Datasheet SPX2940 Datasheet (Sipex)

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®

1A Low Dropout Voltage Regulator

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

APPLICATIONS

■ Powering VGA & Sound Card

■ LCD Monitors

■ USB Power Supply

■ Power PC

■ SMPS Post-Regulator

TM

Supplies

SPX2940

Fixed Output, Fast Response

SPX2940

3 Pin TO-263

123

V

Now Available in Lead Free Packaging

■ PDA or Notebook Computer

■ High Efficiency Linear Power Supplies

■ Portable Instrumentation

■ Constant Current Regulators

■ Cordless Telephones

■ Automotive Electronics

V

GND

IN

OUT

DESCRIPTION

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.

TYPICAL APPLICATIONS CIRCUIT

SPX2940

V

IN

+

6.8µF

Figure 1. Fixed Output Linear Regulator.

1

2

3

+

10µF

V

OUT

1

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

ELECTRICAL CHARACTERISTICS

at VIN=V Boldface applies over the junction temperature range. Adjustable versions are set at 5.0V.

+ 1V and I

OUT

= 10 mA, CIN = 6.8 µF, C

OUT

= 10µF; TA= 25°C, unless otherwise specified. The

OUT

PARAMETER CONDITIONS TYP MIN MAX UNITS

1.8V Version

Output Voltage I

= 10mA 1.8 1.746 1.854 V

OUT

10mA≤I

≤1A, 6V≤VIN≤16V 1.8 1.710 1.890

OUT

2.5V Version

Output Voltage I

= 10mA 2.5 2.425 2.575 V

OUT

10mA≤I

≤1A, 6V≤VIN≤16V 2.5 2.375 2.625

OUT

3.3V Version

Output Voltage I

= 10mA 3.3 3.201 3.399 V

OUT

10mA≤I

≤1A, 6V≤VIN≤16V 3.3 3.135 3.465

OUT

5.0V Version

Output Voltage I

= 10mA 5.0 4.850 5.150 V

OUT

10mA≤I

≤1A, 6V≤VIN≤16V 5.0 4.750 5.250

OUT

All Voltage Options

Line Regulation IO=10mA, (V Load Regulation VIN=V

+1V, 10mA≤I

OUT

∆V Output Voltage 20 100

+1V)≤VIN≤16V 0.2 1.0 %

OUT

≤1A 0.3 1.5 %

OUT

ppm/°C

∆T Temperature Coef. Dropout Voltage (

Note 1)

IO =100mA 70 200 mV (except 1.8V version) IO =1A 280 550 Ground Current (Note 3) IO =750mA, VIN=V

, + 1V 12 25 mA

OUT

IO =1A 18 I

Ground Pin

GNDDO

Current at Dropout I Current Limit V

VIN=0.1V less than specified V

= 10mA

OUT

=0V (Note 2) 2.2 1.5 A

OUT

1.2 mA

Output Noise Voltage CL= 10µF 400 µV 10Hz to 100kHz) IL=100mA CL=33µF 260

Thermal Resistance TO-220 Junction to Case, at Tab 3

TO-220 Junction to Ambient 60 °C/W

TO-263 Junction to Case, at Tab 3

TO-263 Junction to Ambient 60

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: VIN=V 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

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.

OUT (NOMINAL)

effects.

+ 1V. For example, use VIN=4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise.

RMS

2

BLOCK DIAGRAM

IN

O.V I

LIMIT

28V R1

Reference

1.240V +

-

Ibias

Thermal Shutdown

TYPICAL PERFORMANCE CHARACTERISTICS

3.320

3.315

3.310

3.305

(V)

3.300

OUT

3.295

V

3.290

3.285

3.280 46810121416

3.3V Device IL = 10mA CL = 10µF

VIN (V)

Figure 2. Line Regulation Figure 3. Load Regulation

3.310

3.305

3.300

(V)

3.295

OUT

V

3.290

3.285

3.280

0.00 0.25 0.50 0.75 1.00 1.25 1.50

R2

IL (A)

OUT

GND

3.3V Device VIN = 4.3V CL = 10µF

80.0

70.0

60.0

50.0

40.0

30.0

IGnd (mA)

