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Part: IRU1117CYTR
Category:
Discrete
Description: 0.8A Adj LDO Linear Regulator in a SOT-223 3-Leads Package
Company: International Rectifier Corp.
Datasheet: Download IRU1117CYTR datasheet File size : 278 kB
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Data Sheet No. PD94136
IRU1117
800mA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR 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.
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 TM 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 VI N
3 2 1
R1 121 R2 154 C2 10uF
IRU1117
VO U T
2.85V / 800mA
Adj
Figure 1 - Typical application of IRU1117 in a 5V to 2.85V SCSI termination regulator.
PACKAGE ORDER INFORMATION
TJ (°C) 0 To 150 2-PIN PLASTIC TO-252 (D-Pak) IRU1117CD 2-PIN PLASTIC Ultra Thin-PakTM (P) IRU1117CP 8-PIN PLASTIC SOIC (S) IRU1117CS 3-PIN PLASTIC SOT-223 (Y) IRU1117CY
Rev. 1.8 02/04/03
www.irf.com
1
IRU1117
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .... Power Dissipation ..... Storage Temperature Range ..... Operating Junction Temperature Range ............ 7V Internally Limited -65°C To 150°C 0°C To 150°C
PACKAGE INFORMATION
2-PIN PLASTIC TO-252 (D-Pak)
FRONT VIEW 3
2-PIN ULTRA THIN-PAKTM (P)
FRONT VIEW 3
8-PIN PLASTIC SOIC (S)
TOP VIEW
3-PIN PLASTIC SOT-223 (Y)
TOP VIEW
VIN Tab is VOUT
VIN
Tab is VOUT
1
VIN NC NC Adj
1 2 3 4
8 7 6 5
VOUT VOUT VOUT VOUT Tab is VOUT
3 2 1
VIN VOUT Adj
Adj
1
Adj
JA=70°C/W for 0.5" Sq pad
JA=70°C/W for 0.5" Sq pad
JA=55°C/W for 1" Sq pad
JA=90°C/W for 0.4" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=1mF, COUT=10mF, and TJ=0 to 1508C. Typical values refer to TJ=258C. PARAMETER Reference Voltage Line Regulation Load Regulation (Note 1) Dropout Voltage (Note 2) Current Limit Minimum Load Current (Note 3) Thermal Regulation Ripple Rejection Adjust Pin Current Adjust Pin Current Change Temperature Stability Long Term Stability RMS Output Noise IADJ SYM VREF TEST CONDITION Io=10mA, TJ=258C, (VIN-Vo)=1.5V Io=10mA, (VIN-Vo)=1.5V Io=10mA, 1.3V<(VIN-Vo)<7V VIN=3.3V, VADJ=0, 10mAD VO
1.2 1.1 1.1 5 0.01 60 70 55 0.2 0.5 0.3 0.003
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.
Note 3: Minimum load current is defined as the minimum current required at the output in order for the output voltage to maintain regulation. Typically, the resistor dividers are selected such that it automatically maintains this current. Typically, the values of the resistors used to build the voltage divider are selected to ensure that minimum load current is maintained.
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www.irf.com
Rev. 1.8 02/04/03
IRU1117
PIN DESCRIPTIONS
PIN # 1 2 3 PIN SYMBOL PIN DESCRIPTION Adj A resistor divider from this pin to the VOUT pin and ground sets the output voltage. V OUT VIN The output of the regulator. A minimum of 10mF capacitor must be connected from this pin to ground to insure stability. The input pin of the regulator. Typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the minimum dropout voltage during the load transient response. This pin must always be 1.3V higher than VOUT in order for the device to regulate properly.
BLOCK DIAGRAM
VIN 3 2 VO U T
+ +
1.25V CURRENT LIMIT
THERMAL SHUTDOWN
1 Adj
Figure 2 - Simplified block diagram of the IRU1117.
APPLICATION INFORMATION
Introduction The IRU1117 adjustable Low Dropout (LDO) regulator is a three-terminal device which can easily be programmed with the addition of two external resistors to any voltages within the range of 1.25 to 5.5V. This regulator only needs 1.3V differential to maintain output regulation. Unlike the first generation of the three-terminal regulators such as LM117 that required 3V differential between the input and the regulated output. The IRU1117 is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer output capacitors. This is a key requirement for today's low voltage IC applications that typically need 3.3V supply and are often generated from the 5V supply. Other applications such as high speed memory termination need to switch the load current from zero to full load in tens of nanoseconds at their pins, which translates to an approximately 300 to 500ns current step at the regulator. In addition, the output voltage tolerances are sometimes tight and they include the transient response as part of the specification.
Rev. 1.8 02/04/03
www.irf.com
3
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