ST1L05 STMicroelectronics, ST1L05 Datasheet - Page 15

• Manufacturer Part Number: ST1L05
• Description: Very low quiescent BiCMOS voltage regulator
• Manufacturer: STMicroelectronics

Specifications of ST1L05

• Fixed Output Voltage: 1.8 V, 2.5 V, 3.3 V and ADJ
• Output Voltage Tolerance: ± 2% at 25 °C
• Output Current Capability: 1.3 A
• Very Low Quiescent Current: max 650 μA over temperature range
• Operating Junction Temperature Range: from 0 to 125 °C

ST1L05, ST1L05A, ST1L05B, ST1L05C, ST1L05D
Figure 26. Application schematic for the ST1L05B and ST1L05D
Figure 27. Application schematic for the ST1L05C
For the adjustable version, the output voltage can be adjusted from 1.22 V up to the input
voltage, minus the voltage drop across the PMOS (dropout voltage), by connecting a
resistor divider between the ADJ pin and the output, thus allowing remote voltage sensing.
The resistor divider should be selected using the following equation:
V
It is recommended to use resistors with values in the range of 10 kΩ to 100 kΩ. Lower
values can also be suitable, but will increase current consumption.
V
V
O
IN
IN
= V
ADJ
C
C
C
C
V
V
I
I
I
I
OFF ON
OFF ON
I
I
(1 + R
OFF ON
OFF ON
1
/ R
2
) with V
V
V
EN
EN
IN
IN
GND
GND
EN
EN
V
V
I
I
GND
GND
ADJ
Doc ID 14492 Rev 2
ST1L05B
ST1L05B
ST1L05D
ST1L05D
ST1L05C
ST1L05C
GND
GND
GND
GND
= 1.22 V (typ.)
V
V
O_SENSE
O_SENSE
ADJ
ADJ
V
V
V
V
OUT
OUT
PG
PG
O
O
R1
R1
R2
R2
C
C
Application information
O
O
V
V
O
O
C
C
O
O
V
V
OUT
OUT
15/24