SM8131B Datasheet, PDF (10/21 Pages) Nippon Precision Circuits Inc – The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically.

SM8131B
Switching to power-save mode
The internal circuit operating mode switches from ×1.0/×1.5 mode to power-save mode when both EN1 and
EN2 go LOW and do not switch HIGH for an interval of 1.63ms (max). This function turns the LEDs OFF and
automatically transfers internal circuit control to power-save mode, suppressing current consumption.
EN1 input
EN2 input
EN1+EN2
(1)
Internal
enable (CE)
(2)
Power
save
1.0 or 1.5
CE hold time 1.63ms (max)
Power
save
EN input signal and internal enable signal “CE”
(1) If the EN signals are input after power is applied and the POR time has expired, the internal enable signal
“CE” switches with the EN1 + EN2 signal.
(2) If the internal enable signal “CE” goes from HIGH to LOW and are held for an interval greater than the
“CE” hold time 1.63ms (max), the SM8131B switches to power-save mode. The internal circuits are reset
on the “CE” falling edge, and the current setting must be re-established before restart.
NIPPON PRECISION CIRCUITS INC.—10