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Texas Instruments TPS2383APM
- Part No.:
- TPS2383APM
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 64-LQFP
- Datasheet:
-
TPS2383APM.pdf
- Description:
- IC POE CNTRL 8 CHANNEL 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
TPS2383APM from Texas Instruments is a Power Sourcing Equipment Power Manager (PSEPM) IC compliant with IEEE 802.3af PoE standard, designed for mid-span injectors and Ethernet switches. It supports up to eight PoE ports, delivers 44–57 V input, provides 12-bit per-port current/voltage acquisition, and features dual-color LED drivers and I²C slave interface with 5-bit address selectability.
For engineers reviewing the TPS2383APM datasheet, TPS2383APM pinout, TPS2383APM application, or TPS2383APM equivalent, this device enables precise discovery, classification, and controlled power delivery to IEEE 802.3af-compliant Powered Devices while supporting legacy load detection, EMI-reduced di/dt ramping, and real-time fault monitoring across all eight ports.
Technical Context
The TPS2383APM implements a master sequencer architecture that cycles through eight independent port state machines, coordinating shared analog resources-including a 12-bit A/D converter, ramp control circuitry (CR/CT/CINT), and discovery/classification voltage loops-to manage per-port discovery (25-kΩ resistor + capacitive detection), classification (17.5 V, 12-bit current measurement), and power delivery.
It uses external N-channel MOSFETs for low-RDS(on) switching of the −48 V return path, with gate drive derived from the 48-V bus; internal bias generation (V10 = 10 V ±0.75 V) and dual supply domains (VL = 3.3 V, V5 = 5 V) enable operation during 48-V absence and support opto-isolated I²C via SDA_O's high-voltage open-drain output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Standard | Compliant with IEEE 802.3af for PoE discovery, classification, and power delivery. |
| Port Count | Manages up to 8 independent Ethernet ports with individual status and control registers. |
| Input Voltage Range | 44 V to 57 V on V48 pin-supports standard PoE mid-span and switch applications. |
| A/D Resolution | 12-bit per-port acquisition for real-time current (±0.5 mA LSB) and voltage (33.6 counts/V). |
| I²C Interface | Standard slave-mode I²C with 5-bit address select (A1–A5), 400 kHz max clock, and opto-coupler-compatible SDA_O. |
| Power Ramp Control | Controlled di/dt ramp-up/down using CR capacitor (0.1 µF) to limit EMI during PD power-on/off. |
| Fault Detection | Detects UVLO (30–38 V), port UV/OV (40–44 V / 56–63 V), overcurrent (≥375 mA avg), undercurrent (≤10 mA avg), and disconnect events. |
Pinout & Package
The TPS2383APM is housed in a 64-pin LQFP (PM package) with exposed thermal pad, rated for −40°C to +85°C ambient operation and 65°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V48 (Pin 27) | +48 V Input Supply | Main PoE power rail input; accepts 44–57 V; decoupled to AG2 with 0.1 µF capacitor. |
| 1P–8P (Pins 1,8,9,16,33,40,41,48) | Port Positive Sense | High-side sense inputs for differential voltage monitoring across each PoE port. |
| 1N–8N (Pins 2,7,10,15,34,39,42,47) | Port Negative Sense | Low-side return sense inputs; connect to external N-MOSFET source for switched −48 V path. |
| 1G–8G (Pins 3,6,11,14,35,38,43,46) | N-MOSFET Gate Drive | Linear current amplifier outputs driving external N-channel MOSFET gates up to 10 V. |
| 1RS–8RS (Pins 4,5,12,13,36,37,44,45) | Kelvin Current Sense Input | High-side kelvin sense for 0.5 Ω current-sense resistor; sets over/undercurrent thresholds. |
| SCL_I (Pin 55), SDA_I (Pin 58), SDA_O (Pin 57) | I²C Serial Interface | SCL_I/SDA_I: standard bidirectional I²C lines; SDA_O: HV open-drain output for opto-isolation. |
| L1–L8 (Pins 17–24) | Dual-Color LED Driver | Tri-state outputs supporting single/dual-color LEDs for per-port status indication. |
| A1–A5 (Pins 64,63,62,61,60) | I²C Address Select | Binary address inputs enabling up to 32 devices on one I²C bus (32 × 8 = 256 ports). |
Key Features
| Feature | Design Value |
|---|---|
| Two-point 25-kΩ discovery | Enables robust PD detection even with series steering diodes at the PD end, meeting IEEE 802.3af requirements. |
