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Texas Instruments TPS23752PWPR
- Part No.:
- TPS23752PWPR
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS23752PWPR.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
TPS23752PWPR from Texas Instruments is a 20-pin IEEE 802.3at Type 2 Power over Ethernet (PoE) Powered Device (PD) interface IC with integrated flyback DC-DC controller and ultra-low-power Sleep Mode. It delivers up to 25.5 W, features a 100 V / 0.5 Ω hot-swap MOSFET, supports programmable switching frequency (226–276 kHz PWM), and maintains IEEE 802.3at Maintain Power Signature (MPS) in Sleep Mode for security cameras and VoIP phones.
For engineers reviewing the TPS23752PWPR datasheet, TPS23752PWPR pinout, TPS23752PWPR application, or TPS23752PWPR equivalent, this page provides verified technical context on PoE classification, VFO-mode light-load efficiency, Sleep Mode current consumption (10.6 mA pulsed MPS), thermal shutdown (145 °C), and synchronous rectifier disable (SRD) timing - all critical for industrial PoE PD design validation.
Technical Context
The TPS23752PWPR implements full IEEE 802.3at Type 2 hardware classification with dual-class detection (CLS pin resistor-programmable), auxiliary power detect (APD ≥1.5 V relative to ARTN), and robust 100 V pass FET with foldback current limiting. Its DC-DC controller uses current-mode control with slope compensation, blanking (100–200 ns), and variable frequency operation (VFO) below 1.9 V CTL to sustain efficiency at light loads.
Sleep Mode-exclusive to TPS23752-is activated by pulling SLPb low and enables MPS generation while disabling the converter core. It delivers 2.5 V wake-up output (WAKE), supports pulsed or DC MPS (28.9% duty cycle, 87.5 ms ON time), and draws only 1 mA typical supply current when APD is enabled-enabling always-on surveillance devices with <15 mW standby power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Standard | Compliant with IEEE 802.3at Type 2 PD specification including hardware classification, MPS, and inrush control. |
| Max Output Power | 25.5 W delivered to isolated DC-DC stage; enabled by 0.5 Ω rDS(on) MOSFET supporting 1.0 A continuous RTN current. |
| Switching Frequency | PWM mode: 226–276 kHz (RT = 34 kΩ); VFO mode: 105–165 kHz - dynamically reduces switching loss below 20% load. |
| Sleep Mode Current | 10.6 mA peak (pulsed MPS) or 10.6 mA DC; maintains valid 10–15 mA MPS signature without enabling converter switching. |
| Thermal Protection | Thermal shutdown at 145 °C (±10 °C hysteresis); junction-to-ambient RθJA = 38.5 °C/W in TSSOP-20 package. |
| Input Voltage Range | Valid PoE operation from 38.1 V (UVLO rising) to 57 V; supports legacy 802.3af and full 802.3at PSEs. |
| Current Sense Threshold | CS pin: 0.25 V max for PWM current limit; 50 mV typical peak in VFO mode - enables precise light-load regulation. |
Pinout & Package
TPS23752PWPR is housed in a thermally enhanced 20-pin TSSOP (PWP) package (6.50 mm × 4.40 mm) with exposed PowerPAD™ thermal pad connected to VSS. The package supports high-power dissipation via PCB copper fill under the pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | PoE input rail connection | Accepts 38–57 V PoE input; bypassed to VSS with 0.1 µF capacitor for noise filtering. |
| DEN | Detection/Enable control | Pull to VSS to disable pass MOSFET; 24.9 kΩ pull-up to VDD enables detection sequence. |
| CLS | Classification current source | Drives external resistor to VSS to set IEEE class (e.g., 137 Ω → Class 4, 18.6 mA). |
| APD | Auxiliary power detect input | Rising >1.5 V above ARTN disables MOSFET and forces T2P active; disables MPS in Sleep Mode. |
| RT | Oscillator timing resistor | Resistor to ARTN sets PWM frequency (e.g., 34 kΩ → 251 kHz nominal). |
| T2P | Type 2 PSE indicator output | Active-low open-drain signal confirms Type 2 PSE handshake completion (delay ≤7 ms). |
| SRD | Synchronous rectifier disable | Asserts low during VFO mode to disable external SR gate drive and reduce light-load losses. |
| CTL | PWM/VFO transition control | Voltage threshold (2.00 V typ.) determines switch from PWM to variable-frequency operation. |
| SRT | VFO transition threshold adjust | Resistor divider sets CTL threshold (0.5–1.5 V range) to fine-tune light-load efficiency point. |
| VB | Bias supply output | Regulated 5.0 V ±2.5% output (5 mA max); powers internal logic and external circuitry. |
| CS | Current sense input | ARTN-referenced input for primary-side current sensing; 0.25 V threshold for overcurrent protection. |
| VC | GATE driver supply | 12.8 V (typ.) regulated supply for GATE driver; requires ≥0.47 µF bypass to ARTN. |
| GATE | External MOSFET driver | Capable of 0.6 A peak source / 1.0 A peak sink; rise/fall times <40 ns with 1 nF load. |
| ARTN | Analog return reference | Local ground for DC-DC controller analog circuitry; must be tied to RTN per datasheet. |
| RTN | Pass MOSFET drain terminal | Drain node of internal 100 V / 0.5 Ω FET; connects to transformer primary return. |
