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Texas Instruments TPS23758RJJT
- Part No.:
- TPS23758RJJT
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 24-VFDFN Exposed Pad, 23 Leads
- Datasheet:
-
TPS23758RJJT.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 24VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,239
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Product details
Overview
TPS23758RJJT from Texas Instruments is an IEEE 802.3at Type-1 Power over Ethernet (PoE) powered device (PD) interface IC with integrated 150-V, 0.77-Ω switching MOSFET and current-mode flyback DC-DC controller. It delivers ±1% load regulation at 5 V, supports continuous conduction mode (CCM) with secondary-side synchronous rectification, and operates across –40°C to 125°C junction temperature. It enables compact, certified PoE PD designs for VoIP phones and security cameras.
For engineers reviewing the TPS23758RJJT datasheet, TPS23758RJJT pinout, TPS23758RJJT application, or TPS23758RJJT equivalent, this page provides verified technical context, validated pin functions, confirmed PoE/DC-DC parameter interactions, and real-world implementation constraints including PSR feedback, spread-spectrum dithering, and APD priority logic - all specific to the VSON-24 package and TPS23758RJJT ordering variant.
Technical Context
The TPS23758RJJT integrates a PoE PD front-end (detection, classification, hotswap) with a flyback DC-DC controller using primary-side regulation (PSR) via auxiliary winding feedback - eliminating optocoupler and shunt regulator. Its 150-V internal power FET and 0.36-Ω hotswap MOSFET support 13-W Type-1 operation under IEEE 802.3at.
It implements adjustable 223–273 kHz switching frequency, programmable soft-start via SST capacitor, and spread-spectrum frequency dithering (SSFD) controlled by DTHR pin. The controller supports CCM operation with synchronous rectification on secondary side and also accommodates non-isolated buck topology via VDD/VSS routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Standard Compliance | IEEE 802.3at Type-1 PD (13 W), EA logo certified |
| Integrated Power FET | 150-V drain rating, 0.77-Ω typical RDS(on), eliminates external high-voltage switch |
| Hotswap MOSFET | 100-V rating, 0.36-Ω typical RON, handles inrush and current limiting |
| Load Regulation | ±1% typical at 5-V output over 0–100% load range with sync FET |
| Switching Frequency | 223–273 kHz (adjustable via FRS resistor), with SSFD for EMI reduction |
| Operating Temperature | –40°C to 125°C junction range, enabling industrial and outdoor deployments |
| Package | VSON-24 (6.0 mm × 4.0 mm), thermally enhanced with exposed pad tied to VSS |
Pinout & Package
VSON-24 package with 6.0 mm × 4.0 mm body size and exposed thermal pad soldered to VSS plane for thermal management. Pin numbering follows standard JEDEC VSON layout (A1–A4 anchors, 1–24 signal pins).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RSNS | Power FET source sense | Connects to external current-sense resistor for peak-current-mode control and overcurrent protection |
| CP | Primary-side regulation clamp | Interfaces with auxiliary winding to enable optocoupler-free voltage regulation |
| GND | Power ground reference | Common return for flyback gate driver and CP circuit; must connect to RTN |
| SRR / SRF | VDS slew rate control inputs | Resistors to GND (SRR) and VB (SRF) set turn-on/turn-off dV/dt for EMI optimization |
| APD | Auxiliary power detect input | Raised >1.5 V above RTN disables PoE pass FET, enabling primary adapter priority |
| FRS | Frequency setting input | Resistor to RTN sets nominal switching frequency (223–273 kHz) |
| DRAIN | Internal power FET drain | High-side switch node for flyback transformer primary; rated 150 V |
| RTN | PoE return and controller reference | Output of hotswap stage; serves as bias reference for DC-DC error amplifier and CS |
| VPD / VDD | PoE input rails | VPD = PoE positive input (bypassed to VSS); VDD supplies startup current for flyback/buck modes |
| DEN / CLS | Detection & classification | DEN provides 24.9-kΩ detection signature; CLS sets IEEE class via resistor to VSS |
| FB / COMP | Feedback loop interface | FB accepts PSR voltage divider signal; COMP outputs error amplifier compensation network |
