SPX29302AT5 [SIPEX]

3A High Current, Low Dropout Voltage Regulator Adjustable, Fast Response Time; 3A大电流，低压差稳压器可调节，响应时间快


型号：	SPX29302AT5
厂家：	SIPEX CORPORATION
描述：	3A High Current, Low Dropout Voltage Regulator Adjustable, Fast Response Time 3A大电流，低压差稳压器可调节，响应时间快线性稳压器IC 调节器电源电路输出元件
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SPX29302A

3A High Current, Low Dropout Voltage Regulator

Adjustable, Fast Response Time

FEATURES

APPLICATIONS

■ Adjustable Output Down To 1.25V

■ 1% Output Accuracy

■ Powering VGA & Sound Card

■ PowerPC™ Supplies

■ Output Current of 3A

■ SMPS Post Regulator

■ High Efficiency “Green” Computer

Systems

■ High Efficiency Linear Power Supplies

■ Constant Current Regulators

■ Adjustable Power Supplies

■ Battery Charger

■ 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

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.Theseregulatorsarespecificallydesignedforlowvoltageapplications

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

OUT

10µF

6.8µF

ADJ

GND

Figure 1. Adjustable Output Linear Regulator

Date: 5/25/04

SPX29302A 3Amp LDO Low Dropout Voltage Regulator

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 V_IN=V_OUT+ 1V and I_OUT= 10mA, C_IN= 6.8µF, C_OUT= 10µF, T_j= 25°C, unless otherwise specified. The Boldface

applies over the junction temperature range.

SPX29302A

PARAMETER

CONDITIONS

TYP

MIN

MAX

UNITS

Line Regulation

Load Regulation

∆V/∆T

I_OUT=10mA,(V_OUT+1V) ≤ V_IN≤ 16V

V_IN=V_OUT+5V, 10mA≤ I_OUT≤ I_FL(Note 2)

V_OUTTemp Coefficient (Note 6)

0.06

0.2

0.5

100

175

ppm/°C

Dropout Voltage, except I_OUT=100mA

1.8V, (Note 3)

250

370

I_OUT=1.5A

_OUT=3.0A

600

Ground Current

(Note 5)

I_OUT=1.5A, V_IN=V_OUT+1V

I_OUT=3.0A

Ground Pin Current

at Dropout

V_IN=0.5V less than specified V_OUT,

I_OUT=10mA

1.7

Current Limit

V_OUT=0V (Note 4)

4.0

5.0

Output Noise Voltage

(10Hz to 100kHz)

I_L=100mA

C_L=10µF

400

µV_RMS

C_L=33µF

(Note 8)

(Note 7)

260

Reference Voltage

1.240

1.228

1.252

V_MAX

1.215

1.265

Reference Voltage

1.203

1.277

Adjust Pin Bias Current

120

Reference Voltage

Temp. Coeff.

ppm/°C

nA/°C

Adjust Pin Bias

Current Temp. Coeff.

0.1

ENABLE Input

∆Input Logic Voltage

Low (OFF)

V_IN<10V

V_EN=16V

0.8

High (ON)

2.4

ENABLE Input Pin

100

600

750

µA

_EN=0.8V

Regulator Output

Current in Shutdown

(Note 10)

500

µA

Thermal Resistance

TO-220 Junction to Case, at Tab

TO-220 Junction to Ambient

TO-263 Junction to Case, at Tab

TO-263 Junction to Ambient

°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 (I ) 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: V = V

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

OUT (NOMINAL)

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 V = 16V (a 4W pulse) for t = 10ms.

Note 8: V

≤ V

OUT

≤ (V -1), 2.3V≤V ≤ 16V, 10mA ≤ I ≤ I , T ≤ T

REF

jmax

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

OUT REF

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

OUT

Note 10: V ≤ 0.8V and V ≤ 16V, V = 0.

