S-13A1 Datasheet, PDF (30/74 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-13A1 Series
Rev.2.1_00
3. ON / OFF pin
This pin starts and stops the regulator.
When the ON / OFF pin is set to OFF level, the entire internal circuit stops operating, and the built-in P-channel MOS
FET 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 0.3 V to V_IN − 0.3 V is applied to the ON / OFF pin.
The ON / OFF pin is configured as shown in Figure 30 and Figure 31.
3. 1 S-13A1 Series A / 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 V_SS
level.
3. 2 S-13A1 Series B / D type
The ON / OFF pin is not internally pulled down to the VSS pin, so do not use these types with the ON / OFF pin in
the floating status. When not using the ON / OFF pin, connect the pin to the VIN pin.
Table 18
Product Type ON / OFF Pin
Internal Circuit
VOUT Pin Voltage
Current Consumption
A / B / C / D "H": ON
Operate
Set value
I_SS1^*1
A / B / C / D "L": OFF
Stop
V_SS level
I_SS2
*1. Note that the IC's current consumption increases as much as current flows into the pull-down resistor of
2.5 MΩ typ. when the ON / OFF pin is connected to the VIN pin and the S-13A1 Series A / C type is
operating (refer to Figure 30).
VIN
VIN
ON / OFF
VSS
Figure 30 S-13A1 Series A / C type
ON / OFF
VSS
Figure 31 S-13A1 Series B / D type
30