USB bus power switches. USB bus power switches USB power switch

The MIC2025/26 is a high-end FET IC optimized for USB port power rails that require additional protection. It is used as a USB bus voltage switch and as a current limiter. MIC2025 is a single switch, MIC2026 is a dual channel switch.

USB power bus switches are designed to solve several problems:

UL Listed User Safety

Vbus voltage control, energize and de-energize

Load overcurrent protection

Receiving signals about emergency conditions.

The MIC2025/26 has a current limit and thermal shutdown circuit to protect the load from abnormal situations. If overheating occurs, the output is blocked until the fault is corrected. Removing the load or switching the enable input will reset the transistor.

Also, the MIC2025/26 have a soft start circuit that minimizes inrush current in applications where there is a high capacitive load. The error output signal allows you to manage abnormal situations of overheating or overcurrent.

Transistors are available in 8-pin MSOP and SOP packages.

Power switches are used in equipment that uses HOST ports and USB OTG ports.

Peculiarities

— channel resistance in the open state 140 mΩ max.
- supply voltage range 2.7 - 5.5 V
— minimum current per channel 500 mA
— protection against overheating and short circuit
- error flag appearance delay 3ms
- blocking when the supply voltage drops
- blocking the flow of current in the opposite direction
- logic-compatible input
- soft start circuit avoids voltage surges
— low current consumption
- pin compatible with MIC2525

Application area

- USB peripherals
- USB hubs
- load switching
- ACPI power distribution
— laptops, PDA

Typical Application Diagram

Application with USB controller

Specifications:

Delay in the appearance of a moisture error when hot-switched on - 1 ms
Scheme smooth inclusion avoids voltage surges
UL Recognized: Ref No. 205202
Limiting the output current (no more than 1 A) allows you to protect the power supply from short circuit
Thermal protection
Maximum static output current - 500 mA
Miniature SO-8 case
Input voltage range from 2.7 to 5.5 V
Public key resistance at 5 V input voltage - no more than 140 mOhm
Current consumption in standby mode - no more than 1 μA
Maximum current consumption in operating mode - 200 μA
Under Voltage Lockout (UVLO)

Application:

USB hubs for desktop and laptop PCs
USB monitor hubs
Self powered USB hubs
Powerful USB devices a, requiring inrush current limitation
General purpose power supply switches

Structural scheme:

Pin Arrangement:

General description:

LM3526 - USB bus voltage switch and current limiter. This two-port instrument is ideal for notebook and laptop applications.

The 1 ms error flag setting delay avoids erroneous hot-plug trips.

The instrument has two thermal protection circuits, one for each port. If one of the switches overheats, the other can continue to work.

The LM3526 has an input voltage range of 2.7V to 5.5V, which allows it to be used as a 3.3V surge suppressor for USB peripherals, as well as self-powered 5.5V devices. Control inputs of the device are compatible with 3.3 V and 5.0 V logic.

small size, low resistance public key and 1ms error flag delay make the LM3526 ideal for hub and self-powered miniature applications.

Documentation:

You can get advice and purchase components from the official suppliers of the company

Switch power supply from USB port

Progress in the field of design and manufacture of microcircuits not only makes it possible to place a complex device in one microcircuit, but also leads to a significant reduction in the electrical power consumed by this device, which makes it possible to apply new methods of power supply. Recently, in our magazine, we talked about the technology for supplying power to terminal devices operating in 10Base-T, 100Base-TX and 1000Base-T networks directly over CAT5 and higher Ethernet cables, which was called PoE (Power over Ethernet). This article will focus on the ability to power the switch from the USB port. Recall that the USB port provides external devices with a voltage of 5 V and a current of up to 500 mA.

For example, take the miniature unmanaged switches MultiCo EW-108R and EW-105T. Both switches are based on highly integrated chips (Realtek RTL8309SB and IC+ IP175C), which are ready-made nine- and five-port switches. These switches can be powered from external source power supply, and from the USB port of the nearest computer or server (the power supply and cable for connecting to the USB port are included in the package).

Switches EW-108R and EW-105T are designed to work in Ethernet networks of IEEE 802.3 (10Base-T) and IEEE 802.3u (100Base-TX) standards and have 8 and 5 RJ-45 ports, respectively. All ports support automatic MDI/MDIX polarity detection. This eliminates the need for crossover cables or uplink ports. Either port can be connected to a computer or another switch using a straight-through twisted-pair cable.

Switching is carried out using Store and forward technology, which provides filtering of packets and removal of damaged ones. The non-blocking architecture of the switches (Non-blocking & Non-head-of-line blocking) guarantees performance at wire speed. Flow control is performed using the IEEE 802.3x protocol on a frame-by-frame basis in full-duplex mode and backpressure in half-duplex mode. The switches have a built-in 2K entry MAC address table and 512/768 KB (EW-105T/EW-108R) buffer memory. Auto-negotiation of 100Base-TX or 10Base-T speeds and duplex/half duplex connection mode makes the switch installation in an existing Ethernet network very simple.

The switches have a power-on indicator and port indicators (one for each port) that allow you to determine the presence of a connection and network activity. durable metal cases ensure good cooling and long term services. The dimensions of the case are practically determined by the dimensions of the interface connectors and are 79X62S20 (EW-105T) and 94X62S20 (EW-108R) mm. Thanks to passive cooling, the operation of the switches is absolutely silent.

