AUTOMOTIVE, 125°C OPERATION, 36 V INPUT, 250 mA VOLTAGE REGULATOR
S-19212B/DxxA Series
Rev.5.3_00
3. ON / OFF pin
The ON / OFF pin controls the internal circuit and the output transistor in order to start and stop the regulator. When
the ON / OFF pin is set to OFF, the internal circuit stops operating and the output transistor between the VIN pin
and the VOUT pin is turned off, reducing current consumption significantly.
The internal equivalent circuit related to the ON / OFF pin is configured as shown in Figure 16. Since the ON / OFF
pin is neither pulled down nor pulled up, do not use it in the floating status. When not using the ON / OFF pin,
connect it to the VIN pin. Note that the current consumption increases when a voltage of VSL max.*1 to VIN − 0.3 V is
applied to the ON / OFF pin.
Table 14
Product Type
B / D
ON / OFF Pin
"H": ON
Internal Circuit
Operate
VOUT Pin Voltage
Constant value*2
Current Consumption
ISS1
ISS2
*3
B / D
"L": OFF
Stop
Pulled down to VSS
*1. Refer to Table 13 in " Electrical Characteristics".
*2. The constant value is output due to the regulating based on the set output voltage value.
*3. The VOUT pin voltage is pulled down to VSS due to combined resistance (RLOW = 70 kΩ typ.) of the discharge
shunt circuit and the feedback resistors, and a load.
VIN
ON / OFF
VSS
Figure 16
15
ABLIC [ ABLIC ]
