Document Number: 002-08534 Rev. *D

Page

10 of 19

S6BP203A

7.2

Protection Function Table

The following table shows the state of each pin when each protection function operates.

Table 7-1 Protection Function Table

Function

ENA Pin

Setting

PG Pin

Output

DC/DC

Converter

Operation

Remarks

Shutdown operation

L

Hi-Z (*1)

Shutdown

It is recommended to connect PG pin to VOUT pin via a

pull-up resistor.

When setting ENA pin to a low level, VOUT pin voltage

drops to 0V. Therefore, PG pin outputs 0V.

Nominal operation

H

Hi-Z (*1)

Switching

−

Input under voltage protection

(Input UVLO)

H

L

Shutdown

After releasing UVLO state, this IC is automatically reset

with soft start.

Output under voltage protection

(Output UVP)

H

L

Switching

−

Output over voltage protection

(Output OVP)

H

L

Shutdown

−

Output over current protection

(Output OCP)

H

L

Switching

OCP operates to drop the output voltage.

Thermal shutdown

(TSD)

H

L

Shutdown

After releasing TSD state, this IC is automatically reset with

soft start.

*1: PG pin is formed as an open drain structure. The internal MOSFET is in the OFF state.