GS2905
500mA CMOS LDO Voltage Regulator
Product Description
The GS2905 series is a group of positive voltage output, three-pin regulators, that provide
a high current even when the input/output voltage differential is small. Low power
consumption and high accuracy is achieved through CMOS and programmable fuse
technologies. Output voltage: 1.5V to 6.0V.
The GS2905 consists of a high-precision voltage reference, an error correction circuit, and
a current limited output driver. Transient response to load variations has improved in
comparison to the existing series.
The GS2905 incorporates both over-temperature and over-current protection. SOT-89 and
SOT-223 packages are available.
Features
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Applications
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Maximum output current: 500mA
(± 1% for semi-custom products)
Wireless Communication Systems
Battery-Operated Systems
Portable Computer
Portable Cameras and Video Recorders
Voltage Regulator for Microprocessor
Reference Voltage Sources
Voltage Regulator for CD- ROM Drivers,
LAN Cards and DVD.
Instrumentation
Pagers
Highly accurate: Output voltage ± 1.4%
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Low power consumption
Over-Current and Over-temperature
Protection
Small input/output differential:0.3V at
300mA
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GS2905
GS2905
Globaltech Semiconductor
Block Diagram
V
IN
1
CURRENT
LIMITING
THERMAL
SHUTDOWN
3
V
OUT
0.9V
REFERENCE
2 GND
Packages & Pin Assignments
GS2905Y (SOT-89)
GS2905X (SOT-223)
1
1
2
3
2
3
Pin1 = GND
Pin2 = V
IN
Pin3 = V
OUT
Pin1 = GND
Pin2 = V
IN
Pin3 = V
OUT
Ordering Information
SOT-89
GS2905Y15
GS2905Y18
GS2905Y25
GS2905Y33
GS2905Y36
SOT-223
GS2905X15
GS2905X18
GS2905X25
GS2905X33
GS2905X36
Output
1.5V
1.8V
2.5V
3.3V
3.6V
5.0V
GS2905Y50
GS2905X50
*GS2905XF, X means package type and F means Lead Free part.
*For other output voltages, please contact factory.
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GS2905
GS2905
Globaltech Semiconductor
Absolute Maximum Ratings
Symbol
u
JA
V
IN
I
OUT
V
OUT
T
J
T
STG
T
LEAD
Parameter
Thermal Resistance
Input Voltage
Output Current
Output Voltage
Operating Junction Temperature
Storage temperature Range
Lead Temperature (Soldering, 10 sec)
SOT-89
SOT223
Maximum
120
100
6.5
500
V
SS
-0.3 to V
IN
+0.3
0 to 70
-65 to 150
300
Unit
°C/W
V
mA
V
°C
°C
°C
Note:
Stresses above those listed under “
Absolute Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions above those
indicated in the operation sections of the specifications is not implied.
Exposure to Absolute Maximum Ratings conditions for extended periods may affect device reliability.
Electrical Characteristics
V
OUT
(T) =2.0 (Note 1)
Parameter
Conditions
I
OUT
= 1mA
I
OUT
= 0.1mA to 500mA (TA=25
°C)
I
OUT
= 1mA
(V
OUT
+0.1V)＜V
IN
＜6.5V
V
IN
=6V
0.1mA＜I
OUT
＜500mA,
C
OUT
=1µF
Maximum output current
V
IN
=5V
V
OUT
＞0.96
X V
RATING
Current Limit
Ground Pin Current
Dropout Voltage
For V
OUT
＞2.5V
I
OUT
=100mA
I
OUT
=500mA
For 2.0V＜V
OUT
≦
2.5V
I
OUT
=100mA
I
OUT
=500mA
For V
OUT
≦
2.0V
I
OUT
=100mA
I
OUT
=500mA
Note1:
Load Regulation is measured using pulse techniques with duty cycle＜5%
100
600
150
750
200
1100
180
900
300
900
400
1500
mV
mV
mV
I
OUT
= 0mA~500mA
Fig. 3
500
-
15
30
mA
µA
500
mA
Fig. 2
-
0.005
0.04
%/mA
Fig. 1
Test
Circuit
Min
-1.4%
-4.5%
-
Typ.
-
-
0.1
Max
1.4%
2.0%
0.3
%/V
Unit
Output Voltage Accuracy
V
Line regulation
△
V
OUT
/(
△
V
IN
X
△
V
OUT
)
Load Regulation (Note1)
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GS2905
GS2905
Globaltech Semiconductor
Test Circuits
Line Regulation
6.5V
3.4V
Figure. 1
1
2
V
IN
V
OUT
Io=1mA
1
m
F
GS2905-3.3
3
GND
Load Regulation
Figure. 2
V
IN
=6V
1
GS2905-3.3
3
1
m
F
PULSE WITH DUTY
CYCLES 5%
V
OUT
2
GND
1
m
F
0.1mA Io=500mA
Ground Current
Figure. 3
V
IN
=3.8V
1
GS2905-3.3
3
2
GND
m
A
V
OUT
33
V
Io=100mA
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GS2905
GS2905
Globaltech Semiconductor
Typical Performance Characteristics
Output Voltage VS. Temperature
NORMALIZED OUTPUT VOLTAGE(%)
102
Ground Current VS. Input Voltage
101
GROUND CURRENT(
m
A)
15.0
100
99
10
5.0
98
0
15
30
45
60
75 90
0
1
2
3
4
5
6
7 8
TEMPERATURE(
8
C)
INPUT VOLTAGE(V)
Load Transient Response
OUTPUT
VOLTAGE(mV,AC)
LOAD
CURRENT(mA)
20
0
-20
-40
-60
300
1
0
1
2
3
TIME(
m
s)
4
5
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GS2905
