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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 Applications

n Maximum output current: 500mA

n Highly accurate: Output voltage ± 1.4%

(±1% for semi-custom products)

n Low power consumption

n Over-Current and Over-temperature

Protection

n Small input/output differential: 0.3V at

300mA

n Wireless Communication Systems

n Battery-Operated Systems

n Portable Computer

n Portable Cameras and Video Recorders

n Voltage Regulator for Microprocessor

n Reference Voltage Sources

n Voltage Regulator for CD-ROM Drivers,

LAN Cards and DVD.

n Instrumentation

n Pagers

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Block Diagram

VIN

0.9V

REFERENCE

THERMAL

SHUTDOWN

CURRENT

LIMITING

1 3

2

VOUT

GND

Packages & Pin Assignments

GS2905Y (SOT-89) GS2905X (SOT-223)

123

Pin1 = GND

Pin2 = VIN

Pin3 = VOUT

1

2

3

Pin1 = GND

Pin2 = VIN

Pin3 = VOUT

Ordering Information

SOT-89 SOT-223 Output

GS2905Y15 GS2905X15 1.5V

GS2905Y18 GS2905X18 1.8V

GS2905Y25 GS2905X25 2.5V

GS2905Y33 GS2905X33 3.3V

GS2905Y36 GS2905X36 3.6V

GS2905Y50 GS2905X50 5.0V

*GS2905XF, X means package type and F means Lead Free part.

*For other output voltages, please contact factory.

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Absolute Maximum Ratings

Symbol Parameter Maximum Unit

SOT-89 120

uJA Thermal Resistance SOT223 100 °C/W

VIN Input Voltage 6.5 V

IOUT Output Current 500 mA

VOUT Output Voltage VSS-0.3 to VIN+0.3 V

TJ Operating Junction Temperature 0 to 70 °C

TSTG Storage temperature Range -65 to 150 °C

TLEAD Lead Temperature (Soldering, 10 sec)

300 °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 Test

Circuit

Min Typ.

Max Unit

Output Voltage Accuracy

IOUT = 1mA

IOUT = 0.1mA to 500mA (TA=25°C)

-1.4%

-4.5%

-

1.4%

2.0%

V

Line regulation

V△OUT/( V△INXV△OUT)

IOUT = 1mA

(VOUT+0.1V)＜VIN＜6.5V

Fig. 1 - 0.1 0.3 %/V

Load Regulation (Note1)

VIN=6V

0.1mA＜IOUT＜500mA, COUT=1µF

Fig. 2 - 0.005

0.04 %/mA

Maximum output current

VIN=5V

VOUT＞0.96 X VRATING

500 mA

Current Limit 500 mA

Ground Pin Current IOUT= 0mA~ 500mA Fig. 3 - 15 30 µA

Dropout Voltage

For VOUT＞2.5V IOUT=100mA

IOUT=500mA

100

600

180

900 mV

For 2.0V＜VOUT 2≦.5V IOUT=100mA

IOUT=500mA

150

750

300

900 mV

For VOUT 2≦.0V IOUT=100mA

IOUT=500mA

200

1100

400

1500

mV

Note1: Load Regulation is measured using pulse techniques with duty cycle＜5%

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Test Circuits

Line Regulation Figure. 1

6.5V

3.4V

Io=1mA

GND 1mF

VOUT

VIN

GS2905-3.3

2

3

1

Load Regulation Figure. 2

13

2

GS2905-3.3

VIN=6V

VOUT

1mFGND

1mFIo=500mA

0.1mA

PULSE WITH DUTY

CYCLES 5%

Ground Current Figure. 3

GND

VOUT

VIN=3.8V

GS2905-3.3

2

3

1

Io=100mA

33V

mA

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Typical Performance Characteristics

Output Voltage VS. Temperature Ground Current VS. Input Voltage

102

101

100

99

98

NORMALIZED OUTPUT VOLTAGE(%)

015 30 45 60 75 90

TEMPERATURE(8C)

15.0

10

5.0

INPUT VOLTAGE(V)

GROUND CURRENT(mA)

0123 4 5 6 7 8

Load Transient Response

5

4321

0

1

300

-40

0

20

TIME(ms)

-60

-20

LOAD

CURRENT(mA) OUTPUT

VOLTAGE(mV,AC)

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Typical Applications

Low Dropout Linear Regulator

3

2

GS2905-3.3

1mF

GND

1

1mF

CIN COUT

VIN VOUT

A 1µF (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 -30°C, so

solid tantalums are recommended for operation below -25°C. The value of this capacitor

may be increased without limit.

A 0.1µF 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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Package Dimension

SOT-223 PLASTIC PACKAGE

Dimensions In Millimeters Dimensions In Inches

Symbol Min Max Min Max

A 1.520 1.800 0.060 0.071

A1 0.020 0.100 0.001 0.004

A2 1.500 1.700 0.059 0.067

b 0.610 0.810 0.024 0.032

c 0.250 0.350 0.010 0.014

D 6.300 6.700 0.248 0.264

D1 2.900 3.100 0.114 0.122

E 3.300 3.700 0.130 0.146

E1 6.700 7.300 0.264 0.287

e 2.300 (TYP) 0.091 (TYP)

e1 4.500 4.700 0.177 0.185

L 1.750 (TYP) 0.069 (TYP)

L1 0.900 0.035

Θ

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SOT-89 PLASTIC PACKAGE

Dimensions In Millimeters Dimensions In Inches

Symbol Min Max Min Max

A 1.450 1.550 0.570 0.061

b 0.440 0.480 0.017 0.019

C 0.360 0.400 0.014 0.016

E 4.450 4.550 0.175 0.179

E2 1.500 1.700 0.059 0.067

E3 1.400 (TYP) 0.055 (TYP)

e 1.500 (TYP) 0.059 (TYP)

e1 3.000 (TYP) 0.118 (TYP)

H 4.150 4.250 0.163 0.167

D 2.450 2.550 0.096 0.100

L 0.900 1.100 0.035 0.043

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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.