TPS2372-4RGWT Integrated Circuits (ICs)

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1. Describe

TPS2372 contains all necessary functions to implement IEEE802.3at or IEEE802.3bt Powered Device (PD). Internal low switching resistors allow the TPS2372-4 and TPS2372-3 to support up to 90 W and 60 W respectively. Assuming 100 meters of CAT5 cable, this equates to 71.3 W and 51 W PD input. The TPS2372 has enhanced functionality. The automatic MPS feature enables applications that require a very low-power standby mode. The TPS2372 automatically generates the necessary pulse current to maintain the PSE power. An external resistor is used to enable this feature and program the MPS pulse current amplitude. The TPS2372 also implements a delay function to allow the remote PSE to complete its surge phase before releasing the power good (PG) output. This ensures that IEEE802.3bt is enabled requirements are met. Autoclass enable input also allows advanced system power optimization modes to comply with IEEE802.3bt standard.

2. Feature

    1. IEEE 802.3bt (draft) PD solution for Type 3 or Type 4 PoE

    2. Power levels to support Type-4 (TPS2372-4) 90-W and Type-3 (TPS2372-3) 60-W operation

    3. Rugged 100 V hot-swap MOSFETs

        – TPS2372-4 (typ): 0.1Ω, 2.2A current limit

        – TPS2372-3 (typ): 0.3Ω, 1.85A current limit

    4. Assigned power indicator output

    5. PG output with inrush completion delay

        – Compliant with PSE surge

    6. Automatic hold power signature (MPS)

        – Autoscale MPS for size 1-2 or 3-4 PSE

        – Supports ultra-low power standby mode

    7. Supports automatic sorting operations

    8. Support for PoE++ PSE

    9. -40°C to 125°C junction temperature range

  10. 20-pin VQFN package

3. Application

    1. IEEE 802.3bt (draft) compliant device

    2. Lighting

    3. Power module

    4. Dual Signature PD/Mandatory UPOE

    5. 4PPOE

    6. Pass-through system

    7. Security camera

    8. Multi-band access point

    9. Picocells

4. Pin configuration

5. Pin Description

6. Device functional mode

The following text is intended to aid in understanding the operation of the TPS2372, but is not intended to replace the IEEE 802.3bt standard. The pending IEEE 802.3bt standard is an update to IEEE 802.3-2012 Clause 33 (PoE), adding 4 classes of power supplies, high power options, additional features, and enhancements. Generally speaking, IEEE 802.3-2012 compliant devices are referred to as Type 1 or Type 2 devices, and higher power, enhanced classification devices are referred to as Type 3 or Type 4 devices. Class 3 equipment also includes Class 0-4 equipment with 4-pair capability. Standards change and should always be referenced when making design decisions. The IEEE 802.3bt standard defines a method for safely supplying power to a PD (Powered Device) over a cable from a Power Sourcing Equipment (PSE) and then removing power when the PD is disconnected. The process goes through three operating states of idle state and detection, classification and operation. Type 3 and 4 PSEs also use a fourth operating state, called "connectivity check", to determine if the PDs are identical (single interface) or independent (dual interface or commonly referred to as "dual signature" in the IEEE802.3bt standard) ) on the categorical signature of each pair of sets. The PSE de-energizes the cable (idle state) while periodically checking to see if something is plugged in; this is called detection and also includes a connection check for a Category 3 or Category 4 PSE. The low power levels used during detection and connection checks are unlikely to damage equipment not designed for PoE. If a valid PD signature is present, the PSE may ask the PD how it needs a lot of power; this is called classification. If the PSE has sufficient capacity, the PSE can power the PD Class 3 or 4 PSE requires enhanced hardware classification of Class 3 or 4 respectively. Type requires 2 PSEs for Type 1 Hardware Classification and Data Layer Classification, or Enhanced Type 2 Hardware Classification. Type 1 PSEs do not require hardware or data link layer (DLL) classification. A Type 3 or Type 4 PD must have Type 3 or Type 4 hardware classification and DLL classification, respectively. Class 2 PDs must have Class 2 hardware classification as well as DLL classification. PDs may fall back to the default, 13-W current-encoded class, or one of the other four choices if Type 2, or one of the other six if Type 3, If Type 4, one of the other eight choices. DLL classification occurs after power up and the Ethernet data link has been established.