SS6721G/DG
150mA/300mA Low Dropout Linear Regulator
with 1% Output Accuracy
FEATURES
Low dropout voltage of 130mV at 100mA output
current (5V output version).
Guaranteed 150mA/300mA output current.
Internal 1.3Ω P-MOSFET draws no base-current.
Low ground current of 55µA.
Output voltage accuracy of 1% at 3.3V/5V.
Input voltage range up to 12V (5V output version)
Extremely tight load and line regulation.
Fast transient response.
Current limiting and thermal protection.
DESCRIPTION
The SS6721/6721D are 150/300mA low dropout
linear regulators. The superior characteristics of the
SS6721 and SS6721D include zero base-current
loss, very low dropout voltage, and 1% accuracy
of output voltage. Typical ground current is
approximately 55µA, across the load range
from zero to maximum. With an output current
of 100mA, the dropout voltage of the SS6721
and SS6721D is substantially lower (130mV for
SS6721-50 and SS6721D-50, and 180mV for the
SS6721-33 and SS6721D-33) when compared
with a bipolar device. Built-in output current and
thermal limiting provide maximum protection of the
SS6721 and SS6721D against fault conditions.
The SS6721 and SS6721D are available in
the popular SOT-89 and TO-92 packages.
RoHS compliant.
APPLICATIONS
LAN Cards.
Wireless Communication Systems.
Battery Powered Systems.
TYPICAL APPLICATION CIRCUIT
VIN
V
IN
SS6721/
SS6721D
VOUT
V
OUT
GND
+
1µF
C
IN
+
10µF
C
OUT
Low Dropout Linear Regulator
1/21/2005 Rev.2.01
www.SiliconStandard.com
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SS6721G/DG
ORDERING INFORMATION
SS6721X-XX XXXX
Packing
TR: Tape and reel
PACKAGE TYPE
X: SOT-89
Z: TO-92
G: RoHS compliant
SOT-89
Front view
1. VOUT
2. GND
3. VIN
TO-92
Front view
1. VOUT
2. GND
3.
VIN
PIN CONFIGURATION
1
2
3
1
2
3
Output voltage
Default: 3.3V
50: 5.0V
Output current:
Default: 150mA
D: 300mA
Example: SS6721GXTR
150mA, 3.3V version, in RoHS-compliant SOT-89,
shipped on tape and reel
SS6721D-50GZTR
300mA, 5.0V version, in RoHS-compliant TO-92,
shipped on tape and reel
SOT89 Marking
Part No.
SS6721GX
SS6721-50GX
Marking
AF33P
AF50P
Part No.
SS6721DGX
SS6721D-50GX
Marking
AG33P
AG50P
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage
Operating Junction Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Power Dissipation
SOT-89 Package
TO-92 Package
Lead Temperature (Soldering) 10 sec.
-0.3~12V
-40°C~ 85°C
125°C
-65°C~150°C
0. 80W
0.78W
260°C
Exceeding the
Absolute Maximum Ratings
may impair the
life of a device.
1/21/2005 Rev.2.01
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2 of 7
SS6721G/DG
TEST CIRCUIT
Refer to the TYPICAL APPLICATION CIRCUIT
ELECTRICAL CHARACTERISTICS
(T
j
= 25°C, C
IN
= 1µF, C
OUT
= 10µF, unless otherwise specified.)
PARAMETER
Output Voltage
Output Voltage
Temperature
Coefficient
Line Regulation
TEST CONDITIONS
SS6721/6721D-50 V
IN
=5.5 to12V, I
OUT
=0mA
SS6721/6721D
V
IN
=3.6 to12V, I
OUT
=0mA
(Note 1)
MIN.
4.950
3.267
TYP.
5.0
3.3
50
MAX.
