What this part does — and why the 2 MHz switching matters
The Texas Instruments LM3674MF-1.5 is a fixed-output step-down (buck) switching regulator delivering a regulated 1.5 V rail from an input voltage between 2.7 V and 5.5 V. It is designed for battery-powered or low-voltage portable equipment where board space is tight and efficiency matters — the 2 MHz switching frequency lets you use small ceramic capacitors and a compact inductor, shrinking the overall power supply footprint. The synchronous rectifier (internal low-side FET) improves efficiency at light loads, which is typical for always-on or standby circuits in handheld devices, IoT nodes, and portable instruments. The part is rated for -30°C to 85°C ambient, so it fits indoor commercial and industrial environments but not automotive under-hood or extended-temperature outdoor gear.
Fixed 1.5 V output — no external divider needed
The output is fixed at 1.5 V. That means no external feedback resistor divider is required — just the inductor, input/output caps, and the chip.
600 mA output — sizing the load budget
The LM3674MF-1.5 is rated for 600 mA continuous output current. That is enough for a small microcontroller plus a few peripherals, a wireless module (Bluetooth Low Energy, Zigbee), or a sensor node. It is not sized for a motor driver or a high-current RF power amplifier. When you lay out the board, keep the input and output capacitors close to the IC — the 2 MHz switching edges are fast, and loop inductance hurts both efficiency and output ripple.
Package and mounting — SOT-23-5
The part comes in a 5-pin SOT-23 package. It is a surface-mount part.
Lifecycle and sourcing — active, no LTB risk
The LM3674MF-1.5 is listed as Active in production. There is no last-time-buy notice or obsolescence risk on this part today. It is not AEC-Q100 qualified, so it is not intended for automotive-grade designs. The part is RoHS non-compliant (per the ledger), which may matter for EU RoHS or similar regulatory requirements — verify your exemption or consider the RoHS-compliant suffix variant if needed. For current availability and pricing, the part is sourced and quoted to order through independent distribution; submit an RFQ for real-time stock and price confirmation.