SPX1587AT-L-3.3_技术文档

®

SPX1587

3A Low Dropout Voltage Regulator

FEATURES

■ Guaranteed 3A Output Current

SPX1587

3 Pin TO-263

■ Three Terminal Adjustable or Fixed

SPX1587

1.5V, 1.8V, 2.5V, 3.3V and 5.0V

1

2

3

3 Pin TO-220

■ Low Quiescent Current

1

2

3

■ Low Dropout Voltage: 1.1V at 3A

■ Line Regulation: 0.1%

■ Load Regulation: 0.1%

ADJ/GND

V_OUTV_IN

■ Stable with 10uF Ceramic Capacitor

■ Overcurrent and Thermal Protection

■ Available Packages: TO-252,

TO-220, and TO-263

ADJ/GND

V_OUTV_IN

Now Available in Lead Free Packaging

■ Similar to Industry Standard LT1085/

APPLICATIONS

LT1585

■ Desktop PC's Servers

■ Powering VGA and Sound Cards

■ Cordless Phones

■ Battery Chargers

■ Adjustable Power Supplies

■ Portable Instrumentation

■ SMPS Post-Regulator

DESCRIPTION

The SPX1587 is a low power positive-voltage regulator designed to satisfy moderate power requirements

with a cost effective, small footprint solution. This device is an excellent choice for use in battery-powered

applicationsandportablecomputers. TheSPX1587featuresverylowquiescentcurrentandalowdropout

voltage of 1.1V at a full load. As output current decreases, quiescent current flows into the load, increasing

efficiency. SPX1587 is available in adjustable or fixed 1.5V, 1.8V, 2.5V, 3.3V and 5.0V output voltages.

TheSPX1587isofferedinseveral3-pinsurfacemountpackages:TO-252, TO-220andTO-263. Anoutput

capacitor of 10µF ceramic or tantalum provides unconditional stability.

FUNCTIONAL DIAGRAM (Adjustable)

V_IN

+

Current Limit

-

V_OUT

I_CL

_

AMP

+

1.25V

V_REF

+

–

Thermal Limit

ADJ/GND

–

~

I_ADJ50µA

I _TL

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

1

ABSOLUTE MAXIMUM RATINGS

Operating Junction Temperature Range.....-40°C to +125°C

Input Supply Voltage .................................................... +10V

Input to Output Voltage ................................................ +8.8V

ESD Rating .............................................................. 2kV min

Power Dissipation.......................................Internally Limited

Lead Temperature (soldering, 5 seconds) ................ 260°C

Storage Temperature Range.......................-65°C to +150°C

ELECTRICAL CHARACTERISTICS

Specifications are at V_IN=V_OUT+ 1.5V, T_A= 25°C, C_IN= C_OUT= 10µF, I_OUT=10mA, unless otherwise specified. The ♦ denotes

the specifications which apply full operating temperature range -40°C to +85°C, unless otherwise specified.

