Overview
The PM8805TR, produced by STMicroelectronics, is a system-in-package designed for smart power supply of Power over Ethernet (PoE) Powered Devices (PD). It is capable of handling power levels up to 99.9 W and is compliant with IEEE 802.3bt, as well as the older IEEE 802.3at and 802.3af standards. The device integrates two active bridges, their driving circuitry, a charge pump for the high-side MOSFETs, and a hot swap MOSFET. It also includes an interface for PoE-PD that supports 4-pair PoE applications and can operate with power from either the Ethernet cable or an external power source such as a wall adapter.
Key Specifications
| Parameter | Specification |
|---|---|
| Package | VFQFPN 8x8x1.0 mm, 43 leads, 0.5 mm pitch |
| Power Handling | Up to 99.9 W |
| MOSFETs | 100 V N-ch MOSFETs with 0.2 Ω total path resistance for each active bridge; 100 V, 0.1 Ω high-side N-ch hot swap MOSFET |
| Compliance | IEEE 802.3bt / at / af |
| Auxiliary Source | Supports 12 V auxiliary sources |
| Operating Temperature | -40°C to 125°C |
| RoHS Compliance | Ecopack2 |
Key Features
- Dual active bridge, hot swap MOSFET, and PoE-PD interface in a system-in-package
- Supports 4-pair PoE applications
- Identifies the type of Power Sourcing Equipment (PSE) connected and provides classification indication via T0, T1, and T2 signals
- Programmable classification current with 3.3 ms delay and optional Autoclass feature
- Advanced energy-saving MPS timings and two-step hot swap current protection
- Controlled pre-charge of the output capacitor and PGD signal to enable external PWM controllers or DC-DC converters
- Thermal shutdown protection
Applications
- High power wireless data systems
- Security cameras
- Access points
- Public information displays
- PoE lighting systems
Q & A
- What is the PM8805TR used for? The PM8805TR is used for smart power supply of Power over Ethernet (PoE) Powered Devices (PD), handling power levels up to 99.9 W.
- What standards is the PM8805TR compliant with? The PM8805TR is compliant with IEEE 802.3bt, as well as the older IEEE 802.3at and 802.3af standards.
- What type of MOSFETs does the PM8805TR include? The PM8805TR includes 100 V N-ch MOSFETs with 0.2 Ω total path resistance for each active bridge and a 100 V, 0.1 Ω high-side N-ch hot swap MOSFET.
- Can the PM8805TR operate with external power sources? Yes, the PM8805TR can operate with power from either the Ethernet cable or an external power source such as a wall adapter.
- What is the package type of the PM8805TR? The PM8805TR comes in a VFQFPN 8x8x1.0 mm package with 43 leads and a 0.5 mm pitch.
- What is the operating temperature range of the PM8805TR? The operating temperature range is -40°C to 125°C.
- Does the PM8805TR support auxiliary power sources? Yes, it supports 12 V auxiliary sources.
- What kind of protection does the PM8805TR offer? The PM8805TR offers thermal shutdown protection and two-step hot swap current protection.
- How does the PM8805TR identify the type of PSE connected? The PM8805TR identifies the type of PSE connected and provides classification indication via T0, T1, and T2 signals.
- Can the PM8805TR be used in high power applications? Yes, it is suitable for high power wireless data systems, security cameras, access points, and other high power applications.
