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Texas Instruments TPS23751PWPR
- Part No.:
- TPS23751PWPR
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS23751PWPR.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,444
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Product details
Overview
TPS23751PWPR from Texas Instruments is a 16-pin IEEE 802.3at Type-2 PoE powered device (PD) interface IC with integrated flyback DC-DC controller, featuring a 0.5 Ω/100 V hot-swap MOSFET, programmable 226–276 kHz switching frequency, and 25.5 W power delivery capability for VoIP phones and security cameras.
For engineers reviewing the TPS23751PWPR datasheet, TPS23751PWPR pinout, TPS23751PWPR application, or TPS23751PWPR equivalent, this device supports hardware-based IEEE 802.3at classification, auxiliary power detect (APD), synchronous rectifier disable (SRD), and thermal shutdown - all in a PowerPAD™ TSSOP-16 package with verified 39.5°C/W junction-to-ambient thermal resistance.
Technical Context
The TPS23751PWPR implements full IEEE 802.3at Type-2 PD functionality including detection, classification, inrush current limiting, and maintain power signature (MPS) generation. Its PoE interface operates with 36.3–40 V UVLO rising threshold and supports 13–23 V classification voltage range via external RCLS resistor.
The integrated current-mode flyback controller features internal soft-start, slope-compensated PWM, variable-frequency operation (VFO) at light loads, and gate drive capable of 0.6 A source / 1.0 A sink. It disables synchronous rectification below 1.9–2.1 V on CTL to enhance efficiency under partial load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Standard | Compliant with IEEE 802.3at Type-2 PD specification for up to 25.5 W power delivery. |
| Input Voltage Range | 36.3 V to 57 V operating range; includes 36.3–40 V UVLO rising threshold for reliable PoE startup. |
| Pass MOSFET rDS(on) | 0.45 Ω typical (0.20–0.75 Ω max); enables ≤0.85 A continuous RTN current with minimal conduction loss. |
| Switching Frequency | 226–276 kHz (PWM mode, RT = 34 kΩ); adjustable via external resistor for EMI optimization and transformer selection. |
| Thermal Resistance | 39.5°C/W θJA (TSSOP-16 PowerPAD™); requires thermal pad soldered to PCB ground plane for safe 125°C operation. |
| Current Sense Threshold | 0.25 V typical (0.22–0.28 V max) on CS pin; sets precise overcurrent protection for isolated flyback primary side. |
| VFO Transition Threshold | 2.00 V typical CTL voltage (1.90–2.10 V) to enter variable-frequency operation; reduces switching losses at light loads. |
Pinout & Package
TPS23751PWPR is housed in 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 supply rail | Accepts 36–57 V PoE input; bypassed to VSS with 0.1 µF capacitor for stable bias. |
| DEN | Detection/enable control | Pull to VSS to disable pass MOSFET; 24.9 kΩ to VDD enables detection sequence. |
| CLS | Classification current output | Sinks programmed classification current (e.g., 2.17 mA with 1270 Ω to VSS) for IEEE 802.3at Class 4 identification. |
| APD | Auxiliary power detect input | Raised >1.5 V above ARTN disables pass MOSFET and asserts T2P - used for adapter ORing. |
| RT | Oscillator timing resistor | Resistor to ARTN sets PWM frequency (e.g., 34 kΩ → 251 kHz typical); enables EMI tuning. |
| T2P | Type-2 PSE indicator | Active-low open-drain output signaling Type-2 PSE connection or APD activation. |
| SRD | Synchronous rectifier disable | Asserts low during VFO mode to disable external synchronous rectifiers and reduce light-load losses. |
| CTL | PWM/VFO control input | Analog input setting duty cycle (PWM) or triggering VFO transition at ~2.0 V; referenced to ARTN. |
| VB | Bias supply output | 5.0 V ±2.5% regulated output (0–5 mA); powers external circuitry and requires ≥0.08 µF bypass to ARTN. |
| CS | Current sense input | ARTN-referenced input for primary-side current sensing; 0.25 V threshold triggers current limit. |