PARAMETER

MIN

TYP

MAX

MIN

TYP

MAX UNITS

CONDITIONS

1.5V Version

SPX1587A

SPX1587

Output Voltage

1.485

1.470

1.500

1.515

1.530

1.470

1.455

1.500

1.530

1.545

V

I_OUT= 10mA, V_IN=3.5V

10mA ≤ I_OUT≤ 3A, 3.0V ≤ V_IN≤ 10V

♦

1.8V Version

Output Voltage

1.782

1.764

1.800

2.500

3.300

5.000

1.818

1.836

1.764

1.746

1.800

2.500

3.300

5.000

1.836

1.854

I_OUT= 10mA, V_IN=3.8V

10mA ≤ I_OUT≤ 3A, 3.3V ≤ V_IN≤ 10V

2.5V Version

Output Voltage

2.475

2.450

2.525

2.550

2.450

2.425

2.550

2.575

I_OUT= 10mA, V_IN=4.5V

10mA ≤ I_OUT≤ 3A, 4.25V ≤ V_IN≤ 10V

3.3V Version

Output Voltage

3.267

3.234

3.333

3.366

3.234

3.201

3.366

3.399

I_OUT= 10mA, V_IN=5V

10mA ≤ I_OUT≤ 3A, 4.75V ≤ V_IN≤ 10V

5.0V Version

Output Voltage

4.950

4.900

5.050

5.100

4.900

4.850

5.100

5.150

I_OUT=10mA, V_IN=7V

10mA ≤ I_OUT≤ 3A, 6.50V ≤ V_IN≤ 10V

All Voltage Options

Reference Voltage

1.238

1.225

1.250

0.3

1.262

1.275

1.225

1.212

1.250

0.5

1.275

1.287

I_OUT=10mA, (V_IN- V_OUT)= 2V

10mA≤I_OUT≤ 3A, 1.5V≤(V_IN-V_OUT)≤ 10V

Output Voltage

Temperature Stability

%

Line Regulation

0.1

0.2

0.1

0.2

3.0V≤V_IN≤ 10V,V_OUT=1.5V

3.3V≤V_IN≤ 10V,V_OUT=1.8V

4.25V≤V_IN≤ 10V,V_OUT=2.5V

4.75V≤V_IN≤ 10V,V_OUT=3.3V

6.50V≤V_IN≤ 10V,V_OUT=5.0V

Load Regulation

0.1

0.3

0.1

0.3

%

10mA≤I_OUT≤ 3A, V_OUT=1.5V

10mA≤I_OUT≤ 3A, V_OUT=1.8V

10mA≤I_OUT≤ 3A, V_OUT=2.5V

10mA≤I_OUT≤ 3A, V_OUT=3.3V

10mA≤I_OUT≤ 3A, V_OUT=5.0V

Dropout Voltage

(Note 2)

1.00

1.05

1.10

1.00

1.05

1.10

V

I_OUT=1A

I_OUT=2A

I_OUT=3A

1.2

10

1.2

10

Minimum Load Current

(Note 4)

4

mA

Quiescent Current

Adjust Pin Current

4

10

4

10

mA

Fixed voltage versions

50

µA

120

♦

Current Limit

3.2

60

5

3.2

60

5

A

(V_IN-V_OUT)=2V

Thermal Regulation

Ripple Rejection

0.01

75

0.1

0.01

75

0.1

%/W

dB

25°C, 30mS pulse

F_RIPPLE=120Hz, (V_IN-V_OUT)=2V,

V_RIPPLE=1V_PP

Long Term Stability

RMS Output Noise

Thermal Resistance

0.03

%

125°C, 1000Hrs

0.003

% of V_OUT, 10Hz≤f≤10kHz

3

60

3

60

6

3

60

3

60

6

°C/W

TO-220 Junction to Case, at Tab

TO-220 Junction to Ambient

TO-263 Junction to Case, at Tab

TO-263 Junction to Ambient

TO-252 Junction to Case, at Tab

TO-252 Junction to Ambient

126

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

2

ELECTRICAL CHARACTERISTICS: Continued (Notes)

NOTES:

Note 1: Output temperature coefficient is defined as the worst case voltage change divided by the total temperature range

Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value

measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V

over temperature) must be taken into account.

Note 3: ThermalregulationisdefinedasthechangeinoutputvoltageatatimeTafterachangeinpower dissipationisapplied.excluding

load or line regulation effect.

Note 4: Adjustable Version Only.

