VERY DROPOUT POSITIVE ADJUSTABLE FIXED REGULATOR FEATURES Dropout

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VERY DROPOUT POSITIVE ADJUSTABLE FIXED REGULATOR FEATURES Dropout

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IRU1206/IRU1207/IRU1208/IRU1209
VERY DROPOUT POSITIVE ADJUSTABLE FIXED REGULATOR FEATURES
Dropout Voltage (500mV Voltage Reference Accuracy Ground Current 10uA Quiescent Current Shutdown (IRU1207, 1208) Fast Transient Response Current Limit Thermal Shutdown Error Flag Signal Output Regulation (IRU1207, 1208) Compatible with MIC39100/101/102 series
IRU1206 family devices ultra dropout regulators using transistor pass element. These products ideal when single input supply available only dropout voltage less than exceeding minimum dropout characteristics NPN/ hybrid regulators. common application these regulators where input 3.3V 2.5V output needed. Besides dropout less than 0.5V, other features family parts are: micropower shutdown capability output UVLO detection where Flag switched when output below nominal point. IRU1206-XX SOT-223 compatible with MIC39100-XX, IRU1207 IRU1209 SO-8 power package compatible with MIC39101 39102 respectively.
APPLICATIONS
2.5V Supply from 3.3V Input generation Logic Computer Mother Board, Add-on Cards High Efficiency Post Regulator SMPS
TYPICAL APPLICATION
Vout
Vout
IRU1206XX
1206app2-1.0
PACKAGE ORDER INFORMATION
(°C)
Rev. 12/22/00
3-LEAD 3-LEAD D-PAK SOT-223 IRU1206-18CD IRU1206-18CY IRU1206-25CD IRU1206-25CY IRU1206-33CD IRU1206-33CY
8-PIN PLASTIC SOIC Power IRU1207-18CS IRU1207-25CS IRU1207-33CS IRU1208CS IRU1209CS
Voltage 1.8V 2.5V 3.3V 1.8V 2.5V 3.3V
Functions Vin, Vout, Vin, Vout, Vin, Vout, Vin, Vout, GND, Enable, Flag Vin, Vout, GND, Enable, Flag Vin, Vout, GND, Enable, Flag Vin, Vout, GND, Flag, Vin, Vout, GND, Adj, Enable
2-95
IRU1206/IRU1207/IRU1208/IRU1209
ABSOLUTE MAXIMUM RATINGS
Input Voltage Enable Input Voltage Storage Temperature Range Operating Junction Temperature Range -65°C 150°C 135°C
PACKAGE INFORMATION
8-PIN PLASTIC POWER SOIC IRU1207 IRU1208
VIEW VIEW
IRU1209
VIEW
Enable Vout Flag
Flag Vout
Enable Vout
JA=55°C/W
3-PIN PLASTIC TO-252 IRU1206
FRONT VIEW
3-PIN PLASTIC SOT-223 IRU1206 VIEW
Vout
Vout
JA=70°C/W 0.5"
JA=90°C/W 0.4"
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over, Cin=Cout =10µF, Vin=Vo+1V, =Vfb (for adjustable version only), Ta=25 Typical values refer Ta=25 duty cycle pulse testing used which keeps junction case temperatures equal ambient temperature. PARAMETER Initial Voltage Accuracy Table nominal values Line Regulation Load Regulation (note Output voltage Temp Coef. Dropout Voltage (note dVoT dVio Io=100mA (Note Io=500mA (Note Io=1000mA (Note Ground Current (Note Vin=Vo Io=100mA (Note Io=500mA (Note Io=1000mA (Note Current Limit Minimum Input Voltage IRU1208, 1209 Adjust Current Minimum Load Current Iadj Iomin Vin=2.5V,Vo=Vadj (Note Vinmin Vo=5% below regulation point TEST CONDITION Io=10mA, Ta=25°C (Note Vo+1V<Vin<12 10mA<Io<1A 1mA<Io<150mA -1.3 ppm/°C UNITS
2-96
Rev. 12/12/00
IRU1206/IRU1207/IRU1208/IRU1209
