www.fairchildsemi.com
REV. 1.0.8 5/20/02
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 2.5V, 3.3V or 5V
Applications
USB Controlled Power Supply
High efficiency linear regulators for
Mixed Voltage Logic, ASIC, FPGA based systems
Post regulators for switching supplies
Battery chargers
5V to 3.3V, or 2.5V, 1.8V, 1.5V linear regulators
Motherboard clock supplies
SDRAM Module supplies
Description
The RC1616 and RC1616-2.5, -3.3 and -5 are low dropout
three-terminal regulators with 0.5A output current capability.
These devices have been optimized for low voltage where
transient response and minimum input 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
RC1616 flows into the load, increasing efficiency.
The RC1616 series regulators are available in the industry-
standard SOT-223 and TO-252 power packages.
Typical Applications
V
IN
= 3.3V
V
IN
V
OUT
ADJ
1.5V at 0.5A
RC1616
10
F
22
F
124
24.9
V
IN
= 5V
V
IN
V
OUT
GND
3.3V at 0.5A
RC1616-3.3
10
F
+
+
+
+
22
F
RC1616
0.5A Adjustable/Fixed Low Dropout Linear Regulator
PRODUCT SPECIFICATION
RC1616
2
REV. 1.0.8 5/20/02
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
Parameter
Min.
Max.
Unit
V
IN
7.5
V
Operating Junction Temperature Range
0
125
C
Storage Temperature Range
-65
150
C
Lead Temperature (Soldering, 10 sec.)
300
C
Front View
Front View
RC1616S (Variable)
RC1616S-X (Fixed)
RC1616D (Variable)
RC1616D-X (Fixed)
4-Lead Plastic SOT-223
JC
= 15
C/W*
3-Lead Plastic TO-252
JC
= 3
C/W*
Tab is
V
OUT
3
2
1
IN
OUT
ADJ/GND
1
ADJ/
GND
OUT
IN
2
3
RC1616
PRODUCT SPECIFICATION
REV. 1.0.8 5/20/02
3
Electrical Characteristics
Operating Conditions: V
IN
7V, 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. RC1616 only.
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
10mA
I
OUT
0.5A
RC1616-2.5, 4.0V
V
IN
7V
RC1616-3.3, 4.5V
V
IN
7V
RC1616-5, 6.2V
V
IN
7V
2.450
3.234
4.900
2.500
3.300
5.000
2.550
3.366
5.100
V
V
V
Line Regulation
1,2
(V
OUT
+ 1.5V)
V
IN
7V, 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
1.5V
(V
IN
V
OUT
)
5.75,
10mA
I
OUT
0.5A
0.2
5
A
Minimum Load Current
1.5V
(V
IN
V
OUT
)
5.75
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, Junction
to Case
SOT-223
15
C/W
TO-252
3
C/W
Thermal Shutdown
150
C
PRODUCT SPECIFICATION
RC1616
4
REV. 1.0.8 5/20/02
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
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
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
REFERENCE 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
TION (%)
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. RC1616 Only
Note:
1. RC1616 Only
T
J
= 25
C
Figure 1. Dropout Voltage vs. Output Current
Figure 2. Load Regulation vs. Temperature
Figure 3. Reference Voltage vs. Temperature
Figure 4. Output Voltage vs. Temperature
Figure 5. Minimum Load Current vs. Temperature
Figure 6. Adjust Pin Current vs. Temperature
RC1616
PRODUCT SPECIFICATION
REV. 1.0.8 5/20/02
5
Typical Performance Characteristics
(continued)
1.50
1.25
1.00
0.75
0.50
SHOR
T
-CIRCUIT CURRENT (A)
TEMPERATURE (
C)
-75 -50 -25 0
25 50 75 100 125 150 175
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 7. Short-Circuit Current vs. Temperature
Figure 8. Ripple Rejection vs. Frequency
Figure 9. Maximum Power Dissipation
PRODUCT SPECIFICATION
RC1616
6
REV. 1.0.8 5/20/02
Mechanical Dimensions
3-Lead TO-252 Package
A
.086
.094
2.19
2.39
Symbol
Inches
Min.
Max.
Min.
Max.
Millimeters
Notes
b
.025
.035
0.64
0.89
.045
1.14
b2
.030
0.76
c
.018
.024
0.46
0.61
c2
.018
.023
0.46
0.58
D
.210
.245
5.33
6.22
1
4
1
4
3
E
.250
.265
6.35
6.73
.090 BSC
2.29 BSC
.108 REF
2.74 REF
.370
.410
9.40
10.41
e
H
L
.055
.070
1.40
1.78
L1
.035
.080
0.89
2.03
.025
.040
0.64
1.02
.215
5.46
b3
.205
5.21
L3
L4
E
b3
@PKG/
@HEATSINK
D
L3
A
-C-
H
c2
L
L1
-A-
= 0 10
-B-
E-PIN
b2
L4
b
e
Notes:
1.
2.
3.
4.
5.
6.
Dimensions are exclusive of mold flash, metal burrs or interlead
protrusion.
Stand off-height is measured from lead tip with ref. to Datum -B-.
Foot length is measured with ref. to Datum -A- with lead surface.
Thermal pad contour optional within dimension b3 and L3.
Formed leads to be planar with respect to one another at seating
place -C-.
Dimensions and tolerances per ASME Y14.5M-1994.
RC1616
PRODUCT SPECIFICATION
REV. 1.0.8 5/20/02
7
Mechanical Dimensions
4-Lead SOT-223 Package
A
--
.071
Symbol
Inches
Min.
Max.
Min.
Max.
Millimeters
Notes
A1
--
.181
.033
B
.025
c
--
.090
E
.130
.148
e
H
.264
.287
.115
.124
.033
.041
--
10
F
F
I
J
D
.248
.264
--
1.80
--
4.80
.840
.640
--
2.29
3.30
3.71
6.71
7.29
.012
--
.310
--
2.95
3.15
.840
1.04
--
10
10
16
K
10
16
.0008
.0040
L
.0203
.1018
10
16
M
10
16
.010
.014
N
.250
.360
6.30
6.71
A
D
e
E
c
H
A1
B
I
J
K
L
M
N
PRODUCT SPECIFICATION
RC1616
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
5/20/02 0.0m 004
Stock#DS30001616
2002 Fairchild Semiconductor Corporation
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
Ordering Information
Product Number
Package
RC1616D
TO-252
RC1616S
SOT-223
RC1616D-2.5
TO-252
RC1616S-2.5
SOT-223
RC1616D-3.3
TO-252
RC1616S-3.3
SOT-223
RC1616D-5
TO-252
RC1616S-5
SOT-223
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