S-1711 Datasheet, PDF (24/44 Pages) Seiko Instruments Inc – SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION

SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1711 Series
Rev.3.1_01
3. ON/OFF pin 1 and 2
These pins start and stop 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.
Since the S-1711 Series A/ B/ E/ F type has a built-in discharge shunt circuit to discharge the output capacitance, the
VOUT pin is forcibly set to VSS level. In the S-1711 Series C/ D/ G/ H type, the VOUT pin is set to VSS level through
several hundred kΩ internal divided resistors between the VOUT pin and the VSS pin. Note that the current
consumption increases when a voltage of 0.3 V to VIN − 0.3 V is applied to the ON/OFF pin.
The ON/OFF pin is configured as shown in Figure 24 and Figure 25. In the S-1711 Series A/ C/ E/ G type, the
ON/OFF pin is internally pulled up or pulled down to the VSS pin in the floating status, so the VOUT pin is set to the
VSS level. In the S-1711 Series B/ D/ F/ H type, the ON/OFF pin is not internally pulled up or pulled down, so do not
use the ON/OFF pin in the floating status. When not using the ON/OFF pin, connect it to the VIN pin in the product
B/ D type, and connect it to the VSS pin in F/ H type.
Table 14
Product Type
ON/OFF Pin
Internal Circuit
VOUT Pin Voltage
Current Consumption
A/ B/ C/ D
“H”: ON
Operate
Set value
ISS1^*1
A/ B/ C/ D
“L”: OFF
Stop
VSS level
ISS2
E/ F/ G/ H
“H”: OFF
Stop
VSS level
ISS2
E/ F/ G/ H
“L”: ON
Operate
Set value
ISS1^*1
*1. Note that the IC’s current consumption increases as much as current flows into the pull-up/pull-down
resistor when; the ON/OFF pin is connected to the VIN pin in the A/ C type, the ON/OFF pin is connected to
the VSS pin in the E/ G type (Refer to Figure 24).
(1) S-1711 Series A/ C/ E/ G Type
VIN
(2) S-1711 Series B/ D/ F/ H Type
VIN
E/G type
ON/OFF
A/C type
VSS
Figure 24
ON/OFF
VSS
Figure 25
24