S1212B Datasheet, PDF (12/58 Pages) Seiko Instruments Inc – HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR

HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1212B/D Series
Rev.3.0_00
 Standard Circuit
Input
C_IN^*1
VIN
VOUT
ON / OFF
VSS
Output
C_L^*2
Single GND
GND
*1. C_IN is a capacitor for stabilizing the input.
*2. C_L is a capacitor for stabilizing the output.
Figure 14
Caution The above connection diagram and constants will not guarantee successful operation. Perform
thorough evaluation using an actual application to set the constants.
 Condition of Application
Input capacitor (C_IN): A ceramic capacitor with capacitance of 1.0 μF or more is recommended.
Output capacitor (C_L): A ceramic capacitor with capacitance of 1.0 μF to 100 μF is recommended.
Caution Generally, in a voltage regulator, an oscillation may occur depending on the selection of the external
parts. Perform thorough evaluation including the temperature characteristics with an actual
application using the above capacitors to confirm no oscillation occurs.
 Selection of Input Capacitor (C_IN) and Output Capacitor (C_L)
The S-1212B/D Series requires C_L between the VOUT pin and the VSS pin for phase compensation. The operation is
stabilized by a ceramic capacitor with capacitance of 1.0 μF to 100 μF. When using an OS capacitor, a tantalum
capacitor or an aluminum electrolytic capacitor, the capacitance also must be 1.0 μF to 100 μF. However, an oscillation
may occur depending on the equivalent series resistance (ESR).
Moreover, the S-1212B/D Series requires C_IN between the VIN pin and the VSS pin for a stable operation.
Generally, an oscillaiton may occur when a voltage regulator is used under the conditon that the impedance of the power
supply is high.
Note that the output voltage transient characteristics varies depending on the capacitance of C_IN and C_L and the value of
ESR.
Caution Perform thorough evaluation including the temperature characteristics with an actual application to
select C_IN and C_L.
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