SPX2940U-3.3中文资料

DESCRIPTION

FEATURES

■Guaranted 1.5A Peak Current ■Low Quiescent Current

■Low Dropout Voltage of 280mV at 1A

■Extremely Tight Load and Line Regulation ■Extremely Fast Transient Response ■Reverse-battery Protection ■Internal Thermal Protection

■Internal Short Circuit Current Limit ■Replacement for LM2940, MIC2940A,AS2940

■

Standard TO-220 and TO-263 packages The SPX2940 is a 1A, accurate voltage regulators with a low drop out voltage of 280mV (typical)at 1A. These regulators are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. They are fully fault protected against over-current,reverse battery, and positive and negative voltage transients.

The SPX2940 is offered in 3-pin TO-220 & TO-263 packages. For a 3A version, refer to the SPX29300 data sheet.

V OUT

V F

Figure 1. Fixed Output Linear Regulator.

TYPICAL APPLICATIONS CIRCUIT

APPLICATIONS

■Powering VGA & Sound Card ■LCD Monitors

■USB Power Supply ■Power PC TM Supplies ■SMPS Post-Regulator

■PDA or Notebook Computer

■High Efficiency Linear Power Supplies ■Portable Instrumentation ■Constant Current Regulators ■Cordless Telephones ■

Automotive Electronics

Now Available in Lead Free Packaging

IN OUT

ABSOLUTE MAXIMUM RATINGS

Lead Temperature (soldering, 5 seconds).................................260°C Storage Temperature Range.....................................-65°C to +150°C Operating Junction Temperature Range ...................-40°C to +125°C Input Voltage (Note 5)...................................................................16V

NOTES:

Note 1: Dropout voltage is defined as the input to output differential when the output voltage drops to 99% of its normal value.

Note 2: V IN =V OUT (NOMINAL) + 1V. For example, use V IN =4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise.Note 3: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current.

Note 4: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation

effects.

Note 5: Maximum positive supply voltage of 20V must be of limited duration (<100ms) and duty cycle (<1%). The maximum continuous supply voltage is 16V.

at V IN =V OUT + 1V and I OUT = 10 mA, C IN = 6.8 μF, C OUT = 10μF; T A = 25°C, unless otherwise specified. The Boldface applies over the junction temperature range. Adjustable versions are set at 5.0V.

PARAMETER CONDITIONS

TYP MIN MAX UNITS 1.8V Version Output Voltage I OUT = 10mA

1.8 1.746 1.854V

10mA ≤I OUT ≤1A, 6V ≤V IN ≤16V 1.8 1.710 1.890 2.5V Version Output Voltage I OUT = 10mA

2.5 2.425 2.575V

10mA ≤I OUT ≤1A, 6V ≤V IN ≤16V 2.5 2.375 2.6253.3V Version Output Voltage I OUT = 10mA

3.3 3.201 3.399V

10mA ≤I OUT ≤1A, 6V ≤V IN ≤16V 3.3 3.135 3.4655.0V Version Output Voltage I OUT = 10mA

5.0 4.850 5.150V

10mA ≤I OUT ≤1A, 6V ≤V IN ≤16V 5.0 4.750

5.250All Voltage Options Line Regulation I O =10mA, (V OUT +1V)≤V IN ≤16V 0.2 1.0%Load Regulation V IN =V OUT +1V, 10mA ≤I OUT ≤1A 0.3 1.5%?V Output Voltage 20100ppm/°C ?T

Temperature Coef.Dropout Voltage (Note 1)I O =100mA 70200mV (except 1.8V version)I O =1A

280550Ground Current (Note 3)I O =750mA, V IN =V OUT , + 1V 1225

mA I O =1A

18I GNDDO Ground Pin V IN =0.1V less than specified V OUT 1.2mA

Current at Dropout I OUT = 10mA

Current Limit

V OUT =0V (Note 2) 2.2 1.5

A Output Noise Voltage C L = 10μF

400

μV RMS

10Hz to 100kHz)I L =100mA

C L =33μF 260Thermal Resistance

TO-220 Junction to Case, at Tab 3TO-220 Junction to Ambient 60°C/W

TO-263 Junction to Case, at Tab 3TO-263 Junction to Ambient 60

ELECTRICAL CHARACTERISTICS

Figure 2. Line Regulation Figure 3. Load Regulation

Figure 4. Ground Current vs Load Current Figure 5. Ground Current vs Input Voltage

IN

GND

BLOCK DIAGRAM

TYPICAL PERFORMANCE CHARACTERISTICS

Figure 6. Ground Current vs Current in Dropout Figure 7. Dropout Voltage vs Load Current

