The LM3671 is a 2MHz, 600mA step-down DC-DC converter from TI. It is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600mA load current, over the entire input voltage range. There are several different fixed voltage output options avail- able as well as an adjustable output voltage version range from 1.1V to 3.3V. The device offers superior features and performance for mo- bile phones and similar portable systems. Automatic intelli- gent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ.). Hys- teretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ.) during light load and standby operation. Internal synchronous rectification provides high ef- ficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typ.). The LM3671 is available in SOT23-5, tiny 5-bump micro SMD and a 6-pin LLP packages in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ.) al- lows use of tiny surface-mount components. Only three ex- ternal surface-mount components, an inductor and two ceramic capacitors, are required.
The LM3671 is a 2 MHz, 600 mA step‑down DC‑DC converter optimized for powering low‑voltage circuits from a single Li‑ion cell. It operates from 2.7 V to 5.5 V input and offers both fixed‑voltage and adjustable‑output versions with automatic PWM/PFM mode switching.
The document provides a general description, features, ordering information, pin definitions for both SOT23‑5 and 5‑bump micro SMD packages, electrical characteristics, thermal data, mechanical dimensions, and compliance statements.
| Input Voltage Range | 2.7 V to 5.5 V |
|---|---|
| Maximum Load Current | 600 mA |
| Switching Frequency (typ) | 2 MHz |
| Quiescent Current (typ) | 16 pA |
| Shutdown Current (typ) | 0.01 pA |
| Package Options | SOT23‑5 and 5‑bump micro SMD |
The LM3671 operates from 2.7 V to 5.5 V input.
In shutdown mode the device draws a typical 0.01 pA.
The LM3671 is offered in SOT23‑5 and 5‑bump micro SMD packages.