S-8821 Seiko Instruments, S-8821 Datasheet - Page 9

• 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
2. Step-up Charge Pump
transistors.
SW4 to ON (charge cycle). Following charging the electricity, in order to discharge the charged
electricity to the output capacitance (C
and SW4 to OFF (discharge cycle).
discharge cycle.
The step-up charge pump steps up the voltage by switching ON/OFF of the SW1 to SW4 switching
First, in order to charge the pump capacitance (C
The input voltage can be stepped up to a constant voltage value by repeating this charge cycle and
Figure 7 shows the charge cycle, and Figure 8 shows the discharge cycle.
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VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
V
IN
Current flow
Seiko Instruments Inc.
V
OUT
IN
SW 4: OFF
SW 2: OFF
SW 4: ON
SW 2: ON
), SW1 set the switches as to ON, SW2 to OFF, SW3 to ON,
C
0.10 μF
PUMP
Figure 7
Figure 8
PUMP
), set SW1 to OFF, SW2 to ON, SW3 to OFF, and
C
0.10 μF
PUMP
SW 3: OFF
SW 1: OFF
Current flow
SW 1: ON
SW 3: ON
C
10 μF
C
10 μF
OUT
OUT
S-8821 Series
9
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