iru1247-25 International Rectifier Corp., iru1247-25 Datasheet

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iru1247-25

Manufacturer Part Number
iru1247-25
Description
Fixed Adjustable Dual Voltage Regulator
Manufacturer
International Rectifier Corp.
Datasheet
FEATURES
APPLICATIONS
TYPICAL APPLICATION
Note: All caps must be located as close to the pins as physically possible using a plane connection.
PACKAGE ORDER INFORMATION
Rev. 1.6
07/13/01
0 To 150
0 To 150
0 To 150
T
J
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
Motherboard with Multiple Supplies
Hard Disk Drivers, CD-ROMs, DVDs
ADSL and Cable Modems
High Efficiency Linear Regulators
(°C)
TO-252 (D-Pak)
IRU1246CD
IRU1247-18CD
IRU1247-25CD
Figure 1 - Typical application of IRU1246 in 5-Pin TO-252 (D-Pak) package.
5-PIN
IRU1246
U1
Vin
Ultra Thin-Pak (P) SOIC POWER (S)
IRU1247-18CP
IRU1247-25CP
IRU1246CP
5-PIN TO-263
Vout1
Vout2
Gnd
Vadj
Vin
5
4
3
2
1
IRU1246 / IRU1247-18 / IRU1247-25
C1
10uF
Tant
IRU1247-18CS
IRU1247-25CS
IRU1246CS
8-PIN PLASTIC
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.
DUAL VOLTAGE REGULATOR
2A FIXED AND ADJUSTABLE
R1
100
1%
R2
100
1%
Vo = Vref ×o o o o o 1 +
VOLTAGE #1
3.3V Fixed
3.3V Fixed
3.3V Fixed
OUTPUT
PRELIMINARY DATA SHEET
Data Sheet No. PD94254
C2
4.7uF
Y5V Ceramic
C3
4.7uF
Y5V Ceramic
2.5V
3.3V
R1
R2
p p p p p
VOLTAGE #2
1.8V Fixed
2.5V Fixed
Adjustable
OUTPUT
1

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iru1247-25 Summary of contents

Page 1

... IRU1247-18CD IRU1247-18CP 0 To 150 IRU1247-25CD IRU1247-25CP Rev. 1.6 07/13/01 IRU1246 / IRU1247-18 / IRU1247-25 2A FIXED AND ADJUSTABLE DUAL VOLTAGE REGULATOR 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 ...

Page 2

... IRU1246 / IRU1247-18 / IRU1247-25 ABSOLUTE MAXIMUM RATINGS Input Voltage (V ) .................................................... IN Storage Temperature Range ...................................... -65°C To 150°C Operating Junction Temperature Range ..................... PACKAGE INFORMATION 5-PIN PLASTIC TO-252 (D-Pak) FRONT VIEW FRONT VIEW Vout1 Vout2 4 Gnd 3 3 Vadj 2 2 Vin 1 1 IRU1246 IRU1247 =358C/W with 1" Copper area ...

Page 3

... 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. 5 Vout2 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. Rev. 1.6 07/13/01 IRU1246 / IRU1247-18 / IRU1247-25 3 ...

Page 4

... 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 C/W (Note 1) THJA 0.30A 2 0.80A 3 2.5V 2 3.3V 3 × × I ...

Page 5

... TYPICAL APPLICATION 5 Gnd 6 Gnd U1 IRU1246 7 Gnd 8 Gnd Vin Figure 2 - Typical application of IRU1246 in power 8-Pin SOIC package. U1 IRU1246 Vin Figure 3 - Typical application of IRU1246 in 5-Pin Ultra Thin-Pak package. Rev. 1.6 07/13/01 IRU1246 / IRU1247-18 / IRU1247-25 4 Vout1 3 Vout2 2 Vadj 1 Vin C1 10uF Tant Vout1 5 4 Vout2 3 Gnd R1 100, 1% ...

Page 6

... IRU1246 / IRU1247-18 / IRU1247-25 TYPICAL APPLICATION U1 IRU1247-25 Vin Figure 4 - Typical application of IRU1247-25 in 5-Pin Ultra Thin-Pak and TO-252 (D-Pak) packages. 5 Gnd 6 Gnd U1 IRU1247-25 7 Gnd 8 Gnd Vin Figure 5 - Typical application of IRU1247-25 in power 8-Pin SOIC package. 6 Vout2 5 4 Vout1 3 Gnd Vin C1 10uF Tant 4 Vout2 ...

Page 7

... IRU1247-18 Vin Figure 6 - Typical application of IRU1247-18 in 5-Pin Ultra Thin-Pak and TO-252 (D-Pak) packages. 5 Gnd 6 Gnd U1 IRU1247-18 7 Gnd 8 Gnd Vin Figure 7 - Typical application of IRU1247-18 in power SOIC 8-Pin package. Rev. 1.6 07/13/01 IRU1246 / IRU1247-18 / IRU1247-25 Vout2 5 4 Vout1 3 Gnd Vin C1 10uF Tant 4 Vout2 3 Vout1 ...

Page 8

... IRU1246 / IRU1247-18 / IRU1247-25 IR WORLD HEADQUARTERS : 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 8 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information. Data and specifications subject to change without notice. 02/01 Notes Rev. 1.6 07/13/01 ...

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