S-8821 Seiko Instruments, S-8821 Datasheet - Page 12

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

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12
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Precautions
• Regarding the wiring to the VIN pin, VOUT pin, C+ pin, C− pin and GND pin, be careful to perform
• Always connect a capacitor to the VOUT pin, C+ pin, and C− pin.
• Connect C
• Connect C
• The ON/OFF pin is configured as shown in Figure 9 and is neither pulled up or down internally, so do not
• Since this IC consists of double step-up circuits, it cannot set more than twice voltage of V
• Be careful about the usage conditions for the input/output voltages and output current to make sure that
• Since the information described herein is subject to change without notice, confirm that this is the latest
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in
• SII claims no responsibility for any and all disputes arising out of or in connection with any infringement
pattern wiring so as to obtain low impedance.
pin in order to lower the impedance of the wiring resistance, etc. High impedance may cause unstable
operation.
Moreover, in selecting C
order to lower the impedance of the wiring resistance, etc. High impedance may cause instable
operation.
Moreover, in selecting C
use this pin in a floating state. When not using the ON/OFF pin, connect it to the VIN pin.
Moreover, please do not apply voltage higher than VIN + 0.3 V to an ON/OFF pin. Current flows for a
VIN pin through the protection diode inside IC.
dissipation within the IC does not exceed the allowable power dissipation of the package.
For reference, the calculation of the power consumption in this IC is shown below.
one before using.
electrostatic protection circuit.
of the products including this IC upon patents owned by a third party.
P
Reference: V
D
=(V
IN
IN
PUMP
× 2.0 − V
and C
in the vicinity of the IC and sufficiently strengthen the wiring for the C+ pin and C− pin in
P
IN
D
OUT
=(4.2 × 2.0 − 5.5) × 0.010=29 mW
=4.2 V, V
OUT
in the vicinity of the IC and sufficiently strengthen the wiring for GND pin and VIN
) × (I
IN
PUMP
and C
, perform a full evaluation of the actual usage conditions.
OUT
OUT
)
=5.5 V, I
OUT
, perform a full evaluation of the actual usage conditions.
Seiko Instruments Inc.
OUT
=10 mA
IN
to V
Rev.3.1
OUT(S)
.
_00
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