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Texas Instruments TPS23751PWP
- Part No.:
- TPS23751PWP
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS23751PWP.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,746
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Product details
Overview
TPS23751PWP from Texas Instruments is a 16-pin IEEE 802.3at Type 2 Powered Device (PD) interface IC with integrated flyback DC-DC controller. It implements hardware classification, 0.5 Ω 100 V hot-swap MOSFET, programmable switching frequency (226–276 kHz), and synchronous rectifier disable for light-load efficiency. It powers up to 25.5 W PDs in VoIP phones and security cameras.
For engineers reviewing the TPS23751PWP datasheet, TPS23751PWP pinout, TPS23751PWP application, or TPS23751PWP equivalent, this page delivers verified pin functions, PoE interface timing behavior, flyback control loop parameters, thermal shutdown thresholds (135–155 °C), and real-world design meaning for classification resistor selection, APD threshold (1.43–1.57 V), and VFO/PWM transition control.
Technical Context
The TPS23751PWP integrates two tightly coupled subsystems: an IEEE 802.3at-compliant PoE interface with detection, classification, Type 2 hardware classification, and 140 mA inrush current limiting; and a current-mode flyback DC-DC controller featuring internal soft-start, slope-compensated PWM, blanking (100–200 ns), and variable-frequency operation (VFO) below 1.9 V CTL.
Its architecture enables robust power delivery across wide load ranges: the 0.5 Ω pass MOSFET supports continuous RTN current up to 825 mA at TJ ≤ 125 °C, while the VC bias supply (8.6–9.2 V UVLO) and VB 5 V regulator (±2.5%) stabilize gate drive and analog circuitry. Thermal shutdown (135–155 °C) and foldback current limiting protect during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Standard | Complies with IEEE 802.3at Type 2 PD requirements including hardware classification and Maintain Power Signature (MPS). |
| Max Continuous Power | 25.5 W - determined by 825 mA RTN current limit and 57 V input, enabling full-power operation in multiband access points. |
| Pass MOSFET RDS(on) | 0.20–0.75 Ω - low on-resistance minimizes conduction loss and thermal rise in PoE-powered devices. |
| Switching Frequency | 226–276 kHz (PWM mode); 105–165 kHz (VFO mode) - set via external RT resistor, enabling EMI optimization and transformer size reduction. |
| Classification Current Range | 1.8–29.3 mA - selectable via RCLS (63.4–1270 Ω), supporting Class 0–4 signatures per IEEE 802.3at. |
| APD Threshold | 1.43–1.57 V relative to ARTN - enables reliable auxiliary power switchover without false triggering from noise or leakage. |
| Thermal Shutdown | 135–155 °C with 20 °C hysteresis - ensures safe recovery after overtemperature events in enclosed enclosures. |
Pinout & Package
TPS23751PWP uses a 16-pin PowerPAD™ TSSOP (PWP) package measuring 5.00 mm × 4.40 mm, with exposed thermal pad connected to VSS for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | PoE input power rail connection | Bypassed with 0.1 µF to VSS; supplies both PoE interface and controller sections. |
| DEN | Detection/enable control input | Pull to VSS disables pass MOSFET; 24.9 kΩ to VDD enables detection. |
| CLS | Classification current programming | Resistor to VSS sets IEEE 802.3at class signature (e.g., 1270 Ω = Class 1). |
| APD | Auxiliary power detect input | Rising >1.5 V above ARTN disables MOSFET and asserts T2P - used for adapter ORing. |
| RT | Oscillator frequency setting | Resistor to ARTN programs switching frequency (e.g., 34 kΩ → 251 kHz nominal). |
| T2P | Type 2 PSE indicator output | Active-low open-drain signal confirms Type 2 PSE presence or APD activation. |
| SRD | Synchronous rectifier disable | Asserted in VFO mode to disable external SRs and reduce light-load losses. |
| CTL | PWM control loop input | Voltage-controlled duty cycle; 1.9–2.1 V transition point between PWM and VFO modes. |
| VB | 5 V bias supply output | Regulated 5 V ±2.5% for logic and sensing; requires ≥0.08 µF bypass to ARTN. |
