S-19500A03A-E8T1U4 Datasheet, PDF (19/52 Pages) Seiko Instruments Inc – CMOS VOLTAGE REGULATOR WITH WATCHDOG TIMER AND RESET FUNCTION

FOR AUTOMOTIVE 125°C OPERATION HIGH-WITHSTAND VOLTAGE CMOS VOLTAGE REGULATOR WITH WATCHDOG TIMER AND RESET FUNCTION
Rev.1.2_01
S-19500/19501 Series
 Condition of Application
Input capacitor (CIN)
Output capacitor (CL)
ESR of output capacitor
Delay time adjustment capacitor (CDLY)
Watchdog activation threshold current adjustment resistor (RWADJ,ext)
External pull-up resistors (RextR, RextW)
: 2.2 μF or more
: 2.2 μF or more
: 10 Ω or less
: 1.0 nF or more
: 10 kΩ or more
: 3 kΩ or more
Caution Generally a series regulator may cause oscillation, depending on the selection of external parts.
Confirm that no oscillation occurs in the application for which the above capacitors are used.
 Selection of Input and Output Capacitors (CIN, CL)
The S-19500/19501 Series requires CL between the VOUT pin and the VSS pin for phase compensation. Operation is
stabilized by a ceramic capacitor with an output capacitance of 2.2 μF or more over the entire temperature range.
When using an OS capacitor, a tantalum capacitor, or an aluminum electrolytic capacitor, the capacitance must be
2.2 μF or more, and the ESR must be 10 Ω or less.
The values of output overshoot and undershoot, which are transient response characteristics, vary depending on the
value of the output capacitor.
The required value of capacitance for the input capacitor differs depending on the application.
Caution Define the capacitance of CIN and CL by sufficient evaluation including the temperature
characteristics under the actual usage conditions.
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