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Texas Instruments TPS2383BPMRG4
- Part No.:
- TPS2383BPMRG4
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 64-LQFP
- Datasheet:
-
TPS2383BPMRG4.pdf
- Description:
- IC POE CNTRL 8 CHANNEL 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,323
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Product details
Overview
TPS2383BPMRG4 from Texas Instruments is an IEEE 802.3af-compliant octal Power Sourcing Equipment Manager (PSEPM) IC for PoE mid-span injectors and switches. It manages up to eight Ethernet ports with per-port discovery, classification, controlled di/dt power ramping, real-time 12-bit current/voltage acquisition, and hardware FAULT interrupt. It operates from a 44–57 V input and supports opto-coupled I²C isolation for system ground separation.
For engineers reviewing the TPS2383BPMRG4 datasheet, TPS2383BPMRG4 pinout, TPS2383BPMRG4 application, or TPS2383BPMRG4 equivalent, this device serves as a programmable, register-controlled PSE controller requiring external N-channel MOSFETs, dual-color LED status indication, and precise 25-kΩ resistive/capacitive legacy load detection - critical for industrial PoE switch design and UL/IEC950-compliant infrastructure.
Technical Context
The TPS2383BPMRG4 implements eight independent port state machines coordinated by a master sequencer that cycles through enabled ports for discovery, classification, and powered-mode monitoring. Its shared analog resources include a 12-bit A/D converter with 4-to-1 MUX for port voltage/current/resistance/capacitance measurement, a ramp control block using CR/CT/CINT timing elements, and dual SDA lines (SDA_I/SDA_O) enabling opto-isolated I²C communication without violating Ethernet ground isolation requirements.
Each port uses external 0.5-Ω sense resistors (RS pins) and 665-Ω discovery resistors (RD), with internal bias currents set by RT (120 kΩ). Gate drive (G pins) delivers up to 10 V to external N-MOSFETs, while UV/OV fault detection (40–44 V undervoltage, 56–63 V overvoltage) triggers fast turn-off via dedicated timers (256–32768 clock cycles). Classification occurs at 17.5 V with 12-bit resolution, supporting both IEEE-defined classes and custom thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Standard | Compliant to 802.3af Power over Ethernet specification for discovery, classification, and power delivery. |
| Port Count | Manages 8 independent Ethernet ports with per-port register control and status reporting. |
| Input Voltage Range | 44 V to 57 V on V48 pin - supports standard 48-V PoE supply with ±10% tolerance and UVLO at 30–38 V. |
| A/D Resolution | 12-bit port current and voltage acquisition - enables real-time monitoring of PD load conditions for diagnostics and compliance logging. |
| I²C Interface | Standard slave-mode 2-wire interface with separate SDA_I and SDA_O pins - allows opto-coupler isolation for ground-separated controller designs. |
| Power Ramp Control | Controlled di/dt ramp-up/down using CR capacitor - reduces EMI during PD power application and removal per 802.3af timing requirements. |
| LED Drivers | Eight tri-state L1–L8 outputs - support dual-color LEDs for per-port status indication (discovery/classification/power/fault) under full host microcontroller control. |
Pinout & Package
The TPS2383BPMRG4 is housed in a 64-pin LQFP (PM) package with exposed thermal pad, rated for –40°C to +85°C ambient operation. Pin functions are validated per TI SLUS565G datasheet Rev. August 2005.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V48 | +48 V input supply | Primary high-voltage rail (44–57 V); powers gate drivers and internal analog blocks; requires local 0.1-µF decoupling to AG2. |
| 1P–8P, 1N–8N | Port differential sense inputs | High-side (+48 V) and low-side (return) connections for each of 8 PoE ports; used for voltage regulation and fault detection. |
| 1G–8G | N-MOSFET gate drive outputs | Linear current-controlled outputs driving external low-side N-channel MOSFETs; ramp up/down current to limit inrush and EMI. |
| 1RS–8RS | Kelvin current sense inputs | High-precision sense path for 0.5-Ω external current-sense resistors; sets overcurrent/undercurrent thresholds and classification levels. |
| SDA_I / SDA_O | Isolated I²C data lines | Separate input and open-drain output enable opto-coupler-based I²C isolation - maintains Ethernet port ground separation from controller ground. |
| L1–L8 | Tri-state LED drivers | Individually controllable outputs for dual-color status LEDs; support 10-mA sink/source; default to high-impedance at reset. |
| INTB | Open-drain fault interrupt | Active-low signal asserted when any port detects UV/OV/OC/fault - enables immediate host MCU response without polling. |
