S1132 Datasheet, PDF (14/35 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION AND LOW DROPOUT

HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1132 Series
Rev.4.2_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.
The VOUT pin becomes the V_SS level due to the internally divided resistance of several hundreds kΩ between the
VOUT pin and VSS pin.
The structure of the ON/OFF pin is as shown in Figure 14. Since the ON/OFF pin is neither pulled down nor pulled up
internally, do not use it in the floating status. In addition, note that the current consumption increases if a voltage of 0.3
V to V_IN – 0.3 V is applied to the ON/OFF pin. When the ON/OFF pin is not used, connect it to the VSS pin if the
product type is “A” and to the VIN pin if it is “B”.
Table 7
Product Type
A
A
B
B
ON/OFF Pin
“L”: ON
“H”: OFF
“L”: OFF
“H”: ON
Internal Circuit
Operate
Stop
Stop
Operate
VOUT Pin Voltage
Set value
V_SS level
V_SS level
Set value
Current Consumption
I_SS1
I_SS2
I_SS2
I_SS1
VIN
ON/OFF
VSS
Figure 14
14
Seiko Instruments Inc.