IOR IRU1010-25 User Manual
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Data Sheet No. PD94120
IRU1010-25
1A LOW DROPOUT POSITIVE
FIXED 2.5V REGULATOR
FEATURES
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
Available in SOT-223, D-Pak, Ultra Thin-Pak
and 8-Pin SOIC Surface-Mount Packages
APPLICATIONS
Low Voltage IC Supply Applications
PC Clock Supply Voltage
TYPICAL APPLICATION
5V
C1
10uF
V
IN
3
TM
DESCRIPTION
The IRU1010-25 is a low dropout three-terminal fixed output regulator with minimum of 1A output current capability. This product is specifically designed to provide well
regulated supply for low voltage IC applications as well
as generating clock supply for PC applications. The
IRU1010-25 is guaranteed to have <1.3V dropout at full
load current making it ideal to provide well regulated with
3.8V input supply. The IRU1010-25 is specifically designed to be stable with low cost aluminum capacitors
while maintaining stability with low ESR tantalum caps.
IRU1010-25
V
OUT
2
Gnd
1
Figure 1 - Typical application of IRU1010-25 in a 5V to 2.5V regulator.
PACKAGE ORDER INFORMATION
TJ (°C) 2-PIN PLASTIC 2-PIN PLASTIC 8-PIN PLASTIC 3-PIN PLASTIC
TO-252 (D-Pak) Ultra Thin-PakTM (P) SOIC (S) SOT-223 (Y)
0 To 150 IRU1010-25CD IRU1010-25CP IRU1010-25CS IRU1010-25CY
2.5V / 1A
C2
10uF
Rev. 1.4
02/03/03
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IRU1010-25
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V IN) .................................................... 7V
Power Dissipation ...................................................... Internally Limited
Storage Temperature Range ....................................... -65°C To 150°C
Operating Junction Temperature Range ...................... 0°C To 150°C
PACKAGE INFORMATION
2-PIN PLASTIC TO-252 (D-Pak) 2-PIN ULTRA THIN-PAK
TM
(P) 8-PIN PLASTIC SOIC (S) 3-PIN PLASTIC SOT-223 (Y)
Tab is
V
OUT
3
V
IN
Tab is
V
OUT
1
Gnd
3
V
IN
1
Gnd
NC
NC
Gnd
1
V
IN
2
3
4
8
V
OUT
7
V
OUT
6
V
OUT
5
V
OUT
Tab is
V
OUT
3
V
IN
2
V
OUT
1
Gnd
θJA=70°C/W for 0.5" Sq pad θJA=70°C/W for 0.5" Sq pad θJA=55°C/W for 1" Sq pad θJA=90°C/W for 0.4" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=1mF, VIN=5V, COUT=10mF and TJ=0 to 1258C.
Typical values refer to TJ=258C.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Output Voltage
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Note 2)
Current Limit
Thermal Regulation
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise
Io=10mA, TJ=258C
Vo 2.475
Io=10mA
2.450
Io=10mA, 4.75V<VIN<7V
10mA<Io<1A
Io=1A
DVo=100mV
1.1
30ms Pulse, Io=1A
f=120Hz, Co=25mF Tantalum,
Io=0.5A
60
Io=10mA
TJ=1258C, 1000Hrs
TJ=258C, 10Hz<f<10KHz
2.500
2.500
0.01
70
0.5
0.3
0.003
2.525
2.550
7
17
1.3
0.02
1
V
mV
mV
V
A
%/W
dB
%
%
%Vo
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.
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Rev. 1.4
02/03/03
PIN DESCRIPTIONS
PIN# PIN SYMBOL PIN DESCRIPTION
1
Gnd
Ground pin. This pin must be connected to ground plane using a low inductance short
connection.
IRU1010-25
2
3
VOUT
VIN
The output of the regulator. This pin is also connected to the tab of the package. An
output capacitor must be connected to this pin to insure stability of the regulator.
Input pin of the regulator.
BLOCK DIAGRAM
VIN 3
CURRENT
LIMIT
THERMAL
SHUTDOWN
2 VOUT
+
1.25V
+
1 Gnd
Rev. 1.4
02/03/03
Figure 2 - Simplified block diagram of the IRU1010-25.
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
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
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