The LMR3650x is a wide input, low-quiescent current, synchronous buck converter that operates over a wide range of duty ratio and switching frequencies, from 200 kHz to 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 LMR3650x to maintain the output voltage regulation. With an internally compensated design optimized for minimal output capacitors, the system design process with the LMR3650x is simplified significantly compared to other buck regulators available in the market.

The device is designed to minimize external component cost and solution size while operating in all demanding industrial environments. An internally compensated control loop simplifies the design procedure, and is optimized to reduce the required output capacitance, reducing solution size and cost. The LMR3650x 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 LMR3650x comes in an ultra-small 2-mm × 2-mm (HotRod™) QFN package along with specially designed corner anchor pins for reliable board level solder connections. Given that the package size is very small and the increase reliability of solder connectivity due to corner anchor pins, the LMR3650x offers a reduced solution size and high reliability for space constrained industrial applications.