| SST | Soft-start timing | Capacitor to RTN sets startup ramp rate and hiccup timer duration |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation (PSR) | Eliminates optocoupler and TL431, reducing BOM count and board area in isolated flyback designs |
| Spread-spectrum frequency dithering | Reduces EMI peak amplitude via DTHR-controlled ramp, lowering filter component cost and size |
| Advanced startup architecture | Enables minimal bias capacitor (≥0.8 µF) while ensuring reliable start-up under low-input-voltage conditions |
| Secondary-side synchronous rectification support | Optimizes efficiency and load regulation across multiple outputs (e.g., 5 V + 3.3 V) in CCM |
| Primary auxiliary power detect (APD) | Allows seamless fallback to external wall adapter when PoE is unavailable - no firmware or external logic required |
Applications
| VoIP Phones | Security Cameras |
|---|---|
Use Scenario: Powered via CAT5e/6 Ethernet cable in enterprise office environments with centralized PoE switches. IC Role / Device Role / Timing Role: TPS23758RJJT acts as full PoE PD interface and primary DC-DC controller, managing detection, classification, hotswap, and regulated 5-V/3.3-V rail generation. Use Value: Enables single-cable deployment with <1% load regulation and robust inrush control, meeting IEEE 802.3at Class 2 (6.49 W) requirements. | Use Scenario: Outdoor IP camera with wide temperature range (-40°C to 60°C ambient) and motion-triggered high-power imaging bursts. IC Role / Device Role / Timing Role: TPS23758RJJT provides PoE compliance, thermal shutdown (145°C trip), and fast transient response via PSR and CCM synchronous rectification. Use Value: Delivers stable 5-V output across full load range with ±1% regulation, supporting image sensor and IR LED drivers without external LDO post-regulation. |
| IP Phones | Wireless Access Points |
Use Scenario: Desktop IP phone with LCD display, speakerphone, and USB peripheral charging capability. IC Role / Device Role / Timing Role: TPS23758RJJT manages dual-output flyback (5 V for logic, 3.3 V for PHY) with independent load step response and PSR accuracy. Use Value: Achieves <1% cross-regulation between outputs and supports buck topology for auxiliary rails - simplifying multi-rail power architecture. | Use Scenario: Dual-band 802.11ac access point requiring PoE+ power with burst transmit loads up to 2.2 A. IC Role / Device Role / Timing Role: TPS23758RJJT serves as PoE PD and main DC-DC controller, coordinating APD priority for optional AC adapter backup during PoE brownout. Use Value: Enables seamless switchover to primary adapter without reboot, maintaining Wi-Fi uptime during PoE interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23753ARJBR | IEEE 802.3af (Type 1, 15.4 W), no integrated 150-V FET - requires external high-side switch | Limited to lower-power PoE devices; lacks PSR and synchronous rectification support | Choose for cost-sensitive 802.3af designs where external FET integration is acceptable |
| LT4275AIMSE#PBF | IEEE 802.3at-compliant PD interface only - no integrated DC-DC controller or power FET | Requires separate flyback controller and external MOSFETs; adds design complexity and footprint | Choose when architectural flexibility or discrete component selection is prioritized over integration |
Compared with TPS23753ARJBR and LT4275AIMSE#PBF, the TPS23758RJJT uniquely combines PoE PD interface, 150-V switching FET, and PSR flyback controller in one VSON-24 package - reducing component count by ≥7 parts and PCB area by >35% in typical 5-V/3.3-V dual-output designs.
Availability
TPS23758RJJT is available at Aetrix Electronics and suitable for VoIP phones, security cameras, and wireless access points requiring stable component supply, long-term lifecycle support, and IEEE 802.3at certification traceability.
Supply support for TPS23758RJJT 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 and interface technologies.
The TPS23758RJJT belongs to TI's PoE PD controller product line, designed specifically for compact, certified, single-chip IEEE 802.3at Type-1 powered devices requiring integrated DC-DC conversion and thermal robustness.
FAQ
What is the maximum input voltage the TPS23758RJJT can withstand on its VPD pin?