| Capacitive legacy load detection | Uses integrated A/D to identify non-802.3 devices by capacitance signature-no false triggering on passive loads. |
| Controlled di/dt power ramp | Reduces EMI during PD power-up/down via CR capacitor-based linear current slew (ramp time programmable). |
| Per-port 12-bit A/D acquisition | Delivers real-time port current (236–1416 counts @ 50–300 mA) and voltage (168–1512 counts @ 5–45 V) data via I²C read registers. |
| Hardware FAULT interrupt (INTB) | Open-drain active-low signal asserts immediately on any port fault (UV/OV/OC/disconnect), enabling fast system-level response. |
| Opto-coupler compatible SDA_O | Drives opto-LED directly from 48-V bus with external current-limiting resistor-enables ground-isolated I²C communication. |
Applications
| Mid-Span PoE Injector | Managed Ethernet Switch |
|---|---|
|
Use Scenario: Adds PoE capability to non-PoE network switches by injecting power onto spare Ethernet pairs between switch and endpoint. IC Role / Device Role / Timing Role: TPS2383APM acts as the PSE controller managing up to eight 48-V power channels, performing discovery, classification, and fault-protected delivery per IEEE 802.3af. Use Value: Enables compact, thermally efficient mid-span designs using low-RDS(on) external MOSFETs and eliminates need for isolated 3.3-V/5-V supplies via internal V10 generation. |
Use Scenario: Integrated into enterprise or industrial Ethernet switches requiring per-port PoE management, remote monitoring, and dynamic power budgeting. IC Role / Device Role / Timing Role: TPS2383APM serves as the core PSEPM engine, coordinating eight ports via I²C with an MSP430 or similar microcontroller for centralized firmware control. Use Value: Provides real-time 12-bit current/voltage telemetry per port-supporting intelligent power allocation, predictive maintenance, and compliance logging without external ADCs. |
| Industrial IoT Gateway | Smart Building Controller |
|
Use Scenario: Powers IP cameras, wireless APs, and sensors in factory-floor or outdoor deployments where reliability and fault resilience are critical. IC Role / Device Role / Timing Role: TPS2383APM executes autonomous port sequencing, UV/OV/OC protection, and disconnect detection-even during microcontroller reset or communication loss. Use Value: Ensures continuous PoE service with hardware-level fault isolation (INTB) and automatic recovery, reducing downtime in mission-critical infrastructure. |
Use Scenario: Embedded in building automation panels powering VoIP phones, access control readers, and environmental sensors across large-scale LANs. IC Role / Device Role / Timing Role: TPS2383APM manages power budgets per port, enforces Class 0–4 classification limits, and drives dual-color LEDs for visual status reporting to facility technicians. Use Value: Simplifies field diagnostics and commissioning via LED feedback and eliminates manual configuration-each port's behavior is fully software-defined via I²C registers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PSE management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2384PWR | 8-port PSE controller with integrated 100-V N-MOSFET drivers; no external FET required; higher quiescent current (12 mA vs. 5 mA in powered mode). | Reduces BOM count and layout complexity but sacrifices thermal flexibility and discrete FET optimization for high-density systems. | Choose TPS2384PWR when board space is constrained and integrated FET performance meets system RDS(on) and thermal targets. |
| MAX5974AETJ+ | 4-port PoE PSE controller with integrated 75-V MOSFET drivers; supports IEEE 802.3af/at; lower channel count and different I²C register map. | Targets cost-sensitive, lower-port-count applications; lacks 8-port scalability and dual-color LED drivers of TPS2383APM. | Choose MAX5974AETJ+ only when 4-port capacity suffices and TI's ecosystem (e.g., MSP430 reference code) is not required. |
Compared with TPS2384PWR and MAX5974AETJ+, the TPS2383APM offers unmatched 8-port scalability with external MOSFET flexibility, lowest system-level power dissipation via optimized FET selection, and full IEEE 802.3af feature parity-including legacy capacitive detection and opto-isolated I²C-making it ideal for high-reliability, field-deployable PoE infrastructure.
