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FAN1117AT

P1-P3P4-P6P7-P9
www.fairchildsemi.com
REV. 1.1.0 11/7/03
Features
• Low dropout voltage
• Load regulation: 0.05% typical
• Trimmed current limit
• On-chip thermal limiting
• Standard SOT-223, TO-220, and TO-252 packages
• Three-terminal adjustable or fixed 1.8V, 2.5V, 2.85V,
3.3V, 5V
Applications
• Active SCSI terminators
• High efficiency linear regulators
• Post regulators for switching supplies
• Battery chargers
• 12V to 5V linear regulators
• Motherboard clock supplies
Description
The FAN1117A and FAN1117A-1.8, -2.5, -2.85, -3.3 and -5
are low dropout three-terminal regulators with 1A 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 FAN1117A flows into the load, increasing efficiency.
The FAN1117A series regulators are available in the
industry-standard SOT-223, TO-220, and TO-252 (DPAK)
power packages.
Typical Applications
V
IN
= 12V V
IN
V
OUT
ADJ
9V at 1A
FAN1117A
10µF22µF
R1
124Ω
R2
768Ω
V
IN
= 12V V
IN
V
OUT
GND
5V at 1A
FAN1117A-5
10µF
++
+
+
22µF
V
OUT
= V
REF
(1 + R2/R1) + I
ADJ
• R2
FAN1117A
1A Adjustable/Fixed Low Dropout Linear Regulator
PRODUCT SPECIFICATION FAN1117A
2
REV. 1.1.0 11/7/03
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
Figure 1. Absolute Maximum Safe Operating Area
Parameter Min. Max. Unit
V
IN
18 V
(V
IN
– V
OUT
) * I
OUT
See Figure 1
Operating Junction Temperature Range 0 125
°
C
Storage Temperature Range -65 150
°
C
Lead Temperature (Soldering, 10 sec.) 300
°
C
Front View
Front View
4-Lead Plastic SOT-223
Θ
JC
= 15°C/W*
3-Lead Plastic TO-252
Θ
JC
= 3°C/W*
3-Lead Plastic TO-220
Θ
JC
= 3°C/W*
Tab is
V
OUT
Tab is V
OUT
Front View
Tab is V
OUT
1
ADJ/
GND
OUT IN
23
3
2
1
IN
OUT
ADJ/GND
ADJ/
GND
OUT IN
123
1.2
1.0
0.8
0.6
0.4
0.2
0
068
10 12 14 16 18 2042
V
IN
– V
OUT
(V)
I
OUT
(A)
FAN1117A PRODUCT SPECIFICATION
REV. 1.1.0 11/7/03
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 (18W). 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. FAN1117A only.
4. Output current must be limited to meet the absolute maximum ratings of the part.
Parameter Conditions Min. Typ. Max. Units
Reference Voltage
3
1.5V
≤
(V
IN
– V
OUT
)
≤
7V,
10mA
≤
I
OUT
≤
1A
•
1.225
(-2%)
1.250 1.275
(+2%)
V
Output Voltage
4
10mA
≤
I
OUT
≤
1A
FAN1117A-1.8, 3.3V
≤
V
IN
≤
8.8V
FAN1117A-2.5, 4V
≤
V
IN
≤
9.5V
FAN1117A-2.85, 4.35V
≤
V
IN
≤
9.85V
FAN1117A-3.3, 4.8V
≤
V
IN
≤
10.3V
FAN1117A-5, 6.5V
≤
V
IN
≤
12V
•
•
•
•
•
1.764
2.450
2.793
3.234
4.900
1.8
2.5
2.85
3.3
5.0
1.836
2.550
2.907
3.366
5.100
V
V
V
V
V
Line Regulation
1,2
(V
OUT
+ 1.5V)
≤
V
IN
≤
12V, 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
= 1A
•
1.100 1.200 V
Current Limit (V
IN
– V
OUT
) = 2V
•
1.1 1.5 A
Adjust Pin Current
3
•
35 120
µ
A
Adjust Pin Current Change
3,4
1.5V
≤
(V
IN
– V
OUT
)
≤
7V,
10mA
≤
I
OUT
≤
1A
•
0.2 5
µ
A
Minimum Load Current 1.5V
≤
(V
IN
– V
OUT
)
≤
15V
•
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
= 1A
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, Junction
to Case
SOT-223 15
°
C/W
TO-252, TO-220 3
°C/W
Thermal Shutdown Junction Temperature 155 °C
Thermal Shutdown
Hysteresis
10 °C
P1-P3P4-P6P7-P9

FAN1117AT

Mfr. #:
Buy FAN1117AT
Manufacturer:
ON Semiconductor / Fairchild
Description:
LDO Voltage Regulators 1A Adjustable LDO
Lifecycle:
New from this manufacturer.
Delivery:
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