S-1132 Datasheet, PDF (15/35 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR

HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.2_00
S-1132 Series
„ Precautions
• Wiring patterns for the VIN, VOUT and GND pins should be designed so that the impedance is low. When mounting
an output capacitor between the VOUT and VSS pins (C_L) and a capacitor for stabilizing the input between VIN and
VSS pins (C_IN), the distance from the capacitors to these pins should be as short as possible.
• Note that the output voltage may increase when a series regulator is used at low load current (1.0 mA or less).
• Note that the output voltage may increase due to driver leakage when a series regulator is used at high
temperatures.
• Generally a series regulator may cause oscillation, depending on the selection of external parts. The following
conditions are recommended for this IC. However, be sure to perform sufficient evaluation under the actual usage
conditions for selection, including evaluation of temperature characteristics.
Input capacitor (C_IN):
Output capacitor (C_L):
Equivalent series resistance (ESR):
0.1 µF or more
0.1 µF or more
2.0 Ω or less
• The voltage regulator may oscillate when the impedance of the power supply is high and the input capacitor is small
or an input capacitor is not connected.
• If the capacitance of the IC’s output block is small, the power supply fluctuation and load fluctuation characteristics
become worse. It is therefore important to sufficiently evaluate the output voltage fluctuation in the actual
equipment.
• When the capacitance of the IC’s output block is small, if the power supply suddenly increases sharply, a
momentary overshoot may be output. It is therefore important to sufficiently evaluate the output voltage at power
application in the actual equipment.
• The application conditions for the input voltage, output voltage, and 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 6 in the
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.
Seiko Instruments Inc.
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