S-19253E12H-U5T1U Datasheet, PDF (13/30 Pages) Seiko Instruments Inc – CMOS VOLTAGE REGULATOR WITH SOFT-START FUNCTION

FOR AUTOMOTIVE 105°C OPERATION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR WITH SOFT-START FUNCTION
Rev.1.0_00
S-19253xxxH Series
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.
Note that the current consumption increases when a voltage of 0.6 V to V_IN − 0.3 V is applied to the ON / OFF pin.
The ON / OFF pin is configured as shown in Figure 11.
Since the ON / OFF pin is internally pulled down to the VSS pin in the floating status, the VOUT pin is set to the V_SS
level. Refer to " Electrical Characteristics" for the ON / OFF pin current.
Table 7
ON / OFF Pin
Internal Circuit
VOUT Pin Voltage Current Consumption
"H" : ON
"L" : OFF
Operate
Stop
Constant value^*1
Pulled down to V_SS^*3
I_SS1^*2
I_SS2
*1. The constant value is output due to the regulating based on the set output voltage value.
*2. Note that the IC's current consumption increases as much as current flows into the pull-down resistor when
the ON / OFF pin is connected to the VIN pin and the S-19253xxxH Series is operating (refer to Figure 11).
*3. The VOUT pin voltage is pulled down to V_SS due to the discharge shunt circuit (R_LOW = 100 Ω typ.), the
feedback resistors (R_s and R_f) and a load.
VIN
ON / OFF
VSS
Figure 11
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