| A1–A5 | I²C address select inputs | Binary-selectable slave address; supports up to 32 devices on one I²C bus - essential for multi-chip PSE systems managing 256+ ports. |
Key Features
| Feature | Design Value |
|---|---|
| Opto-coupler compatible I²C | Separated SDA_I and SDA_O pins eliminate need for external bus buffers - simplifies isolated controller interface and meets safety isolation requirements. |
| Per-port 12-bit A/D acquisition | Real-time measurement of port current, voltage, discovery resistance, and classification current - enables closed-loop diagnostics and firmware-based fault analysis. |
| Programmable classification bypass | Configurable per-port write registers allow skipping classification phase - reduces power-up time for known PDs or non-standard applications. |
| Dual-point 25-kΩ discovery | Resistive detection with built-in slope measurement rejects steering diodes - ensures reliable identification of IEEE-compliant PDs even with front-end protection circuits. |
| Capacitive legacy load detection | Uses integrated A/D to measure load capacitance - enables safe powering of non-802.3af devices (e.g., older VoIP phones) without damaging them. |
| Controlled di/dt power ramping | CR capacitor-based linear ramp control limits inrush current - satisfies 802.3af EMI requirements and prevents bulk capacitor stress during PD startup. |
Applications
| Enterprise PoE Switches | Industrial Mid-Span Injectors |
|---|---|
Use Scenario: 24- or 48-port managed Ethernet switch delivering power to IP cameras, wireless APs, and VoIP phones across factory floors or office buildings. IC Role / Device Role / Timing Role: Centralized PSE manager coordinating eight ports per TPS2383BPMRG4 IC; handles discovery, classification, and fault recovery under host MCU supervision. Use Value: Enables scalable, UL-certifiable PoE infrastructure with real-time per-port current/voltage telemetry and hardware-level fault interrupts - reducing firmware complexity and improving system reliability. |
Use Scenario: Standalone 8-port PoE injector deployed between legacy non-PoE switches and powered endpoints in security or building automation systems. IC Role / Device Role / Timing Role: Full-function PSE controller implementing all IEEE 802.3af physical layer functions - including capacitive legacy detection and dual-color LED status indication. Use Value: Eliminates need for discrete comparator/timer circuits; integrates discovery, classification, ramp control, and monitoring into single IC - lowering BOM cost and PCB area vs. discrete solutions. |
| Smart Building Controllers | Medical Network Devices |
Use Scenario: Integrated building management system powering environmental sensors, access control readers, and lighting controllers over structured cabling. IC Role / Device Role / Timing Role: Octal PSEPM providing isolated, monitored power delivery with configurable classification thresholds for mixed-device deployments. Use Value: Supports custom power classes and legacy device compatibility - ensuring interoperability with diverse endpoint vendors while maintaining strict safety compliance (IEC950/UL). |
Use Scenario: Patient-monitoring hub supplying power and data to bedside devices in hospitals where electrical safety and EMI immunity are critical. IC Role / Device Role / Timing Role: Safety-certified PSE controller with hardware UV/OV/OC protection, controlled ramp-down, and opto-isolated I²C - meeting medical-grade isolation requirements. Use Value: Reduces risk of patient-connected equipment damage during power faults; provides deterministic fault response without software dependency - enhancing system safety assurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Power Sourcing Equipment Manager applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2384PWR | Quad-port variant in TSSOP-48; lacks dual SDA lines and LED drivers; lower integration density. | Suitable for space-constrained 4-port designs where opto-isolation is not required and LED status is handled externally. | Select when port count is ≤4 and system-level isolation is implemented outside the PSE IC. |
| MAX5980GTJ+ | 8-port PSE controller with integrated MOSFET drivers; no external FET requirement; different I²C register map and timing. | Used in compact, low-component-count PoE switches where board space and external FET layout complexity must be minimized. | Choose when eliminating external high-side/low-side MOSFETs and gate drive circuitry is prioritized over field-proven TI ecosystem support. |
Compared with TPS2383BPMRG4, TPS2384PWR offers reduced channel count and no opto-isolation capability but smaller footprint, while MAX5980GTJ+ integrates power switches at the cost of less flexible thermal management and vendor-specific firmware adaptation.
