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Texas Instruments TPS2377PW
- Part No.:
- TPS2377PW
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS2377PW.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,858
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Product details
Overview
TPS2377PW from Texas Instruments is an IEEE 802.3af-compliant powered device (PD) controller for Power over Ethernet applications, integrating a 0.58-Ω low-side MOSFET switch, fixed 450-mA operational current limit, legacy UVLO thresholds (30.5 V turn-on / 35.1 V turn-off), and open-drain power-good reporting. It operates across –40°C to 85°C and supports VoIP phones, WLAN access points, and security cameras using TSSOP-8 packaging.
For engineers reviewing the TPS2377PW datasheet, TPS2377PW pinout, TPS2377PW application, or TPS2377PW equivalent, key selection considerations include its legacy UVLO behavior, inrush current programmability via ILIM pin, classification resistor interface, RTN-sinking capability up to 515 mA, and compatibility with silicon rectifier-based PD front-ends.
Technical Context
The TPS2377PW implements detection, classification, and undervoltage lockout functions using dedicated comparators with hysteresis, supporting IEEE 802.3af state transitions. Its internal 0.58-Ω MOSFET handles load switching while the ILIM pin accepts a resistor (62.5–500 kΩ) to set inrush current between 100–180 mA.
Classification is performed by sourcing current through an external resistor (255–4420 Ω) connected to CLASS, enabling IEEE-defined Class 0–4 identification. The PG output reports valid operation as an open-drain signal referenced to RTN, requiring external pull-up for logic-level interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Turn-On Threshold | 30.5 V nominal - enables downstream power delivery only after PSE voltage exceeds legacy PoE system minimum |
| UVLO Turn-Off Threshold | 35.1 V nominal - maintains operation during cable voltage sag, preventing premature shutdown |
| Operational Current Limit | 450 mA typical - sets maximum steady-state load current before thermal shutdown activates |
| Inrush Current Range | 100–180 mA with 178 kΩ ILIM resistor - limits capacitor charging surge to avoid PSE fault tripping |
| MOSFET rDS(on) | 0.58 Ω max at 300 mA - minimizes conduction loss in low-side power path |
| PG Output Type | Open-drain, RTN-referenced - allows flexible logic-level translation and fault signaling without internal pull-up |
| ESD Rating | 15-kV system-level contact/air - ensures robustness against handling and RJ-45 port surges per EN61000-4-2 |
Pinout & Package
TSSOP-8 package (PW suffix), 3.0 mm × 4.4 mm body, 0.65 mm pitch, exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Inrush current programming input | Resistor-to-VSS sets start-up surge limit; open or shorted condition disables inrush control |
| CLASS (Pin 2) | Classification current source | Sinks current through external resistor to signal IEEE 802.3af Class 0–4 power level to PSE |
| DET (Pin 3) | Detection signature generator | Pulls R(DET) to ground during detection phase to present 24.9-kΩ signature to PSE |
| VSS (Pin 4) | Input return reference | Source-side ground for controller bias; not connected to downstream load ground |
| RTN (Pin 5) | Switched load return | Sinks up to 515 mA; serves as current sense reference and PG output pulldown node |
| PG (Pin 6) | Power-good status indicator | Open-drain output asserted high when RTN is enabled and inrush complete; requires external pull-up |
| NC (Pin 7) | No connection | Unbonded pin; must remain unconnected per TI design |
| VDD (Pin 8) | Positive input supply | Accepts 0–57 V PoE input; powers internal circuitry and provides voltage monitoring for UVLO |
Key Features
| Feature | Design Value |
|---|---|
| Legacy UVLO thresholds | Optimized for interoperability with pre-802.3af PSEs operating below 44 V minimum output |
| Programmable inrush limiting | Enables use of large bulk capacitors while meeting PSE current-limit compliance during startup |
| Integrated 100-V low-side switch | Eliminates need for external MOSFET and gate driver in PoE PD front-end designs |
| IEEE 802.3af detection & classification | Fully implements mandatory signature generation and Class 0–4 current sourcing per standard |
| 15-kV system-level ESD protection | Validated per EN61000-4-2 on RJ-45 interface - reduces need for external TVS diodes |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Powered via Cat5e/6 cabling from enterprise PoE switch in office deployment. IC Role / Device Role / Timing Role: PD controller managing detection, classification, and power handoff to DC/DC converter and baseband processor. Use Value: Enables single-cable deployment with guaranteed 12.95 W input power budget and seamless PSE disconnect detection. | Use Scenario: Ceiling-mounted wireless AP drawing power from midspan injector in retail environment. IC Role / Device Role / Timing Role: Controls PoE interface sequencing and provides PG signal to enable RF subsystem only after stable power is established. Use Value: Prevents RF module brown-out during inrush and ensures reliable maintain-power-signature (MPS) transmission. |
| Security Cameras | POS Terminals |
Use Scenario: Outdoor IP camera powered over long cable runs (>75 m) with voltage drop compensation. IC Role / Device Role / Timing Role: Sinks RTN current while monitoring VDD for UVLO hysteresis margin; PG output enables image sensor only after full regulation. Use Value: Legacy UVLO thresholds ensure reliable startup even with 8–10 V cable drop, avoiding intermittent boot failures. | Use Scenario: Point-of-sale terminal deployed in multi-PD branch office with shared PoE switch budget. IC Role / Device Role / Timing Role: Implements Class 3 signature (357 Ω) to reserve 6.49–12.95 W from PSE, enabling local display and printer drivers. Use Value: Accurate classification prevents PSE power oversubscription and enables deterministic port allocation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar powered device controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2375PW | Fixed 802.3af-compliant UVLO (39.3 V on / 30.5 V off); higher hysteresis; no legacy mode | Better suited for new deployments with IEEE-compliant PSEs; less tolerant of slow-rising legacy inputs | Select TPS2375PW when designing for certified 802.3af infrastructure and requiring maximum hysteresis stability. |
| TPS2376PW | Adjustable UVLO via external resistor divider on UVLO pin; otherwise functionally identical to TPS2375 | Supports custom UVLO thresholds for nonstandard PSE voltages; adds one extra component and PCB footprint | Choose TPS2376PW only if precise UVLO tuning is required beyond TPS2377PW's legacy thresholds. |
Compared with TPS2375PW and TPS2376PW, the TPS2377PW offers optimized legacy UVLO behavior-lower turn-on voltage and reduced hysteresis-making it uniquely suitable for field-deployed PSEs that fall short of IEEE 802.3af minimum output specifications, without requiring external components or layout changes.
