Power Switch ICs – Power Distribution 70mohm/55mohm, 3A/2.5A/2A/1.5A/1A/0.5A High-Side Power Switches with Flag

RT9742GGJ5 – 1A USB Power Switch with Status Flag – Richtek

Optimize your power management design with the RT9742GGJ5 from Richtek, a high-efficiency USB power distribution switch. This robust IC safeguards portable electronics and embedded systems with advanced protection features while minimizing voltage drop through its ultra-low 70mΩ Rds(on). Ideal for space-constrained applications, it simplifies circuit design and enhances reliability.

Key Features

• Output Current: 1A continuous load capacity
• Ultra-Low Resistance: 70mΩ Rds(on) typical (N-Channel)
• Voltage Range: 2.7V to 6V load operation
• Protection Suite: Fixed current limiting, reverse current blocking, thermal shutdown & UVLO
• Control Interface: Simple On/Off logic with non-inverting input
• Status Monitoring: Integrated fault flag output

Technical Specifications

This single-channel high-side switch features a 1:1 input/output ratio in a compact TSOT-23-5 package. Engineered for surface-mount assembly, it operates across industrial temperatures (-40°C to +85°C) without requiring a separate Vcc supply. The load discharge function rapidly de-energizes outputs during shutdown, while the status flag pin provides real-time fault diagnostics for over-current or overheating conditions.

Typical Applications

• USB port power management in laptops/desktops
• Hot-swap protection for portable consumer devices
• Battery-powered IoT sensors and wearables
• Peripheral power control in embedded systems
• Power rail isolation in industrial controllers

About Richtek

Richtek Technology Corporation is a global leader in analog IC design, renowned for innovative power management solutions. With over 30 years of industry experience, Richtek consistently delivers high-reliability components that meet rigorous automotive, industrial, and consumer standards.

Richtek’s vertical integration—from silicon design to final testing—ensures exceptional quality control and supply chain stability. Their patented technologies in thermal management and efficiency optimization make them a preferred partner for Fortune 500 electronics manufacturers worldwide.

About Power Distribution Switches

Power distribution switches are critical safety components that manage electrical current flow between sources and loads. They prevent system damage during faults by incorporating current limiting, thermal protection, and voltage lockout features while minimizing power loss.

In modern electronics, these ICs enable intelligent power sequencing, hot-plug capability, and graceful shutdowns. Their compact footprint makes them indispensable for USB interfaces, battery charging circuits, and any application requiring controlled power delivery with diagnostic feedback.

Packaging Options

Available in industry-standard formats: Tape & Reel (TR), Cut Tape (CT), and Digi-Reel®. Specify your preferred packaging during checkout.

FAQs

Question: Does this IC require an external Vcc supply?
Answer: No – the RT9742GGJ5 operates without a separate Vcc/Vdd supply, simplifying circuit design.

Question: What triggers the status flag output?
Answer: The open-drain flag activates during over-temperature, over-current, or reverse-current events.

Question: Can it handle USB-C power delivery?
Answer: While suitable for 5V USB applications, verify voltage compatibility for USB-PD implementations exceeding 6V.

Question: Is reverse polarity protection included?
Answer: Yes – integrated reverse-current blocking safeguards your circuit.

Question: What’s the typical turn-off time with load discharge?
Answer: The internal discharge circuit de-energizes outputs in <1ms during shutdown (refer to datasheet for exact values).

Question: How does thermal protection function?
Answer: The IC automatically cuts output at ≈140°C junction temperature, resuming operation when cooled by 20°C.

Note: Product images are representational. Access the full datasheet at PCXCo.com.

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