DROPOUT POSITIVE FIXED 3.3V OUTPUT REGULATOR FEATURES Guaranteed

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DROPOUT POSITIVE FIXED 3.3V OUTPUT REGULATOR FEATURES Guaranteed

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IRU1050-33
DROPOUT POSITIVE FIXED 3.3V OUTPUT REGULATOR FEATURES
Guaranteed 1.3V Dropout Full Load Current Fast Transient Response Voltage Reference Initial Accuracy Output Current Limiting Built-in Thermal Shutdown
IRU1050-33 dropout three-terminal fixed 3.3V output regulator with minimum output current capability. This product specifically designed provide well regulated supply voltage applications requiring 3.3V output. IRU1050-33 guaranteed have <1.3V dropout full load current making ideal provide well regulated output with supply voltage 4.6V input.
APPLICATIONS
Standard 3.3V Chipset Logic Applications
TYPICAL APPLICATION
330uF
IRU1050-33 Vout
3.3V
330uF
1050-33app1-1.1
Typical application IRU1050-33
(°C)
3-PIN PLASTIC T0-220 IRU1050-33CT
3-PIN PLASTIC TO-263 IRU1050-33CM
2-PIN PLASTIC
ULTRA THIN-PAK
IRU1050-33CP
3-PIN PLASTIC TO-252 IRU1050-33CD
Rev. 10/27/00
2-57
IRU1050-33
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) Power Dissipation Internally Limited Storage Temperature Range -65° 150° Operating Junction Temperature Range 150°
PACKAGE INFORMATION
3-PIN PLASTIC TO-220
FRONT VIEW
3-PIN PLASTIC TO-263
FRONT VIEW
2-PIN PLASTIC ULTRA THIN-PAK
FRONT VIEW
3-PIN PLASTIC TO-252
FRONT VIEW
Vout
Vout
Vout
Vout
Vout
Vout
JT=2.7°C/W JA=60°C/W
JA=35°C/W Square
JA=70°C/W Square
JA=70°C/W 0.5"
ELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over, Cin=1µF, Cout =10µF, Tj=0 150° Typical values refer Tj=25° PARAMETER Output Voltage Line Regulation Load Regulation (note Dropout Voltage (note Current Limit Minimum Load Current (note Thermal Regulation Ripple Rejection Adjust Current Change Temperature Stability Long Term Stability Output Noise Pulse, Vin-Vo=3V, Io=5A f=120HZ, Co=25µF Io=2.5A, Vin-Vo=3V Io=10mA,Vin-Vo=1.5V, Tj=25 Vin=5V, Vadj=0V, Io=10mA Tj=125° 1000 Tj=25° 10hz<f<10khz 0.003 0.01 0.02 Note Io=5A Vin=5V, dVo=100mV Vin=5V TEST CONDITION Io=10mA,Tj=25° C,Vin=5V Io=10mA, Vin=5V Io=10mA, 4.7V<Vin<7V Vin=5V, Vadj=0, 10mA<Io<5A 3.267 3.300 3.234 3.300 3.330 3.366 UNITS
Note duty cycle pulse testing with Kelvin connections required order maintain accurate data. Note Dropout voltage defined minimum differential voltage between required maintain regulation Vout measured when output voltage drops below nominal value.
Note Minimum load current defined minimum current required output order output voltage maintain regulation. Typically resistor dividers selected such that automatically maintains this current.
2-58
Rev. 10/27/00
IRU1050-33
DESCRIPTIONS
SYMBOL Vout DESCRIPTION This must connected plane using inductance short connection. output regulator. minimum 10µF capacitor must connected from this ground insure stability. input regulator. Typically large storage capacitor connected from this ground insure that input voltage does below minimum dropout voltage during load transient response. This must always 1.3V higher than Vout order device regulate properly.
BLOCK DIAGRAM
Vout
1504
1.25V CURRENT LIMIT
THERMAL SHUTDOWN
1050-33blk1-1.0
Figure Simplified block diagram IRU1050-33
APPLICATION INFORMATION
Stability IRU1050-33 requires output capacitor part frequency compensation order make regulator stable. Typical designs microprocessor applications standard electrolytic capacitors with typical range 100m output capacitance 1000µF. Fortunately capacitance increases, decreases resulting fixed time constant. IRU1050-33 takes advantage this phenomena making overall regulator loop stable. most applications minimum 100µF aluminum electrolytic capacitor such Sanyo MVGX series, Panasonic series well Nichicon series insures both stability good transient response.
Rev. 10/27/00
2-59
IRU1050-33
Notes
2-60
Rev. 10/27/00

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