| VSS | Negative PoE rail | System ground reference; PowerPAD™ must be soldered directly to VSS plane. |
| SLPb | Sleep Mode enable input | Pull low to enter Sleep Mode; threshold 1.66 V (typ.); internal 5.7 µA pull-up. |
| WAKE | Wake-up output | 2.50 V (typ.) CMOS output during Sleep Mode; used to reset external logic or enable auxiliary rails. |
| MODE | MPS configuration input | Selects pulsed (MODE = 0 V) or DC (MODE = VB) MPS; threshold 1.66 V (typ.). |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 802.3at Type 2 Classification | Hardware-based dual-event classification with programmable CLS current (Class 0–4) and T2P status flag. |
| Ultra-Low-Power Sleep Mode | Enables MPS-only operation at 10.6 mA while fully disabling DC-DC switching - ideal for battery-backed or energy-harvested PDs. |
| Integrated 100 V / 0.5 Ω Hot-Swap FET | Eliminates external pass transistor; supports 1.0 A continuous current with foldback protection and 140 mA inrush limiting. |
| Variable Frequency Operation (VFO) | Reduces switching frequency below 20% load to maintain >75% efficiency down to 50 mW output - critical for always-on IoT endpoints. |
| Synchronous Rectifier Disable (SRD) | Automatically disables external SR gate drive in VFO mode, preventing shoot-through and reducing gate drive losses at light loads. |
| Robust ESD & Surge Protection | 8 kV contact / 15 kV air IEC 61000-4-2 ESD rating on RJ-45 lines; integrated surge tolerance simplifies front-end protection design. |
Applications
| Video Surveillance Camera | VoIP Telephone |
|---|---|
Use Scenario: Outdoor IP camera with motion-triggered recording and night vision IR LEDs requiring always-on network connectivity and low standby power. IC Role / Device Role / Timing Role: TPS23752PWPR acts as PoE PD interface and primary DC-DC controller, managing 48 V PoE input, generating isolated 12 V for imaging sensor and 3.3 V for SoC, and maintaining MPS during idle periods. Use Value: Sleep Mode reduces total system standby power to <15 mW while preserving remote wake-up capability and IEEE-compliant MPS - extending battery backup runtime and meeting EN 55032 Class B emissions. |
Use Scenario: Enterprise desk phone with HD voice, Bluetooth headset pairing, and local USB charging port operating from single-cable PoE infrastructure. IC Role / Device Role / Timing Role: TPS23752PWPR provides IEEE 802.3at Type 2 classification, controls flyback converter for 5 V/3.3 V rails, and manages APD-driven switchover to local USB power when PoE fails. Use Value: Integrated APD input and robust 100 V FET enable seamless auxiliary power handover without brownout; VFO mode sustains >82% efficiency at 100 mW ring-tone load. |
| Wireless Access Point | Industrial IoT Gateway |
Use Scenario: Dual-band 802.11ac access point deployed in ceiling-mounted enclosures with limited airflow and strict thermal budgets. IC Role / Device Role / Timing Role: TPS23752PWPR serves as PoE PD front-end and flyback controller powering RF transceivers, baseband processor, and PHY; thermal pad dissipates heat directly to chassis ground. Use Value: Junction-to-board RθJB = 25.6 °C/W and thermal shutdown at 145 °C ensure reliable operation in 70 °C ambient environments without forced cooling. |
Use Scenario: DIN-rail mounted gateway aggregating Modbus, CAN, and LoRaWAN sensors in factory automation, powered exclusively via PoE. IC Role / Device Role / Timing Role: TPS23752PWPR handles PoE negotiation, powers isolated 24 V field bus rail and 5 V microcontroller domain, and asserts T2P to confirm Type 2 PSE compatibility for high-power sensor clusters. Use Value: T2P status flag enables firmware-level PSE capability verification before enabling high-current peripherals; classification current accuracy ±3% ensures consistent PSE allocation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23751PWPR | 16-pin TSSOP; lacks Sleep Mode, WAKE, MODE, and SLPb pins; no MPS generation in low-power state. | Not suitable for always-on devices requiring sub-20 mW standby; supports same 25.5 W output but higher quiescent current (210–500 µA vs 10.6 mA pulsed). | Select TPS23751PWPR only for cost-sensitive, non-sleeping PDs where board space is constrained and MPS is not required during idle. |
| LT4275AIMSE#PBF | 16-pin MSOP; IEEE 802.3at-compliant but no integrated DC-DC controller; requires external flyback controller. | Increases BOM count and layout complexity; supports higher voltage (60 V max) but no VFO or SRD features for light-load optimization. | Choose LT4275AIMSE#PBF when using a discrete controller with specific topology requirements (e.g., active clamp flyback) or needing extended input voltage margin beyond 57 V. |
Compared with TPS23751PWPR, the TPS23752PWPR adds Sleep Mode functionality essential for energy-constrained edge devices, while LT4275AIMSE#PBF trades integration for flexibility - making TPS23752PWPR optimal for compact, self-contained PoE PDs demanding lowest possible standby power and minimal external components.