IRU1207, 1209 Ground Current-S.D Activated Enable input voltage Enable input voltage Enable input current Enable input current IRU1207, 1208 Flag Output Threshold Voltage Flag Output Hysterises Voltage Flag Output Saturation Voltage Iqsd Venl Venh TEST CONDITION Enable=0V Regulator (Note Regulator (Note Venl=0V 0.8V (Note Venh=2V (Note 0.01 UNITS
Vthfg Vhys Vfsat
Output Ramping Io=5mA Io=500µA
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 Ground current regulator quiescent current plus pass transistor current. total current from supply load current plus ground current. Note specification applies junction temperature +125°C.
DESCRIPTIONS
SYMBOL IRU1208, 1209 Flag IRU1208 Vout devices devices Enable IRU1207, 1209 devices DESCRIPTION resistor divider from this Vout ground sets output voltage. open collector output that switches when output voltage drops about below expected regulated voltage. output regulator. minimum 2.2µF capacitor must connected from this ground. Ground pin. This must connected lowest potential system other pins must higher potential with respect this pin. Enable pin. signal left open this shuts down output. This must tied normal operation. input regulator. Typically large storage capacitor connected from this ground insure that input voltage does below minimum drop voltage during load transient response. This must always 0.6V higher than Vout order device regulate properly. Table Output voltage part number Part Number Output Voltage IRU1206-18 1.8V IRU1206-25 2.5V IRU1206-33 3.3V IRU1207-18 1.8V IRU1207-25 2.5V IRU1207-33 3.3V IRU1208 1.24V IRU1209 1.24V
APPLICATION INFORMATION
Stability IRU120X series regulators require output capacitor part frequency compensation order make regulator stable. minimum 2.2µF capacitance range insures stability system.
Rev. 12/22/00
2-97
IRU1206/IRU1207/IRU1208/IRU1209
TYPICAL APPLICATION
Vout
Vout
IRU1206XX
1206app2-1.0
Note: must also connected ground.
Figure Typical application IRU1206
Desig
Description Capacitor Capacitor
Part 10µF, Tantalum 10µF, Tantalum
Manuf
2-98
Rev. 12/12/00
IRU1206/IRU1207/IRU1208/IRU1209
TYPICAL APPLICATION
Flag
Error Flag Vout
Vout
IRU1207
S.D.
1207app2-1.0
Enable
Enable
Figure Typical application IRU1207
Desig
Description Capacitor Capacitor Resistor
Part 10µF, Tantalum 10µF, Tantalum
Manuf Panasonic
Rev. 12/22/00
2-99
IRU1206/IRU1207/IRU1208/IRU1209
TYPICAL APPLICATION
Vout
Vout
1208app2-1.0
IRU1208
Flag
Error Flag
1.24 R1/R2)
Figure Typical application IRU1208 3.3V 2.5V regulator
Desig
Description Capacitor Capacitor Resistor Resistor Resistor
Part 10µF, Tantalum 10µF, Tantalum
Manuf
2-100
Rev. 12/12/00
IRU1206/IRU1207/IRU1208/IRU1209
TYPICAL APPLICATION
Vout
Vout
IRU1209
Enable
1209app2-1.0
S.D.
Enable
1.24 R1/R2)
Figure Typical application IRU1209 3.3V 2.5V regulator
Desig
Description Capacitor Capacitor Resistor Resistor
Part 10µF, Tantalum 10µF, Tantalum
Manuf
Rev. 12/22/00
2-101
IRU1206/IRU1207/IRU1208/IRU1209
Notes
2-102
Rev. 12/12/00

VERY DROPOUT POSITIVE ADJUSTABLE FIXED REGULATOR FEATURES Dropout

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