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Texas Instruments TPS2371PWR
- Part No.:
- TPS2371PWR
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS2371PWR.pdf
- Description:
- IC INTERFACE SPECIALIZED 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,735
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Product details
Overview
TPS2371PWR from Texas Instruments is an IEEE 802.3af-compliant Power over Ethernet (PoE) powered device (PD) interface IC with integrated low-side FET, programmable inrush current limit, precision UVLO thresholds (35.0 V turn-on, 30.5 V turn-off), and 0.3-Ω RDS(on). It performs detection, classification (Class 0–4), and hot-swap control for VoIP phones and wireless access points.
For engineers reviewing the TPS2371PWR datasheet, TPS2371PWR pinout, TPS2371PWR application, or TPS2371PWR equivalent, key selection considerations include PoE classification resistor programming, EN_DC soft-start coordination with DC/DC converters, UVLO off-time delay via external capacitor, and thermal shutdown behavior at 144°C.
Technical Context
The TPS2371PWR implements a state-machine-driven PD interface: detection (1.8–10 V, 73 µA typical with 24.9-kΩ RDET), classification (15–20 V, fixed 10.0-V CLASS pin reference), inrush mode (>36 V, programmable via ILIM pin resistor), and normal operation (>30 V, 0.3-Ω FET conduction). It uses internal bandgap references and precision current sources for IEEE 802.3af compliance.
Its architecture integrates a 0.3-Ω low-side DMOS FET between RTN and VEE, controlled by UVLO hysteresis (4.5 V) and 20-ms off-time delay (CDELAY = 180 nF). The EN_DC pin sinks 80 µA until load voltage reaches within 1.5 V of VDD, enabling synchronized DC/DC soft-start without external UVLO circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 48 V to 57 V nominal; supports 36–57 V normal operation and 1.8–20 V detection/classification phases |
| UVLO Threshold | 35.0 V turn-on / 30.5 V turn-off; enables IEEE 802.3af legacy compatibility with 4.5-V hysteresis |
| Inrush Current Limit | Programmable 50–449 mA via ILIM pin resistor; removes 180-µF capacitor limitation per IEEE spec |
| FET RDS(on) | 0.3 Ω typical; minimizes power loss during full-load operation up to 455 mA |
| Classification Support | Class 0–4 via single RCLASS resistor (255 Ω to 4.42 kΩ); supports 0.44–12.95 W PoE power levels |
| Thermal Protection | 144°C shutdown with 20°C hysteresis; cycles 7 times then latches off under sustained overload |
| Package | TSSOP-8 (PW); 3.0 mm × 4.4 mm footprint, 1.2-mm height, RoHS-compliant, tape-and-reel (R suffix) |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65-mm lead pitch, 1.2-mm max height, exposed pad not present, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (1) | Inrush current programming | Resistor to VEE sets startup current limit (50–449 mA); requires 1.0-µF bypass to VEE for stable startup |
| CLASS (2) | PoE classification level setting | Resistor to VEE selects Class 0–4 (255 Ω to 4.42 kΩ); internal 10.0-V reference ensures accurate classification current |
| DET (3) | Detection signature generation | Connects 24.9-kΩ RDET to VDD; forms 25-kΩ detection signature across MDI pair during 1.8–10 V phase |
| VEE (4) | Negative supply reference | Power return for controller logic; referenced for all internal biasing and pin thresholds |
| RTN (5) | Load return path switch node | Drain of internal 0.3-Ω low-side FET; connects to DC/DC input return; carries full load current |
| EN_DC (6) | DC/DC converter enable/soft-start | Sinks 80 µA until VRTN reaches within 1.5 V of VDD; eliminates need for external UVLO on DC/DC controller |
| DELAY (7) | UVLO off-time delay timing | Capacitor to VDD sets 18-ms minimum off-time (CDELAY = 180 nF); prevents false shutdown during transient dips |
| VDD (8) | PoE input positive rail | Accepts 44–57 V PSE output; withstands 68 V absolute max; connects to RJ-45 MDI pair via barrel rectifier or direct |
Key Features
| Feature | Design Value |
