International Rectifier IRU1117-18CY, IRU1117-18CS, IRU1117-18CP, IRU1117-18CD Datasheet
Data Sheet No. PD94137
IRU1117-18
800mA LOW DROPOUT POSITIVE
FIXED 1.8V REGULATOR
PRELIMINARY DATA SHEET
FEATURES
Guaranteed < 1.2V Dropout at 800mA 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
3.3V
C1
10uF
DESCRIPTION
The IRU1117-18 is a low dropout three-terminal fixed output regulator with minimum of 800mA 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
IRU1117-18 is guaranteed to have <1.2V dropout at full
load current making it ideal to provide well regulated with
3.8V input supply. The IRU1117-18 is specifically designed to be stable with low cost aluminum capacitors
while maintaining stability with low ESR tantalum caps.
Vin
3
IRU1117-18
Vout
2
Gnd
1
Figure 1 - Typical set-up of the IRU1117-18 in a 3.3V to 1.8V regulator application
PACKAGE ORDER INFORMATION
Tj (°C) 2-PIN PLASTIC 3-PIN PLASTIC 2-PIN PLASTIC 8-PIN PLASTIC
TO-252 (D-Pak) SOT-223 (Y) Ultra Thin-Pak (P) SOIC (S)
0 To 125 IRU1117-18CD IRU1117-18CY IRU1117-18CP IRU1117-18CS
1.8V / 800mA
C2
10uF
Rev. 1.1
06/29/01
1
IRU1117-18
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) .................................................... 7V
Power Dissipation ..................................................... Internally Limited
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 125°C
PACKAGE INFORMATION
2-PIN PLASTIC TO-252 (D-Pak) 3-PIN PLASTIC SOT-223 (Y) 2-PIN ULTRA THIN-PAK (P) 8-PIN PLASTIC SOIC (S)
FRONT VIEW
3
Vin
Tab is
Vout
1
Gnd
JA=70°C/W for 0.5" Sq pad θJA=90°C/W for 0.4" Sq pad θJA =70°C/W for 0.5" Sq pad θJA=55°C/W for 1" Sq pad
θ
Tab i s
Vou t
TOP VIEW
3
Vin
2
Vou t
1
Gnd
Tab is
Vout
FRONT VIEW
3
Vin
1
Gnd
Vin
NC
NC
TOP VIEW
1
2
3
4
8
Vout
7
Vout
6
Vout
5
VoutGnd
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Cin=1µF, Vin=5V,Cout=10µF, and Tj=0 to 125!C.
Typical values refer to Tj=25!C.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Output Voltage Vo Io=10mA, Tj=25!C 1.782 1.800 1.818 V
Io=10mA 1.764 1.800 1.896
Line Regulation Io=10mA, 4.75V<Vin<7V 7 mV
Load Regulation (Note 1) 10mA<Io<800mA 17 mV
Dropout Voltage (Note 2) Io=1A 1.2 1.3 V
Io=800mA 1.1 1.2
Current Limit dVo=100mV 1.1 A
Thermal Regulation 30ms Pulse, Io=800mA 0.01 %/W
Ripple Rejection f=120Hz, Co=25µF Tantalum,
Io=0.5A 70 dB
Temperature Stability Io=10mA 0.5 %
Long Term Stability Tj=125!C, 1000Hrs 0.3 %
RMS Output Noise Tj=25!C, 10Hz<f<10KHz 0.003 %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.
2
Rev. 1.1
06/29/01
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