S-8821 Ver la hoja de datos (PDF) - Unspecified
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S-8821 Datasheet PDF : 24 Pages
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VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Rev.5.1_03
2. Boost Charge Pump
The boost charge pump boosts the voltage by switching ON/OFF of the SW1 to SW4 switching
transistors.
First, in order to charge the pump capacitance (CPUMP), set SW1 to OFF, SW2 to ON, SW3 to OFF, and
SW4 to ON (charge cycle). Following charging the electricity, in order to discharge the charged
electricity to the output capacitance (COUT), SW1 set the switches as to ON, SW2 to OFF, SW3 to ON,
and SW4 to OFF (discharge cycle).
The input voltage can be boosted to a constant voltage value by repeating this charge cycle and
discharge cycle.
Figure 8 shows the charge cycle, and Figure 9 shows the discharge cycle.
SW2: ON
SW1: OFF
VIN
Current flow
CPUMP
0.10 F
COUT
10 F
SW 4: ON
SW 3: OFF
Figure 8
SW 2: OFF
SW1: ON
VIN
CPUMP
0.10 F
SW4: OFF
Current flow
COUT
10 F
SW3: ON
Figure 9
10
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