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Texas Instruments TPS2388RTQT
- Part No.:
- TPS2388RTQT
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
TPS2388RTQT.pdf
- Description:
- IC POE CNTRL 8 CHANNEL 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:431
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Product details
Overview
TPS2388RTQT from Texas Instruments is an IEEE 802.3at-compliant 8-channel Power-over-Ethernet (PoE) power sourcing equipment (PSE) controller that manages external N-channel MOSFETs to deliver up to 30 W per port. It features 4-point PD detection, Type 1/2 classification, programmable current limit with foldback, and 14-bit port current/voltage monitoring with ±2% sensing accuracy using a 0.255-Ω Kelvin-sense resistor. It is deployed in enterprise switches supporting IEEE-compliant PoE+ infrastructure.
For engineers reviewing the TPS2388RTQT datasheet, TPS2388RTQT pinout, TPS2388RTQT application, or TPS2388RTQT equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, and validated alternative PSE controllers for PoE+ system design, migration, and thermal-aware FET drive optimization.
Technical Context
The TPS2388RTQT implements a fully autonomous 4-point detection sequence-measuring VPWR-to-DRAINn voltage while sinking dual current levels-to reject legacy capacitive loads and avoid false powering. Its external FET architecture decouples thermal management from the IC, enabling scalable 8-port designs with independent gate drive (GAT1–GAT8) and Kelvin-sense current monitoring (SEN1–SEN8 with KSENSA–KSENSD).
It supports three operating modes: semiauto (auto-detect/classify/enable), manual (host-controlled sequencing), and fast shutdown via OSS input with 1- or 3-bit priority encoding. Integrated I²C interface includes watchdog timer, 8-/16-bit register access, and separate SDAI/SDAO lines for opto-isolated control-critical for safety-isolated PoE systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3at-2012 (PoE+) for 8 ports, including Type 1 (15.4 W) and Type 2 (30 W) PD classification. |
| Port Count | 8 independent PoE channels with dedicated DRAINn, GATn, SENn, and KSENSx pins per port. |
| Current Sensing | ±2% accuracy over 7.5 mA–770 mA using integrated 14-bit ADC and 0.255-Ω Kelvin-sense resistors. |
| Gate Drive | 8 open-drain gate drivers (GAT1–GAT8) capable of sinking ≥100 mA to rapidly turn off external N-MOSFETs during faults. |
| Operating Temp | –40°C to +125°C junction temperature range, qualified for industrial and telecom infrastructure environments. |
| I²C Interface | Standard-mode (10–400 kHz) with watchdog timeout (1.1–3.3 s), separate SDAI/SDAO for isolation, and A1–A4 address pins. |
| Package | VQFN-56 (8.0 mm × 8.0 mm), thermally enhanced with exposed pad tied to AGND/DGND for ≤25.3°C/W θJA. |
Pinout & Package
VQFN-56 package (8.0 mm × 8.0 mm) with exposed thermal pad requiring low-impedance connection to both AGND and DGND planes for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GAT1–GAT8 | Port gate drive output | Drives external N-MOSFET gates; sinks ≥100 mA to force rapid FET turn-off during overload or shutdown. |
| SEN1–SEN8 | Current sense input | Differential input referenced to KSENSA–KSENSD; interfaces with 0.255-Ω sense resistor for foldback and monitoring. |
| DRAIN1–DRAIN8 | Port voltage monitor & detect node | Measures VPWR-to-port voltage for detection, power-good, and foldback; hosts internal 80–190 kΩ pull-up to VPWR. |
| KSENSA–KSENSD | Kelvin sense reference | Shared Kelvin return for two adjacent SEN pins (e.g., KSENSA for SEN1/SEN2); minimizes PCB trace resistance error. |
| OSS | Fast shutdown input | Active-high, deglitched input enabling priority-based per-port shutdown with 1-bit (immediate) or 3-bit (8-level) encoding. |
| INT | Interrupt output | Open-drain signal asserting low on fault events (e.g., overcurrent, DC disconnect, classification failure). |
| SCL / SDAI / SDAO | I²C bus interface | Separate SDAI (input) and SDAO (open-drain output) enable galvanic isolation; SCL supports 400 kHz max clock. |
| VPWR | Analog 48-V supply input | Nominally 44–57 V; powers analog circuitry and external FETs; requires 0.1 µF bypass to AGND. |
| VDD | Digital 3.3-V supply | 3.0–3.6 V logic supply; internally regulated UVLO thresholds at 2.25 V (falling) and 2.6 V (rising). |
