SPX1582_06 [SIPEX]

3A Ultra Low Dropout Voltage Regulator; 3A超低压差稳压器


型号：	SPX1582_06
厂家：	SIPEX CORPORATION
描述：	3A Ultra Low Dropout Voltage Regulator 3A超低压差稳压器稳压器
文件：	总7页 (文件大小：205K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SPX1582

3A Ultra Low Dropout Voltage Regulator

Fast Response, Adjustable & Fixed

FEATURES

■Low Dropout Voltage 500mV at 3A Full Load Current

■Adjustable Ouput Down to 1.25V from ATX Power Supply

■Fixed Output Voltages of 3.3V and 2.5V

SPX1582

5 Pin TO-263

SPX1582

2 3 4 5

5 Pin TO-220

■Extremely Tight Load and Line Regulation

■Standard 5-Terminal Low Cost TO-220 and TO-263

APPLICATIONS

■3.3V to 2.8V ATX Power Supplies

■3.3V to 2.9V for Portable PENTIUM^TMProcessor

■5V to 3.5V VRE Supply

■High efficiency "Green" Computer Systems

Now Available in Lead Free Packaging

DESCRIPTION

The SPX1582 is a 3A Low Dropout Regulator with extremely low dropout voltage. The adjustable version requires only

two external resistors to set the output voltage. The fixed version has a preset output of 3.3V, 2.8V or 2.5V and does

not require any external resistors. The SPX1582 features a low dropout of 400mV(Typ.) and offers fast transient

response. This device is suitable for Pentium applications requiring 2.8V, 2.5V from 3.3V ATX power supplies, where

low current input voltage 1V greater than the output voltage is needed. With an external sense pin the load regulation

is less than 1mV. This device is an excellent choice for the use in powering low voltage microprocessors that require

alowerdropout,fasttransientresponsetoregulatefrom3.3Vand5Vsupplies.TheSPX1582isalsoanexcellentchoice

as a post regulator for switching supply applications.

The SPX1582 offers protection against over-current faults, reversed input polarity, over temperature operation and

positive or negative transient voltages.

The SPX1582 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal regulators. For

5A, 3A and 1.5A ultra low dropout versions refer to SPX1581, SPX1582 and SPX1583 data sheets respectively.

TYPICAL APPLICATIONS CIRCUIT

V_IN

V_OUT

2.5V

3.3V

V_IN

V_OUT

V_IN

V_OUT

2.5V

3.3V

V_IN

SPX1582

330μF

V_OUT

SPX1582

330μF

V_CTRL

SENSE

V_CTRL

SENSE

ADJ

124Ω

GND

2x330μF

10μF

.033μF

124Ω

(1) V_CTRLneeded when V_IN< 5V.

(2) V_OUT= V_REF(1+R₂/R₁)+I_ADJR₂.

(3) V_REFis measured across adjust to sense.

Adjustable Regulator

Typical Fixed Regulator

Jun 17-06 Rev F

SPX1582 3A Ultra Low Dropout Voltage Regulator

ABSOLUTE MAXIMUM RATINGS

V_CTRLInput Voltage ....................................................... 13V

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

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

Operating Junction Temperature Range

SPX1582 Control Section ............................. 0°C to +125°C

SPX1582 Power Transistor .......................... 0°C to +150°C

Input Supply Voltage ................................................ 6V

ELECTRICAL CHARACTERISTICS

Electrical characteristics at V_OUT= V_SENSE, V_ADJ= 0V, T_A=25°C, C_CTL= C_PWR= C_OUT= 33μF tantalum cap unless

otherwise specified. The ♦ denotes the specifications which apply over full temperature range -40°C to +85°C, unless

otherwise specified.

PARAMETER

2.5V Version

Output Voltage

MIN

TYP MAX UNITS

CONDITIONS

2.450

2.400

2.5

2.8

2.550

2.600

V_CTRL= 6.0V to 12V, V_IN= 3.0V to 5.0V, I_O=10mA

♦ꢀ I_O= 10mA to 3A

2.8V Version

Output Voltage

2.744

2.688

2.856

2.912

V_CTRL= 6.3V to 12V, V_IN=3.3V + 0.8V, I_O=10mA

♦ꢀ I_O= 10mA to 3A

3.3V Version

Output Voltage

3.234

3.168

3.3

3.366

3.432

V_CTRL= 6.3V to 12V, V_IN= 3.3V + 0.8V, I_O=10mA

♦ꢀ I_O= 10mA to 3A

All Voltage Options

Reference Voltage

1.238 1.25 1.263

V_CTRL= 2.75V, V_IN= 2.00V, I_O= 10mA

V_CTRL=2.7V to 12V,V_IN= 2.05V to 5.5V,I_O=10mA to 7A

V_CTRL= 2.5V to 12V, V_IN= 1.75 to 5.5V, I_O=10mA

♦ꢀ V_ADJ= 0V

Line Regulation

1.0

3.0

5.0

Load Regulation (Note 1)

