IRU1247-25CPPBF datasheet, PDF

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IRU1247-25CPPBF: DescriptionFixed Positive LDO Regulator, 2 Output, 3.3V1, 2.5V2, PSSO5, ULTRA THIN PAK-5; CategoryPower/power management The power supply circuit; File Size105KB，8 Pages; ManufacturerInternational Rectifier （ Infineon ）; Websitehttp://www.irf.com/; Environmental Compliance

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IRU1247-25CPPBF Overview

Fixed Positive LDO Regulator, 2 Output, 3.3V1, 2.5V2, PSSO5, ULTRA THIN PAK-5

IRU1247-25CPPBF Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
Maker	International Rectifier （ Infineon ）
Parts packaging code	MODULE
package instruction	TO-263,
Contacts	5
Reach Compliance Code	compli
ECCN code	EAR99
Maximum drop-back voltage 1	1.3 V
Maximum drop-back voltage 2	1.3 V
JESD-30 code	R-PSSO-G5
length	9.36 mm
Number of functions	1
Output times	2
Number of terminals	5
Working temperatureTJ-Max	150 °C
Operating temperatureTJ-Mi
Maximum output current 1	2 A
Maximum output current 2	2 A
Maximum output voltage 1	3.7 V
Minimum output voltage 1	3.2 V
Nominal output voltage 1	3.3 V
Maximum output voltage 2	2.55 V
Minimum output voltage 2	2.45 V
Nominal output voltage 2	2.5 V
Package body material	PLASTIC/EPOXY
encapsulated code	TO-263
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Regulator type	FIXED POSITIVE MULTIPLE OUTPUT LDO REGULATOR
Maximum seat height	2.16 mm
surface mount	YES
Terminal form	GULL WING
Terminal pitch	1.72 mm
Terminal location	SINGLE
Maximum time at peak reflow temperature	40
width	8 mm

IRU1247-25CPPBF Preview

Data Sheet No. PD94254

IRU1246 / IRU1247-18 / IRU1247-25

2A FIXED AND ADJUSTABLE

DUAL VOLTAGE REGULATOR

PRELIMINARY DATA SHEET

FEATURES

Low Dropout Voltage

Fast Transient Response

Built-In Thermal Shutdown

Output Current Limiting

D-Pak, Ultra Thin-Pak and SOIC

Fixed 3.3V and Adjustable, or Fixed 3.3V and 1.8V,

or Fixed 3.3V and 2.5V

DESCRIPTION

The IRU1246/47 family of voltage regulators contain two

integrated, low dropout linear voltage regulators in three

different packages, such as new 5-Pin Ultra Thin-Pak

surface mount, 5-Pin D-Pak and 8-Pin SOIC. The

IRU1246 provides 3.3V fixed and adjustable outputs. The

IRU1247-18 provides fixed 3.3V and 1.8V. The IRU1247-

25 provides fixed 3.3V and 2.5V output. These products

are stable with both Ceramic and Tantalum output ca-

pacitors. The adjustable output provides a voltage from

1.25V and up using a simple resistor divider. The input

supply for both regulators is supplied from a single 5V

supply. Each regulator is capable of 2 amps continuous

load current. Both outputs, for each device, are current

limit protected as well as having a thermal shutdown

that protects the device from excessive temperature.

APPLICATIONS

Motherboard with Multiple Supplies

Hard Disk Drivers, CD-ROMs, DVDs

ADSL and Cable Modems

High Efficiency Linear Regulators

TYPICAL APPLICATION

3.3V

Vout1

4.7uF

Y5V Ceramic

10uF

Tant

100

IRU1246

Vout2

Gnd

Vadj

Vin

2.5V

4.7uF

Y5V Ceramic

Vin

Vo = Vref

×o

1 +

Figure 1 - Typical application of IRU1246 in 5-Pin TO-252 (D-Pak) package.

Note:

All caps must be located as close to the pins as physically possible using a plane connection.