20.0

10.0

0.0

0.00 0.25 0.50 0.75 1.00 1.25 1.50

3.3V Device V CL = 10µF

IL (A)

= 4.3V

IN

300

280

260

240

IGnd (mA)

220

200

180

46 810121416

3.3V Device IL = 10mA CL = 10µF

VIN (V)

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

3

TYPICAL PERFORMANCE CHARACTERISTICS

100

90

80

70

60

50

40

IGnd (mA)

30

20

10

0

0.00 0.25 0.50 0.75 1.00 1.25 1.50

3.3V Device V CL = 10µF

IL (A)

= 3.2V

IN

600

500

400

(mV)

300

DROPOUT

200

V

100

0

0.00 0.25 0.50 0.75 1.00 1.25 1.50

IL (A)

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

280

270

260

250

240

230

220

IGnd (µA)

210

200

190

180

-40 -20 0 20 40 60 80

Temperature (°C)

3.3V Device VIN = 4.3V IL = 10mA CL = 10µF

120100

3.320

3.310

3.300

3.290

3.280

(V)

3.270

OUT

3.260

V

3.250

3.240

3.230

3.220

-40 -20 0 20 40 60 80

Temperature (°C)

3.3V Device CL = 10µF

3.3V Device VIN = 4.3V IL = 10mA CL = 10µF

120100

Figure 8. Ground Current vs Temperature at Figure 9. Output Voltage vs Temperature at I

= 10mA I

LOAD

7.00

6.80

6.60

6.40

6.20

6.00

5.80

IGnd (mA)

5.60

5.40

5.20

5.00

-40 -20 0 20 40 60 80

3.3V Device = 4.3V

V

IN

IL = 500mA CL = 10µF

120100

Temperature (°C)

=10mA

LOAD

30

29

28

27

26

25

24

IGnd (mA)

23

22

21

20

-40 -20 0 20 40 60 80

Temperature (°C)

3.3V Device VIN = 3.2V IL = 750mA CL = 10µF

120100

Figure 10. Ground Current vs Temperature at Figure 11. Ground Current vs Temperature in Dropout I

=500mA at I

LOAD

=750mA

4

TYPICAL PERFORMANCE CHARACTERISTICS

52.0

50.0

48.0

46.0

44.0

42.0

IGnd (mA)

40.0

38.0

36.0

-40 -20 0 20 40 60 80

3.3V Device VIN = 4.3V IL = 1.5A CL = 10µF

Temperature (°C)

Figure 12. Ground Current vs Temperature at I

350

330

310

290

270

(mV)

250

230

210

DROPOUT

190

V

170

150

-40 -20 0 20 40 60 80

3.3V Device IL = 750mA CL = 10µF

Temperature (°C)

Figure 14. Dropout Voltage vs Temperature at I

= 750mA

LOAD

120100

= 1.5A

120100

100

95

90

85

IGnd (mA)

80

3.3V Device VIN = 3.2V

75

IL = 1.5A CL = 10µF

70

-40 -20 0 20 40 60 80

120100

Temperature (°C)

Figure 13. Ground Current vs Temperature in Dropout at I

=1.5A

LOAD

500

480

460

440

(mV)

420

400

380

DROPOUT

360

V

340

320

-40 -20 0 20 40 60 80

3.3V Device IL = 750A CL = 10µF

120100

Temperature (°C)

Figure 15. Dropout Voltage vs Temperature at I

= 1.5mA

LOAD

35

30

25

20

(µA)

15

EN

I

10

5

0

-40 -20 0 20 40 60 80

3.3V Device VIN = 3.2V IL = 750mA CL = 10µF

120100

Temperature (°C)

Figure 16. Enable Current vs Temperature for VEN= 16V

2.00

1.90

1.80

1.70

1.60

1.50

(V)

1.40

TH

1.30

V

1.20

1.10

1.00

-40 -20 0 20 40 60 80

Temperature (°C)

Figure 17. Enable Threshold vs Temperature

3.3V Device V

= 3.2V

IN

IL = 750mA CL = 10µF

120100

5

APPLICATION INFORMATION

The SPX2940 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative 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. Heat will flow through the lowest resistance path, the junction-to-case path. In order to insure the best thermal flow of the component, proper mounting is required. Consult heatsink manufacturer for thermal resistance and design of heatsink.

