www.fairchildsemi.com
FAN1616A
0.5A Adjustable/Fixed Low Dropout Linear Regulator
Features
•
•
•
•
•
•
•
Low dropout voltage
Load regulation: 0.05% typical
Current limit
On-chip thermal limiting
Standard SOT-223 and TO-252 packages
Three-terminal adjustable or fixed 1.8V, 2.5V, 3.3V or 5V
Specified from -40°C to +125°C
Description
The FAN1616A, FAN1616A-1.8, -2.5, -3.3 and -5 are low
dropout three-terminal regulators with 0.5A output current
capability. These devices have been optimized for applica-
tions where transient response and minimum dropout voltage
are critical. The 5V version is designed also to be used in
USB Hub and Motherboard applications.
On-chip thermal limiting provides protection against any
combination of overload and ambient temperature that
would create excessive junction temperatures.
Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the bias current of the
FAN1616A flows into the load, increasing efficiency.
The FAN1616A series regulators are available in the
industry-standard SOT-223 and TO-252 power packages.
Applications
• USB Controlled Power Supply
• High efficiency linear regulators for Mixed Voltage
Logic, ASIC, FPGA based systems
• Post regulators for switching supplies
• Battery chargers
• 12V to 5V, 3.3V, 2.5V, 1.8V, or adj linear regulators
• Motherboard clock supplies
• SDRAM Module supplies
Typical Applications
FAN1616A
V
IN
= 12V
10µF
ADJ
+
V
IN
V
OUT
R1
124Ω
+
22µF
9V at 0.5A
V
OUT
= V
REF
(1 + R2/R1) + I
Adj
• R2
R2
768Ω
FAN1616A-3.3
V
IN
= 9V
10µF
GND
+
V
IN
V
OUT
+
22µF
3.3V at 0.5A
REV. 1.0.5 3/1/02
PRODUCT SPECIFICATION
FAN1616A
Pin Assignments
FAN1616AS (Variable)
FAN1616AS-X (Fixed)
Front View
3
Tab is
OUT
2
1
IN
OUT
Tab is OUT
ADJ/GND
1
4-Lead Plastic SOT-223
Θ
JC
= 15°C/W*
2
3
FAN1616AD (Variable)
FAN1616AD-X (Fixed)
Front View
ADJ/
GND
IN
3-Lead Plastic TO-252
Θ
JC
= 3°C/W*
*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 >50°C/W. Other mounting techniques may provide better power dissipation than 30°C/W.
Absolute Maximum Ratings
Parameter
V
IN
(V
IN
–V
OUT
) * I
OUT
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
-40
-65
Min.
Max.
18
See Figure 1
125
150
300
°C
°C
°C
Unit
V
0.6
0.5
I
OUT
(A)
0.4
0.3
0.2
0.1
0
0
2
4
6
V
IN
– V
OUT
(V)
8
10
12
Figure 1. Absolute Maximum Safe Operating Area
2
REV. 1.0.5 3/1/02
FAN1616A
PRODUCT SPECIFICATION
Electrical Characteristics
Operating Conditions: V
IN
≤
12V, T
J
= 25°C unless otherwise specified.
The
•
denotes specifications which apply over the specified operating temperature range.
Parameter
Reference
Voltage
3
Conditions
1.5V
≤
(V
IN
- V
OUT
)
≤
5.75V,
10mA
≤
I
OUT
≤
0.5A
10mA
≤
I
OUT
≤
0.5A
FAN1616A-1.8, 3.3V
≤
V
IN
≤
12V
FAN1616A-2.5, 4.0V
≤
V
IN
≤
12V
FAN1616A-3.3, 4.5V
≤
V
IN
≤
12V
FAN1616A-5, 6.2V
≤
V
IN
≤
12V
(V
OUT
+ 1.5V)
≤
V
IN
≤
12V, I
OUT
= 10mA
(V
IN
– V
OUT
) = 2V, 10mA
≤
I
OUT
≤
0.5A
∆
V
REF
= 1%, I
OUT
= 0.5A
•
Min.
1.225
(-2%)
1.764
2.450
3.234
4.900
Typ.
1.250
Max.
