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The LP6451X is a synchronous buck converter supporting up to 3A output current. The LP6451X employs an adaptive constant-on-time (COT) control scheme to achieve fast load transient response. The external components are minimized, requiring only one inductor, two resistors, and two capacitors. The LP6451X supports both aluminum polymer capacitors and ceramic capacitors without extra compensation components. The LP6451X integrates PFM (Pulse Frequency Modulation) operation, which helps maintain the system efficiency at light load while the LP6451XF works in FPWM mode to achieve low output covering all load range. The LP6451X also integrates multiple protection functions, i.e., over-current protection (OCP), over-temperature protection (OTP), under-voltage lockout (UVLO), and short circuit protection (SCP). The LP6451X is available in a small 6-pin 1.6mmΧ2.9mm SOT23-6 package.