FOR AUTOMOTIVE HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT 105

°C OPERATION CMOS VOLTAGE REGULATOR

S-19200 Series

Seiko Instruments Inc.

13

5. Thermal shutdown circuit

The S-19200 Series has a thermal shutdown circuit to protect the device from damage due to overheat. When the

junction temperature rises to 150

°C typ., the thermal shutdown circuit operates to stop regulating. When the

junction temperature drops to 125

°C typ., the thermal shutdown circuit is released to restart regulating.

Due to self-heating of the S-19200 Series, if the thermal shutdown circuit starts operating, it stops regulating so that

the output voltage drops. When regulation stops, the S-19200 Series does not itself generate heat and the IC's

temperature drops. When the temperature drops, the thermal shutdown circuit is released to restart regulating, thus

this IC generates heat again. Repeating this procedure makes the waveform of the output voltage into a pulse-like

form. Stop or restart of regulation continues unless decreasing either or both of the input voltage and the output

current in order to reduce the internal power consumption, or decreasing the ambient temperature.

Table 9

Thermal Shutdown Circuit

VOUT Pin Voltage

Operate: 150

°C typ.

*1

Release: 125

°C typ.

*1

Set value

*1. Junction temperature