1.275
(+2%)
1.836
2.550
3.366
5.100
0.2
0.5
1.200
120
5
Units
V
Output Voltage
4
•
•
•
•
•
•
•
•
•
•
•
1.800
2.500
3.300
5.000
0.005
0.05
1.000
35
0.2
V
V
V
V
%
%
V
µ
A
µ
A
mA
Line Regulation
1,2
Load Regulation
1,2,3
Dropout Voltage
Adjust Pin Current
3
Adjust Pin Current Change
3, 4
1.5V
≤
(V
IN
– V
OUT
)
≤
12V,
10mA
≤
I
OUT
≤
0.5A
Minimum Load Current
Quiescent Current
Ripple Rejection
Thermal Regulation
Temperature Stability
Long-Term Stability
RMS Output Noise
(% of V
OUT
)
Thermal Resistance,
Juncation to Case
Thermal Shutdown
T
A
= 125
°
C, 1000hrs.
T
A
= 25
°
C, 10Hz
≤
f
≤
10kHz
SOT-223
TO-252
1.5V
≤
(V
IN
– V
OUT
)
≤
12V
V
IN
= V
OUT
+ 1.25V
f = 120Hz, C
OUT
= 22
µ
F Tantalum,
(V
IN
– V
OUT
) = 3V, I
OUT
= 0.5A
T
A
= 25
°
C, 30ms pulse
10
4
60
72
0.004
0.02
1.0
13
mA
dB
%/W
%
%
%
°
C/W
°
C/W
°
C
•
0.5
0.03
0.003
15
3
150
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. FAN1616A only.
4. Output current must be limited to meet the absolute maximum ratings of the part.
REV. 1.0.5 3/1/02
3
PRODUCT SPECIFICATION
FAN1616A
Typical Performance Characteristics
1.5
1.4
DROPOUT VOLTAGE (V)
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0
0
0.2
0.4
0.6
0.8
1.0
T
J
= 0°C
T
J
= 25°C
T
J
= 125°C
0.10
OUTPUT VOLTAGE DEVIATION (%)
0.05
0
-0.05
-0.10
-0.15
-0.20
-75 -50 -25 0
∆I
= 0.5A
25 50 75 100 125 150 175
OUTPUT CURRENT (A)
JUNCTION TEMPERATURE (°C)
Figure 2. Dropout Voltage vs. Output Current
1.260
1.255
REFERENCE VOLTAGE (V)
OUTPUT VOLTAGE (V)
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
-75 -50 -25 0
25 50 75 100 125 150 175
Note:
1. FAN1616A Only
Figure 3. Load Regulation vs. Temperature
3.70
3.65
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
Note:
1. FAN1616A Only
3.20
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
V
OUT
= 3.3V
V
OUT
SET WITH 1% RESISTORS
V
OUT
= 3.6V
1
JUNCTION TEMPERATURE (°C)
Figure 4. Reference Voltage vs. Temperature
Figure 5. Output Voltage vs. Temperature
5
MINIMUM LOAD CURRENT (mA)
ADJUST PIN CURRENT (µA)
100
90
Note:
1. FAN1616A Only
4
80
70
60
50
40
30
20
10
3
2
1
0
-75 -50 -25 0
25 50 75 100 125 150 175
0
-75 -50 -25 0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Figure 6. Minimum Load Current vs. Temperature
Figure 7. Adjust Pin Current vs. Temperature
4
REV. 1.0.5 3/1/02
FAN1616A
PRODUCT SPECIFICATION
Typical Performance Characteristics
(continued)
90
80
RIPPLE REJECTION (dB)
70
POWER (W)
60
50
40
30
20
10
0
10
(V
IN
- V
OUT
)
≤
3V
0.5
≤
V
RIPPLE
≤
2V
I
OUT
= 0.5A
100
1K
10K
100K
1
3
4
TO-252
2
SOT-223
0
50
60 70 80 90 100 110 120 130 140 150
CASE TEMPERATURE (°C)
FREQUENCY (Hz)
Figure 8. Ripple Rejection vs. Frequency
Figure 9. Maximum Power Dissipation
REV. 1.0.5 3/1/02
5
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