| CS | Current sense input | ARTN-referenced input; 0.22–0.28 V threshold triggers current limiting. |
| VC | GATE driver bias supply | 12 V startup source (1.1–2.1 mA), 8.6–9.2 V UVLO; bypass ≥0.47 µF to ARTN. |
| GATE | External MOSFET gate driver | 0.35 A peak source / 1.0 A peak sink; 40 ns rise / 27 ns fall into 1 nF load. |
| ARTN | DC-DC analog return | Local ground reference for controller; must connect to RTN per datasheet note. |
| RTN | Pass MOSFET drain output | Delivers PoE power to downstream DC-DC primary; connects to ARTN and system ground. |
| VSS | Negative power rail | System ground return; PowerPAD™ must be soldered to VSS plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type 2 PoE interface | Hardware-based classification eliminates need for microcontroller-based software classification, reducing BOM and firmware complexity. |
| Programmable VFO/PWM transition | CTL voltage threshold (1.9–2.1 V) and SRT pin (0.5–1.5 V) allow precise control of efficiency vs. regulation trade-off at light loads. |
| Robust 100 V, 0.5 Ω hot-swap MOSFET | Enables direct connection to PoE lines without external FET, simplifying layout and improving surge immunity up to 15 kV air discharge. |
| Synchronous rectifier disable (SRD) | Reduces light-load losses by disabling external synchronous rectifiers when entering VFO mode - critical for battery-backup or low-idle applications. |
| Adapter ORing support | APD input enables seamless switchover between PoE and wall adapter power without brownout or reset events. |
Applications
| VoIP Telephones | Security Cameras |
|---|---|
Use Scenario: Powered via Ethernet cable in enterprise desk phones with LED indicators and audio processing. IC Role / Device Role / Timing Role: TPS23751PWP serves as the primary PoE PD interface and flyback controller, delivering regulated 5 V/12 V rails. Use Value: Enables single-cable deployment with 25.5 W headroom for high-fidelity audio codecs and display backlighting. | Use Scenario: Outdoor IP camera with IR illumination, motion detection, and video streaming. IC Role / Device Role / Timing Role: TPS23751PWP manages PoE classification, inrush limiting, and isolated flyback conversion for sensor and imaging subsystems. Use Value: Robust 100 V MOSFET withstands lightning-induced surges; thermal shutdown protects against enclosure overheating. |
| Multiband Access Points | Video Conferencing Systems |
Use Scenario: Dual-band 802.11ac Wi-Fi AP with multiple RF chains and USB peripherals. IC Role / Device Role / Timing Role: TPS23751PWP provides primary 24 V/12 V rails and enables adapter ORing for backup power. Use Value: Programmable frequency avoids interference with 2.4 GHz/5 GHz bands; APD input allows graceful fallback to wall adapter during PoE outage. | Use Scenario: All-in-one conference bar with camera, mic array, speaker, and HDMI output. IC Role / Device Role / Timing Role: TPS23751PWP supplies isolated power to analog audio front-end and digital SoC domains. Use Value: Low 0.5 Ω RDS(on) minimizes voltage drop across PoE cabling, ensuring stable 57 V input even at 80 m cable length. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23752PWP | 20-pin TSSOP with Sleep Mode, pulsed MPS generation, and additional SLPb/MODE/WAKE pins. | Required where IEEE 802.3at Maintain Power Signature must be sustained during ultra-low-power sleep states. | Select TPS23752PWP only if Sleep Mode functionality is mandatory; TPS23751PWP lacks SLPb and MODE pins and cannot generate MPS in sleep. |
| LT4275AIMSE#TRPBF | Linear Technology (Analog Devices) IEEE 802.3at PD interface with integrated DC-DC controller, 16-pin MSOP, 0.35 Ω RDS(on). | Offers lower RDS(on) and higher accuracy classification but no VFO mode or SRD output. | Choose LT4275AIMSE#TRPBF for tighter classification tolerance (<±2%) or lower conduction loss; TPS23751PWP provides superior light-load efficiency via VFO/SRD. |
Compared with TPS23752PWP, TPS23751PWP omits Sleep Mode circuitry and reduces pin count, lowering cost and PCB area for non-sleep applications; versus LT4275AIMSE#TRPBF, it trades slightly higher RDS(on) for integrated VFO control and synchronous rectifier management.
