VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER

S-8821 Series

11

3. Shutdown Pin (ON/OFF Pin)

Setting the ON/OFF pin to the Low level ("L") causes the voltage of the VOUT pin to change to the GND

level and simultaneously the operation of all the internal circuit to stop. At this time, the consumption

current is largely reduced, to a level of approximately 0.3

μA.

The structure of the ON/OFF pin is as shown in Figure 10. Since the ON/OFF pin is neither pulled

down nor pulled up internally, do not use it in the floating state.

When the ON/OFF pin is not used, connect it to the VIN pin.

Table 6

ON/OFF pin

Internal circuit

VOUT pin voltage

“H”: Power on

Operating

Set value

“L”: Power off

Stop

GND

ON/OFF

VIN

VIN

Figure 10

4. Soft Start Function

The S-8821 Series features a built-in soft start circuit. Upon power application or when the

OFF

ON/

pin

is switched from "L" to "H", the output voltage gradually rises over the soft start time, and the output

current is gradually output as a result. This soft start function reduces the input current rush.