STMicroelectronics AN1441 ST890 High Side Switch Application Note

ST890 is a P-channel MOSFET power switch from ST, mainly used in PCMCIA and USB applications.

Brand: STMicroelectronics
Category: Other Electronics
Document type: Application Note
Language: English
Pages: 13
File format: PDF
File size: 380 KB
Published: 06 August, 2012
Updated: 30 September, 2023
Model: ST890
MD5 checksum: CD8726941A11A217F3F07E231CABDD8D
PDF: STMicroelectronics AN1441 ST890 High Side Switch Application Note PDF

About this manual

This document provides an application note for the ST890, a low voltage P-channel MOSFET power switch designed for high side load switching in PCMCIA slots and portable equipment. It details the device's internal block diagram, switch resistance characteristics, and short-circuit protection mechanisms.

What's inside

Functional description
Switch resistance
Short-circuit protection
Programming the current limit
Thermal protection
ON Pin Function
Fault signal behavior

Specifications

Switch resistance (Ron)	lower than 90 mΩ at Vcc = 3.0 V
Internal reference voltage	1.24 V
Thermal protection threshold	135 °C
Thermal hysteresis	15 °C

Frequently asked questions

What is the primary application of the ST890?

The ST890 is intended for high side load switching applications such as PCMCIA slots and portable equipment.

How is the current limit programmed?

The current limit is programmed using the SET pin, which is connected to an external resistor (Rset).

Under what conditions does the FAULT pin activate?

The FAULT pin activates if the current exceeds the set value, if a short-circuit occurs, or if the device enters thermal protection.

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