|---|---|
| Integrated low-side FET | 0.3-Ω RDS(on) eliminates external MOSFET and reduces BOM count in PoE front-end designs |
| Programmable inrush limit | External ILIM resistor enables >180-µF input capacitance while meeting IEEE 802.3af 400-mA/50-ms requirement |
| EN_DC soft-start coordination | 80-µA current sink synchronizes DC/DC startup with PoE power ramp, preventing inrush-induced PSE disconnect |
| Full Class 0–4 support | Single-resistor classification with factory-trimmed 10.0-V CLASS reference ensures ±0.3-V accuracy across temperature |
| Thermal fault management | 144°C shutdown with 20°C hysteresis and 7-cycle retry before latch-off prevents damage during sustained overload |
Applications
| VoIP Phones | Wireless LAN Access Points |
|---|---|
Use Scenario: Powered via Category 5 Ethernet cable from PoE switch in enterprise office deployment. IC Role / Device Role / Timing Role: PD interface IC performing IEEE 802.3af detection, classification (Class 2), and hot-swap control of 5-V DC/DC converter input. Use Value: Enables single-cable deployment without local AC adapter; programmable inrush avoids PSE disconnect during boot-up with large hold-up capacitors. | Use Scenario: Indoor/outdoor Wi-Fi AP receiving power and data over same Ethernet link in campus network. IC Role / Device Role / Timing Role: PoE PD controller managing power sequencing, classification (Class 3), and thermal protection for dual-rail DC/DC stage. Use Value: Supports higher power (up to 12.95 W) for dual-band radios; EN_DC coordination ensures clean RF subsystem startup without voltage droop. |
| Bluetooth Access Points | Internet Appliances |
Use Scenario: Low-power Bluetooth mesh gateway deployed in smart building infrastructure with centralized PoE power. IC Role / Device Role / Timing Role: Class 0 PD interface providing detection signature and UVLO-controlled FET turn-on for 3.3-V LDO input. Use Value: Minimal 0.44-W classification current reduces PSE port loading; 12-µA sleep current enables accurate RDET sensing below 10 V. | Use Scenario: Networked digital signage or IP camera using PoE for simplified installation in retail environments. IC Role / Device Role / Timing Role: PoE front-end IC handling detection, classification (Class 3 or 4), and inrush limiting for high-capacitance DC/DC input. Use Value: Programmable ILIM allows >470-µF bulk capacitance for ride-through during brief PSE brownouts without violating IEEE limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE powered device interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2372PWR | Higher 0.25-Ω RDS(on), 150°C thermal shutdown, identical pinout and feature set | Better efficiency and thermal margin for continuous 455-mA loads; same PCB layout | Select when lower conduction loss or extended thermal headroom is required; drop-in replacement |
| LT4275IMS#PBF | Linear topology (no integrated FET), 12-V gate drive, requires external MOSFET, different pinout | Greater flexibility in FET selection and layout; higher board area and BOM cost | Choose when discrete FET optimization (e.g., ultra-low Qg) or custom thermal design is needed |
Compared with TPS2371PWR, TPS2372PWR offers lower RDS(on) and higher thermal shutdown threshold for improved efficiency in sustained high-current operation, while LT4275IMS#PBF provides design flexibility at the cost of added components and layout complexity.
Availability
TPS2371PWR is available at Aetrix Electronics and suitable for VoIP phones, wireless LAN access points, Bluetooth access points, and internet appliances requiring stable component supply across industrial and networking product lifecycles.
Supply support for TPS2371PWR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The TPS237x family is designed specifically for IEEE 802.3af PoE powered device front-ends, integrating detection, classification, inrush control, and hot-swap switching into compact TSSOP/SOIC packages.
FAQ
What is the function of the DELAY pin on the TPS2371PWR?
