Dual fixed-output buck in a 5×4 WSON
The LM3370SDX-3021/NOPB: The 5×4 mm WSON package with exposed pad conducts heat into the PCB ground plane. The device operates from -30°C to 85°C ambient.
The 600 mA per-channel rating provides enough headroom for a low-power processor plus its peripheral bus, but designs drawing more than 600 mA on either rail will need a higher-current regulator or an external load switch to share the current. The fixed outputs eliminate the external divider network. The 2 MHz switching frequency works with small inductors.
No last-time-buy date or official successor order code is recorded in the available lifecycle data. This means the part is no longer manufactured or available through the factory channel; any remaining stock is in the independent distribution network. The 5×4 mm WSON package and fixed-output configuration mean that a pin-compatible replacement would need to match the same footprint and voltage settings — no direct cross is confirmed in the available records.