S-19311BF2A-V5T2U4 Datasheet, PDF (20/39 Pages) Seiko Instruments Inc – CMOS VOLTAGE REGULATOR WITH RESET FUNCTION

FOR AUTOMOTIVE 125°C OPERATION HIGH-WITHSTAND VOLTAGE CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
S-19311 Series
Rev.1.0_02
 Precautions
• Wiring patterns for the VIN pin, the VOUT pin and GND should be designed so that the impedance is low. When
mounting an output capacitor between the VOUT pin and the VSS pin (CL) and a capacitor for stabilizing the input
between the VIN pin and the VSS pin (CIN), the distance from the capacitors to these pins should be as short as
possible.
• Note that generally the output voltage may increase when a series regulator is used at low load current (0.1 mA or
less).
• Note that generally the output voltage may increase due to the leakage current from an output transistor when a
series regulator is used at high temperature.
• Generally a series regulator may cause oscillation, depending on the selection of external parts. The following
conditions are recommended for the S-19311 Series. However, be sure to perform sufficient evaluation under the
actual usage conditions for selection, including evaluation of temperature characteristics. Refer to "3. Equivalent
series resistance vs. Output current characteristics (Ta = +25°C)" in " Reference Data" for the equivalent
series resistance (RESR) of the output capacitor.
Input capacitor (CIN):
Output capacitor (CL):
2.2 μF or more
2.2 μF or more
• In a series regulator, generally the values of overshoot and undershoot in the output voltage vary depending on the
variation factors of power-on, power supply fluctuation and load fluctuation, or output capacitance.
Determine the conditions of the output capacitor after sufficiently evaluating the temperature characteristics of
overshoot or undershoot in the output voltage with the actual device.
• The voltage regulator may oscillate when the impedance of the power supply is high and the input capacitance is
small or an input capacitor is not connected.
• Overshoot may occur in the output voltage momentarily if the voltage is rapidly raised at power-on or when the power
supply fluctuates. Sufficiently evaluate the output voltage at that time with the actual device.
• If the VOUT pin is steeply shorted with GND, a negative voltage exceeding the absolute maximum ratings may occur
to the VOUT pin due to resonance of the wiring inductance and the output capacitance in the application. The
negative voltage can be limited by inserting a protection diode between the VOUT pin and the VSS pin or inserting a
series resistor to the output capacitor.
• The application conditions for the input voltage, the output voltage, and the load current should not exceed the power
dissipation.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
• In determining the output current, attention should be paid to the output current value specified in Table 7 in
" Electrical Characteristics" and footnote *4 of the table.
• SII Semiconductor Corporation claims no responsibility for any disputes arising out of or in connection with any
infringement by products including this IC of patents owned by a third party.
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