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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 have been optimized for low voltage
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 any combination of overload 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
V
IN
= 3.3V
V
OUT
= V
REF
(1
+
R2/R1) + I
Adj
R2
V
IN
V
OUT
ADJ
1.5V at 1.5A
FAN1086
10
F
22
F
R1
124
R2
24.9
V
IN
= 5V
V
IN
V
OUT
GND
2.85V at 1.5A
FAN1086-2.85
10
F
+
+
+
+
22
F
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,
JA
can vary from
30C/W to more than 50C/W. Other mounting techniques may provide better thermal resistance than 30C/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
Front View
4-Lead Plastic SOT-223
JC
= 15
C/W*
3-Lead Plastic TO-263
JC
= 3
C/W*
3-Lead Plastic TO-252
JC
= 3
C/W*
Tab is
V
OUT
Tab is
V
OUT
1
ADJ/
GND
OUT
IN
2
3
Tab is
V
OUT
1
ADJ/
GND
IN
2
3
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
= 25C 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
A
Adjust Pin Current Change
3
1.5V
(V
IN
V
OUT
)
5.75,
10mA
I
OUT
1A
0.2
5
A
Minimum Load Current
1.5V
(V
IN
V
OUT
)
5.75
10
mA
Quiescent Current
V
IN
= V
OUT
+ 1.25V
4
13
mA
Ripple Rejection
f = 120Hz, C
OUT
= 22
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
0
0
0.9
1.2
0.6
0.3
OUTPUT CURRENT (A)
JUNCTION TEMPERATURE (
C)
JUNCTION TEMPERATURE (
C)
JUNCTION TEMPERATURE (
C)
DR
OPOUT V
O
L
T
A
GE
(V)
REFERENCE V
O
L
T
A
GE
(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
O
L
T
A
GE
(V)
100
90
80
70
60
50
40
30
20
10
0
ADJUST PIN CURRENT (
A)
5
4
3
2
1
0
MINIMUM LO
AD CURRENT (mA)
DR
OPOUT
V
O
L
T
A
GE DEVIA
TION (%)
1.5
-75 -50 -25 0
25 50 75 100 125 150 175
-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)
-75 -50 -25 0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (
C)
-75 -50 -25 0
25 50 75 100 125 150 175
I = 1A
V
OUT
= 3.6V
1
V
OUT
SET WITH 1% RESISTORS
V
OUT
= 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
SHOR
T
-CIRCUIT CURRENT (A)
JUNCTION TEMPERATURE (
C)
-75 -50 -25 0
25 50 75 100 125 150 175
10
7.5
5
2.5
0
PO
WER (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
(V
IN
- V
OUT
) = 3V
0.5 < V
RIPPLE
< 2V
I
OUT
= 1A
5000
4000
3000
1000
0
OUTPUT CAP'S ESR (m
)
V
OUT
(V)
0
1
2
3
4
5
6
7
8
9
10
2000
V
IN
= 5V
10ma < I
OUT
< I
MAX
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