S-13D1 Datasheet, PDF (22/45 Pages) Seiko Instruments Inc – SUPER-SMALL PACKAGE 2-CIRCUIT BUILT-IN DELAY FUNCTION HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR

SUPER-SMALL PACKAGE 2-CIRCUIT BUILT-IN DELAY FUNCTION HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-13D1 Series
Rev.1.3_01
5. Constant current source pull-down (S-13D1 Series A / B / C type)
The ON / OFF pin is internally pulled down to the VSS pin in the floating status, so the VOUT pin is set to the VSS level.
Note that the IC's current consumption increases as much as current flows into the constant current of 0.3 μA typ.
when the ON / OFF pin is connected to the VIN pin and the S-13D1 Series A / B / C type is operating.
6. Overcurrent protection circuit
The S-13D1 Series includes an overcurrent protection circuit which has the characteristics shown in "1. Output
voltage vs. Output current (When load current increases) (Ta = +25°C)" in " Characteristics (Typical Data) (per
Circuit)", 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. 40 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 of the package.
7. Thermal shutdown circuit
The S-13D1 Series has a thermal shutdown circuit to protect the device from damage due to overheat. When the
junction temperature rises to 160°C typ., the thermal shutdown circuit operates to stop regulating. When the junction
temperature drops to 130°C typ., the thermal shutdown circuit is released to restart regulating.
Due to self-heating of the S-13D1 Series, if the thermal shutdown circuit starts operating, it stops regulating so that
the output voltage drops. When regulation stops, the S-13D1 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-13D1 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.
Thermal Shutdown Circuit
Operate: 160°C typ.^*1
Release: 130°C typ.^*1
*1. Junction temperature
Table 13
VSS level
Set value
VOUT Pin Voltage
22