Datasheet SPX29302A Datasheet (Sipex)

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Page 1

SPX29302A

3A High Current, Low Dr opout Voltage Regulator

Adjustable, Fast Response Time

FEATURES

■ Adjustable Output Down To 1.25V

■ 1% Output Accuracy

■ Output Current of 3A

■ Low Dropout Voltage of 370mV @ 3A

■ Extremely Fast Transient Response

■ Reverse-Battery Protection

■ Zero Current Shutdown (5 pin version)

■ Standard TO-220 and TO-263 Packages

APPLICATIONS

■ Powering VGA & Sound Card

■ PowerPC™ Supplies

■ SMPS Post Regulator

■ High Efficiency “Green” Computer Systems

■ High Efficiency Linear Power Supplies

■ Constant Current Regulators

■ Adjustable Power Supplies

■ Battery Charger

Refer to page 7 for pinouts.

Now Available in Lead Free Packaging

DESCRIPTION

The SPX29302A is a 3A, highly accurate voltage regulator with a low drop out voltage of 370mV (typical) @ 3A. These regulators are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. Fault protection features include over-current, reverse battery, and positive and negative voltage transients. On-Chip trimming adjusts the reference voltage to 1% initial accuracy.

The SPX29302A is offered in 5-pin TO-220 & TO-263 packages.

TYPICAL APPLICATION S CIRCUIT

SPX29302A

6.8µF

Figure 1. Adjustable Output Linear Regulator

1 2

GND

ADJ

10µF

OUT

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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 7) .................................................... 16V

ELECTRICAL CHARACTERISTICS

(Note 1) at VIN=V applies over the junction temperature range.

PARAMETER CONDITIONS TYP MIN MAX UNITS

Line Regulation I Load Regulation VIN=V ∆V/∆TV

Dropout Voltage, except I

1.8V, (Note 3) I

Ground Current I (Note 5) I

Ground Pin Current VIN=0.5V less than specified V at Dropout I

Current Limit V Output Noise Voltage CL=10µF 400 µV

(10Hz to 100kHz) IL=100mA CL=33µF 260

Reference Voltage 1.240 1.228 1.252 V

Reference Voltage (Note 8) 1.203 1.277 V Adjust Pin Bias Current 40 80 nA

Reference Voltage (Note 7) 20 ppm/°C Temp. Coeff.

Adjust Pin Bias 0.1 nA/°C Current Temp. Coeff.

ENABLE Input

∆Input Logic Voltage Low (OFF) VIN<10V 0.8 V High (ON) 2.4

ENABLE Input Pin VEN=16V 100 600 µA

Regulator Output (Note 10) 10 500 µA Current in Shutdown

Thermal Resistance TO-220 Junction to Case, at Tab 2 °C/W

NOTES: Note 1: Maximum positive supply voltage of 20V must be of limited duration (<100msecond) < 1% and duty cycle of less than 1%. The maximum continuous

supply voltage is 16V. Note 2: Full load current (IFL) is defined as 3.0A. Note 3: Dropout voltage is defined as the input to output differential when the output voltage drops to 99% of its nominal value. Note 4: VIN = V Note 5: 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 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range Note 7: Thermal regulation is defined as the change in output voltage at time T after a change in power dissipation is applied, excluding load / line regulation effects.

Specifications for a 200mA load pulse as VIN = 16V (a 4W pulse) for t = 10ms. Note 8: V Note 9: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V input. To

Note 10: V

≤ V

REF

express these thresholds in terms of output voltage change, multiply the error amplifier gain = V

output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 38mV. Threshold remain constant as a percent of

as V

OUT

≤ 0.8V and VIN ≤ 16V, V

+ 1V and I

OUT

= 10mA, CIN = 6.8µF, C

OUT

=10mA,(V

OUT

Temp Coefficient (Note 6) 20 100 ppm/°C

OUT

=100mA 50 175 mV

OUT

=1.5A 250

OUT

=3.0A 370 600

OUT

=1.5A, VIN=V

OUT

=3.0A 37

OUT

=10mA

OUT

=0V (Note 4) 4.0 5.0 A

OUT

+1V) ≤ VIN ≤ 16V 0.06 0.5 %

OUT

+5V, 10mA≤ I

+1V 10 35 mA

OUT

= 10µF, Tj = 25°C, unless otherwise specified. The Boldface

OUT

≤ I

OUT

(Note 2) 0.2 1 %

OUT,

VEN=0.8V 1 µA

TO-220 Junction to Ambient 60 TO-263 Junction to Case, at Tab 2 TO-263 Junction to Ambient 60

OUT (NOMINAL)

OUT

is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.

+1V. For example, use V

≤ (VIN-1), 2.3V≤VIN ≤ 16V, 10mA ≤ IL ≤ IFL, Tj ≤ T

= 0.