Availability
TPS23752PWPR is available at Aetrix Electronics and suitable for video surveillance systems, VoIP telephony infrastructure, wireless access points, industrial gateways, and smart building controllers requiring stable component supply across multi-year production cycles.
Supply support for TPS23752PWPR 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 power management technologies, with decades of leadership in Power over Ethernet solutions.
The TPS2375x product line was designed specifically for IEEE 802.3at-compliant Powered Devices requiring integrated PoE interface + DC-DC control in a single IC - targeting high-efficiency, thermally constrained, and low-standby-power applications like IP cameras and unified communications endpoints.
FAQ
What is the key functional difference between TPS23752PWPR and TPS23751PWPR?
The TPS23752PWPR adds dedicated Sleep Mode functionality absent in TPS23751PWPR, including SLPb, WAKE, and MODE pins plus internal circuitry to generate IEEE 802.3at Maintain Power Signature (MPS) while disabling the DC-DC converter. This allows TPS23752PWPR to draw only 10.6 mA in pulsed MPS mode versus TPS23751PWPR's minimum ~210 µA operating current - a critical distinction for always-on surveillance or sensor nodes.
How does the TPS23752PWPR implement IEEE 802.3at Type 2 classification?
The TPS23752PWPR performs hardware-based Type 2 classification using its CLS pin: an external resistor (e.g., 137 Ω) between CLS and VSS sets classification current (18.6 mA for Class 4). It executes two sequential detection/classification events, then asserts T2P low to signal Type 2 PSE recognition. The device also monitors APD voltage to disable the pass FET if auxiliary power exceeds 1.5 V above ARTN - ensuring safe switchover.
What thermal design considerations apply to the TPS23752PWPR in a 20-pin TSSOP package?
The TPS23752PWPR uses a PowerPAD™ thermal pad that must be soldered to a large VSS copper pour to achieve its rated RθJA of 38.5 °C/W. Thermal shutdown activates at 145 °C (±10 °C hysteresis), and junction-to-board RθJB is 25.6 °C/W - meaning board-level copper area directly beneath the package is more impactful than airflow alone. For 25.5 W operation, TI recommends ≥4 cm² of 2-oz copper connected to the PowerPAD™.
Can the TPS23752PWPR support auxiliary power switchover without external logic?
Yes - the APD pin enables autonomous auxiliary power switchover. When voltage on APD rises >1.5 V above ARTN, the TPS23752PWPR immediately disables its internal pass MOSFET (via RTN), deactivates CLS, and asserts T2P low. This cleanly isolates the PoE path while allowing external circuitry (e.g., OR-ing diodes or ideal diodes) to supply power from a local adapter or battery - all without MCU intervention.
What is the purpose and behavior of the SRD pin on the TPS23752PWPR?
The SRD (Synchronous Rectifier Disable) pin is an open-drain output that goes low during Variable Frequency Operation (VFO) mode - triggered when CTL voltage drops below 2.00 V. This signal disables external synchronous rectifier gate drivers to prevent shoot-through and reduce gate drive losses at light loads. SRD remains high during full PWM operation, allowing normal SR control via the main controller.
TPS23752PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-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:
- 20-HTSSOP
TPS23752PWPR FAQ
1.How can I place an order for TPS23752PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23752PWPR 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 TPS23752PWPR reliable?
The price and inventory of TPS23752PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23752PWPR is usually 5 days.
3.What payment methods are accepted for TPS23752PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23752PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23752PWPR?
TPS23752PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23752PWPR 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 TPS23752PWPR?
For technical support, including TPS23752PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23752PWPR requirements.
6.How does Aetrix verify that TPS23752PWPR is sourced from the original manufacturer or authorized distributors?
All TPS23752PWPR 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 TPS23752PWPR meets industry standards.
7.What is the process for return or replacement of TPS23752PWPR?
All TPS23752PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS23752PWPR, 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 TPS23752PWPR part is unused and in its original packaging.
Return procedure for TPS23752PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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