Availability
TPS23751PWP is available at Aetrix Electronics and suitable for VoIP telephony, security camera systems, multiband wireless access points, and video conferencing equipment requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for TPS23751PWP 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, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The TPS2375x product line was designed specifically to integrate IEEE 802.3at PoE PD interface functionality with optimized flyback DC-DC control, targeting space-constrained, high-efficiency powered devices in networking and surveillance applications.
FAQ
What is the maximum continuous current supported by the TPS23751PWP's internal MOSFET?
The TPS23751PWP's internal 100 V MOSFET supports up to 825 mA continuous current at junction temperature ≤125°C, as specified under Recommended Operating Conditions. This corresponds to ~25.5 W maximum delivered power assuming 57 V input. The device also features foldback current limiting and thermal shutdown (135–155°C) to protect against overload and ambient overheating conditions.
Does the TPS23751PWP support IEEE 802.3af (Type 1) or only 802.3at (Type 2)?
The TPS23751PWP supports IEEE 802.3at Type 2 only - it implements hardware-based Type 2 classification and requires a minimum 30.5–33.6 V UVLO falling threshold, which exceeds 802.3af's 12.5–15.5 V range. It does not support 802.3af Type 1 detection or classification. For dual-standard compatibility, TI recommends the TPS23753A or TPS2372-4.
How is the switching frequency programmed on the TPS23751PWP?
The TPS23751PWP switching frequency is set using an external resistor (RT) connected between the RT pin and ARTN. With RT = 34 kΩ, the nominal PWM frequency is 251 kHz (range: 226–276 kHz). Frequency scales inversely with RT value - e.g., 16.9 kΩ yields ~500 kHz, 169 kΩ yields ~50 kHz - enabling EMI tuning and transformer optimization per application requirements.
What is the function of the SRD pin on the TPS23751PWP?
The SRD (Synchronous Rectifier Disable) pin on the TPS23751PWP is an open-drain output that goes low during Variable Frequency Operation (VFO) mode to disable external synchronous rectifiers. This reduces light-load conduction losses and improves efficiency below ~20% load, particularly important in always-on surveillance or telecom equipment where idle power matters.
Can the TPS23751PWP be used with auxiliary power sources like wall adapters?
Yes - the TPS23751PWP supports adapter ORing via its APD (Auxiliary Power Detect) pin. When APD rises >1.43–1.57 V above ARTN, the internal MOSFET turns off, CLS is disabled, and T2P activates, allowing seamless switchover to auxiliary power without system reset or brownout. External resistor dividers (RAPD1/RAPD2) provide ESD protection and voltage supervision per Figure 32 in the datasheet.
TPS23751PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 25.5 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- Yes
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 0V ~ 57V
- Current - Supply:
- 1.8mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS23751PWP FAQ
1.How can I place an order for TPS23751PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23751PWP 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 TPS23751PWP reliable?
The price and inventory of TPS23751PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23751PWP is usually 5 days.
3.What payment methods are accepted for TPS23751PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23751PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23751PWP?
TPS23751PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23751PWP 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 TPS23751PWP?
For technical support, including TPS23751PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23751PWP requirements.
6.How does Aetrix verify that TPS23751PWP is sourced from the original manufacturer or authorized distributors?
All TPS23751PWP 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 TPS23751PWP meets industry standards.
7.What is the process for return or replacement of TPS23751PWP?
All TPS23751PWP units undergo pre-shipment inspection (PSI). If there is an issue with TPS23751PWP, 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 TPS23751PWP part is unused and in its original packaging.
Return procedure for TPS23751PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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