TYPICAL PERFORMANCE CHARACTERISTICS

3.325

3.320

3.315

1.275

1.27

1.25v Adj

1.265

1.26

1.255

1.25

3.310

3.305

1.245

1.24

1.235

1.23

3.300

1.225

4.5

6.5

8.5

10.5

12.5

14.5

-50

-30

-10

10

30

50

70

90

110

130

Temp (C)

Vin (V)

Figure 1. Line Regulation for SPX1587U-3.3; I_OUT=10mA

Figure 2. V_OUTvs Temperature, V_IN=2.5V, I_OUT=10mA

3.38

2.55

3.3v Adj

3.3v Fixed

2.5v Adj

2.5v Fixed

2.54

2.53

3.36

2.52

2.51

3.34

3.32

3.3

2.5

2.49

2.48

2.47

3.28

2.46

2.45

3.26

-50 -30 -10 10 30 50 70

90 110 130

-50 -30 -10 10 30 50 70

90 110 130

Temp (°C)

Temp (C)

Figure 4. V_IN=5.0V, I_OUT=10mA

Figure 3. V_IN=4.0V, I_OUT=10mA

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

3

APPLICATION INFORMATION

Output Capacitor

However the value of the ADJ-bypass capacitor

should be chosen with respect to the following

equation:

To ensure the stability of the SPX1587, an output

capacitor of at least 10µF (ceramic or tantalum) or

22µF (aluminum) is required. The value may change

based on the application requirements of the output

loadortemperaturerange. ThevalueofESRcanvary

based on the type of capacitor used in the applica-

tions to guarantee stability. The recommended value

for ESR is 0.5Ω or less. A larger value of output

capacitance (up to 100µF) can improve the load

transient response.

C = 1 / ( 6.28 * F_R* R₁)

Where

C = value of the capacitor in Farads

(select an equal or larger standard value),

F_R= ripple frequency in Hz,

R₁= value of resistor R1 in Ohms.

If an ADJ-bypass capacitor is used, the amplitude

of the output ripple will be independent of the

output voltage. If an ADJ-bypass capacitor is not

used, the output ripple will be proportional to the

ratio of the output voltage to the reference voltage:

M = V_OUT/ V_REF

Soldering Methods

The SPX1587 die is attached to the heatsink lead

which exits opposite the input, output, and ground

pins.

Where M = multiplier for the ripple seen when the

ADJ pin is optimally bypassed.

Thermal Characteristics

The SPX1587 features the internal thermal limiting

to protect the device during overload conditions.

Specialcareneedstobetakenduringcontinuousload

conditions such that the maximum junction tempera-

ture does not exceed 125°C. Thermal protection is

activated at >179°C and deactiviated at <165 °C.

V_REF=1.25V

Ripple rejection for the adjustable version is

shown in Figure 5.

Output Voltage

The thermal interaction from other components in

the application can effect the thermal resistance of

the SPX1587. The actual thermal resistance can be

determined with experimentation.

The output of the adjustable regulator can be set to

any voltage between 1.25V and 15V. The value of

V_OUTcan be quickly approximated using the

formula

SPX1587 power dissipation is calculated as follows:

V_OUT=1.25 *(R₁+ R₂)/R₁

P_D= (V_IN- V_OUT)(I_OUT

)

A small correction to this formula is required

depending on the values of resistors R₁and R₂,

since the adjustable pin current (approx 50µA)

flows through R₂. When I_ADJis taken into account,

the formula becomes

Maximum Junction Temperature range:

T_J= T_A(max) + P_D* thermal resistance

(junction-to-ambient)

Maximum junction temperature must not exceed the

V_OUT= V_REF(1+ (R₂/R₁)) + I_ADJ* R₂

125°C.

where

Ripple Rejection

V_REF=1.25V

Ripple rejection can be improved by adding a

capacitor between the ADJ pin and ground as

shown in Figure 8. When ADJ pin bypassing is

used, the value of the output capacitor required

increases to its maximum. If the ADJ pin is not

bypassed, the value of the output capacitor can be

lowered to 22µF for an electrolytic aluminum

capacitor or 10µF for a solid tantalum capacitor

(Fig 7).

Layout Considerations

Parasitic line resistance can degrade load

regulation. In order to avoid this, connect R₁

directly to V_OUTas illustrated in Figure 13. For the

same reason, R₂should be connected to the

negative side of the load.

