Fairchild Semiconductor FAN1086 Datasheet
www.fairchildsemi.com
FAN1086
1.5A Adjustable/Fixed Low Dropout Linear Regulator
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
Typical Applications
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 industrystandard SOT-223, TO-263, and TO-252 power packages.
V
= 3.3V
IN
V
10µF22µF
V
= V
OUT
= 5V V
IN
(1 + R2/R1) + I
REF
10µF
FAN1086
V
+
++
IN
• R2
Adj
FAN1086-2.85
IN
ADJ
GND
V
OUT
R1
124Ω
R2
24.9Ω
V
OUT
22µF
1.5V at 1.5A
+
2.85V at 1.5A
REV. 1.0.5 2/11/02
°
°
°
PRODUCT SPECIFICATION FAN1086
Pin Assignments
Front View
3
IN
Tab is
V
OUT
4-Lead Plastic SOT-223
Θ
= 15°C/W*
JC
2
1
OUT
ADJ/GND
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, Θ
Tab is
V
OUT
1
23
ADJ/
GND
3-Lead Plastic TO-263
OUT IN
ΘJC = 3°C/W*
Tab is
V
OUT
1
23
ADJ/
GND
3-Lead Plastic TO-252
ΘJC = 3°C/W*
IN
can vary from
JA
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
Operating Junction Temperature Range 0 125
Storage Temperature Range -65 150
Lead Temperature (Soldering, 10 sec.) 300
7.5 V
C
C
C
2
REV. 1.0.5 2/11/02
≤
) ≤
≤ 1A •
≤
≤
≤
≤
≤
≤
≤ 1A •
∆
•
•
•
µ
) ≤
≤ 1A •
µ
) ≤
•
•
•
FAN1086 PRODUCT SPECIFICATION
Electrical Characteristics
Operating Conditions: V
The • denotes specifications which apply over the specified operating temperature range.
Parameter Conditions Min. Typ. Max. Units
Reference Voltage
3
Output Voltage 10mA ≤ I
Line Regulation
Load Regulation
1,2
1,2
Dropout Voltage
Current Limit (V
Adjust Pin Current
3
Adjust Pin Current Change
Minimum Load Current 1.5V ≤ (V
Quiescent Current V
Ripple Rejection f = 120Hz, C
Thermal Regulation T
Temperature Stability
Long-Term Stability T
RMS Output Noise
(% of V
OUT
)
Thermal Resistance,
Juncation to Case
Thermal Shutdown Junction Temperature 155
Thermal Shutdown
Hysteresis
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.
, I
, V
Adj
IN
REF
7V, T
= 25°C unless otherwise specified.
J
1.5V ≤ (V
10mA ≤ I
FAN1086-2.5, 4V ≤ V
FAN1086-2.85, 4.35V ≤ V
FAN1086-3.3, 4.8V ≤ V
FAN1086-5, 6.5V ≤ V
(V
OUT
(V
– V
IN
V
REF
– V
IN
3
1.5V ≤ (V
10mA ≤ I
= V
IN
(V
– V
IN
= 25 ° C, 30ms pulse 0.004 0.02 %/W
A
= 125 ° C, 1000hrs. 0.03 1.0 %
A
T
= 25 ° C, 10Hz ≤ f ≤ 10kHz 0.003 %
A
- V
IN
OUT
OUT
1A
OUT
+ 1.5V) ≤ V
) = 2V, 10mA ≤ I
OUT
= 1%, I
OUT
IN
OUT
IN
OUT
OUT
OUT
) = 2V
– V
OUT
– V
OUT
+ 1.25V
OUT
) = 3V, I
5.75V,
7V
IN
IN
7V, I
IN
7V
IN
7V
IN
7V
= 10mA •
OUT
OUT
= 1.5A
5.75,
5.75
= 22 µ F Tantalum,
= 1.5A
OUT
1.225
(-2%)
•
2.450
•
2.793
•
3.234
•
4.900
SOT-223 15
TO-263, TO-252 3
1.250 1.275
(+2%)
2.5
2.85
3.3
5.0
2.550
2.907
3.366
5.100
0.005 0.2 %
0.05 0.5 %
1.300 1.500 V
1.6 2.0 A
35 120
0.2 5
10 mA
413mA
60 72 dB
0.5 %
C/W
C/W
10
V
V
V
V
V
A
A
C
C
°
°
°
°
REV. 1.0.5 2/11/02
3
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