STMicroelectronics introduces single-channel load switches for high inrush current applications – EEJournal

Geneva, May 16, 2022 – STMicroelectronics has released single-channel versions of its high-side programmable switches, the IPS1025H and IPS1025H-32. With built-in protection against undervoltage, overvoltage, overload and overtemperature, they enable intelligent control of capacitive, resistive or inductive loads, which draw high inrush current.

The internally programmed current limit differentiates between the IPS1025H and the IPS1025H-32. The IPS1025H limit is 2.5 A and it is 5.7 A in the IPS1025H-32. In addition to the primary current limit, each switch has a user-programmable secondary limit to handle capacitive loads with high initial inrush current. The limit value and duration are set using external resistors and a capacitor.

Featuring a very wide supply and input pin voltage range of 8V to 60V and capable of handling up to 65V on the input pin, the compact devices ensure reliable performance in industrial applications. Typical uses for the IPS1025H include driving loads controlled by PLC modules and for use in factory automation equipment such as I/O devices and CNC machines. The IPS1025H-32, with its higher maximum current limit, is well suited for use with unidirectional motors in equipment such as vending machines.

The integrated MOSFET switch has a low Rds(on) (≤ 25 mΩ up to TJ = 125°C), which results in high power efficiency and low heat dissipation. With a single-pulse avalanche energy greater than 1J at 2A, the MOSFET improves the reliability of handling inductive loads. An integrated active gripper allows rapid demagnetization.

ST’s new programmable switches feature extensive built-in protection and diagnostics, which improve safety and reliability by handling undervoltage, overvoltage, overload, short circuit, ground or disconnect from the power rail. Individual fault signaling indicates overload and junction overtemperature events. An additional sensor is provided for case overheating protection. The switches comply with IEC 61000-4-2 ESD, IEC 61000-4-4, and IEC 61000-4-5 specifications for immunity to electrostatic discharge, fast transients, and surges.

Demo boards and software are available for quick evaluation. The boards include X-NUCLEO-OUT05A1 and X-NUCLEO-OUT06A1 digital output expansion boards for use with STM32 Nucleo development boards as well as software drivers associated with the X-CUBE-OUT5 software package which extends the functionality provided by STM32. The source code of a graphical user interface (STSW-IFAPGUI) is also available, which helps users to realize a complete industrial automation environment on the desktop.

The IPS1025H and IPS1025H-32 are currently in production and available in PowerSSO-24 starting at $3.51 for orders of 1000 pieces. For more information, visit