The LMR436x0 is a wide input, low-quiescent current, high-performance regulator that can operate over a wide range of duty ratio and switching frequencies, including sub-AM band at 400 kHz and above AM band at 2.2 MHz. During wide input transients, if the minimum on time or the minimum off time cannot support the desired duty ratio at the higher switching frequency settings, the switching frequency is reduced automatically, allowing the LMR436x0 to maintain the output voltage regulation. With an internally compensated design optimized for minimal output capacitors, the system design process with the LMR436x0 is simplified significantly compared to other buck regulators available in the market.

The LMR436x0 is designed to minimize external component cost and solution size while operating in all demanding industrial environments. The LMR436x0 family includes variants that can be set up to operate over a wide switching frequency range, from 200 kHz to 2.2 MHz, with the correct resistor selection from the RT pin to ground. To further reduce system cost, the PGOOD output feature with built-in delayed release allows the elimination of the reset supervisor in many applications.

The LMR436x0 comes in an ultra-small 2-mm × 2-mm QFN package with wettable flanks, allowing for quick optical inspection along with specially designed corner anchor pins for reliable board level solder connections.