JAJSIO5B July 2019 – February 2020 LMR36506-Q1
ADVANCE INFORMATION for pre-production products; subject to change without notice.
It is often desirable to synchronize the operation of multiple regulators in a single system. This technique results in better defined EMI and can reduce the need for capacitance on some power rails. The LMR36506-Q1 device provides a MODE/SYNC pin variant, which allows synchronization with an external clock. The LMR36506-Q1 implements an in-phase locking scheme – the rising edge of the clock signal provided to the input of the LMR36506-Q1 corresponds to the turning on of the high-side device. This function is implemented using phase locking over a limited frequency range, eliminating large glitches upon initial application of an external clock. The clock fed into the LMR36506-Q1 replaces the internal free-running clock, but does not affect frequency foldback operation. Output voltage continues to be well-regulated. The device remains in FPWM mode and operates in CCM for light loads when synchronization input is provided.