US1205
300 mA LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
PRELIMINARY DATASHEET
FEATURES
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
DESCRIPTION
The US1205 device is an efficient linear voltage regula-
tor 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.
APPLICATIONS
Laptop, Notebook & Palmtop computers
Battery powered Equipments
PCMCIA Vcc & Vpp regulator
Concumer Electronics
High Efficiency Linear Power Supplies
TYPICAL APPLICATION
Vin
C1
2.2uF
1
Vin
2
Gnd
Vout
5
R1
C2
2.2uF
Vout
Vo=1.242
X
(1+R1/R2)
R2
S.D.
Enable
3
En
Adj
4
1205app1-1.1
Typical application of the US1205 ajustable.
3.3V
C1
2.2uF
1
Vin
2
Gnd
3
En
Vout
5
C2
2.2uF
2.5V
S.D.
Enable
Byp
4
C3
1000pF
1205app2-1.2
Typical application of the US1205 Fixed voltage.
PACKAGE ORDER INFORMATION
Tj (°C)
0 TO 125
0 TO 125
0 TO 125
0 TO 125
0 TO 125
Rev. 1.4
9/25/00
5 LEAD
SOT 23
US1205CL
US1205-25CL
US1205-30CL
US1205-33CL
US1205-36CL
SOT23
Marking
AT00
AT25
AT30
AT33
AT36
Output
Voltage
Adj
2.5 V
3.0 V
3.3 V
3.6 V
2-1
UNISEM [ UNISEM ]