| VC | GATE driver supply | 12 V internal supply for GATE driver; bypassed with ≥0.47 µF to ARTN for stable high-side drive. |
| GATE | External MOSFET driver | Push-pull output driving external flyback switch; 0.6 A source / 1.0 A sink capability. |
| ARTN | Analog return reference | Local analog ground for DC-DC controller; must be tied to RTN per datasheet requirement. |
| RTN | Pass MOSFET drain terminal | Drain node of internal 100 V/0.5 Ω hot-swap MOSFET; connects to ARTN and PoE return path. |
| VSS | Power ground | Negative PoE rail reference; all digital logic and thermal pad connect here. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type-2 PoE Interface | Hardware-based IEEE 802.3at classification, detection, and MPS generation - no firmware required. |
| Robust Hot-Swap MOSFET | 100 V breakdown rating and 0.45 Ω typical rDS(on) enable direct PoE input handling without external FET. |
| Adaptive Light-Load Efficiency | Variable-frequency operation (VFO) and SRD signal reduce switching and conduction losses below 20% load. |
| Programmable Switching Frequency | 226–276 kHz range set by single RT resistor - allows transformer size/EMI trade-off optimization. |
| Thermal Protection | 135–155°C shutdown with 20°C hysteresis prevents damage during sustained overload or poor heatsinking. |
Applications
| VoIP Telephones | Security Cameras |
|---|---|
Use Scenario: Powered over Ethernet in enterprise office deployments with centralized PoE switches. IC Role / Device Role / Timing Role: Acts as IEEE 802.3at Type-2 PD interface and primary-side flyback controller for 5 V/3.3 V system rails. Use Value: Eliminates local AC/DC adapter; delivers up to 25.5 W with integrated current-limiting and thermal protection. |
Use Scenario: Outdoor IP cameras requiring reliable power and data over single Cat5e cable. IC Role / Device Role / Timing Role: Provides PoE classification, inrush control, and isolated DC-DC conversion for image sensor and SoC rails. Use Value: Enables robust startup under cold temperature (-40°C) and maintains MPS during standby. |
| Multiband Access Points | Pico-Base Stations |
Use Scenario: High-density Wi-Fi 6 access points deployed in ceilings with limited space for power supplies. IC Role / Device Role / Timing Role: Serves as PoE PD front-end and flyback controller powering RF transceivers and baseband processors. Use Value: Reduces BOM count by integrating detection, classification, and DC-DC control in one 5×4.4 mm package. |
Use Scenario: Small-cell 4G/LTE base stations installed on streetlights or utility poles using PoE infrastructure. IC Role / Device Role / Timing Role: Manages PoE handshaking and regulates isolated 12 V rail for RF power amplifiers. Use Value: Supports 125°C junction operation for outdoor thermal environments while maintaining 80%+ efficiency at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23752PWPR | 20-pin TSSOP with Sleep Mode, SLPb/MODE/WAKE pins, and pulsed MPS generation; adds 10.6 mA sleep current. | Required for IEEE 802.3at-compliant devices needing ultra-low-power standby with active MPS maintenance. | Select TPS23752PWPR only if Sleep Mode functionality is mandatory; otherwise TPS23751PWPR offers identical PoE + DC-DC performance in smaller footprint. |
| LT4275AIMSE#PBF | Linear Technology/Analog Devices 16-pin IEEE 802.3at PD interface with integrated DC-DC controller; 0.35 Ω rDS(on), 200–750 kHz programmable frequency. | Supports wider input range (13–60 V) and higher peak current (1.2 A), but lacks VFO mode and SRD signal. | Choose LT4275AIMSE#PBF when higher inrush tolerance or broader input voltage range is needed; TPS23751PWPR excels in light-load efficiency and thermal performance. |
Compared with TPS23752PWPR, the TPS23751PWPR omits Sleep Mode circuitry for lower cost and smaller layout area; compared with LT4275AIMSE#PBF, it delivers superior light-load efficiency via VFO and synchronous rectifier disable - critical for battery-backed or always-on edge devices.