The compact size and low power consumption open up a wide range of options for choosing the location of switches (for example, they can be hidden in cable channel). With the self-adhesive magnetic rubber feet included, the switch can be easily attached to any steel surface.

To test the operation, a workstation based on Intel processor Pentium 4 3.0 GHz equipped with an integrated motherboard gigabit network adapter Marvel Yukon Gigabit Ethernet 10Base-T/100Base-TX /1000Base-T Adapter that worked in 100Base-TX mode.

An operating room was installed on the workstations. Windows system XP Professional SP1.

To generate network traffic over the TCP protocol and measure performance, we used software package NetIQ Chariot 5.0 with High_Performance_Throughtput.scr load file.

The test was performed with a gradual increase in the load on the switch. At the first stage, transmission was switched on between the first and second stations, then between the second and third, and so on - until the transmission was switched on between the last (fifth or eighth) and first stations. As a result, at the last stage, all stations and, accordingly, all ports of the switch worked in duplex mode. The test results (Figures 1 and 2) show that the switches can easily handle the load. Performing the test with different power arrangements (from an external power supply or from a USB port) did not reveal any differences in the operation of the switches.

The editors express their gratitude to MultiCo ( www.multico.com.ru ) for providing EW-105T and EW-108R switches for testing.

ATEN's US3342 is a device sharing switch that allows you to connect to 2 USB ports 3.2 Gen 2 laptops equipped with USB-C plus 4 more USB 3.2 Gen 2 ports peripherals for joint work and data exchange. The US3342 switch is USB 3.2 Gen 2 compliant, supports transfer rates up to 10Gbps, and is also compatible with USB 3.1 Gen 1, USB 2.0, and USB1.1.

With the US3342 switch, you can quickly and easily switch between computers with a remote port selector whose LED indicates which computer is active. Also supports USB-C PD power delivery for laptops with USB-C ports and Windows control or Mac with 5V, 9V, 15V and 20V profiles.

With an exclusive feature provided by the BEZEL X software, the US3342 switch allows two laptops to share files and data between two different platforms - Windows and Mac, by dragging the mouse from one screen to another. Software BEZEL X makes it easy to manage and transfer files with just one touch.

The connection cables included with the switch will eliminate the additional cost of purchasing USB cables. For flexible installation, USB-C cables are included, allowing users to connect laptops with USB-C. The US3342 switch is the most cost-effective solution for laptops equipped with USB-C ports.

As a result, the US3342 switch, with its compact all-in-one design, is ideal solution for users who want to save desktop space and organize their workspace efficiently.

Allows two computers equipped with USB-C ports to share four USB 3.2 Gen 2 devices with transfer rates up to 10 Gbps
Supports USB-C Power Delivery 3.0 specification for laptop charging up to 85W (optional USB-C power adapter required)*
BEZEL X software - provides file transfer and mouse control between two platforms - Windows and Mac
Supports 5V, 9V, 15V and 20V power profiles
Switch Devices at the Push of a Button Using a Remote Port Switch
Console LED - lets users know which computer is active
Plug-and-play operation - no driver installation or connection required external adapter food
Over current protection
*We recommend that you use a Limited Power Adapter (LPS) that meets the USB-C PD specification above 65W to charge your device. Minimum system requirement regarding nutrition for the operation of the main USB functions and video signal output is at least 5V, 3A.

1 0G USB-C Gen2Switch ATEN US3342 allows you to work with two USB-C computers as with a single workstation using shared USB peripherals

The 10G USB-C Gen 2 Sharing Switch US3342 with Power Pass-through is specially designed by ATEN for programmers, developers, system administrators, PC repairers and content creators to improve the efficiency of dual system operations.

10G USB-C Gen 2 Edge Switch US3342

US3342-Sharing devices between two USB-C computers
No more dealing with connecting and disconnecting. Connect your USB-C laptops to US3342 and start a joint . Use just one set of keyboard and mouse to seamlessly control two systems and share data and multiple USB devices without having to plug and unplug or configure complex network settings server / client.

US3342-Manage two computers as one
Switching between computers has never been so easy and intuitive. Mouse Switching allows you to easily move the mouse cursor across the screen border and onto the target computer to switch control without pressing a button. Less time switching, more time creating and producing.

US3342-Ultra-fast operation
The US3342 creates a direct link between two computers with transfer rates up to 10Gbps. Via general access to the clipboard, you can copy and paste or drag and drop files, images and texts directly from each other without using a storage device as an intermediate link with double the transfer time. The ultra-fast 10Gbps transfer speed allows you to work at an unprecedented speed, 20 times faster than USB 2.0.

US3342 with Power Pass-throgh - Power your laptop and USB devices
The 85W 3.0W USB-C pass-through power supply charges one of your laptops while also providing enough power for power-hungry devices such as external hard drives and gaming devices. You can use your favorite keyboard and mouse to work and play, even with powerful RGB gaming hardware.

US3342:Two Systems as One Computer Environment - Limitless Switching and Transfer
With the US3342, your computers can run smoothly and communicate, whether they're Windows to OS X, OS X to OS X, or Windows to Windows.