The LMR33620 is a synchronous peak-current-mode buck regulator designed for a wide variety of industrial applications. Advanced high speed circuitry allows the device to regulate from an input voltage of 20 V, while providing an output voltage of 3.3 V at a switching frequency of 2.1 MHz. The innovative architecture allows the device to regulate a 3.3-V output from an input of only 3.8 V. The regulator automatically switches modes between PFM and PWM depending on load. At heavy loads, the device operates in PWM at a constant switching frequency. At light loads, the mode changes to PFM with diode emulation allowing DCM. This reduces the input supply current and keeps efficiency high. The device features internal loop compensation which reduces design time and requires fewer external components than externally compensated regulators.

The LMR33620 is available in an ultra-miniature VQFN package with wettable flanks. This package features extremely small parasitic inductance and resistance, enabling very high efficiency while minimizing switch node ringing and dramatically reducing EMI. The VIN/PGND pin layout is symmetrical on either side of the VQFN package. This allows the input current magnetic fields to partially cancel, resulting in reduce EMI generation.