The TPS23758RJJT has an absolute maximum VPD rating of 100 V, with recommended operating range up to 57 V. This 100-V rating ensures robust operation during PoE cable surge events and allows compatibility with legacy 802.3af PSEs as well as 802.3at systems. The internal hotswap MOSFET is rated for 100 V, and the integrated 150-V power FET provides margin for flyback reset voltage spikes. Always observe the 57-V max operating limit per datasheet Section 6.3 to ensure long-term reliability of the TPS23758RJJT.
Does the TPS23758RJJT support secondary-side synchronous rectification?
Yes, the TPS23758RJJT explicitly supports secondary-side synchronous rectification in continuous conduction mode (CCM), as confirmed in the device description and Features section. It achieves ±1% load regulation at 5 V with sync FET operation and is optimized for multi-output flyback topologies (e.g., 5 V and 3.3 V). The controller provides precise timing and drive capability for external synchronous rectifier FETs, improving overall efficiency and thermal performance compared to diode-based rectification - a key design value of the TPS23758RJJT in power-constrained PoE endpoints.
How does the APD pin function in the TPS23758RJJT, and what is its threshold voltage?
The APD (Auxiliary Power Detect) pin on the TPS23758RJJT enables priority selection between PoE and an external DC adapter. When APD is raised to ≥1.42 V above RTN (typical threshold 1.5 V), the internal hotswap MOSFET turns off, disconnecting PoE power and allowing the primary adapter to supply the system. If unused, APD must be tied to RTN. This feature is implemented in hardware with no firmware dependency, making it ideal for failover-critical applications like wireless access points. The TPS23758RJJT datasheet specifies APD hysteresis of 0.3 V for noise immunity.
Can the TPS23758RJJT be used in non-isolated buck converter configurations?
Yes, the TPS23758RJJT supports non-isolated buck topology as documented in Section 3 and Figure 8-1 of the datasheet. In buck mode, VDD connects directly to VPD, and the internal 150-V power FET operates as the high-side switch. The controller retains current-mode control, soft-start, and protection features. This capability extends the utility of the TPS23758RJJT beyond PoE-powered isolation - for example, in auxiliary power rails derived from local DC sources. Designers must follow the buck-specific layout and component selection guidelines in the TPS23758RJJT datasheet to ensure stability and safety.
What is the purpose of the DTHR pin on the TPS23758RJJT, and how is it configured?
The DTHR pin on the TPS23758RJJT controls spread-spectrum frequency dithering (SSFD) to reduce electromagnetic interference. It requires a capacitor to RTN and a resistor from DTHR to FRS to set dither amplitude and frequency. Typical configuration uses 1 nF to RTN and 100 kΩ to FRS, yielding ~1.03 V pk-pk dither. If SSFD is not needed, DTHR is shorted to VB. The TPS23758RJJT datasheet confirms DTHR sourcing/sinking currents of ~49.6 µA and thresholds of 1.513 V (upper) and 0.487 V (lower), enabling predictable EMI filter sizing - a critical advantage in dense, emissions-sensitive PoE endpoint designs.
TPS23758RJJT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFDFN Exposed Pad, 23 Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 12.95 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- Yes
- Standards:
- 802.3at (PoE)
- Voltage - Supply:
- 0V ~ 57V
- Current - Supply:
- 2.35mA
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VSON (6x4)
TPS23758RJJT FAQ
1.How can I place an order for TPS23758RJJT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23758RJJT 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 TPS23758RJJT reliable?
The price and inventory of TPS23758RJJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23758RJJT is usually 5 days.
3.What payment methods are accepted for TPS23758RJJT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23758RJJT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23758RJJT?
TPS23758RJJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23758RJJT 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 TPS23758RJJT?
For technical support, including TPS23758RJJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23758RJJT requirements.
6.How does Aetrix verify that TPS23758RJJT is sourced from the original manufacturer or authorized distributors?
All TPS23758RJJT 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 TPS23758RJJT meets industry standards.
7.What is the process for return or replacement of TPS23758RJJT?
All TPS23758RJJT units undergo pre-shipment inspection (PSI). If there is an issue with TPS23758RJJT, 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 TPS23758RJJT part is unused and in its original packaging.
Return procedure for TPS23758RJJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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