Figure 8. Ground Current vs Temperature at Figure 9. Output Voltage vs Temperature at I LOAD = 10mA I LOAD =10mA

Figure 10. Ground Current vs Temperature at Figure 11. Ground Current vs Temperature in Dropout I LOAD =500mA at I LOAD =750mA

TYPICAL PERFORMANCE CHARACTERISTICS

Figure 12. Ground Current vs Temperature at I LOAD = 1.5A

Figure 13. Ground Current vs Temperature in Dropout at I LOAD

=1.5A

Figure 14. Dropout Voltage vs Temperature at I LOAD

= 750mA Figure 15. Dropout Voltage vs Temperature at

I LOAD = 1.5mA

Figure 16. Enable Current vs Temperature for V EN

= 16V

Figure 17. Enable Threshold vs Temperature

TYPICAL PERFORMANCE CHARACTERISTICS

The SPX2940 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and nega-tive transient voltage.

Thermal Considerations

Although the SPX2940 offers limiting circuitry for overload conditions, it is still necessary to insure that the maximum junction temperature is not exceeded in the application. H eat will flow through the lowest resistance path, the junction-to-case path. In order to insure the best thermal flow of the component, proper mount-ing is required. Consult heatsink manufacturer for thermal resistance and design of heatsink.

For example, TO-220 design:

Assume that V IN = 10V, V OUT = 5V, I OUT = 1.5A,T A = 50°C/W, θHA = 1°C/W, θCH = 2°C/W, and θJC = 3°C/W.

Where TA = ambient temperature

θHA = heatsink to ambient thermal resistance θCH = case to heatsink thermal resistance θJC = junction to case thermal resistance The power calculated under these conditions is:P D = (V IN - V OUT ) * I OUT = 7.5W.

And the junction temperature is calculated as T J = T A + P D * (θHA + θCH + θJC ) or T J = 50 + 7.5 * (1 + 2 + 3) = 95°C Reliable operation is insured.

Capacitor Requirements

The output capacitor is needed to insure stability and minimize the output noise. The value of the capacitor varies with the load. However, a minimum value of 10μF aluminum capacitor will guarantee stability over all load conditions. A tantalum capacitor is recommended if a faster load transient response is needed.

If the power source has a high AC impedance, a 0.1μF ceramic capacitor between input & ground is recommended.

Minimum Load Current

To ensure a proper behavior of the regulator under light load, a minimum load of 5mA for SPX2940is required.

APPLICATION INFORMATION

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PACKAGE: 3 PIN TO-263

View C

BASE METAL

SECTION B-B

3 PIN TO-263

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CONTACT AREA

.140 - .190.020 - .055Dimensions in (mm)

3 PIN TO-220JEDEC TO-220(AB) V ariation

.080 - .115.015 .027 .040.045 - .070 .480 - .507A A1A2b b2D1D2 .380 - .420E MIN NOM MAX

c .014 - .024D .560 - .650.330 - .355E1.270-.350E2 - - .030

e .100 BSC e1.200 BSC H1.230 - .270L1- - .250L2- - -?P .139 - .161Q

.100 - .135

3 PIN TO-220

PACKAGE: 3 PIN TO-220

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PART NUMBER

ACC.

OUTPUT VOLTAGE

PACKAGE

SPX2940U-1.83% 1.8V 3 Lead TO-220SPX2940U-2.53% 2.5V 3 Lead TO-220SPX2940U-3.33% 3.3V 3 Lead TO-220SPX2940U-5.03% 5.0V 3 Lead TO-220SPX2940T-1.83% 1.8V 3 Lead TO-263SPX2940T-1.8/TR 3% 1.8V 3 Lead TO-263SPX2940T-2.53% 2.5V 3 Lead TO-263SPX2940T-2.5/TR 3% 2.5V 3 Lead TO-263SPX2340T-3.33% 3.3V 3 Lead TO-263SPX2340T-3.3/TR

3% 3.3V 3 Lead TO-263SPX2940T-5.03% 5.0V 3 Lead TO-263SPX2940T-5.0/TR 3%

5.0V 3 Lead TO-263

Corporation

ANALOG EXCELLENCE

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.

Sipex Corporation Headquarters and Sales Office

233 South Hillview Drive Milpitas, CA 95035TEL: (408) 934-7500FAX: (408) 935-7600

ORDERING INFORMATION

TO-263-3 Package (T)

V OUT

GND V IN Front View TAB = GND

Front View TAB = GND

TO-220-3 Package (U)

V IN

V OUT GND PACKAGE PINOUTS

Available in lead free packaging. To order add "-L" suffix to part number.Example: SPX2940T-3.3/TR = standard; SPX2940T-3.3-L/TR = lead free /TR = Tape and Reel

Pack quantity is 500 for TO-263.

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