ST890BDR

Overview

The ST890BDR is a low-voltage P-channel MOSFET power switch designed for high-side load switching applications. It operates with input voltages ranging from 2.7 V to 5.5 V, supporting both 3 V and 5 V systems. The device features an internal current limiting circuitry that protects the input supply against overload, with a maximum current limit of 1.2 A. This limit is programmable via a resistor connected from the SET pin to ground. Thermal overload protection limits power dissipation and junction temperatures. The switch offers a typical on-resistance of 90 mΩ and includes an active-low FAULT indicator output.

Feature Summary

• Programmable current limiting up to 1.2 A using an external resistor
• Integrated thermal shutdown protection to limit junction temperature
• Active-low FAULT indicator output for status monitoring
• Low quiescent current operation

Applications

• High-side load switching in 3 V and 5 V systems
• Input supply overload protection
• Power distribution in portable electronics

Procurement Notes

Verify the specific suffix 'BDR' corresponds to the tape-and-reel packaging configuration required for your assembly line. Confirm the operating temperature range of -40°C to +85°C aligns with your environmental specifications. Ensure the 8-SOIC package dimensions fit your PCB footprint constraints. Check RoHS compliance status if restricted substances are a concern for your target market.

Selection Notes

Select this component when a high-side switch with programmable current limiting is required for 3 V or 5 V loads. The ST890BDR is suitable for applications needing thermal protection and fault indication. Consider the 90 mΩ typical on-resistance for efficiency calculations. Verify that the external resistor value correctly sets the desired current limit below the 1.2 A maximum threshold.

Part Context

The ST890BDR belongs to the ST890 family of intelligent power switches manufactured by STMicroelectronics. These devices utilize BCD technology to provide robust protection features in a compact surface-mount package. The family is designed for general-purpose load switching where overcurrent and overtemperature conditions must be managed efficiently within low-voltage digital systems.

Replacement Considerations

The ST890CDR is listed as a parameter-equivalent substitute. Verify compatibility regarding the SO-8 package and electrical characteristics before substitution.

FAQ

How is the current limit adjusted?

The current limit is programmed by connecting a resistor between the SET pin and ground.

What protection features are included?

The device includes programmable current limiting and thermal shutdown protection.