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

4

APPLICATION INFORMATION: Continued

0

-10

-20

-30

-40

-50

-60

-70

-80

V _IN

SPX1587

V_OUT

IN

OUT

+

4.7µF

C₁

C ₂

ADJ

R₁

I_OUT

V_REF

R₁

LOAD

I_OUT

=

-90

10

100

1000

10000

100000 1000000

Frequency, Hz

Figure 6. Current Source

Figure 5. Ripple Rejection; Vin=3.3V, Vout=1.8V (adj.),

Iload=200mA

SPX1587

(Note A)

V _IN

5V

IN

OUT

V_OUT

+

V_IN

V_OUT

SPX1587

4.7µF

OUT

ADJ

IN

R₁

+

C₂

C₁

330Ω

1%

4.7µF

V_REF

R₁

R₂

ADJ

I_ADJ

50µA

10µF

R₂

1kΩ,

+

C₁

10µF*

*C ₁improves ripple rejection.

V_OUT= V

) +I

_ADJR ₂

_REF(1+R ₂/R₁

1%

Z

_Cshould be ~ R1 at ripple frequency

_OUT) + (V ^{DROPOUT (MAX)}

= (Intended V

)

Note A:

V

IN(MIN)

Figure 7. Typical Adjustable Regulator

Figure 8. Improving Ripple Rejection

R

_PParasitic Line

Resistance

SPX1587

V_IN

OUT

5V

IN

V_IN

V_OUT

SPX1587

(Note A)

330W

1%

ADJ

+

ADJ

+

4.7µF

10µF

to

Connect R

1K

R ₁

TTL

Case of Regulator

2N3904

Input

1kΩ

1%

Connect R₂

to Load

1k

R _L

R ₂

Note A:

V

_IN(MIN)= (Intended V_OUT) + (V

)

DROPOUT (MAX)

Figure 9. 5V Regulator with Shutdown

Figure 10. Recommended Connections for Best Results

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

5

PINOUTS

TO-220-3 (U)

TO-263-3 (T)

TO-252 (R)

1

2

3

2

3

1

2

3

ADJ/GND

V

V_IN

OUT

ADJ/GND

V_OUT

V_IN

Front View

Top View

ADJ/GND

V_OUT

V_IN

Front View

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

6

PACKAGE: 3 PIN TO-252

GAUGE PLANE

c

C

SEATING PLANE

c

L

A1

L2

O

(L1)

b

E1

WITH PLATING

c

E1/2

D1

BASE METAL

CONTACT AREA

3 PIN TO-252

JEDEC TO-252

(AA) Variation

Dimensions in inches

MIN NOM MAX

-

.005

.024

A1

c

.018

-

.205

.170

-

D1

E1

H

-

.370

-

.410

.070

.055 .060

.108 REF

.020 BSC

L

L1

3 PIN TO-252

L2

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

7

PACKAGE: 3 PIN TO-220

φ P

E

α (5X)

Q

D

H1

V

E-PIN

R

b1

L

e3

C1

J1

DIMENSIONS

in inches

e

e1

SYMBOL

MIN

0.160

MAX

0.190

A

b

0.025

0.040

C1

D

0.015

0.022

0.560

0.590

E

0.385

0.415

e

0.090

0.110

C

L

e1

e3

F

0.190

0.210

0.045

0.055

0.045

0.055

H1

J1

φ P

Q

0.234

0.258

F

0.090

0.115

A

0.146

0.156

0.103

0.113

L

0.540

0.560

α

3° typ

7° typ

b1

0.450

0.060

R

U

V

0.243 REF

0.300 REF

0.240 REF

6.170 REF

7.620 REF

6.100 REF

3 Pin TO-220

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

8

PACKAGE: 3 PIN TO-263

E

A

K

B

S

H

M

L

W

P

-A-

N

G

D

R

TERMINAL 8

C

U

V

DIMENSIONS

in inches

SYMBOL

MIN

.396

MAX

0.406

0.336

0.180

0.036

0.055

0.100 REF

0.620

0.066

.010

A

B

C

D

E

G

H

K

L

0.326

0.170

0.026

0.045

0.100 REF

0.580

0.055

.000

M

N

P

R

S

U

V

W

0.098

.017

0.108

.023

.090

.110

0°

8°

.095

.105

.30 REF

.305 REF

.010

.30 REF

.305 REF

.010

3 Pin TO-263

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

9

ORDERING INFORMATION

PART NUMBER

ACC.