The DELAY pin on the TPS2371PWR programs the UVLO off-time delay using an external capacitor to VDD. With CDELAY = 180 nF, it provides a guaranteed 18-ms delay before turning off the internal FET after VDD drops below the UVLO turn-off threshold (30.5 V). This prevents nuisance shutdowns during brief input transients and ensures robust operation in noisy PoE environments. The TPS2371PWR datasheet specifies the exact timing equation and capacitor tolerance requirements.
How does the TPS2371PWR support IEEE 802.3af Class 3 operation?
The TPS2371PWR supports Class 3 operation by applying a precise 10.0-V reference to the CLASS pin during classification (15–20 V input range), allowing a 357-Ω resistor to ground to draw 28.4 mA - matching the IEEE 802.3af Class 3 specification. This current is measured by the PSE to allocate up to 12.95 W. The TPS2371PWR maintains this signature accurately across temperature and supply variations, ensuring reliable Class 3 recognition. The TPS2371PWR's internal reference and current source are factory-trimmed for ±0.3-V accuracy.
Can the TPS2371PWR be used with barrel rectifiers in the Ethernet line?
Yes, the TPS2371PWR is designed to operate with barrel rectifiers ahead of the RJ-45 connector. Its detection phase starts as low as 1.3 V across VDD–VEE, and classification is guaranteed to engage below 14 V - accommodating forward voltage drops from dual Schottky diodes. However, for Class 3 devices with long cables (e.g., 100-m, 20-Ω loop resistance) and minimum PSE voltage (15.5 V), marginal classification may occur; TI recommends using Schottky diodes or selecting Class 0 for such edge cases. The TPS2371PWR's internal architecture explicitly accommodates this use case per its datasheet.
What is the maximum continuous current the TPS2371PWR can deliver in normal operation?
The TPS2371PWR delivers up to 455 mA continuously in normal operation, defined as the full-load current limit where VRTN < 1.5 V. This value is specified at TA = 0°C to 70°C and accounts for thermal derating in the TSSOP-8 package (290 mW at 70°C ambient). Exceeding this current triggers current limiting, increasing power dissipation and potentially initiating thermal shutdown at 144°C. For sustained 455-mA loads, proper PCB copper area and thermal vias per TI's recommended land pattern are required. The TPS2371PWR's 0.3-Ω RDS(on) results in ≤63 mW conduction loss at this current.
How does the EN_DC pin interface with a DC/DC converter's soft-start function?
The EN_DC pin on the TPS2371PWR acts as a controlled current sink (80 µA typical) that holds the DC/DC converter's soft-start capacitor discharged until the load voltage (VRTN) reaches within 1.5 V of VDD. Once that threshold is met, the EN_DC pin transitions to high-impedance, releasing the soft-start capacitor to ramp normally. This ensures the DC/DC converter only begins regulation after PoE power is fully established, preventing inrush-related PSE disconnects. A 5-V zener diode between EN_DC and RTN is required for safe clamping. This behavior is intrinsic to the TPS2371PWR's internal state machine and requires no external logic.
TPS2371PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Power Interface Switch for Power Over Ethernet (PoE) Devices
- Interface:
- IEEE 802.3af
- Voltage - Supply:
- -
- Supplier Device Package:
- 8-TSSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
TPS2371PWR FAQ
1.How can I place an order for TPS2371PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2371PWR 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 TPS2371PWR reliable?
The price and inventory of TPS2371PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2371PWR is usually 5 days.
3.What payment methods are accepted for TPS2371PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2371PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2371PWR?
TPS2371PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2371PWR 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 TPS2371PWR?
For technical support, including TPS2371PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2371PWR requirements.
6.How does Aetrix verify that TPS2371PWR is sourced from the original manufacturer or authorized distributors?
All TPS2371PWR 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 TPS2371PWR meets industry standards.
7.What is the process for return or replacement of TPS2371PWR?
All TPS2371PWR units undergo pre-shipment inspection (PSI). If there is an issue with TPS2371PWR, 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 TPS2371PWR part is unused and in its original packaging.
Return procedure for TPS2371PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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