Availability
TPS23751PWPR is available at Aetrix Electronics and suitable for VoIP telephony, security camera systems, and wireless access points requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS23751PWPR 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 over 50 years of innovation in power management ICs.
The TPS23751PWPR belongs to TI's Power-over-Ethernet product line, designed specifically for IEEE 802.3at-compliant powered devices requiring integrated PD interface and isolated DC-DC control in compact form factors.
FAQ
What is the maximum continuous current supported by the TPS23751PWPR internal MOSFET?
The TPS23751PWPR internal MOSFET supports up to 0.85 A continuous current at TJ ≤ 125°C, with 0.45 Ω typical rDS(on) enabling efficient power delivery. This is validated under recommended operating conditions with proper PCB thermal design - including soldering the PowerPAD™ to a large VSS copper area - and aligns with IEEE 802.3at Class 4 power limits. Peak inrush current reaches 140 mA during startup.
Does the TPS23751PWPR support IEEE 802.3af (PoE) as well as 802.3at (PoE+)?
Yes, the TPS23751PWPR supports both IEEE 802.3af and 802.3at standards. Its detection and classification circuitry complies with 802.3af requirements, while its Type-2 hardware classification and 25.5 W capability fully satisfy 802.3at. The device automatically negotiates based on PSE capabilities and external RCLS configuration - no software or mode selection is required.
How does the TPS23751PWPR achieve high efficiency across wide load ranges?
The TPS23751PWPR achieves high efficiency across wide load ranges through three key mechanisms: (1) current-mode PWM control with slope compensation for stable regulation, (2) variable-frequency operation (VFO) that reduces switching losses at light loads, and (3) an SRD signal that disables external synchronous rectifiers during VFO mode. These features collectively maintain >80% efficiency from 10% to 100% load in typical flyback designs.
What is the purpose of the APD pin on the TPS23751PWPR, and how is it used in adapter ORing applications?
The APD (Auxiliary Power Detect) pin on the TPS23751PWPR enables adapter ORing by allowing seamless switchover between PoE and auxiliary DC input. When APD rises >1.5 V above ARTN, the device disables the internal pass MOSFET and asserts T2P - effectively disconnecting PoE and routing power from the auxiliary source. This function is implemented using a resistor divider (RAPD1/RAPD2) and is fully hardware-based, requiring no microcontroller intervention.
Can the TPS23751PWPR be used without the integrated DC-DC controller, solely as a PoE PD interface?
Yes, the TPS23751PWPR can be used exclusively as a PoE PD interface. Its PoE section - including detection, classification, inrush control, and MPS generation - operates independently of the DC-DC controller. To disable the controller, tie CTL to VB and leave GATE unconnected; the device will still complete IEEE 802.3at handshaking and maintain valid MPS while delivering power to an external regulator stage.
TPS23751PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
TPS23751PWPR FAQ
1.How can I place an order for TPS23751PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23751PWPR 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 TPS23751PWPR reliable?
The price and inventory of TPS23751PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23751PWPR is usually 5 days.
3.What payment methods are accepted for TPS23751PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23751PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23751PWPR?
TPS23751PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23751PWPR 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 TPS23751PWPR?
For technical support, including TPS23751PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23751PWPR requirements.
6.How does Aetrix verify that TPS23751PWPR is sourced from the original manufacturer or authorized distributors?
All TPS23751PWPR 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 TPS23751PWPR meets industry standards.
7.What is the process for return or replacement of TPS23751PWPR?
All TPS23751PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS23751PWPR, 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 TPS23751PWPR part is unused and in its original packaging.
Return procedure for TPS23751PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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