Fairchild FAN1117A service manual
www.fairchildsemi.com
FAN1117A
1A 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-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
Typical Applications
Description
The F AN1117A and FAN1117A-1.8, -2.5, -2.85, -3.3 and -5
are low dropout three-terminal regulators with 1A output
current capability. These de vices ha v e been optimized for lo w
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.
V
= 12V V
V
IN
OUT
V
10µF22µF
= V
REF
= 12V V
IN
+
(1 + R2/R1) + I
10µF
FAN1117A
ADJ
GND
V
OUT
R1
124Ω
R2
768Ω
V
OUT
22µF
IN
• R2
ADJ
FAN1117A-5
++
IN
+
5V at 1A
9V at 1A
REV. 1.1.0 11/7/03
°
°
°
PRODUCT SPECIFICATION FAN1117A
Pin Assignments
Front View
Tab is V
OUT
Front View
Tab is V
OUT
Front View
3
IN
Tab is
V
OUT
4-Lead Plastic SOT-223
ΘJC = 15°C/W*
2
1
OUT
ADJ/GND
1
23
ADJ/
OUT IN
GND
3-Lead Plastic TO-252
ΘJC = 3°C/W*
*With package soldered to 0.5 square inch copper area ov er backside ground plane or internal power plane, Θ
123
ADJ/
OUT IN
GND
3-Lead Plastic TO-220
ΘJC = 3°C/W*
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
(V
IN
– V
OUT
) * I
OUT
Operating Junction Temperature Range 0 125
Storage Temperature Range -65 150
Lead Temperature (Soldering, 10 sec.) 300
18 V
See Figure 1
C
C
C
1.2
1.0
0.8
(A)
0.6
OUT
I
0.4
0.2
0
068
VIN – V
10 12 14 16 18 2042
OUT
(V)
Figure 1. Absolute Maximum Safe Operating Area
2
REV. 1.1.0 11/7/03
≤
) ≤
≤ 1A •
≤
≤
≤
≤
≤
≤
≤
≤ 1A •
∆
•
•
•
µ
) ≤
≤ 1A •
µ
) ≤
•
•
FAN1117A 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
Output Voltage
Line Regulation
Load Regulation
3
4
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, Junction
to Case
Thermal Shutdown Junction Temperature 155 °C
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 (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.
IN
7V, T
= 25°C unless otherwise specified.
J
1.5V ≤ (V
10mA ≤ I
10mA ≤ I
FAN1117A-1.8, 3.3V ≤ V
FAN1117A-2.5, 4V ≤ V
FAN1117A-2.85, 4.35V ≤ V
FAN1117A-3.3, 4.8V ≤ V
FAN1117A-5, 6.5V ≤ V
(V
OUT
(V
– V
IN
V
REF
– V
IN
3,4
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
7V,
8.8V
IN
9.5V
IN
IN
IN
12V, I
IN
IN
10.3V
12V
OUT
OUT
9.85V
= 10mA •
= 1A
7V,
15V
= 22 µ F Tantalum,
= 1A
OUT
1.225
(-2%)
•
1.764
•
2.450
•
2.793
•
3.234
•
4.900
SOT-223 15
TO-252, TO-220 3
1.250 1.275
(+2%)
1.8
2.5
2.85
3.3
5.0
1.836
2.550
2.907
3.366
5.100
0.005 0.2 %
0.05 0.5 %
1.100 1.200 V
1.1 1.5 A
35 120
0.2 5
10 mA
413mA
60 72 dB
0.5 %
C/W
°C/W
10 °C
V
V
V
V
V
V
A
A
•
°
REV. 1.1.0 11/7/03
3
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