Availability
TPS2383BPMRG4 is available at Aetrix Electronics and suitable for enterprise PoE switches, industrial mid-span injectors, and smart building controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical infrastructure.
Supply support for TPS2383BPMRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with decades of PoE innovation and broad industrial qualification.
The TPS2383BPMRG4 belongs to TI's Power over Ethernet PSE Manager product line, designed specifically for scalable, standards-compliant, multi-port Ethernet power infrastructure in switches, injectors, and controllers.
FAQ
What is the primary function of the TPS2383BPMRG4 in a PoE system?
The TPS2383BPMRG4 serves as an IEEE 802.3af-compliant octal Power Sourcing Equipment Manager (PSEPM) IC. It performs per-port discovery, classification, and controlled power delivery to Powered Devices over Ethernet cabling. The TPS2383BPMRG4 does not integrate power switches - it drives external N-channel MOSFETs and provides real-time 12-bit current/voltage telemetry, hardware fault interrupts, and opto-isolated I²C control - making it ideal for scalable, safety-certified PoE infrastructure.
Does the TPS2383BPMRG4 support legacy (non-802.3af) device detection?
Yes, the TPS2383BPMRG4 supports capacitive detection mode for identifying legacy loads that lack the standard 25-kΩ discovery signature. In this mode, its integrated 12-bit A/D converter measures load capacitance during the discovery phase. This capability allows safe powering of older VoIP phones or other non-compliant devices without risking damage - a feature explicitly documented in the SLUS565G datasheet Section "APPLICATION INFORMATION".
How does the TPS2383BPMRG4 achieve ground isolation for the I²C interface?
The TPS2383BPMRG4 achieves ground isolation via separate SDA_I (input) and SDA_O (open-drain output) pins, enabling direct connection to opto-coupler LEDs without external level shifters. The SDA_O pin can drive opto-couplers directly from the +48-V bus using an external current-limiting resistor, while SDA_I receives isolated logic signals - preserving Ethernet port ground separation. This architecture is confirmed in the "TERMINAL FUNCTIONS" table and "I2C INTERFACE" section of the official datasheet.
What external components are mandatory for basic TPS2383BPMRG4 operation?
Mandatory external components for the TPS2383BPMRG4 include: eight N-channel MOSFETs (one per port), eight 0.5-Ω current-sense resistors (RS pins), one 665-Ω discovery resistor (RD pin), one 120-kΩ timing resistor (RT pin), one 0.1-µF CR capacitor, one 100–470-pF CT capacitor, one 0.033-µF CINT capacitor, and local 0.1-µF decoupling capacitors on V48, V5, VL, and V10. These values are specified in the "RECOMMENDED OPERATING CONDITIONS" and "DEVICE INFORMATION" sections of the SLUS565G datasheet.
Can the TPS2383BPMRG4 operate without a 48-V supply present?
Yes - the TPS2383BPMRG4 supports partial operation with only the 3.3-V digital supply (VL) active, even when V48 is absent. This allows the host controller to access I²C registers, configure settings, and monitor status before applying 48-V power. The 5-V analog supply (V5) is required for LED drivers and analog functions, but both VL and V5 can be derived from V48 using minimal external circuitry, as noted in the "DESCRIPTION" section of the SLUS565G datasheet.
TPS2383BPMRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Controller (PSE)
- Number of Channels:
- 8
- Power - Max:
- 15.4 W
- Internal Switch(s):
- No
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 44V ~ 57V
- Current - Supply:
- 5mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP (10x10)
TPS2383BPMRG4 FAQ
1.How can I place an order for TPS2383BPMRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2383BPMRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS2383BPMRG4 reliable?
The price and inventory of TPS2383BPMRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2383BPMRG4 is usually 5 days.
3.What payment methods are accepted for TPS2383BPMRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2383BPMRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2383BPMRG4?
TPS2383BPMRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2383BPMRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS2383BPMRG4?
For technical support, including TPS2383BPMRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2383BPMRG4 requirements.
6.How does Aetrix verify that TPS2383BPMRG4 is sourced from the original manufacturer or authorized distributors?
All TPS2383BPMRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS2383BPMRG4 meets industry standards.
7.What is the process for return or replacement of TPS2383BPMRG4?
All TPS2383BPMRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS2383BPMRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS2383BPMRG4 part is unused and in its original packaging.
Return procedure for TPS2383BPMRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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