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www.fairchildsemi.com
REV. 1.0.4 8/9/01
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 -40C to +125C
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
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 indus-
try-standard SOT-223 and TO-252 power packages.
Typical Applications
V
IN
= 12V
V
IN
V
OUT
ADJ
9V at 0.5A
FAN1616A
10
F
22
F
124
768
V
IN
= 9V
V
IN
V
OUT
GND
3.3V at 0.5A
FAN1616A-3.3
10
F
+
+
+
+
22
F
FAN1616A
0.5A Adjustable/Fixed Low Dropout Linear Regulator
PRODUCT SPECIFICATION
FAN1616A
2
REV. 1.0.4 8/9/01
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 >50C/W. Other mounting techniques may provide better power dissipation than 30C/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
-40
125
C
Storage Temperature Range
-65
150
C
Lead Temperature (Soldering, 10 sec.)
300
C
Front View
Front View
FAN1616AS (Variable)
FAN1616AS-X (Fixed)
FAN1616AD (Variable)
FAN1616AD-X (Fixed)
4-Lead Plastic SOT-223
JC
= 15
C/W*
3-Lead Plastic TO-252
JC
= 3
C/W*
Tab is
V
OUT
1
ADJ/
GND
OUT
IN
2
3
3
2
1
IN
OUT
ADJ/GND
0.6
0.5
0.4
0.3
0.2
0.1
0
0
6
8
10
12
4
2
V
IN
V
OUT
(V)
I
OUT
(A)
FAN1616A
PRODUCT SPECIFICATION
REV. 1.0.4 8/9/01
3
Electrical Characteristics
Operating Conditions: V
IN
12V, 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. FAN1616A 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
)
5.75V,
10mA
I
OUT
0.5A
1.225
(-2%)
1.250
1.275
(+2%)
V
Output Voltage
4
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
1.764
2.450
3.234
4.900
1.800
2.500
3.300
5.000
1.836
2.550
3.366
5.100
V
V
V
V
Line Regulation
1,2
(V
OUT
+ 1.5V)
V
IN
12V, I
OUT
= 10mA
0.005
0.2
%
Load Regulation
1,2,3
(V
IN
V
OUT
) = 2V, 10mA
I
OUT
0.5A
0.05
0.5
%
Dropout Voltage
V
REF
= 1%, I
OUT
= 0.5A
1.000
1.200
V
Adjust Pin Current
3
35
120
A
Adjust Pin Current Change
3, 4
1.5V
(V
IN
V
OUT
)
12V,
10mA
I
OUT
0.5A
0.2
5
A
Minimum Load Current
1.5V
(V
IN
V
OUT
)
12V
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
= 0.5A
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-252
3
C/W
Thermal Shutdown
150
C
PRODUCT SPECIFICATION
FAN1616A
4
REV. 1.0.4 8/9/01
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
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
0
0
0.6
0.8
0.4
0.2
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
OUTPUT 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)
OUTPUT
V
O
L
T
A
GE DEVIA
T
ION (%)
1.0
-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
T
J
= 125
C
T
J
= 0
C
I = 0.5A
V
OUT
= 3.6V
1
V
OUT
SET WITH 1% RESISTORS
V
OUT
= 3.3V
Note:
1. FAN1616A Only
Note:
1. FAN1616A Only
Note:
1. FAN1616A Only
T
J
= 25
C
Figure 2. Dropout Voltage vs. Output Current
Figure 3. Load Regulation vs. Temperature
Figure 4. Reference Voltage vs. Temperature
Figure 5. Output Voltage vs. Temperature
Figure 6. Minimum Load Current vs. Temperature
Figure 7. Adjust Pin Current vs. Temperature
FAN1616A
PRODUCT SPECIFICATION
REV. 1.0.4 8/9/01
5
Typical Performance Characteristics
(continued)
4
3
2
1
0
PO
WER (W)
CASE TEMPERATURE (
C)
50
60 70 80 90 100 110 120
140
130
150
TO-252
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
= 0.5A
Figure 8. Ripple Rejection vs. Frequency
Figure 9. Maximum Power Dissipation