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RC1616
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 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
Typical Applications
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 industrystandard SOT-223 and TO-252 power packages.
V
= 3.3V V
IN
V
10µF22µF
= 5V V
IN
+
10µF
RC1616
ADJ
GND
V
OUT
124Ω
24.9Ω
V
OUT
22µF
IN
RC1616-3.3
++
IN
+
3.3V at 0.5A
1.5V at 0.5A
REV. 1.0.8 5/20/02
°
°
°
PRODUCT SPECIFICATION RC1616
Pin Assignments
RC1616S (Variable)
RC1616S-X (Fixed)
Front View Front View
3
IN
Tab is
V
OUT
4-Lead Plastic SOT-223
ΘJC = 15°C/W*
2
1
OUT
ADJ/GND
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, Θ
RC1616D (Variable)
RC1616D-X (Fixed)
2
OUT
= 3°C/W*
JC
3
IN
1
ADJ/
GND
3-Lead Plastic TO-252
Θ
can vary from
JA
30°C/W to >50°C/W. Other mounting techniques may provide better power dissipation than 30°C/W.
Absolute Maximum Ratings
Parameter Min. Max. Unit
V
IN
Operating Junction Temperature Range 0 125
Storage Temperature Range -65 150
Lead Temperature (Soldering, 10 sec.) 300
7.5 V
C
C
C
2
REV. 1.0.8 5/20/02
≤
) ≤
≤
•
≤
≤
≤
≤
≤
≤
∆
•
•
µ
) ≤
≤
•
µ
) ≤
•
•
•
°
°
°
RC1616 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
3
Output Voltage 10mA ≤ I
Line Regulation
Load Regulation
1,2
1,2,3
Dropout Voltage
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 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. RC1616 only.
IN
7V, T
= 25°C unless otherwise specified.
J
1.5V ≤ (V
10mA ≤ I
RC1616-2.5, 4.0V ≤ V
RC1616-3.3, 4.5V ≤ V
RC1616-5, 6.2V ≤ V
(V
OUT
(V
– V
IN
V
REF
3
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
0.5A
OUT
0.5A
OUT
+ 1.5V) ≤ V
) = 2V, 10mA ≤ I
OUT
= 1%, I
IN
OUT
IN
OUT
OUT
OUT
– V
OUT
0.5A
– V
OUT
+ 1.25V
OUT
) = 3V, I
5.75V,
7V
IN
7V
IN
7V
IN
7V, I
IN
= 10mA •
OUT
OUT
= 0.5A
5.75,
5.75
= 22 µ F Tantalum,
= 0.5A
OUT
0.5A •
1.225
(-2%)
•
2.450
•
3.234
•
4.900
SOT-223 15
TO-252 3
1.250 1.275
V
(+2%)
2.500
3.300
5.000
2.550
3.366
5.100
V
V
V
0.005 0.2 %
0.05 0.5 %
1.000 1.200 V
35 120
0.2 5
10 mA
413mA
60 72 dB
0.5 %
C/W
C/W
C
A
A
REV. 1.0.8 5/20/02
3
PRODUCT SPECIFICATION RC1616
Typical Performance Characteristics
1.5 0.10
1.4
1.3
1.2
1.1
1.0
DROPOUT VOLTAGE (V)
0.9
0.8
0.7
0.6
0.5
TJ = 0°C
0
0 0.6 0.80.40.2
OUTPUT CURRENT (A) JUNCTION TEMPERATURE (°C)
TJ = 25°C
TJ = 125°C
OUTPUT VOLTAGE DEVIATION (%)
1.0 -75 -50 -25 0 25 50 75 100 125 150 175
∆I = 0.5A
0.05
0
-0.05
-0.10
-0.15
-0.20
Figure 1. Dropout Voltage vs. Output Current Figure 2. Load Regulation vs. Temperature
REFERENCE VOLTAGE (V)
3.70
3.65
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
V
SET WITH 1% RESISTORS
OUT
V
OUT
Note:
1. RC1616 Only
= 3.3V
V
OUT
= 3.6V
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
REFERENCE VOLTAGE (V)
1.205
1.200
-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) JUNCTION TEMPERATURE (°C)