♦ꢀ V_CTRL= 2.75V, V_IN= V_{OUT +}1.5V, I_O=10mA to 3A, V_ADJ=

Dropout Voltage Min. V_CTRL

(Note 2) (V_IN- V_OUT

Dropout Voltage Min. V_IN

1.05

0.40

1.18

0.50

V_ADJ= 0V

V_IN= 2.05V, I_O= 1A

V_ADJ= 0V

)

(Note 2) (V_IN- V_OUT

)

V_IN= 2.75V, I_O= 3A

Current Limit

Minimum Load Current

3.1

V_CTRL= 2.75V, V_IN= 2.05V, Δ V_OUT= 100mV, V_ADJ= 0V

♦ꢀ V_CTRL= 5V, V_IN=3.3V, V_ADJ=0V

Thermal Regulation

Ripple Rejection

0.002 0.02

%/W

30ms Pulse

V_CTRL= 3.75V, V_IN= 3.75V, I_O= 2.3A, V_ADJ=0V

T_J=25, V_RIPPLE=1Vpp at 120Hz

♦ꢀ V_ADJ= 0V

V_CTRL= 2.75V, V_IN= 2.05V, I_O= 3A

V_CTRL= 2.75V, V_IN= 2.05V, V_ADJ=0V, I_O= 10mA

♦

Control Pin Current

120

Adjustble Pin Current

μA

120

29.3

Thermal Resistance

TO-220-5

Thermal Resistance

TO-263-5

°C/W

Junction to Case (θ )

Junction to Ambient (θ

)

Junction to Case (θ )

31.2

Junction to Ambient (θ

Note 1: Low duty cycle pulse testing with Kelvin connections is required to order to maintain accurate data.

Note 2: Dropout voltage is defined as the minimum differential between V_INand V_OUTor V_CTRLand V_OUTrequired to

maintain regulation at V_OUT95% Nominal V_OUT

Note 3: V_REFis measured across Adjust pin to Sense pin.

Jun 17-06 Rev F

SPX1582 3A Ultra Low Dropout Voltage Regulator

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

SENSE

Allows Kelvin sense of V_OUTat the load. (Positive side of the

reference voltage of the device).

ADJ

Negative side of the reference voltage for the device. Adding a small

bypass capacitor from the ADJ pin to ground will improve the transient

response.

V_OUT

V_CTRL

Power output of the device.

Supply pin for the control circuitry of the device. The current flow into this

pin will be about 1% of the output current. V_CTRLmust be between 1.0V

and 1.3V greater than the output voltage for the device to regulate.

V_IN

Output load current is supplied through this pin. V_INmust be between 0.1V

and 0.8V greater than the output voltage for this device to regulate.

Note that TAB is internally connected to Pin 3.

FUNCTIONAL DIAGRAM

(4) V_CTRL

V_IN(5)

LIMIT

CURRENT

LIMIT

AMPLIFIER

V_OUT(3)

SENSE

THERMAL OVERLOAD

SENSE (1)

ADJ (2)

VOLTAGE

REGULATION

AMPLIFIER

V_REF

Jun 17-06 Rev F

SPX1582 3A Ultra Low Dropout Voltage Regulator

APPLICATION INFORMATION

The SPX1582 is designed as a high performance

and low cost solution for applications requiring

a lower dropout than traditional NPN regulators.

Adjustable Regulator Design

1.25V reference voltage is being developed be-

tween the SENSE pin and the ADJ pin of the

SPX1582.Addingtwoexternalresistors(seefig

1.) will allow setting the output voltage from

1.25V to 6V. R₁is chosen so that this current is

specified at a minimum load current of 10mA.

R₂is given by the formula:

TheSPX1582usesaseparateinputvoltageV_CTRL

( V_CTRL≥ V_OUT+ 1.3V) to minimize the dropout

voltage. This allows the 2.5V power for the load

to come from a 3.3V system supply. As an added

benefitthiswillreducethe heatdissipation*, and

lower heatsink and cooling fan costs.

V_OUT= V_REF(1+ R₂/R₁) + I_ADJ(R₂).

The SPX1582 can power the 2.5V core voltage

ThecurrentflowingfromtheADJpinistypicaly

50μA. This ADJ pin contributes to the final

V_OUTbut is usually neglected. Connecting the

sense pin to the top of the resistor divider will

improve load regulation.

for microprocessors such as a PentiumPC

P55C , AMD5k86 and K6 and the IBM

PowerPC 603EV and 604EV processors.

