LM3242

The Texas Instruments LM3242 is a highly efficient, 6-MHz (typical) switching frequency DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Li-Ion cell. It steps down input voltages from 2.7V to 5.5V to an adjustable output voltage range of 0.4V to 3.6V, controlled via a VCON analog input.

This converter offers multiple operating modes, including PWM, ECO, and Bypass, to optimize efficiency and battery life. In PWM mode, it operates at a fixed 6 MHz to minimize RF interference. At light loads, it automatically enters ECO mode, reducing switching frequency and quiescent current. Bypass mode minimizes voltage dropout, especially in low-battery conditions.

The LM3242 features a maximum load capability of 750mA, with up to 1A in bypass mode. It boasts high efficiency, reaching 95% typical at 3.9 VIN and 3.3 VOUT at 500 mA. Integrated protection features include current overload and thermal overload protection, along with a soft-start function.

Available in a compact 9-bump DSBGA package measuring 1.51 mm x 1.385 mm, the LM3242 allows for a small external component count, requiring only one inductor and two ceramic capacitors due to its high switching frequency. This makes it suitable for space-constrained battery-powered devices.