The Texas Instruments LM3370SD-3806/NOPB is a dual-channel synchronous step-down (buck) switching regulator with fixed output voltages of 1.6 V and 1.8 V, each rated for 600 mA. It operates from a 2.7 V to 5.5 V input rail and switches at a fixed 2 MHz, allowing small external inductors and capacitors. Typical applications include powering dual voltage rails in portable devices, wireless modules, and low-power embedded systems where board space is tight.
2 MHz switching — small passives, but watch the layout
The 2 MHz switching frequency shrinks the inductor and output capacitor values, which helps fit the design into a compact PCB area.
Lifecycle — obsolete, but still sourced
The LM3370SD-3806/NOPB is marked obsolete by Texas Instruments. For new designs, a current-production single-output buck like the LMR33630 or LM53625 may be considered, but these are single-output parts with different pinouts and package options.