Atypicalapplicationwoulduse3.3VforV_INand

5.0V for V_CTRLfrom a motherboard power sup-

ply to provide a nominal 2.5V output. Using the

sense pin provides a Kelvin measurement of

output for reducing resistance-associated errors.

Lowering Noise

For the fixed voltage device, adding a capacitor

at the GND pin will improve transient response.

This capacitor is chosen in the range of 1μF to

0.1μF and will depend on the amount of output

capacitance in the system.

Power Up Sequencing

The SPX1582 requires a power up sequence in

thatVIN must beappliedbeforeVCTRL toprevent

a latchup condition. If this is not possible, then a

10Ω series resistor should be added to the VCTRL

input to prevent the device from entering into

latchup if VCTRL is applied before VIN.

Jun 17-06 Rev F

SPX1582 3A Ultra Low Dropout Voltage Regulator

PACKAGE: 5 Pin TO-220

Jun 17-06 Rev F

SPX1582 3A Ultra Low Dropout Voltage Regulator

PACKAGE: 5 Pin TO-263

Seating

Plane

E/2

Chamfer

Optional

SIDE VIEW

See Detail C

FRONT VIEW

Gauge Plane

Seating

Plane

DETAIL C

Thermal

Pad

BACK VIEW

5 Pin TO-263 JEDEC TO-263

Variation BA

(L1)

Dimensions in Millimeters

Conversion Factor:

1 Inch = 25.40 mm

Dimensions in Inches:

Controlling Dimension

SYMBOL

MIN

NOM

MAX

0.190

0.010

0.039

0.029

0.065

0.380

MIN

4.06

0.00

0.51

0.38

1.14

8.38

6.86

9.65

6.22

NOM

MAX

4.83

0.25

0.99

0.74

1.65

9.65

0.160

0.000

0.020

0.015

0.045

0.330

0.270

0.380

0.245

0.420

10.67

.067 BSC

1.702 BSC

0.575

0.070

0.625

0.110

0.066

14.61

1.78

15.88

2.79

1.68

.010 BSC

0.254 BSC

0˚

8˚

0˚

8˚

SIPEX Pkg Signoff Date/Rev:

JL Jun12-06 / Rev B

Jun 17-06 Rev F

SPX1582 3A Ultra Low Dropout Voltage Regulator

ORDERING INFORMATION

Output Voltage Packages

Part Number

Accuracy

SPX1582U5 ............................... 2.0%............................. Adj.......................... 5-Pin TO-220

SPX1582U5-2-5 ......................... 2.0%............................ 2.5V ........................ 5-Pin TO-220

SPX1582U5-2-8 ......................... 2.0%............................ 2.8V ........................ 5-Pin TO-220

SPX1582U5-3-3 ......................... 2.0%............................ 3.3V ........................ 5-Pin TO-220

SPX1582T5 ................................ 2.0%............................. Adj.......................... 5-Pin TO-263

SPX1582T5/TR .......................... 2.0%............................. Adj.......................... 5-Pin TO-263

SPX1582T5-1-5 ......................... 2.0%............................ 2.5V ........................ 5-Pin TO-263

SPX1582T5-1-5/TR.................... 2.0%............................ 2.5V ........................ 5-Pin TO-263

SPX1582T5-1-8 ......................... 2.0%............................ 2.5V ........................ 5-Pin TO-263

SPX1582T5-1-8/TR.................... 2.0%............................ 2.5V ........................ 5-Pin TO-263

SPX1582T5-2-5 ......................... 2.0%............................ 2.5V ........................ 5-Pin TO-263

SPX1582T5-2-5/TR.................... 2.0%............................ 2.5V ........................ 5-Pin TO-263

SPX1582T5-2-8 ......................... 2.0%............................ 2.8V ........................ 5-Pin TO-263

SPX1582T5-2-8/TR.................... 2.0%............................ 2.8V ........................ 5-Pin TO-263

SPX1582T5-3-3 ......................... 2.0%............................ 3.3V ........................ 5-Pin TO-263

SPX1582T5-3-3/TR.................... 2.0%............................ 3.3V ........................ 5-Pin TO-263

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

Example: SPX1582T5-3-3/TR = standard; SPX1582T5-L-3-3/TR = lead free.

/TR = Tape and Reel

Pack quantity is 500 for TO-263.

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.

Jun 17-06 Rev F

SPX1582 3A Ultra Low Dropout Voltage Regulator

SPX1582_06 [SIPEX]

相关型号：

SPX1583

SPX1583

SPX1583T

SPX1583T-1.5

SPX1583T-2.5

SPX1583T-3.0

SPX1583T-3.3

SPX1583T-L-1.5

SPX1583T-L-2.5

SPX1583T-L-3.0

SPX1583T-L-3.3

SPX1583T5