S-8821 Seiko Instruments, S-8821 Datasheet - Page 11

• Manufacturer Part Number: S-8821
• Description: VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
• Manufacturer: Seiko Instruments

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Rev.3.1
External Capacitor Selection
1. Input and Output Capacitors (C
2. Pump Capacitor (C
capacitor with a small equivalent series resistance (ESR). Although this figure varies according to the
impedance of the power supply that is used as well as the load current value, it is generally in the range
of 4.7 μF to 10 μF.
voltage. A value of 10 μF is recommended for the capacitance value. Use of a capacitor with a
capacitance lower than 10 μF results in a larger ripple voltage. Conversely, use of a capacitor with a
capacitance greater than 10 μF results in the output voltage not being able to rise up to setting value
and the impossibility to obtain the desired output current.
The pump capacitor (C
small ESR. A capacitance value of 0.10 μF is recommended. Use of a capacitor with a capacitance
greater than 0.10 μF results in a larger ripple voltage. Conversely, use of a capacitor with a capacitance
lower than 0.10 μF results in the output voltage not being able to raise up to setting value and the
impossibility to obtain the desired output current.
The input capacitor (C
The C
For the output capacitor (C
_00
IN
value is selected according to the impedance of the power supply that is used. Select a ceramic
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
PUMP
IN
PUMP
)
) lowers the power supply impedance and averages the input current.
OUT
) is required for stepping up the voltage. Select a ceramic capacitor with a
), select a ceramic capacitor with a small ESR for smoothing the ripple
IN
, C
OUT
Seiko Instruments Inc.
)
S-8821 Series
11
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