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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% n
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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
VIN
1
CURRENT LIMITING THERMAL SHUTDOWN
3
VOUT
0.9V REFERENCE
2 GND
Packages & Pin Assignments
GS2905Y (SOT-89) GS2905X (SOT-223)
1
1 2 3
2
3
Pin1 = GND Pin2 = VIN Pin3 = VOUT
Pin1 = GND Pin2 = VIN Pin3 = VOUT
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 uJA VIN IOUT VOUT TJ TSTG TLEAD 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 VSS-0.3 to VIN +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 VOUT (T) =2.0 (Note 1)
Parameter Conditions IOUT = 1mA IOUT = 0.1mA to 500mA (TA=25C) Line regulation VOUT/(VINXVOUT) Load Regulation (Note1) IOUT = 1mA (VOUT+0.1V)OVINO 6.5V V IN=6V 0.1mAOIOUTO 500mA, C OUT=1F Maximum output current V IN=5V VOUT O 0.96 X VRATING Current Limit Ground Pin Current Dropout Voltage For VOUTO 2.5V IOUT=100mA IOUT=500mA For 2.0VOVOUTO2.5V IOUT=100mA IOUT=500mA For VOUTO2.0V IOUT=100mA IOUT=500mA Note1: Load Regulation is measured using pulse techniques with duty cycleO5% 100 600 150 750 200 1100 180 900 300 900 400 1500 mV mV mV IOUT= 0mA~500mA Fig. 3 500 15 30 mA A 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
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GS2905
GS2905
Globaltech Semiconductor
Test Circuits
Line Regulation
6.5V 3.4V
Figure. 1
1 2
VIN VOUT Io=1mA
1mF
GS2905-3.3 3 GND
Load Regulation
Figure. 2
VIN=6V 1 GS2905-3.3 3
1mF
PULSE WITH DUTY CYCLES 5%
VOUT
2 GND
1mF 0.1mA Io=500mA
Ground Current
Figure. 3
VIN=3.8V 1 GS2905-3.3 3 2 GND
mA
VOUT
33V
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(mA)
15.0
100 99
10
5.0
98 0
15
30
45
60
75 90
0
1
2
3
4
5
6
78
TEMPERATURE(8C)
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(ms) 4 5
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GS2905
GS2905
Globaltech Semiconductor
Typical Applications
Low Dropout Linear Regulator
VIN 1 GS2905-3.3 3 CIN
1mF
VOUT 2 GND COUT
1mF
A 1F (or greater) capacitor is required between the GS2905 output and ground for stability. Without this capacitor the part will oscillate. Even though most types of capacitor may work, the equivalent series resistance (ESR) should be held to 5 or less if Aluminum electrolytic type is used. Many Aluminum electrolytic have electrolytes that freeze at about -30C, so solid tantalums are recommended for operation below -25C. The value of this capacitor may be increased without limit. A 0.1F capacitor (or greater) should be placed from the GS2905 input to ground if the lead inductance between the input and power source exceeds 500nH (approximately 10 inches of trace).
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GS2905
GS2905
Globaltech Semiconductor
Package Dimension
SOT-223 PLASTIC PACKAGE
K
Symbol A A1 A2 b c D D1 E E1 e e1 L L1
Dimensions In Millimeters Min 1.520 0.020 1.500 0.610 0.250 6.300 2.900 3.300 6.700 Max 1.800 0.100 1.700 0.810 0.350 6.700 3.100 3.700 7.300
Dimensions In Inches Min 0.060 0.001 0.059 0.024 0.010 0.248 0.114 0.130 0.264 0.091 (TYP) 0.177 0.069 (TYP) 0.035 0.185 Max 0.071 0.004 0.067 0.032 0.014 0.264 0.122 0.146 0.287
2.300 (TYP) 4.500 4.700
1.750 (TYP) 0.900
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GS2905
GS2905 SOT-89 PLASTIC PACKAGE
Globaltech Semiconductor
Symbol A b C E E2 E3 e e1 H D L
Dimensions In Millimeters Min 1.450 0.440 0.360 4.450 1.500 1.400 (TYP) 1.500 (TYP) 3.000 (TYP) 4.150 2.450 0.900 4.250 2.550 1.100 Max 1.550 0.480 0.400 4.550 1.700
Dimensions In Inches Min 0.570 0.017 0.014 0.175 0.059 0.055 (TYP) 0.059 (TYP) 0.118 (TYP) 0.163 0.096 0.035 0.167 0.100 0.043 Max 0.061 0.019 0.016 0.179 0.067
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GS2905
GS2905
Globaltech Semiconductor
Information furnished is believed to be accurate and reliable. However Globaltech Semiconductor assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Globaltech Semiconductor. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information without express written approval of Globaltech Semiconductor.
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GS2905

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