| RESET | Active-low reset input | Resets all ports and registers; includes 1–5 µs deglitch filter and internal POR independent of external assertion. |
Key Features
| Feature | Design Value |
|---|---|
| "Never Fooled" 4-point detection | Rejects >100 kΩ open circuits and <360 Ω shorts while distinguishing valid PD signatures from legacy/capacitive loads. |
| Programmable current foldback | Reduces ILIM threshold dynamically during inrush or overload-e.g., from 770 mA to 230 mA-lowering MOSFET thermal stress. |
| 100-ms rolling current averaging | Enables stable load monitoring and accurate power budgeting across all 8 ports without host CPU polling overhead. |
| I²C watchdog with fail-safe mode | Auto-resets internal state if I²C communication stalls longer than 1.1–3.3 s, preventing uncontrolled port power states. |
| Port remapping capability | Allows flexible PCB layout by reassigning logical port numbers to physical pins-simplifying migration from prior TI PSE devices. |
Applications
| Enterprise Switches | Network Video Recorders |
|---|---|
|
Use Scenario: 24- or 48-port managed Ethernet switch delivering PoE+ to IP phones, wireless APs, and security cameras. IC Role / Device Role / Timing Role: Centralized PSE controller managing eight concurrent PoE channels with real-time current/voltage telemetry and priority-based shutdown. Use Value: Enables IEEE-compliant 30 W delivery per port with ±2% current measurement accuracy-critical for accurate power budgeting and thermal derating in dense chassis designs. |
Use Scenario: Rack-mounted NVR supplying power and data to 8–16 PoE-enabled PTZ cameras with motion-triggered recording. IC Role / Device Role / Timing Role: Eight-channel PSE managing camera power sequencing, DC disconnect detection, and fast shutdown during video analytics overload events. Use Value: 100-ms rolling current averaging and 14-bit ADC support precise per-camera load profiling-enabling dynamic power capping without service interruption. |
| PoE Pass-Through Modules | SoHo Routers |
|
Use Scenario: Midspan PoE injector module converting non-PoE uplink to 8-port PoE+ output for distributed office deployments. IC Role / Device Role / Timing Role: Standalone PSE controller interfacing with isolated MCU via I²C; handles full detection-classification-power-on sequence autonomously. Use Value: External FET architecture allows selection of cost-optimized 60-V MOSFETs while maintaining 30 W/port capability-reducing BOM cost vs. integrated solutions. |
Use Scenario: Small-office/home-office router with 4–8 PoE ports powering VoIP phones and IoT gateways in space-constrained enclosures. IC Role / Device Role / Timing Role: Compact 8-channel PSE implementing semiauto mode with minimal host intervention and thermal-aware foldback protection. Use Value: VQFN-56 package with shared thermal pad simplifies 2-layer PCB layout-reducing layer count and manufacturing cost in cost-sensitive SoHo platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel PoE+ PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23861RGET | 4-channel PoE+ controller in VQFN-32; lacks port remapping, 3-bit OSS, and 100-ms averaging; lower integration density. | Suitable for compact 4-port switches or cost-optimized midspans where 8-channel density is unnecessary. | Select when board space or channel count permits reduction-avoids overdesign but requires two ICs for 8 ports. |
| MAX5988BETM+ | 8-channel PoE+ PSE with integrated MOSFET drivers (no external FETs required); smaller 56-pin TQFN; no Kelvin sensing or 14-bit ADC. | Better suited for space-constrained, lower-power (<25 W/port) applications where thermal dissipation is managed on-die. | Choose when external FET complexity must be eliminated-accepts trade-offs in sensing accuracy (±5%) and thermal scalability. |
Compared with TPS2388RTQT, TPS23861RGET halves channel count and removes advanced telemetry, while MAX5988BETM+ integrates FET drivers at the expense of sensing precision and thermal headroom-making TPS2388RTQT optimal for high-density, high-accuracy, thermally demanding PoE+ infrastructure.
Availability
TPS2388RTQT is available at Aetrix Electronics and suitable for enterprise switching, network video recording, and PoE pass-through modules requiring stable component supply, long-term lifecycle assurance, and full IEEE 802.3at compliance verification.