SPX2940

V

IN

1

+

6.8µF

For example, TO-220 design:

Assume that VIN = 10V, V T

= 50°C/W, θHA= 1°C/W, θCH = 2°C/W, and

A

θJC = 3°C/W.

OUT

= 5V, I

Where TA = ambient temperature

θHA = heatsink to ambient thermal resistance θCH = case to heatsink thermal resistance

= junction to case thermal resistance

θ

JC

The power calculated under these conditions is: PD = (VIN - V

OUT

) * I

= 7.5W.

OUT

And the junction temperature is calculated as TJ = TA + PD * (θHA + θCH + θJC) or T

= 50 + 7.5 * (1 + 2 + 3) = 95°C

J

Reliable operation is insured.

3

2

+

10µF

V

OUT

= 1.5A,

Figure 18. Fixed Output Linear Regulator.

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 SPX2940 is required.

6

PACKAGE: 3 PIN TO-263

E

123

e

b2

E/2

SEATING PLANE

A

L1

D

C2

H

B

c

See View C

b

GAUGE PLANE

SEATING PLANE

0º-8º

A1

b

3-PIN TO-263 JEDEC TO-263 (AA) Variation

A

A1

b

c

D

D1 .270 - -

E

E1

e .100 BSC

H

L

L1

L2

L3

Dimensions in inches

MIN NOM MAX

.160 - .190

.000 - .010

.020 - .039

.015 - .029

.330 - .380

.380 - .420

.245

.575 - .625

.070 - .110

- -

-

.010 BSC

-

.066

.070

L

View C

WITH PLATING

c

BASE METAL

SECTION B-B

3 PIN TO-263

7

PACKAGE: 3 PIN TO-220

B

A1

A

SEATING PLANE

CHAMFER OPTIONAL

A

E

E2

Q

D

E/2

A

øP

H1

D1

L1

1

D

C

e

D

L

b

e1

C

A2

3 PIN TO-220

Dimensions in (mm)

A

A1

A2

b

b2

c

D

D1

D2

E

E1

E2

e

e1

H1

L1

L2

∆P

Q

JEDEC TO-220 (AB) Variation

MIN NOM MAX

.140 - .190

.020 - .055

.080 - .115

.015 .027 .040

.045 - .070

.014 - .024

.560 - .650

.330 - .355

.480 - .507

.380 - .420

.270

-

- - .030

.100 BSC

.200 BSC

.230 - .270

- - .250

- - -

.139 - .161

.100 -

.135

.350

b

WITH PLATING

c

BASE METAL

CONTACT AREA

3 PIN TO-220

8

PACKAGE PINOUTS

TO-263-3 Package (T)

123

V

GNDV

IN

OUT

Front View TAB = GND

TO-220-3 Package (U)

321

V

IN

GND

V

OUT

Front View TAB = GND

ORDERING INFORMATION

PART NUMBER ACC. OUTPUT VOLTAGE PACKAGE

SPX2940U-1.8 3% 1.8V 3 Lead TO-220

SPX2940U-2.5 3% 2.5V 3 Lead TO-220

SPX2940U-3.3 3% 3.3V 3 Lead TO-220

SPX2940U-5.0 3% 5.0V 3 Lead TO-220

SPX2940T-1.8 3% 1.8V 3 Lead TO-263

SPX2940T-1.8/TR 3% 1.8V 3 Lead TO-263

SPX2940T-2.5 3% 2.5V 3 Lead TO-263

SPX2940T-2.5/TR 3% 2.5V 3 Lead TO-263

SPX2340T-3.3 3% 3.3V 3 Lead TO-263

SPX2340T-3.3/TR 3% 3.3V 3 Lead TO-263

SPX2940T-5.0 3% 5.0V 3 Lead TO-263

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

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.

Corporation

ANALOG EXCELLENCE

Sipex Corporation

Headquarters and Sales Office

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

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.

9

Datasheet SPX2940 Datasheet (Sipex)

Specifications and Main Features

Frequently Asked Questions

User Manual