DROPOUT POSITIVE ADJUSTABLE REGULATOR SOT-23 Package Stable with
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IRU1205
DROPOUT POSITIVE ADJUSTABLE REGULATOR
SOT-23 Package Stable with 2.2µF Ceramic Capacitor Voltage Reference Accuracy Only 270mV Dropout 300mA 170mV Dropout 150mA 10nA Quiescent Current Shutdown Current Limit Thermal Shutdown Logic input Enable
DESCRIPTION
IRU1205 device efficient linear voltage regulator with better than initial voltage accuracy, very dropout voltage very ground current designed especially hand held, battery powered applications. Other features device are: compatible enable/ shutdown control input, current limiting thermal shutdown. IRU1205 available fixed adjustable output voltage versions small SOT23-5 package.
APPLICATIONS
Laptop, Notebook Palmtop computers Battery powered Equipments PCMCIA regulator Concumer Electronics High Efficiency Linear Power Supplies
TYPICAL APPLICATION
2.2uF
Vout
2.2uF
Vout
Vo=1.242 (1+R1/R2)
S.D. Enable
1205app1-1.1
Typical application IRU1205 ajustable
3.3V
2.2uF
Vout
2.5V
2.2uF
S.D.
Enable
1000pF
1205app2-1.2
Typical application IRU1205 Fixed voltage
PACKAGE ORDER INFORMATION
(°C)
Rev. 9/25/00
5-LEAD SOT-23 IRU1205CL IRU1205-25CL IRU1205-30CL IRU1205-33CL IRU1205-36CL
SOT-23 MARKING AT00 AT25 AT30 AT33 AT36
OUTPUT VOLTAGE
2-91
IRU1205
ABSOLUTE MAXIMUM RATINGS
Input Voltage Enable Input Voltage Storage Temperature Range Operating Junction Temperature Range -65°C 150°C 150°C
PACKAGE INFORMATION
5-PIN SOT-23 Adjustable
5-PIN SOT-23 Fixed
AT00
JA=220°C/W
ATxx
Vout
JA=220°C/W
Vout
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over, Cin=Co=22µ, Io=100µA, Vinmin=2.5V(Adjustable devices) in=Vo+1V(for fixed voltage devices), =Vfb (for adjustable version only), Cbyp=470pF(for fixed output versions only), Venb=2V Ta=25°C. Typical values refer Ta=25°C. duty cycle pulse testing used which keeps junction case temperatures equal ambient temperature. PARAMETER TEST CONDITION UNITS Reference Voltage Table typical values (Note Line Regulation Vo+1V<Vin<10 0.005 Load Regulation (note 1mA<Io<100mA 100mA<Io<300mA Dropout Voltage (note dVio Io=100µA Io=100µA (Note Io=50mA Io=50mA (Note Io=150mA Io=150mA (Note Io=300mA Io=300mA (Note Ground Current (Note Ven=2V, Io=100µA Io=100µA (Note Io=50mA Io=50mA (Note Io=150mA 2200 2900 Io=150mA (Note 2900 Io=300mA 7200 9500 Io=300mA (Note 9300 Ground Current-S.D Activated Iqsd pin<0.1V pin=0.8V Current Limit Vo=0V Thermal Regulation Vin=10V, Io=150mA,10mS Pulse 0.05 Adjust Current Iadj Vin=2.5V, Vo=Vadj Enable input voltage Venl Regulator Enable input voltage Venh Regulator Enable input current Venl=0V 0.8V 0.01 Enable input current Venh=2V
2-92
Rev. 9/25/00
IRU1205
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 (Adjustable only) (Fixed output only) Vout DESCRIPTION resistor divider from this Vout ground sets output voltage. 1000pF bypass capacitor connected this reduces output noise. output regulator. minimum 2.2µF with capacitor must connected from this ground insure stability. 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 minimumdrop voltage during load transient response. This must always higher than Vout least amount dropout voltage some margin order device regulate properly.
5-LEAD SOT-23 IRU1205 IRU1205-25 IRU1205-30 IRU1205-33 IRU1205-36
Output Voltage 1.242V
output voltage adjustable device using: Vo=1.242 (1+R1/R2) Where; R1=Resistor connected from output R2=Resistor connected from
Table Nominal output voltage part number
BLOCK DIAGRAM
Vout Vout
THERMAL SHUTDOWN
1.242V
1.242V
THERMAL SHUTDOWN
1205blk1-1.1
1205blk2-1.0
Figure IRU1205 Adjustable block diagram
Rev. 9/25/00
Figure IRU1205 Fixed output block diagram
2-93
IRU1205
Notes
2-94
Rev. 9/25/00
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