S-882130AMH-M2FTFG(Rev3_1) 查看數據表（PDF） - Seiko Instruments Inc

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S-882130AMH-M2FTFG
(Rev.:Rev3_1)

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

Seiko Instruments Inc 

Rev.3.1_00

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

S-8821 Series

2. Step-up Charge Pump

The step-up charge pump steps up 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 stepped up to a constant voltage value by repeating this charge cycle and

discharge cycle.

Figure 7 shows the charge cycle, and Figure 8 shows the discharge cycle.

SW2: ON

SW1: OFF

VIN

Current flow

CPUMP

0.10 μF

COUT

10 μF

SW 4: ON

SW 3: OFF

Figure 7

SW 2: OFF

SW1: ON

VIN

CPUMP

0.10 μF

SW4: OFF

Current flow

COUT

10 μF

SW3: ON

Figure 8

Seiko Instruments Inc.

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