OUTPUT VOLTAGE

PACKAGE

SPX1587AR ................... 1% ................................. Adj......................................... 3 lead TO-252

SPX1587AR/TR ............. 1% ................................. Adj......................................... 3 lead TO-252

SPX1587AR-1.5 ............. 1% ................................ 1.5V ....................................... 3 lead TO-252

SPX1587AR-1.5/TR ....... 1% ................................ 1.5V ....................................... 3 lead TO-252

SPX1587AR-1.8 ............. 1% ................................ 1.8V ....................................... 3 lead TO-252

SPX1587AR-1.8/TR ....... 1% ................................ 1.8V ....................................... 3 lead TO-252

SPX1587AR-2.5 ............. 1% ................................ 2.5V ....................................... 3 lead TO-252

SPX1587AR-2.5/TR ....... 1% ................................ 2.5V ....................................... 3 lead TO-252

SPX1587AR-3.3 ............. 1% ................................ 3.3V ....................................... 3 lead TO-252

SPX1587AR-3.3/TR ....... 1% ................................ 3.3V ....................................... 3 lead TO-252

SPX1587AR-5.0 ............. 1% ................................ 5.0V ....................................... 3 lead TO-252

SPX1587AR-5.0/TR ....... 1% ................................ 5.0V ....................................... 3 lead TO-252

SPX1587AT.................... 1% ................................. Adj......................................... 3 lead TO-263

SPX1587AT/TR .............. 1% ................................. Adj......................................... 3 lead TO-263

SPX1587AT-1.5 ............. 1% ................................ 1.5V ....................................... 3 lead TO-263

SPX1587AT-1.5/TR........ 1% ................................ 1.5V ....................................... 3 lead TO-263

SPX1587AT-1.8 ............. 1% ................................ 1.8V ....................................... 3 lead TO-263

SPX1587AT-1.8/TR........ 1% ................................ 1.8V ....................................... 3 lead TO-263

SPX1587AT-2.5 ............. 1% ................................ 2.5V ....................................... 3 lead TO-263

SPX1587AT-2.5/TR........ 1% ................................ 2.5V ....................................... 3 lead TO-263

SPX1587AT-3.3 ............. 1% ................................ 3.3V ....................................... 3 lead TO-263

SPX1587AT-3.3/TR........ 1% ................................ 3.3V ....................................... 3 lead TO-263

SPX1587AT-5.0 ............. 1% ................................ 5.0V ....................................... 3 lead TO-263

SPX1587AT-5.0/TR........ 1% ................................ 5.0V ....................................... 3 lead TO-263

SPX1587AU ................... 1% ................................. Adj......................................... 3 lead TO-220

SPX1587AU-1.5 ............. 1% ................................ 1.5V ....................................... 3 lead TO-220

SPX1587AU-1.8 ............. 1% ................................ 1.8V ....................................... 3 lead TO-220

SPX1587AU-2.5 ............. 1% ................................ 2.5V ....................................... 3 lead TO-220

SPX1587AU-3.3 ............. 1% ................................ 3.3V ....................................... 3 lead TO-220

SPX1587AU-5.0 ............. 1% ................................ 5.0V ....................................... 3 lead TO-220

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

Example: SPX1587AT-5.0/TR = standard; SPX1587AT-L-5.0/TR = lead free

/TR = Tape and Reel

Pack quantity is 500 for TO-263 and 2,000 for TO-252.

Corporation

ANALOGEXCELLENCE

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

SPX1587 3A Low Dropout Voltage Regulator

10

ORDERING INFORMATION

PART NUMBER

ACC.

