RT6543A RT6543AGQW ML= Marking ML= IC QFN-20

The RT6543A / RT6543AGQW Power Management IC is a high-efficiency synchronous buck controller designed for DC-DC step-down conversion in compact power systems. Unlike conventional current-mode PWMs, the RT6543A achieves high efficiency without requiring external current-sensing resistors, simplifying circuit design and reducing power loss.

This controller is capable of driving synchronous rectifier MOSFETs and supports diode emulation mode during light-load operation, minimizing power consumption and improving thermal efficiency.

It includes comprehensive protection features such as Under-Voltage Lockout (UVLO), Over-Voltage Protection (OVP), Under-Voltage Protection (UVP), Over-Temperature Protection (OTP), and Current Limit Protection.

Packaged in a WQFN-20L (3x3mm) form factor and identified by marking code “ML=”, the RT6543A is ideal for motherboards, embedded power circuits, and notebook platforms requiring compact and energy-efficient power solutions.

Technical Summary:

• Model: RT6543A / RT6543AGQW
• Marking Code: ML=
• Type: Synchronous Buck Controller (PWM)
• Efficiency: High, no external current-sense resistor required
• Mode: Diode Emulation at light load
• Protection: UVLO, OVP, UVP, OTP, Current Limit
• Package: WQFN-20L (3x3mm)
• Applications: Motherboards, notebooks, embedded systems, DC-DC converters