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IRU1117
800mA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
Data Sheet No. PD94136
International
TOR Rectifier
800mA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
FEATURES DESCRIPTION
El Guaranteed < 1.2V Dropout at 800mA Load The IRU1117 is a low dropout, three-terminal adjustable
Current regulator with minimum of 800mA output current capa-
El Fast Transient Response bility. This product is specifically designed to provide
El 1% Voltage Reference Initial Accuracy well regulated supply for low voltage IC applications such
El Built-ln Thermal Shutdown as high speed bus termination and low current 3.3V logic
El Available in SOT-223, D-Pak, Ultra Thin-PakTM supply. The |RU1117 is also well suited for other applica-
tions such as VGA and sound cards. The |RU1117 is
guaranteed to have <1.2V dropout at full load current
making it ideal to provide well regulated outputs of 2.5V
to 3.6V with 4.75V to 7V input supply.
and 8-Pin SOIC Surface-Mount Packages
APPLICATIONS
EI VGA & Sound Card Applications
El Low Voltage High Speed Termination Applications
EI Standard 3.3V Chip Set and Logic Applications
TYPICAL APPLICATION
WHTQLT
W T---
|RU1117
Vow E . 2.85V/800mA
R2 1OUF
Figure 1 - Typical application of IRU1117 in a 5V to 2.85V SCSI termination regulator.
PACKAGE ORDER INFORMATION
To (°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)
OTO150 |RU1117CD |RU1117CP lRU1117CS |RU1117CY
Rev. 1.8
02/04/03
IRU1117
International
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V m) ....................................................
Power Dissipation _....................................................
Storage Temperature Range ......................................
Operating Junction Temperature Range .....................
Internally Limited
-65°C To 150°C
0°C To 150°C
PACKAGE INFORMATION
2-PIN PLASTIC T0-252 (D-Pak) 2-PIN ULTRA THIN-PAKTM (P;
8-PIN PLASTIC SOlC (S) 3-PIN PLASTIC SOT-223 (Y)
FRONT VIEW
VIN 3 j VIN
Tab is
VOUT l
Adj Cl Adj
0JA=70°CIW for 0.5" Sq pad 0JA=70°CIW for 0.5" Sq pad
TOP VIEW TOP VIEW
VIN E El VOUT El VIN
NC E Z] \/OUT Tabis l:
NC E E VOUT VOUT El VOUT
Adj E E] Vow El Adj
9JA=55°C/W for 1" Sq pad 0JA=90°CIW for 0.4" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Cm=1iLF, Cout=10piF, and TJ=O to 150°C.
Typical values refer to TJ=25°C.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage VREF lo=10mA, To=25''C, (VIN-VO)=1.5V 1.238 1.250 1.262 V
lo=10mA, (VlN-V0)=1.5V 1.225 1.250 1.275
Line Regulation lo=10mA, 1.3V<(VlN-VO)<7V 0.2 %
Load Regulation (Note 1) Vm=3.3V, VADJ=0, 10mA<|o<800mA 0.4 %
Dropout Voltage (Note 2) AVo lo=1A 1.2 1.3 V
lo=800mA, Note 2 1.1 1.2
Current Limit V|N=3.3V, AVo=100mV 1.1 A
Minimum Load Current (Note 3) Vm=3.3V, VADJ=0V 5 10 mA
Thermal Regulation 30ms Pulse, \AN-Vo=3V, lo=800mA 0.01 0.02 %/W
Ripple Rejection f=120Hz, Co=25wF Tantalum,
lo=0.5A, VIN-V0=3V 60 70 dB
Adjust Pin Current IADJ lo=10mA, 1hN-Vo=1.5V, TJ=25°C,
lo=10mA, VIN-V0=1.5V 55 120 wA
Adjust Pin Current Change lo=10mA, 1hN-Vo=1.5V, TJ=25°C 0.2 5 p.A
Temperature Stability V|N=3.3V, VADJ=0V, |o=10mA 0.5 %
Long Term Stability TJ=125°C, 1000Hrs 0.3 1 %
RMS Output Noise TJ=25°C, 1OHzNote 1: Low duty cycle pulse testing with Kelvin con-
nections is required in order to maintain accurate data.
Note 2: Dropout voltage is dehned as the minimum dif-
ferential voltage between VIN and VOUT required to main-
tain 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 mini-
mum current required at the output in order for the out-
put voltage to maintain regulation. Typically, the resistor
dividers are selected such that it automatically main-
tains this current. Typically, the values of the resistors
used to build the voltage divider are selected to ensure
that minimum load current is maintained.
2
Rev. 1.8
02/04/03
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