OUTPUT VOLTAGE

PACKAGE

SPX1587R...................... 2% ................................. Adj......................................... 3 lead TO-252

SPX1587R/TR ................ 2% ................................. Adj......................................... 3 lead TO-252

SPX1587R-1.5 ............... 2% ................................ 1.5V ....................................... 3 lead TO-252

SPX1587R-1.5/TR.......... 2% ................................ 1.5V ....................................... 3 lead TO-252

SPX1587R-1.8 ............... 2% ................................ 1.8V ....................................... 3 lead TO-252

SPX1587R-1.8/TR.......... 2% ................................ 1.8V ....................................... 3 lead TO-252

SPX1587R-2.5 ............... 2% ................................ 2.5V ....................................... 3 lead TO-252

SPX1587R-2.5/TR.......... 2% ................................ 2.5V ....................................... 3 lead TO-252

SPX1587R-3.3 ............... 2% ................................ 3.3V ....................................... 3 lead TO-252

SPX1587R-3.3/TR.......... 2% ................................ 3.3V ....................................... 3 lead TO-252

SPX1587R-5.0 ............... 2% ................................ 5.0V ....................................... 3 lead TO-252

SPX1587R-5.0/TR.......... 2% ................................ 5.0V ....................................... 3 lead TO-252

SPX1587T ...................... 2% ................................. Adj......................................... 3 lead TO-263

SPX1587T/TR ................ 2% ................................. Adj......................................... 3 lead TO-263

SPX1587T-1.5 ................ 2% ................................ 1.5V ....................................... 3 lead TO-263

SPX1587T-1.5/TR .......... 2% ................................ 1.5V ....................................... 3 lead TO-263

SPX1587T-1.8 ................ 2% ................................ 1.8V ....................................... 3 lead TO-263

SPX1587T-1.8/TR .......... 2% ................................ 1.8V ....................................... 3 lead TO-263

SPX1587T-2.5 ................ 2% ................................ 2.5V ....................................... 3 lead TO-263

SPX1587T-2.5/TR .......... 2% ................................ 2.5V ....................................... 3 lead TO-263

SPX1587T-3.3 ................ 2% ................................ 3.3V ....................................... 3 lead TO-263

SPX1587T-3.3/TR .......... 2% ................................ 3.3V ....................................... 3 lead TO-263

SPX1587T-5.0 ................ 2% ................................ 5.0V ....................................... 3 lead TO-263

SPX1587T-5.0/TR .......... 2% ................................ 5.0V ....................................... 3 lead TO-263

SPX1587U...................... 2% ................................. Adj......................................... 3 lead TO-220

SPX1587U-1.5 ............... 2% ................................ 1.5V ....................................... 3 lead TO-220

SPX1587U-1.8 ............... 2% ................................ 1.8V ....................................... 3 lead TO-220

SPX1587U-2.5 ............... 2% ................................ 2.5V ....................................... 3 lead TO-220

SPX1587U-3.3 ............... 2% ................................ 3.3V ....................................... 3 lead TO-220

SPX1587U-5.0 ............... 2% ................................ 5.0V ....................................... 3 lead TO-220

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

Example: SPX1587AT-5.0/TR = standard; SPX1587AT-L-5.0/TR = lead free

/TR = Tape and Reel

Pack quantity is 500 for TO-263 and 2,000 for TO-252.

Corporation

ANALOG EXCELLENCE

Sipex Corporation

Headquarters and

Sales Office

233 South Hillview Drive

Milpitas, CA 95035

TEL: (408) 934-7500

FAX: (408) 935-7600

Date: 5/25/04

SPX1587 3A Low Dropout Voltage Regulator

11


型号：	SPX1587AT-L-3.3
厂家：	SIPEX CORPORATION
描述：	Fixed Positive LDO Regulator, 3.3V, 1.2V Dropout, PSSO3, TO-263, 3 PIN 输出元件调节器
文件：	总11页 (文件大小：168K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SPX1587AT-L-3.3 [SIPEX]

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