PACKAGE ORDER INFORMATION

(°C)

0 To 150

Rev. 1.6

07/13/01

5-PIN

TO-252 (D-Pak)

IRU1246CD

IRU1247-18CD

IRU1247-25CD

5-PIN TO-263

8-PIN PLASTIC

Ultra Thin-Pak (P) SOIC POWER (S)

IRU1246CP

IRU1246CS

IRU1247-18CP

IRU1247-18CS

IRU1247-25CP

IRU1247-25CS

OUTPUT

VOLTAGE #1

3.3V Fixed

OUTPUT

VOLTAGE #2

Adjustable

1.8V Fixed

2.5V Fixed

IRU1246 / IRU1247-18 / IRU1247-25

ABSOLUTE MAXIMUM RATINGS

Input Voltage (V

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

Storage Temperature Range ...................................... -65°C To 150°C

Operating Junction Temperature Range ..................... 0°C To 150°C

PACKAGE INFORMATION

5-PIN PLASTIC TO-252 (D-Pak)

FRONT VIEW

5-PIN ULTRA THIN-PAK (P)

FRONT VIEW

8-PIN PLASTIC POWER SOIC (S)

TOP VIEW

8 Gnd

7 Gnd

6 Gnd

5 Gnd

Vin 1

NC 2

Vout1 3

Vout2 4

8 Gnd

7 Gnd

6 Gnd

5 Gnd

Vout2

Vout1

Gnd

Vin

Vout1

Vout2

Gnd

Vadj

Vin

Vout2

Vout1

Gnd

Vin

Vout1

Vout2

Gnd

Vadj

Vin

Vin 1

Vadj 2

Vout2 3

Vout1 4

IRU1246

IRU1247

IRU1246

IRU1247

IRU1246

IRU1247

=358C/W with 1" Copper area

=25$C/W with 1" Copper area

=55°C/W for 1" Sq pad

ELECTRICAL SPECIFICATIONS

Unless otherwise specified, these specifications apply over Vin=5.0V, Cin=Cout=4.7µF. Typical values refer to

=25°C. I

FL1

=2A, I

FL2

=2A

PARAMETER

SYM

Output Voltage #1

Output Voltage #2(IRU1246)

Output Voltage #2(IRU1247-18) Vo

Output Voltage #2(IRU1247-25) Vo

Line Regulation

Reg

LINE

Load Regulation

Reg

LOAD

Dropout Voltage (Output #1)

DO1

Dropout Voltage (Output #2)

DO2

Current Limit (Output #1)

Current Limit (Output #2)

Minimum Load Current

(Output #1)

1(MIN)

Minimum Load Current

(Output #2)

2(MIN)

Thermal Regulation

Reg

therm

Ripple Rejection

(Vcc to Output #1)

PSRR

Ripple Rejection

(Vcc to Output #2)

PSRR

Temperature Stability

Stab

TEMP

Long Term Stability

Stab

LONG

RMS Output Noise

Vin Quiescent current

TEST CONDITION

=10mA, T

=25°C

=10mA, T

=0 to 125°C

=10mA, T

=25°C, Vo=Vadj

=10mA, T

=0 to 125°C, Vo=Vadj

=10mA, T

=25°C

=10mA, T

=0 to 125°C

=10mA, T

=25°C

=10mA, T

=0 to 125°C

Io=10mA, Vcc ±5%

Note 1, 10mA<Io<I

Note 2, Io

= I

FL1

Note 2, Io

= I

FL2

∆Vo

=10% below regulation

∆Vo

=10% below regulation

Note 3, 5

Note 5, 30ms pulse, Io=I

Note 5,100Hz<f<100KHz,Io=I

FL1

/10

Note 5,100Hz<f<100KHz, Io=I

FL2

/10

Note 4, 5, Io =10mA

Note 5, T

=125°C, 1000Hrs

Note 5, 10Hz<f<10KHz

=Io

MIN

3.230

3.200

1.238

1.225

1.782

1.764

2.475

2.450

TYP

3.300

1.250

1.800

2.500

0.2

0.4

1.1

MAX

3.370

3.400

1.262

1.275

1.818

1.836

2.525

2.550

UNITS

%Vo

%/Watt

%Vo

1.3

2.1

0.1

0.5

0.3

0.003

Rev. 1.6

07/13/01

IRU1246 / IRU1247-18 / IRU1247-25

Note 1:

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

Note 2:

Dropout voltage is defined as the minimum differential voltage between Vin and Vout required to maintain

regulation at Vout. It is measured when the output voltage drops 1% below its nominal value.