OUT

= 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise.

jmax

OUT/VREF

SPX29302A

1.7 mA

1.215 1.265

MAX

120

750

= (R1 + R2)/R2. For example, at a programmable

RMS

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BLOCK DIAGRAM

IN OUT

O.V

FLAG

1.180V

Reference

1.240V ++

Thermal

Shutdown

28V

LIMIT

R1*

R2*

TYPICAL PERFORMANCE CHARACTERISTICS

ADJ

GND

1200

1000

800

600

Vdropout (mV)

400

200

0 1.0 2.0 3.0

85°C

25°C

IL (A)

=3.3V

OUT

CL = 10µF Vin = 3.2V

2.540

2.530

2.520

2.510

2.500

Vout (V)

2.490

2.480

2.470

2.460 4681012 14 16

Figure 2. Dropout Voltage vs Load Current Figure 3. Line Regulation

80.0

70.0

60.0

50.0

40.0

30.0

Ignd (mA)

20.0

10.0

0.0 0 1.0 2.0 3.0

IL (A)

85°C

25°C

=3.3V

OUT

Vin = 4.3V

CL = 10µF

3.310

3.305

3.300

3.295

Vout (V )

3.290

3.285

3.280 0 1.0 2.0 3.0

Figure 4. Ground Current vs Load Current Figure 5. Load Regulation

1.9

1.8

1.7

1.6

1.5

Vth (V)

1.4

1.3

1.2

-40 -20 0 20 40 60 80 100 120

Temperature (

=3.3V

OUT

Vin (V)

IL (A)

=2.5V

OUT

IL = 10mA CL = 10µF

=3.3V

OUT

VIN = 4.3V

CL = 10µF

Figure 6. Enable Threshold vs Temperature

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APPLICATION INFORMATION

The SPX29302A incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage.

Thermal Considerations

Although the SPX29302A 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.

TO-220 Design Example:

Assume that V

= 10V, V

OUT

= 5V, I

OUT

1.5A, TA = 50°C, θHA= 1°C/W, θCH= 2°C/W, and θJC= 3C°/W, where:

TA = ambient temperature,

= heatsink to ambient thermal

resistance

= case to heatsink thermal

resistance

= junction to case thermal

resistance 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 TJ = 50 + 7.5 * (1+2+3) = 95°C

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 SPX29302A is required.

Adjustable Regulator Design

The SPX29302A are adjustable regulators that can be programmed to any value between

1.25V and 16V using 2 resistors, R1 and R2. The relationship between the resistors is:

R1 = R2(V

/1.240-1).

OUT

Enable Input

The SPX29302A has an Enable function that switches the regulator on and off. Its thresholds is TTL compatible. When the regulator is active, approximately 20 uA flows through the Enable pin.

Typical Application Circuits

Figure 1 represents an adjustable output linear regulator. The values of R1 and R2 set the output voltage value as follows:

OUT =VREF

* [1 + (R1/R2)]. For best results, the total series resistance should be small enough to pass a minimum regulator load current of 5 mA. A minimum value of 10kohms is recommended for R2 with a range between 10kohms and 47 kohms.

Reliable operation is insured below 125°C.

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

Page 5

(DATUM A)

PACKAGE: 5 PIN TO-263

SEATING PLANE

5X b

(E)

5 PIN TO-263 JEDEC TO-263 (BB) Variation

A A1 b

c c2 D1 .270 - -

e .067 BSC H

Dimensions in (mm)

MIN NOM MAX

.160 - .190

0 - .010

.020 - .039

.015 - .029

.045 - .023

.380 - .420 .245

.575 - .625

.070 - .110

- .010 BSC

.066

.070

0º-8º

(b)

WITH PLATING

BASE METAL

CONTACT AREA

5 PIN TO-263

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PACKAGE: 5 PIN TO-220

E/2

øP

SEATING PLANE

CHAMFER OPTIONAL

5 PIN TO-220

A b

C1 D E

e e1

F H1

L1 ∆P

Dimensions in (inches)

MIN NOM MAX

.160 - .190

.015 - .040 .014 - .022 .560 - .590 .385 - .415 .385 - .415 .062 - .072

.045 - .055

.234 - .258 .090 - .115 .540 - .560

- .250 .146 - .156

.103 - .113

- .30 -

- .24 -

5 PIN TO-220

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TO-263-5 Package (T5)

PACKAGE: PINOUTS

45321

Top View

TO-220-5 Package (U5)

12345

Top View

SPX29302A

ENABLE INPUT

2) GND

OUTPUT

ADJUST

SPX29302A

ENABLE INPUT

GND

OUTPUT

ADJUST

*Tab is internally connected to GND

ORDERING INFORMATION

PART NUMBER ACCURACY TOP MARK OUTPUT VOLTAGE PACKAGE

SPX29302AT5 1.0% 29302AT5YYWW Adj 5 lead TO-263 SPX29302AT5/TR 1.0% 29302AT5YYWW Adj 5 lead TO-263 SPX29302AU5 1.0% 29302AU5YYWW Adj 5 lead TO-220

Available in lead free packaging. To order add “-L” suffix to part number. Example: SPX29302A/TR = standard; SP6685ER-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.

Datasheet SPX29302A Datasheet (Sipex)

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Frequently Asked Questions

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