UNISEM US1205-36CL, US1205-33CL, US1205-30CL, US1205-25CL, US1205CL Datasheet
US1205
300 mA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
PRELIMINARY DATASHEET
FEATURESFEATURES
SOT23 package
Stable with 2.2uF ceramic capacitor
1% Voltage Reference Accuracy
Only 270mV Dropout at 300 mA
170mV Dropout at 150mA
10nA Quiescent Current in Shutdown
Current Limit and Thermal Shutdown
Logic input Enable pin
APPLICATIONSAPPLICATIONS
Laptop, Notebook & Palmtop computers
Battery powered Equipments
PCMCIA Vcc & Vpp regulator
Concumer Electronics
High Efficiency Linear Power Supplies
TYPICAL APPLICATIONTYPICAL APPLICATION
Vin Vout
C1
2.2uF
S.D.
Enable
Vin
1
Gnd
2
En
3 4
Vout
Adj
DESCRIPTIONDESCRIPTION
The US1205 device is an efficient linear voltage regulator with better than 1% initial voltage accuracy, very low
dropout voltage and very low ground current designed
especially for hand held, battery powered applications.
Other features of the device are; TTL compatible enable/
shutdown control input, current limiting and thermal
shutdown.
The US1205 is available in fixed and adjustable output
voltage versions in a small SOT23-5 package.
5
R1
Vo=1.242 X (1+R1/R2)
C2
R2
2.2uF
1205app1-1.1
Typical application of the US1205 ajustable.
3.3V 2.5V
C1
2.2uF
S.D. Enable
Vin
1
Gnd
2
En
3 4
Vout
Byp
5
C2
2.2uF
1205app2-1.2
C3
1000pF
Typical application of the US1205 Fixed voltage.
PACKAGE ORDER INFORMATIONPACKAGE ORDER INFORMATION
Tj (°C) 5 LEAD SOT23 Output
SOT 23 Marking Voltage
0 TO 125 US1205CL AT00 Adj
0 TO 125 US1205-25CL AT25 2.5 V
0 TO 125 US1205-30CL AT30 3.0 V
0 TO 125 US1205-33CL AT33 3.3 V
0 TO 125 US1205-36CL AT36 3.6 V
Rev. 1.4
9/25/00
2-1
US1205
ABSOLUTE MAXIMUM RATINGSABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) ............................................................. 10V
Enable Input Voltage ........................................................... 10V
Storage Temperature Range ................................ -65°C TO 150°C
Operating Junction Temperature Range ...................... 0°C TO 150°C
PACKAGE INFORMATIONPACKAGE INFORMATION
5 PIN SOT23 ( L ) Adjustable 5 PIN SOT23 ( L ) Fixed
En
En
Gnd Vin
3 2 1
Gnd Vin
3 2 1
AT00
4 5
Adj
Vout
θJA=220°C/W
ATxx
4 5
Byp
Vout
θJA=220°C/W
ELECTRICAL SPECIFICATIONSELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over ,Cin=Co=22uF, Io=100uA, Vinmin=2.5V(Adjustable
devices) Vin=Vo+1V(for fixed voltage devices), Vout=Vfb (for adjustable version only), Cbyp=470pF(for fixed output
versions only), Venb=2V and Ta=25°C. Typical values refer to Ta=25 °C.Low duty cycle pulse testing are used
which keeps junction and case temperatures equal to the ambient temperature.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage Vo -1 1 %
See Table 1 for typical values (Note 4) -2 2
Line Regulation dVi Vo+1V<Vin<10 0.005 %/V
Load Regulation (note 1) dVL 1mA<Io<100mA 0.8 %
100mA<Io<300mA 0.1 %
Dropout Voltage (note 2) dVio Io=100uA 10 50 mV
Io=100uA (Note 4) 13 70 mV
Io=50mA 85 110 mV
Io=50mA (Note 4) 100 140 mV
Io=150mA 170 220 mV
Io=150mA (Note 4) 204 260 mV
Io=300mA 270 350 mV
Io=300mA (Note 4) 324 400 mV
Ground Current (Note 3) Iq Ven=2V, Io=100uA 120 160 uA
Io=100uA (Note 4) 240 uA
Io=50mA 420 600 uA
Io=50mA (Note 4) 540 uA
Io=150mA 2200 2900 uA
Io=150mA (Note 4) 2900 uA
Io=300mA 7200 9500 uA
Io=300mA (Note 4) 9300 uA
Ground Current-S.D Activated Iqsd S.D pin<0.1V 0.1 uA
S.D pin=0.8V 8
Current Limit Icl Vo=0V 320 420 mA
Thermal Regulation dVp Vin=10V, Io=150mA,10 mS PULSE 0.05 %/W
Adjust Pin Current Iadj Vin=2.5V,Vo=Vadj 0.1 uA
Enable pin input LO voltage Venl Regulator OFF 0.8 V
Enable pin input HI voltage Venh Regulator ON 2 V
Enable pin input LO current Venl=0V to 0.8V 0.01 uA
Enable pin input HI current Venh=2V to Vin 20 uA
2-2
Rev. 1.4
9/25/00
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