Availability
TPS2383APM is available at Aetrix Electronics and suitable for mid-span injectors, managed Ethernet switches, and industrial IoT gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing for production volumes.
Supply support for TPS2383APM 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 leadership in power management and industrial communications ICs.
The TPS2383APM belongs to TI's Power over Ethernet (PoE) PSE controller product line, engineered specifically for scalable, standards-compliant, and fault-resilient Ethernet infrastructure equipment operating in demanding commercial and industrial environments.
FAQ
What is the primary function of the TPS2383APM in a PoE system?
The TPS2383APM functions as a Power Sourcing Equipment Power Manager (PSEPM) IC that discovers, classifies, and safely delivers power to IEEE 802.3af-compliant Powered Devices across up to eight Ethernet ports. It performs real-time current/voltage monitoring, fault detection (UV/OV/OC), and controlled di/dt power ramping-all coordinated via an I²C interface. The TPS2383APM does not deliver power directly but controls external N-channel MOSFETs to switch the −48 V return path.
Does the TPS2383APM require external MOSFETs, and why?
Yes, the TPS2383APM requires external N-channel MOSFETs connected to its 1G–8G gate drive pins. This architecture allows designers to select low-RDS(on) FETs optimized for thermal performance and system-level efficiency-critical in high-port-count or enclosed applications. The TPS2383APM generates up to 10 V gate drive from the 48-V bus, ensuring full enhancement of cost-effective discrete FETs without needing a separate high-voltage supply.
How does the TPS2383APM support legacy (non-802.3af) device detection?
The TPS2383APM supports legacy load detection via capacitive signature measurement using its integrated 12-bit A/D converter and shared analog resources. When enabled via register configuration, it applies low-level probe signals and measures the resulting capacitive response-distinguishing legacy devices (e.g., analog phones) from short circuits or open cables without risking damage. This complements its standard two-point 25-kΩ resistive discovery method.
Can the TPS2383APM operate without the 48-V supply present?
Yes-the TPS2383APM can remain partially functional with only VL (3.3 V) and V5 (5 V) supplies active, even when V48 is absent. In this state, the I²C interface, registers, and LED drivers remain accessible for configuration and status polling. However, port power delivery, discovery, classification, and fault monitoring are disabled until V48 rises above the 30–38 V UVLO threshold and stabilizes.
What is the role of the CR, CT, and CINT capacitors in the TPS2383APM?
CR (Pin 50) sets the di/dt ramp rate for controlled power-up/down; CT (Pin 52) and RT (Pin 31) set the internal clock frequency (100–500 kHz) governing state machines and timers; CINT (Pin 30) serves as the integration capacitor for the ramp A/D converter, directly affecting measurement accuracy of port current/voltage. All three must use specified values (e.g., CR = 0.1 µF, CT = 100–470 pF, CINT = 0.033 µF poly/Teflon) to meet IEEE 802.3af timing and precision requirements.
TPS2383APM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Bulk
- Product Status:
- Not For New Designs
- 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)
TPS2383APM FAQ
1.How can I place an order for TPS2383APM through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2383APM 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 TPS2383APM reliable?
The price and inventory of TPS2383APM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2383APM is usually 5 days.
3.What payment methods are accepted for TPS2383APM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2383APM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2383APM?
TPS2383APM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2383APM 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 TPS2383APM?
For technical support, including TPS2383APM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2383APM requirements.
6.How does Aetrix verify that TPS2383APM is sourced from the original manufacturer or authorized distributors?
All TPS2383APM 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 TPS2383APM meets industry standards.
7.What is the process for return or replacement of TPS2383APM?
All TPS2383APM units undergo pre-shipment inspection (PSI). If there is an issue with TPS2383APM, 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 TPS2383APM part is unused and in its original packaging.
Return procedure for TPS2383APM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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