S-8353A20MC-IQFT2X Datasheet, PDF (17/49 Pages) Seiko Instruments Inc – BUILT-IN TRANSISTOR SWITCHING REGULATOR

STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
Rev.3.0_01
S-8353/8354 Series
3. ON / OFF Pin (Shutdown Pin) (SOT-23-5 Package Products of A and H Types)
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 10 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 ON / OFF 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 10 ON/OFF Pin Structure
17