International Rectifier IRU1117CP, IRU1117CS, IRU1117CD, IRU1117CY Datasheet
Data Sheet No. PD94136
IRU1117
800mA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
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
VGA & Sound Card Applications
Low Voltage High Speed Termination Applications
Standard 3.3V Chip Set and Logic Applications
TYPICAL APPLICATION
D1
5V
C1
10uF
DESCRIPTION
The IRU1117 is a low dropout, three-terminal adjustable
regulator with minimum of 800mA output current capability. This product is specifically designed to provide
well regulated supply for low voltage IC applications such
as high speed bus termination and low current 3.3V logic
supply. The IRU1117 is also well suited for other applications such as VGA and sound cards. The IRU1117 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.
IN
V
3
IRU1117
OUT
V
2
R1
121
Gnd
1
R2
154
Figure 1 - Typical application of IRU1117 in a 5V to 2.85V SCSI termination regulator.
C2
10uF
2.85V / 800mA
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 150 IRU1117CD IRU1117CY IRU1117CP IRU1117CS
Rev. 1.5
09/13/01
1
IRU1117
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 150°C
PACKAGE INFORMATION
2-PIN PLASTIC TO-252 (D-Pak) 3-PIN PLASTIC SO-223 (Y) 2-PIN ULTRA THIN-PAK (P) 8-PIN PLASTIC SOIC (S)
Tab i s
OUT
V
FRONT VIEW
3
V
IN
Tab is
1
Adj
TOP VIEW
3
IN
V
2
V
V
OUT
OUT
1
Adj
θJA=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
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=1µF, C OUT=10µF, and TJ=0 to 150!C.
Typical values refer to TJ=25!C.
Tab is
OUT
V
FRONT VIEW
3
V
IN
1
Adj
V
NC
NC
Adj
IN
TOP VIEW
1
2
3
4
8
V
OUT
7
V
OUT
6
V
OUT
5
V
OUT
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage VREF Io=10mA, TJ=25!C, (VIN-Vo)=1.5V 1.238 1.250 1.262 V
Io=10mA, (VIN-Vo)=1.5V 1.225 1.250 1.275
Line Regulation Io=10mA, 1.3V<(VIN-Vo)<7V 0.2 %
Load Regulation (Note 1) VIN=3.3V, VADJ=0, 10mA<Io<800mA 0.4 %
Dropout Voltage Io=1A 1.2 1.3 V
(Note 2) ∆Vo Io=800mA, Note 2 1.1 1.2
Current Limit VIN=3.3V, ∆Vo=100mV 1.1 A
Minimum Load Current VIN=3.3V, VADJ=0V 5 10 mA
(Note 3)
Thermal Regulation 30ms Pulse, VIN-Vo=3V, Io=800mA 0.01 0.02 %/W
Ripple Rejection f=120Hz, Co=25µF Tantalum
Io=0.5A, VIN-Vo=3V 60 70 dB
Adjust Pin Current IADJ Io=10mA, VIN-Vo=1.5V, TJ=25!C,
Io=10mA, VIN-Vo=1.5V 55 120 µA
Adjust Pin Current Change Io=10mA, VIN-Vo=1.5V, TJ=25!C 0.2 5 µA
Temperature Stability VIN=3.3V, VADJ=0V, Io=10mA 0.5 %
Long Term Stability TJ=125!C, 1000Hrs 0.3 1 %
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 3: Minimum load current is defined as the minimum current required at the output in order for the out-
put voltage to maintain regulation. Typically, the resistor
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.
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. 1.5
09/13/01
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