S-8821 Seiko Instruments, S-8821 Datasheet - Page 14

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

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14
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
(4) Ripple voltage vs. Operation input voltage
S-882133A
(5) Efficiency
S-882133A
*1. The ideal efficiency is indicated by the following expression.
(6) Maximum oscillation frequency vs. Operation input voltage
S-882133A
1300
1200
1000
1100
100
100
900
800
700
80
60
40
20
80
60
40
20
0
Efficiency (η)=(V
1.5
1.5 2.0
1.5 2.0
2.0
*1
vs. Operation input voltage
2.5
2.5
2.5
3.0
3.0
3.0
OUT
V
V
V
3.5
IN
IN
3.5
3.5
IN
[V]
[V]
× I
[V]
I
I
OUT
OUT
4.0
OUT
4.0
4.0
=10 mA, Ta=25°C
=10 mA, Ta=25°C
) / (2.0 × V
4.5
4.5
4.5
Ta=25°C
5.0
5.0
5.0 5.5
Seiko Instruments Inc.
IN
5.5
5.5
× I
OUT
)
S-882150A
S-882150A
S-882150A
100
1300
1200
1000
1100
100
80
60
40
20
900
800
700
80
60
40
20
0
1.5
1.5
1.5 2.0
2.0
2.0
2.5
2.5
2.5
3.0
3.0
3.0
V
V
V
3.5
3.5
IN
IN
IN
3.5
[V]
[V]
[V]
I
I
OUT
OUT
4.0
4.0
4.0
=10 mA, Ta=25°C
=10 mA, Ta=25°C
4.5
4.5
4.5
Ta=25°C
5.0
5.0
5.0 5.5
Rev.3.1
5.5
5.5
_00
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