SPX29302T5-L/TR - Sipex Corporation

3A High Current, Lo w Dropout Voltage Regulator

Adjustable, Fast Response Time

SPX29302A

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

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.

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

Figure 1. Adjustable Output Linear Regulator

SPX29302A

OUT

GND ADJ

5R1

6.8µF++

10µF

DESCRIPTION

TYPICAL APPLICATION S CIRCUIT

Refer to page 7 for pinouts.

Now Available in Lead Free Packaging

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

(Note 1) at VIN=VOUT + 1V and IOUT = 10mA, CIN = 6.8µF, COUT = 10µF, Tj = 25°C, unless otherwise specified. The Boldface

applies over the junction temperature range. SPX29302A

PARAMETER CONDITIONS TYP MIN MAX UNITS

Line Regulation IOUT=10mA,(VOUT+1V) ≤ VIN ≤ 16V 0.06 0.5 %

Load Regulation VIN=VOUT+5V, 10mA≤ IOUT ≤ IFL (Note 2) 0.2 1 %

∆V/∆TV

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

Dropout Voltage, except IOUT=100mA 50 175 mV

1.8V, (Note 3) IOUT=1.5A 250

IOUT=3.0A 370 600

Ground Current IOUT=1.5A, VIN=VOUT+1V 10 35 mA

(Note 5) IOUT=3.0A 37

Ground Pin Current VIN=0.5V less than specified VOUT, 1.7 mA

at Dropout IOUT=10mA

Current Limit VOUT=0V (Note 4) 4.0 5.0 A

Output Noise Voltage CL=10µF400 µVRMS

(10Hz to 100kHz)

IL=100mA CL=33µF260

Reference Voltage 1.240 1.228 1.252 VMAX

1.215 1.265

Reference Voltage (Note 8) 1.203 1.277 V

Adjust Pin Bias Current 40 80 nA

120

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

750

VEN=0.8V 1 µA

Regulator Output (Note 10) 10 500 µA

Current in Shutdown

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

TO-220 Junction to Ambient 60

TO-263 Junction to Case, at Tab 2

TO-263 Junction to Ambient 60

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

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: VREF≤ VOUT ≤ (VIN-1), 2.3V≤VIN ≤ 16V, 10mA ≤ IL ≤ IFL, Tj ≤ Tjmax.

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

express these thresholds in terms of output voltage change, multiply the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmable

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

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

Note 10: VEN ≤ 0.8V and VIN ≤ 16V, VOUT = 0.

ELECTRICAL CHARACTERISTICS

Reference

Thermal

Shutdown

IN OUT

ADJ

GND

O.V

LIMIT

28V R1*

R2*

1.180V 1.240V

FLAG

BLOCK DIAGRAM

TYPICAL PERFORMANCE CHARACTERISTICS

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

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

Figure 6. Enable Threshold vs Temperature

200

400

600

800

1000

0 1.0 2.0 3.0

IL (A)

OUT

=3.3V

CL = 10µF

Vdropout (mV)

1200

Vin = 3.2V

85°C

25°C

2.460

2.470

2.480

2.490

2.500

2.510

2.520

2.530

2.540

4681012 14 16

Vin (V)

OUT

=2.5V

IL = 10mA

CL = 10µF

Vout (V)

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

0 1.0 2.0 3.0

IL (A)

VOUT=3.3V

Vin = 4.3V

CL = 10µF

Ignd (mA)

85°C25°C

3.280

3.285

3.290

3.295

3.300

3.305

3.310

0 1.0 2.0 3.0

IL (A)

= 4.3V

CL = 10µF

OUT

=3.3V

Vout (V )

1.2

1.3

-40 -20 0 20 40 60 80 100 120

Temperature (

OUT

=3.3V

Vth (V)

1.4

1.5

1.6

1.7

1.8

1.9

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 applica-

tion. 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 VIN = 10V, VOUT = 5V, IOUT =

1.5A, TA = 50°C, θHA= 1°C/W, θCH= 2°C/W,

and θJC= 3C°/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: PD = (VIN – VOUT) * IOUT = 7.5W.

And the junction temperature is calculated as

TJ = TA + PD * (θHA + θCH + θJC) or

TJ = 50 + 7.5 * (1+2+3) = 95°C

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 alumi-

num 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 capaci-

tor 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(VOUT/1.240-1).

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:

VOUT =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.

APPLICATION INFORMATION

.160 - .190

0 - .010

Dimensions in (mm)

5 PIN TO-263

JEDEC TO-263

(BB) Variation

.020 - .039

.015 - .029

.070 - .110

- -

MIN NOM MAX

e .067 BSC

.066

D1 .270 - -

.380 - .420

.245 -

H.575 - .625

.070

L3 .010 BSC

WITH PLATING

BASE METAL

(b)

CONT ACT AREA

123

5X b

(DATUM A)

c2 .045 - .023

SEATING PLANE

(E)

0º-8º

5 PIN TO-263

PACKAGE: 5 PIN TO-263

.160 - .190

Dimensions in

(inches)

5 PIN TO-220

.015 - .040

MIN NOM MAX

∆P

.014 - .022

.560 - .590

.385 - .415

.062 - .072

.045 - .055

.234 - .258

.090 - .115

.540 - .560

.146 - .156

.103 - .113

- .30 -

- .24 -

- .250

SEATING

PLANE

CHAMFER

OPTIONAL

øP

E/2

CCDD

5 PIN TO-220

PACKAGE: 5 PIN TO-220

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

PACKAGE: PINOUTS

TO-263-5 Package (T5)

Top View

45321

GND

ADJUST

2) INPUT

ENABLE

OUTPUT

SPX29302A

TO-220-5 Package (U5)

Top View

12345

OUTPUT

GND

ADJUST

2) INPUT

ENABLE

SPX29302A

*Tab is internally connected to GND

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 95035

TEL: (408) 934-7500

FAX: (408) 935-7600

/TR = Tape and Reel

Pack quantity is 500 for TO-263.

ORDERING INFORMATION

Available in lead free packaging. To order add “-L” suffix to part number.

Example: SPX29302A/TR = standard; SP6685ER-L/TR = lead free