S-1312XXXH Datasheet, PDF (20/38 Pages) ABLIC Inc. – 105°C OPERATION, 5.5 V INPUT, 150 mA VOLTAGE REGULATOR

105°C OPERATION LOW CURRENT CONSUMPTION HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1312xxxH Series
Rev.1.1_01
6. Overcurrent protection circuit
The S-1312xxxH Series includes an overcurrent protection circuit having the characteristics shown in "1. Output
voltage vs. Output current (When load current increases) (Ta = +25°C)" in " Characteristics (Typical Data)", in
order to protect the output transistor against an excessive output current and short circuiting between the VOUT pin
and the VSS pin. The current when the output pin is short-circuited (Ishort) is internally set at approx. 50 mA typ., and
the normal value is restored for the output voltage, if releasing a short circuit once.
Caution This overcurrent protection circuit does not work as for thermal protection. If this IC long keeps
short circuiting inside, pay attention to the conditions of input voltage and load current so that,
under the usage conditions including short circuit, the loss of the IC will not exceed power
dissipation.
7. Thermal shutdown circuit
The S-1312xxxH 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 120°C typ., the thermal shutdown circuit is released to restart regulating.
Due to self-heating of the S-1312xxxH Series, if the thermal shutdown circuit starts operating, it stops regulating so
that the output voltage drops. When regulation stops, the S-1312xxxH 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 the S-1312xxxH Series 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 13
Thermal Shutdown Circuit
VOUT Pin Voltage
Operate: 150°C typ.^*1
Release: 120°C typ.^*1
VSS level
Set value
*1. Junction temperature
20