BUY PS2702-1 https://www.utsource.net/itm/p/1185958.html
DARLINGTON-NPN-OUTPUT DC-INPUT OPTOCOUPLER
Description: PS2702-1 is a 4-pin SOP (Small Outline Package) type switching regulator with a NEC (Nippon Electric Company) logo. Features: * Low on-resistance: 0.5Ω (typ.) * Low input current: 1.5mA (typ.) * Low output voltage: 0.8V (typ.) * High efficiency: up to 95% Applications: PS2702-1 is suitable for applications such as DC-DC converters, voltage regulators, and power management in consumer electronics, automotive, and industrial equipment. (For reference only)