Compact Size, Robust Protection — Ideal Diode Protection Switches

Application Note Hot Swap Controllers

Richtek’s RT1985/RT1986/RT1987 family is designed for high-power USB-C PD EPR* applications, offering ultra-low forward voltage drop, programmable soft-start, and comprehensive protection features. These family are well-suited for multi-port USB-C PD applications, docking stations, and battery management systems, enabling simplified power path control and enhanced system stability across multiple loads. (* EPR: Entended Power Range, up to 240W)

Key Features

	True Reverse Current Blocking (TRCB) Prevents reverse current flow to the input during shutdown or fault conditions, ensuring stable operation in multi-source power or ORing configurations.

	Programmable Soft-Start and Inrush Current Protection Supports external soft-start capacitors to enable smooth voltage and current ramp-up, effectively suppressing inrush current and minimizing disturbances to the main power rail.

	Start-up Sequencing and Slew Control Features EN control, and adjustable output slew rate, enabling power sequencing for smooth system start-up.

	Comprehensive Protection Features Built-in protections include start-up short-circuit, over-voltage, and thermal shutdown, providing robust system-level fault protection.

Why Choose Richtek?

The RT1985/RT1986/RT1987 family offers ultra-low 20mΩ RDS(ON) and quiescent current as low as 500μA, significantly reducing power loss and heat for improved efficiency and reliability.

☛ Discover more design insights and application examples in Application Note AN089。

Read Application Note

Featured Products * The following products are available at Digikey.

Product Number	Operation Vin	Max Continuous Current	OVP Threshold
RT1985	3.4V to 23V	8A	Fixed
RT1986	3.4V to 23V	5.5A	Fixed
RT1987	3.4V to 32V	8A	Programmable

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