STMicro’s Advanced Chipset Brings 100W PoE Standard to Connectivity and Smart-Building Apps

April 8, 2019 Alix Paultre

A chipset from STMicroelectronics lets users build Powered Devices (PDs) compliant with the IEEE 802.3bt Power-over-Ethernet (PoE) specification. The PM8804 and PM8805 provide the PoE-converter circuitry for PDs up to class-8, which defines a usable power budget of 71 Watts. 

The PM8804 implements a complete PWM controller for a 48V isolated flyback or forward converter, including dual low-side gate drivers for high-efficiency forward active-clamp topologies. The operating frequency is selectable up to 1MHz, and the device features a high-voltage startup regulator with 20mA output capability.

The PM8805 companion chip contains two active bridges, a charge pump for driving high-side MOSFETs, a hot-swap FET, and the IEEE 802.3bt compliant interface. The PM8805 generates a Power-good signal for enabling the PM8804 and other circuitry such as an LED driver, and supports Maintain Power Signature (MPS) current control that allows the PD to enter power-saving standby without being disconnected.

The PM8804 is packaged as a 3mm x 3mm, 0.5mm-pitch VFQFPN-16, and priced at $0.60 for orders of 1,000 pieces. The PM8805 in 8mm x 8mm thermally enhanced VFQFPN-43 featuring exposed pads is $4.50.

For more information, visit www.st.com.

Previous Article
Infineon Type 4A, 4B NFC Reference Tags Approved by NFC Forum
Infineon Type 4A, 4B NFC Reference Tags Approved by NFC Forum

Based on the SECORA Pay security solution, the tags will be introduced at this month’s NFC Forum Member Mee...

Next Article
Knowles Launched AISonic for Mobile, Ear and IoT Devices

First processor specifically designed for advanced audio and machine learning applications, enhancing power...