RT9728CHGE

Overview

The RT9728CHGE is a single-channel high-side power switch IC featuring a P-channel MOSFET. It operates within a supply voltage range of 2.5 V to 5.5 V and supports an output current up to 1.3 A. The device includes a programmable current limit adjustable from 75 mA to 1.3 A via an external resistor. It has a maximum on-resistance of 120 mΩ. The component functions across a temperature range of -40°C to +85°C and is housed in a SOT-23-6 surface-mount package.

Feature Summary

• Integrates a low on-resistance P-channel MOSFET for efficient power distribution.
• Features externally programmable current limiting to protect downstream loads.
• Includes built-in thermal shutdown and under-voltage lockout protection mechanisms.

Applications

• USB port power switching and protection
• Peripheral load distribution in consumer electronics
• Battery-powered device power management

Procurement Notes

Verify the specific suffix 'CHGE' against the manufacturer's latest datasheet to confirm pinout and electrical characteristics, as suffixes often denote tape-and-reel packaging or specific temperature grades. Ensure compatibility with your PCB footprint for the SOT-23-6 package. Cross-reference the part number with official distributor catalogs to confirm current production status and availability before finalizing procurement plans.

Selection Notes

Select this component when a compact, single-channel high-side switch with adjustable current limiting is required. It is suitable for applications needing protection against overcurrent conditions without external discrete components. Consider the 120 mΩ on-resistance for power loss calculations and ensure the external programming resistor values align with the desired trip current between 75 mA and 1.3 A.

Part Context

This part belongs to the Richtek RT9728 series of power distribution switches. These ICs are designed primarily for USB applications and general-purpose load switching. The series offers integrated protection features to simplify system design by replacing multiple discrete protection components with a single monolithic solution.

Replacement Considerations

The RT9728AHGE is listed as an alias or variant within the same family. Verify functional equivalence regarding current limits and package dimensions before substitution. No other direct cross-model substitutes are confirmed in the provided documentation.

FAQ

How is the current limit programmed?

The current limit is programmable from 75 mA to 1.3 A using an external resistor connected to the control pin.

What protection features are included?

The device includes programmable current limiting, thermal shutdown, and under-voltage lockout (UVLO).