S-1701 Datasheet, PDF (41/70 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.2.4_00
S-1701 Series
3. Shutdown pin (ON/OFF pin) (S-1701 Series A/ B/ C/ D/ E/ F/ G/ H/ J/ K/ L/ M types)
This pin starts and stops the regulator.
When the ON/OFF pin is set to the shutdown level, the operation of all internal circuits stop, and the built-
in P-channel MOS FET output transistor between the VIN pin and VOUT pin is turned off to substantially
reduce the current consumption. At this time, the current consumption equals that consumed by the
detector block, because the internal circuits of the detector are operating. The VOUT pin becomes the
V_SS level due to the internally divided resistance of several hundred kΩ between the VOUT pin and VSS
pin.
The structure of the ON/OFF pin is as shown in Figure 35. Since the ON/OFF pin is neither pulled down
nor pulled up internally, do not use it in the floating state. 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 as follows according to the product type.
• S-1701 Series A/ B/ C/ D/ E/ F types: Connect to the VIN pin.
• S-1701 Series G/ H/ J/ K/ L/ M types: Connect to the VSS pin.
Table 31
Product Type
A/ B/ C/ D/ E/ F
A/ B/ C/ D/ E/ F
G/ H/ J/ K/ L/ M
G/ H/ J/ K/ L/ M
ON/OFF Pin Internal Circuits VOUT Pin Voltage
“H”: Power on
“L”: Shutdown
“H”: Shutdown
“L”: Power on
Operating
Stopped
Stopped
Operating
Set value
V_SS level
V_SS level
Set value
Current
Consumption
I_SS
I_SSD
I_SSD
I_SS
VIN
ON/OFF
VSS
Figure 35
Seiko Instruments Inc.
41