OUT

Date: 5/25/04

SPX29302A 3Amp LDO Low Dropout Voltage Regulator

BLOCK DIAGRAM

OUT

O.V

I_LIMIT

1.180V

FLAG

1.240V

28V

R1*

Reference

ADJ

Thermal

Shutdown

R2*

GND

TYPICAL PERFORMANCE CHARACTERISTICS

1200

1000

800

2.540

2.530

2.520

2.510

600

400

2.500

2.490

85°C

25°C

2.480

2.470

V_OUT=2.5V

IL = 10mA

CL = 10µF

V_OUT=3.3V

CL = 10µF

Vin = 3.2V

200

2.460

1.0

2.0

3.0

IL (A)

Vin (V)

Figure 2. Dropout Voltage vs Load Current

Figure 3. Line Regulation

80.0

70.0

3.310

3.305

3.300

3.295

3.290

60.0

25°C

50.0

40.0

30.0

85°C

_OUT=3.3V

20.0

10.0

V_OUT=3.3V

Vin = 4.3V

CL = 10µF

V_IN= 4.3V

CL = 10µF

3.285

3.280

0.0

1.0

2.0

3.0

1.0

2.0

3.0

IL (A)

Figure 4. Ground Current vs Load Current

Figure 5. Load Regulation

1.9

1.8

1.7

1.6

V_OUT=3.3V

1.5

1.4

1.3

1.2

-40

-20

100

120

Temperature (^oC)

Figure 6. Enable Threshold vs Temperature

Date: 5/25/04

SPX29302A 3Amp LDO Low Dropout Voltage Regulator

APPLICATION INFORMATION

The SPX29302A incorporates protection

against over-current faults, reversed load

insertion, over temperature operation, and

positive and negative transient voltage.

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

Thermal Considerations

To ensure a proper behavior of the regulator

under light load, a minimum load of 5mA for

SPX29302A is required.

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.

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_OUT/1.240-1).

TO-220 Design Example:

Assume that V_IN= 10V, V_OUT= 5V, I_OUT

Enable Input

1.5A, T_A= 50°C, θ_HA= 1°C/W, θ_CH= 2°C/W,

and θ_JC= 3C°/W, where:

T_A= ambient temperature,

θ_HA= heatsink to ambient thermal

resistance

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.

θ_CH= case to heatsink thermal

resistance

θ_JC= junction to case thermal

resistance

Typical Application Circuits

Figure 1 represents an adjustable output linear

regulator. The values of R1 and R2 set the

output voltage value as follows:

The power calculated under these conditions

is:

V_OUT=V_REF* [1 + (R1/R2)].

P_D= (V_IN– V_OUT) * I_OUT= 7.5W.

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.

And the junction temperature is calculated as

T_J= T_A+ P_D* (θ_HA+ θ_CH+ θ_JC) or

T_J= 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

Date: 5/25/04

SPX29302A 3Amp LDO Low Dropout Voltage Regulator

PACKAGE: 5 PIN TO-263

SEATING PLANE

(DATUM A)

(E)

5X b

5 PIN TO-263

JEDEC TO-263

(BB) Variation

Dimensions in (mm)

MIN NOM MAX

.160

.190

.010

.039

.029

.023

.020

.015

.045

.270

0º-8º

.380

.245

.420

(b)

.067 BSC

.625

WITH PLATING

.575

.070

.110

.066

.070

.010 BSC

BASE METAL

CONTACT AREA

5 PIN TO-263

Date: 5/25/04

SPX29302A 3Amp LDO Low Dropout Voltage Regulator

PACKAGE: 5 PIN TO-220

E/2

SEATING

PLANE

øP

CHAMFER

OPTIONAL

Dimensions in

(inches)

5 PIN TO-220

MIN NOM MAX

.160

.190

.040

.022

.590

.415

.015

.014

.560

.385

.062

.415

.072

.045

.234

.090

.540

.055

.258

.115

.560

.250

∆P

.146

.156

.103

.113

5 PIN TO-220

.30

.24

Date: 5/25/04

SPX29302A 3Amp LDO Low Dropout Voltage Regulator

PACKAGE: PINOUTS

TO-263-5 Package (T5)

SPX29302A

1) ENABLE

2) INPUT

3 4 5

3) GND

4) OUTPUT

ADJUST

Top View

TO-220-5 Package (U5)

SPX29302A

ENABLE

2) INPUT

GND

OUTPUT

ADJUST

1 2 3 4 5

Top View

*Tab is internally connected to GND

ORDERING INFORMATION

PART NUMBER

SPX29302AT5

SPX29302AT5/TR

SPX29302AU5

ACCURACY

TOP MARK

OUTPUT VOLTAGE

PACKAGE

1.0%

29302AT5YYWW

29302AU5YYWW

Adj

5 lead TO-263

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.

Date: 5/25/04

SPX29302A 3Amp LDO Low Dropout Voltage Regulator

SPX29302AT5 [SIPEX]

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