Note 3:

Minimum load current is defined as the minimum current required at the output in order for the output

voltage to maintain regulation.

Note 4:

Temperature stability is the change in output from nominal over the operating temperature range.

Note 5:

Guaranteed by design, but not tested in production.

PIN DESCRIPTIONS

IRU1246

PIN # PIN SYMBOL

Vin

PIN DESCRIPTION

The power input pin of the regulator. Typically a large storage capacitor is connected from

this pin to ground to insure that the input voltage does not sag below the minimum dropout

voltage during the load transient response. This pin must always be higher than both Vout

pins by the amount of the dropout voltage in order for the device regulate properly.

A resistor divider from this pin to Vout2 (pin4) and ground sets the output voltage.

This pin is connected to ground. It is also the TAB of the Ultra Thin-Pak package.

The output #2 (adjustable) of the regulator. A minimum of 4.7µF capacitor must be con-

nected from this pin to ground to insure stability.

The output #1 (3.3V) of the regulator. A minimum of 4.7µF capacitor must be connected

from this pin to ground to insure stability.

Vadj

Gnd

Vout2

Vout1

IRU1247-18, IRU1247-25

PIN # PIN SYMBOL

Vin

PIN DESCRIPTION

The power input pin of the regulator. Typically a large storage capacitor is connected from

this pin to ground to insure that the input voltage does not sag below the minimum dropout

voltage during the load transient response. This pin must always be higher than both Vout

pins by the amount of the dropout voltage in order for the device to regulate properly.

No connection.

This pin is connected to ground. It is also the TAB of the Ultra Thin-Pak package.

The output #1 (1.8V for 1247-18 and 2.5V for 1247-25) of the regulator. A minimum of

4.7µF capacitor must be connected from this pin to ground to insure stability.

The output #2 (3.3V) of the regulator. A minimum of 4.7µF capacitor must be connected

from this pin to ground to insure stability.

Gnd

Vout1

Vout2

Rev. 1.6

07/13/01

IRU1246 / IRU1247-18 / IRU1247-25

APPLICATION INFORMATION

Thermal

The following thermal design check illustrates the method

used to calculate the maximum junction temperature of

the regulator.

Power Flex Package (Ultra Thin-Pak)

THJA

= 25°C/W (Note 1)

= 45°C

= 5V

2.5

= 0.30A

3.3

= 0.80A

2.5

= 2.5V

3.3

= 3.3V

= (V

-V

3.3

)

3.3

+ (V

-V

2.5

)

2.5

= (5 -3.3)

0.8 + (5-2.5)

0.3 = 2.11W

∆T

= P

THJA

= 2.11

25 = 53°C

= T

∆T

= 45 + 53 = 98°C

= 98°C

Note 1:

This thermal impedance is for a four-layer board

mounted on a minimum of one inch square area. It is

possible to further reduce this by mounting the device

close to other thermally conductive elements such as

mounting screws.

Layout Consideration

The IRU1246/1247-xx like many other high speed regu-

lators requires that the output capacitors to be close to

the device for stability reasons. For power consideration,

a ground plane pad of approximately one inch square

pad on the component side must be dedicated to the

device where all ground pins are connected to dissipate

the power. If multilayer board is used, it is recommended

that the inner layers of the board are also dedicated to

the size of the pad for better thermal characteristics.

Rev. 1.6

07/13/01

IRU1246 / IRU1247-18 / IRU1247-25

TYPICAL APPLICATION

3.3V

Gnd

Vout1

4.7uF

Y5V Ceramic

Vout2

IRU1246

Vadj

Vin

2.5V

100

4.7uF

Y5V Ceramic

10uF

Tant

Vin

Note:

All caps must be located as

close to the pins as physically pos-

sible using a plane connection.

Figure 2 - Typical application of IRU1246 in power 8-Pin SOIC package.

3.3V

Vout1

10uF

Tant

100, 1%

4.7uF

Y5V Ceramic

IRU1246

Vout2

Gnd

Vadj

Vin

2.5V

4.7uF

Y5V Ceramic

Vin

Note:

All caps must be located as

close to the pins as physically pos-

sible using a plane connection.

Figure 3 - Typical application of IRU1246 in 5-Pin Ultra Thin-Pak package.

Rev. 1.6

07/13/01

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