5.050
3.333
150
UNIT
V
PPM/°C
Load Regulation
(Note 2)
Current Limit
(Note 3)
Dropout Voltage
(Note 4)
Ground Current
I
OUT
=1mA
SS6721/6721D-50
V
IN
=5.5 to12V
V
IN
=3.6 to12V
SS6721/6721D
SS6721-50
V
IN
=7V, I
OUT
=0.1 to 150mA
V
IN
=7V, I
OUT
=0.1 to 300mA
SS6721D-50
V
IN
=5V, I
OUT
=0.1 to 150mA
SS6721
SS6721D
V
IN
=5V, I
OUT
=0.1 to 300mA
SS6721-50
V
IN
=7V, V
OUT
=0V
V
IN
=5V, V
OUT
=0V
SS6721
V
IN
=7V, V
OUT
=0V
SS6721D-50
SS6721D
V
IN
=5V, V
OUT
=0V
SS6721-50
I
OUT
=150mA
I
OUT
=150mA
SS6721
I
OUT
=300mA
SS6721D-50
I
OUT
=300mA
SS6721D
I
OUT
=0.1mA to I
MAX
SS6721/6721D-50
V
IN
=5.5 to 12V
V
IN
=4 to 12V
SS6721/6721D
300
300
300
300
3
3
7
7
7
7
440
440
440
440
200
270
400
540
55
55
10
10
15
25
15
25
mV
mV
mA
300
370
500
640
80
80
mV
µA
Note 1:
Note 2:
Note 3:
Note 4:
Note5:
Guaranteed by design.
Regulation is measured at a constant junction temperature, which is maintained using pulse
testing.
Current limit is measured by pulse testing.
Dropout voltage is defined as voltage differential at which the output voltage drops 100mV with
an initial 1V differential between input and output.
Specifications over -40°C to 85°C operating temperature range are guaranteed by design with
Statistical Quality Controls (SQC), not production test.
1/21/2005 Rev.2.01
www.SiliconStandard.com
3 of 7
SS6721G/DG
TYPICAL PERFORMANCE CHARACTERISTICS
104
60
Normalized Output Voltage (%)
50
Ground Current (µA)
-40
0
0
50
100
125
103
40
100
30
20
98
10
96
0
0
2
4
6
8
10
Temperature (°C)
Fig. 1
Output Voltage vs. Temperature
Fig. 2
Input Voltage (V)
Ground Current vs. Input Voltage
60
600
58
500
V
OUT
=3.3V
Ground Current (µA)
Dropout Voltage (mV)
56
I
L
=300mA
I
L
=150mA
400
300
54
200
52
I
L
=0.1mA
V
OUT
=5.0V
100
50
-50
-25
0
25
50
75
100
125
0
0
50
100
150
2 00
25 0
300
Temperature (°C)
Fig. 3 Ground Current vs. Temperature
600
500
Load Current (mA)
Fig. 4
Dropout Voltage vs. Load Current
500
V
OUT
=5V
I
L
=300mA
SS6721D
Short Circuit Current (mA)
400
Dropout Voltage(mV)
400
300
I
L
=150mA
200
300
100
SS6721
I
L
=0.1mA
0
-50
-25
0
25
50
75
100
125
200
-50
-25
0
25
50
75
100
125
Temperature(°C)
Fig. 5 Dropout Voltage vs Temperature
Temperature (°C)
Fig. 6
Short Circuit Current vs. Temperature
1/21/2005 Rev.2.01
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SS6721G/DG
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
100
Output Voltage
(mV, AC)
50
0
-50
Output Voltage
(mV, AC)
100
0
C
OUT
=1µF
I
L
=1mA
V
OUT
=5V
-100
-200
C
OUT
=1µF
V
OUT
=5V
Load Current (mA)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Input Voltage
(V)
8
6
150
0.1
Time (mS)
Fig. 7 Line Transient Response
0
0.5
1.0
1.5
2.0
Time (mS)
2.5
3.0
3.5
4.0
4.5
5.0
Fig. 8
Load Transient Response
C
OUT
=10µF
Output Voltage
(mA, AC)
20
0
V
OUT
=5V
-20
-40
-60
Load Current
(mA)
150
0.1
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Fig. 9
Time (mS)
Load Transient Response
BLOCK DIAGRAM
VIN
VOUT
CURRENT
LIMITING
ERROR
AMP
THERMAL
LIMITING
-
+
-
+
V
REF
1.235V
GND
1/21/2005 Rev.2.01
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