Figure 3. Reference Voltage vs. Temperature Figure 4. Output Voltage vs. Temperature
1
5
4
3
2
1
MINIMUM LOAD CURRENT (mA)
0
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
100
90
80
70
60
50
40
30
20
ADJUST PIN CURRENT (µA)
10
0
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Note:
1. RC1616 Only
Figure 5. Minimum Load Current vs. Temperature Figure 6. Adjust Pin Current vs. Temperature
4
REV. 1.0.8 5/20/02
RC1616 PRODUCT SPECIFICATION
Typical Performance Characteristics
1.50
1.25
1.00
0.75
SHORT-CIRCUIT CURRENT (A)
0.50
-75 -50 -25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
(continued)
90
80
70
60
50
40
30
RIPPLE REJECTION (dB)
0.5 ≤ V
10
I
OUT
0
10 100 1K 10K 100K
(VIN - V
20
) ≤ 3V
OUT
≤ 2V
RIPPLE
= 0.5A
FREQUENCY (Hz)
Figure 7. Short-Circuit Current vs. Temperature Figure 8. Ripple Rejection vs. Frequency
4
TO-252
3
2
POWER (W)
1
0
50 60 70 80 90 100 110 120 140130 150
SOT-223
CASE TEMPERATURE (°C)
Figure 9. Maximum Power Dissipation
REV. 1.0.8 5/20/02
5
PRODUCT SPECIFICATION RC1616
Mechanical Dimensions
3-Lead TO-252 Package
Symbol
A .086 .094 2.19 2.39
b .025 .035 0.64 0.89
b2 .030 0.76
b3 .205 5.21
c .018 .024 0.46 0.61
c2 .018 .023 0.46 0.58
D .210 .245 5.33 6.22 1
E .250 .265 6.35 6.73
e
H
L .055 .070 1.40 1.78
L1
L3
L4
D
H
Inches
Min. Max. Min. Max.
.045 1.14
.215 5.46
.090 BSC 2.29 BSC
.370 .410 9.40 10.41
.108 REF 2.74 REF
.035 .080 0.89 2.03
.025 .040 0.64 1.02
E
@PKG/
@HEATSINK
b3
Millimeters
L3
E-PIN
Notes
Notes:
1.
Dimensions are exclusive of mold flash, metal burrs or interlead
protrusion.
2.
Stand off-height is measured from lead tip with ref. to Datum -B-.
3.
Foot length is measured with ref. to Datum -A- with lead surface.
4
1
3
4
4.
Thermal pad contour optional within dimension b3 and L3.
5.
Formed leads to be planar with respect to one another at seating
place -C-.
6.
Dimensions and tolerances per ASME Y14.5M-1994.
c2
-C-
L4
L1
-B-
L
α = 0° – 10°
-A-
b2
b
e
A
6
REV. 1.0.8 5/20/02
RC1616 PRODUCT SPECIFICATION
Mechanical Dimensions
4-Lead SOT-223 Package
Symbol
A — .071
A1 — .181
B .025
c — .090
D .248 .264
E .130 .148
e
F
H .264 .287
I
J
K
M
E
H
Inches
Min. Max. Min. Max.
.033
.115 .124
.033 .041
.012 — .310 —
— 10°
10° 16°
.0008 .0040L.0203 .1018
10° 16°
.010 .014N.250 .360
Millimeters
— 1.80
— 4.80
.640
— 2.29
6.30 6.71
3.30 3.71
2.95 3.15
.840 1.04
6.71 7.29
— 10°
10° 16°
10° 16°
D
e
.840
A
Notes
K
J
B
I
L
M
N
A1
c
F
REV. 1.0.8 5/20/02 7
PRODUCT SPECIFICATION RC1616
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
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.
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.
www.fairchildsemi.com
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.
5/20/02 0.0m 004
2002 Fairchild Semiconductor Corporation
Stock#DS30001616
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