S1112 Datasheet, PDF (16/30 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION AND LOW DROPOUT

HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
 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 (C_L) and a capacitor
for stabilizing the input between the VIN pin and the VSS pin (C_IN), 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
(1.0 mA or less).
• Generally a series regulator may cause oscillation, depending on the selection of external parts. The
following conditions are recommended for the S-1112/1122 Series. However, be sure to perform
sufficient evaluation under the actual usage conditions for selection, including evaluation of temperature
characteristics.
Input capacitor (C_IN):
1.0 μF or more
Output capacitor (C_L):
0.47 μF or more
Equivalent series resistance (ESR): 10 Ω or less
• 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 power-on with the actual
device.
• The application conditions for the input voltage, the output voltage, and the load current should not
exceed the package 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 *5 of the table.
• SII 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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Seiko Instruments Inc.