Supply support for TPS2388RTQT 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 broad industrial and communications portfolio coverage.
The TPS2388RTQT belongs to TI's Power-over-Ethernet PSE controller product line, engineered specifically for high-channel-count, thermally robust, and standards-compliant PoE+ infrastructure-targeting enterprise switches, NVRs, and carrier-grade midspans.
FAQ
What is the primary function of the TPS2388RTQT in a PoE system?
The TPS2388RTQT serves as an 8-channel IEEE 802.3at-compliant power sourcing equipment (PSE) controller. It detects, classifies, and safely powers IEEE-compliant powered devices (PDs) over Ethernet cables using external N-channel MOSFETs. Its core function includes 4-point detection, Type 1/2 classification, current foldback, and real-time 14-bit port monitoring-all coordinated via I²C. The TPS2388RTQT does not integrate power FETs but drives them externally to optimize thermal, efficiency, and cost trade-offs in high-density systems.
Does the TPS2388RTQT support both PoE and PoE+ standards?
Yes, the TPS2388RTQT fully supports IEEE 802.3at-2012 (PoE+), delivering up to 30 W per port. It also supports legacy IEEE 802.3af (PoE) through backward-compatible Type 1 classification (up to 15.4 W). The device performs two-event physical-layer classification for Type 2 and single-event for Type 1, and its "Never Fooled" 4-point detection reliably distinguishes valid PDs from non-compliant or capacitive loads-ensuring interoperability across both standards without firmware changes.
How does the current foldback feature work in the TPS2388RTQT?
The TPS2388RTQT implements current foldback by dynamically reducing the ILIM threshold based on measured port voltage (VPWR – DRAINn). During inrush or overload, if port voltage drops below a threshold-e.g., due to short-circuit-the foldback engine lowers the current limit from nominal 770 mA to as low as 230 mA. This reduces power dissipation in the external MOSFET, mitigating thermal stress and enabling use of lower-cost FETs. Foldback is active during startup and sustained faults, and is calibrated for the 0.255-Ω sense resistor used with KSENSx inputs.
Can the TPS2388RTQT operate with isolated I²C communication?
Yes, the TPS2388RTQT supports isolated I²C via dedicated SDAI (input) and SDAO (open-drain output) pins-eliminating the need for bidirectional isolators. An external optocoupler or digital isolator can be placed between host MCU and these lines, with SDAO requiring only a pull-up resistor on the isolated side. This architecture enables safe, noise-immune communication in high-voltage PoE systems where ground separation between controller and host is mandatory for safety certification.
What is the role of the KSENSA–KSENSD pins on the TPS2388RTQT?
KSENSA–KSENSD are Kelvin sense reference terminals that provide differential return paths for current measurement: KSENSA serves SEN1/SEN2, KSENSB serves SEN3/SEN4, KSENSC serves SEN5/SEN6, and KSENSD serves SEN7/SEN8. They enable true 4-wire sensing across the 0.255-Ω shunt resistors-rejecting voltage drop errors from PCB trace resistance. Proper layout (short, matched traces from shunt to KSENS/SEN) is essential to achieve the specified ±2% current sensing accuracy across the full 7.5 mA–770 mA range in the TPS2388RTQT.
TPS2388RTQT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PSE)
- Number of Channels:
- 8
- Power - Max:
- 670 mW
- Internal Switch(s):
- No
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE)
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-QFN (8x8)
TPS2388RTQT FAQ
1.How can I place an order for TPS2388RTQT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2388RTQT 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 TPS2388RTQT reliable?
The price and inventory of TPS2388RTQT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2388RTQT is usually 5 days.
3.What payment methods are accepted for TPS2388RTQT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2388RTQT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2388RTQT?
TPS2388RTQT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2388RTQT 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 TPS2388RTQT?
For technical support, including TPS2388RTQT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2388RTQT requirements.
6.How does Aetrix verify that TPS2388RTQT is sourced from the original manufacturer or authorized distributors?
All TPS2388RTQT 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 TPS2388RTQT meets industry standards.
7.What is the process for return or replacement of TPS2388RTQT?
All TPS2388RTQT units undergo pre-shipment inspection (PSI). If there is an issue with TPS2388RTQT, 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 TPS2388RTQT part is unused and in its original packaging.
Return procedure for TPS2388RTQT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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