20.60.3
OUTPUT CURRENT (A) JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C)
DROPOUT V OLTA GE (V)
REFERENCE V OLTAGE (V)
3.70
3.65
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
REFERENCE V OLTAGE (V)
100
90
80
70
60
50
40
30
20
10
0
ADJUST PIN CURRENT (µA)
5
4
3
2
1
0
MINIMUM LOAD CURRENT (mA)
DROPOUT VOLTAGE DEVIATION (%)
1.5 -75 -50 -25 0 25 50 75 100 125150 175
-75 -50 -25 0 25 50 75 100 125150 175 -75 -50 -25 0 25 50 75 100 125150 175
JUNCTION TEMPERATURE (°C)
-75 -50 -25 0 25 50 75 100 125150 175
JUNCTION TEMPERATURE (°C)
-75 -50 -25 0 25 50 75 100 125150 175
∆I = 1A
VOUT = 3.6V1
VOUT SET WITH 1% RESISTORS
VOUT = 3.3V
Note:
1. FAN1086 Only
Note:
1. FAN1086 Only
Figure 1. Dropout Voltage vs. Output Current Figure 2. Load Regulation vs. Temperature
Figure 3. Reference Voltage vs. Temperature Figure 4. Output Voltage vs. Temperature
Figure 5. Minimum Load Current vs. Temperature Figure 6. Adjust Pin Current vs. Temperature
FAN1086 PRODUCT SPECIFICATION
REV. 1.0.7 11/10/03
5
Typical Performance Characteristics
(continued)
2.0
1.75
1.5
1.25
1.0
SHORT-CIRCUIT CURRENT (A)
JUNCTION TEMPERATURE (°C)
-75 -50 -25 0 25 50 75 100 125150 175
10
7.5
5
2.5
0
POWER (W)
CASE TEMPERATURE (°C)
25 45 65 85 105 125
TO-263
SOT-223
90
80
70
60
50
40
30
20
10
0
RIPPLE REJECTION (dB)
FREQUENCY (Hz)
10 100 1K 10K 100K
(VIN - VOUT) = 3V
0.5 < VRIPPLE < 2V
IOUT = 1A
5000
4000
3000
1000
0
OUTPUT CAP'S ESR (mΩ)
VOUT (V)
012345678910
2000
VIN = 5V
10ma < IOUT < IMAX
Instability
Region
Region of Stability
(SOA)
Figure 7. Short-Circuit Current vs. Temperature Figure 8. Ripple Rejection vs. Frequency
Figure 9. Maximum Power Dissipation Figure 11. Stability Region (SOA) vs. ESR of the C
OUT
PRODUCT SPECIFICATION FAN1086
6REV. 1.0.7 11/10/03
Mechanical Dimensions
3-Lead TO-263 Package
A .160 .190 4.06 4.83
Symbol Inches
Min. Max. Min. Max.
Millimeters Notes
b .020 .036 0.51 0.91
b2 .049 .051 1.25 1.30
c2 .045 .055 1.14 1.40
D.340 .380 8.64 9.65
.380 .405 9.65 10.29
.100 BSC
E
e
L .575 .625 14.61 15.88
.090 .110 2.29 2.79
α
L1
L2 —.055 —1.40
.017 .019 0.43 0.78
R0°8°0°8°
Notes:
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-.
2.54 BSC
E
@PKG/
@HEATSINK
D
L2
A-C-
L
c2
L1
R (2 PLCS)
-A--B-
E-PIN
b2
b
e
FAN1086 PRODUCT SPECIFICATION
REV. 1.0.7 11/10/03 7
Mechanical Dimensions
4-Lead SOT-223 Package
A—.071
Symbol Inches
Min. Max. Min. Max.
Millimeters Notes
A1 —.181
.033
B .025
c—.090
E .130 .148
e
H .264 .287
.115 .124
.033 .041
—10°
F
F
I
J
D .248 .264
—1.80
—4.80
.840
.640
—2.29
3.30 3.71
6.71 7.29
.012 —.310 —
2.95 3.15
.840 1.04
—10°
10°16°
K10°16°
.0008 .0040
L.0203 .1018
10°16°
M10°16°
.010 .014
N.250 .360
6.30 6.71
A
D
e
E
c
H
A1
BI
J
K
LMN
PRODUCT SPECIFICATION FAN1086
8REV. 1.0.7 11/10/03
Mechanical Dimensions
3-Lead TO-252 Package
A .086 .094 2.19 2.39
Symbol Inches
Min. Max. Min. Max.
Millimeters Notes
b .025 .035 0.64 0.89
.045 1.14
b2 .030 0.76
.215 5.46 4
3
4
b3 .205 5.21
c2 .018 .023 0.46 0.58
c .018 .024 0.46 0.61
D .210 .245 5.33 6.22 1
1
E .250 .265 6.35 6.73
.090 BSC 2.29 BSC
.055 .070 1.40 1.78
e
L.370 .410 9.40 10.41
H
L1 .108 REF 2.74 REF
.035 .080 0.89 2.03
.025 .040 0.64 1.02
L3
L4
E
b3
@PKG/
@HEATSINK
D
L1
L3
L4
A-C-
H
c2
L
α = 0°–10°
-A--B-
E-PIN
b2
bc
e
Notes:
1.
2.
3.
4.
5.
6.
Dimensions are exclusive of mold flash and metal burrs.
Stand off-height is measured from lead tip with ref. to Datum -B-.
Foot length is measured with ref. to Datum -A- with lead surface.
Thermal pad contour optional within dimensions b3 and L3
Formed leads to be planar with respect to one another at seating
plane -C-.
Dimensions and tolerances per ASME Y14.5M-1994.
PRODUCT SPECIFICATION FAN1086
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
11/10/03 0.0m 004
Stock#DS30001117
2001 Fairchild Semiconductor Corporation
Ordering Information
Product Number Package
FAN1086DX TO-252
FAN1086MX TO-263
FAN1086SX SOT-223
FAN1086D25X TO-252
FAN1086M25X TO-263
FAN1086S25X SOT-223
FAN1086D285X TO-252
FAN1086M285X TO-263
FAN1086S285X SOT-223
FAN1086D33X TO-252
FAN1086M33X TO-263
FAN1086S33X SOT-223
FAN1086D5X TO-252
FAN1086M5X TO-263
FAN1086S5X SOT-223
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.
