S-8351A20MC-J2FT2X Datasheet, PDF (17/51 Pages) Seiko Instruments Inc – SWITCHING REGULATOR CONTROLLER

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_01
S-8351/8352 Series
2. ON/OFF Pin (Shutdown Pin) (A Type)
ON / OFF pin stops or starts step-up operation.
Setting the ON / OFF pin to the “L” level stops operation of all the internal circuits and reduces the current
consumption significantly.
DO NOT use the ON / OFF pin in a floating state because it has the structure shown in Figure 17 and is not pulled
up or pulled down internally. DO NOT apply a voltage of between 0.3 V and 0.75 V to the ON / OFF pin because
applying such a voltage increases the current consumption. If the shutdown pin is not used, connect it to the VOUT
pin.
The ON / OFF pin does not have hysteresis.
Table 17
ON / OFF pin
CR oscillation circuit Output voltage
“H”
Operation
Fixed
“L”
Stop
≅VIN^*1
*1. Voltage obtained by subtracting the voltage drop due to the DC resistance of the inductor and the diode forward
voltage from VIN.
VOUT
ON / OFF
VSS
Figure 17 ON/OFF Pin Structure
17