Fairchild Semiconductor RC1616X25 Datasheet
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 industrystandard SOT-223 and TO-252 power packages.
Typical Applications
V
IN
= 3.3V V
IN
V
OUT
ADJ
1.5V at 0.5A
RC1616
10µF22µF
124Ω
24.9Ω
V
IN
= 5V V
IN
V
OUT
GND
3.3V at 0.5A
RC1616-3.3
10µF
++
+
+
22µF
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, 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 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
ΘJC = 15°C/W*
3-Lead Plastic TO-252
Θ
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
= 25°C 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
µ
A
Adjust Pin Current Change
3
1.5V ≤ (V
IN
– V
OUT
) ≤
5.75,
10mA ≤ I
OUT
≤
0.5A
•
0.2 5
µ
A
Minimum Load Current 1.5V ≤ (V
IN
– V
OUT
) ≤
5.75
•
10 mA
Quiescent Current V
IN
= V
OUT
+ 1.25V
•
413mA
Ripple Rejection f = 120Hz, C
OUT
= 22 µ 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
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