Availability
TPS2377PW is available at Aetrix Electronics and suitable for VoIP phones, WLAN access points, security cameras, and POS terminals requiring stable component supply across industrial temperature ranges and long-life PoE infrastructure programs.
Supply support for TPS2377PW 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 delivering analog and embedded processing solutions with leadership in power management, signal chain, and connectivity technologies.
The TPS237x family is designed specifically for IEEE 802.3af Power over Ethernet powered device interfaces, targeting cost-sensitive, space-constrained networked endpoints requiring integrated detection, classification, and power-switching functionality.
FAQ
What is the primary function of the TPS2377PW in a PoE system?
The TPS2377PW serves as a powered device (PD) controller that manages the IEEE 802.3af handshake sequence-detection, classification, and power application-for Ethernet-connected devices. It integrates a low-side MOSFET switch, UVLO circuitry with legacy thresholds, inrush current control, and open-drain power-good signaling. The TPS2377PW ensures safe, standards-compliant power delivery from a PSE while enabling downstream DC/DC conversion and system enablement.
How does the TPS2377PW differ from the TPS2375PW in UVLO behavior?
The TPS2377PW uses legacy UVLO thresholds (30.5 V turn-on / 35.1 V turn-off) optimized for older or noncompliant PSEs with lower output voltage capability, whereas the TPS2375PW implements full IEEE 802.3af thresholds (39.3 V turn-on / 30.5 V turn-off) with greater hysteresis. This makes the TPS2377PW more tolerant of voltage sag during startup but potentially less stable with slowly ramping compliant PSEs. Both share identical pinout, package, and functional architecture outside UVLO.
Can the TPS2377PW be used with a Class 4 PD configuration?
Yes, the TPS2377PW supports Class 4 operation using a 255-Ω classification resistor on the CLASS pin, which draws 38.0–41.2 mA during classification-within IEEE 802.3af Class 4 limits (36–44 mA). The device's 450-mA operational current limit and 0.58-Ω MOSFET support the corresponding 6.49–12.95 W input power range. No firmware or configuration change is needed; only the external resistor value determines class assignment.
What is the role of the ILIM pin on the TPS2377PW, and what resistor value is recommended?
The ILIM pin on the TPS2377PW sets the inrush current limit via an external resistor to VSS. A 178-kΩ ±1% resistor yields 100–180 mA inrush current, balancing compatibility with legacy PSEs and reliable bulk capacitor charging. Values between 62.5 kΩ and 500 kΩ are supported, with lower resistance increasing inrush. Leaving ILIM open or shorted disables inrush control and may cause PSE fault triggering during startup.
Does the TPS2377PW require an external pull-up resistor on the PG pin?
Yes, the PG pin on the TPS2377PW is an open-drain output referenced to RTN and requires an external pull-up resistor to a valid logic voltage (e.g., 3.3 V or 5 V) to generate a high-level signal when power is stable and inrush is complete. TI recommends a 10-kΩ pull-up for most applications. Without this resistor, PG remains floating and cannot drive downstream enable logic reliably.
TPS2377PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Controller (PD)
- Number of Channels:
- 1
- Power - Max:
- 12.95 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 0V ~ 57V
- Current - Supply:
- 240µA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
TPS2377PW FAQ
1.How can I place an order for TPS2377PW through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2377PW 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 TPS2377PW reliable?
The price and inventory of TPS2377PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2377PW is usually 5 days.
3.What payment methods are accepted for TPS2377PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2377PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2377PW?
TPS2377PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2377PW 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 TPS2377PW?
For technical support, including TPS2377PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2377PW requirements.
6.How does Aetrix verify that TPS2377PW is sourced from the original manufacturer or authorized distributors?
All TPS2377PW 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 TPS2377PW meets industry standards.
7.What is the process for return or replacement of TPS2377PW?
All TPS2377PW units undergo pre-shipment inspection (PSI). If there is an issue with TPS2377PW, 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 TPS2377PW part is unused and in its original packaging.
Return procedure for TPS2377PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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