Product details


Vin (Min) (V) 10.2 Vin (Max) (V) 60 PoE current limit (Min) (mA) 750 PoE inrush limit (Typ) (mA) 140 rDS(on) per FET (Typ) (mOhms) 300 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2, 802.3bt Type 3 PD power level 13W, 25W DC/DC control PD and DC/DC Fault response Auto Retry Features Adapter priority, Advanced startup, Automatic MPS, Error Amplifier, Inrush delay, Primary Side Adapter Priority, Primary-Side Regulation, Second Gate Drive, Spread Spectrum Frequency Dithering, Thermal Shutdown Switching frequency Programmable, Synchronizable open-in-new Find other Powered devices

Package | Pins | Size

VQFN (RMT) 45 35 mm² 7 x 5 open-in-new Find other Powered devices


  • Complete IEEE 802.3bt Type 3 (Class 1-4) and 802.3at PoE PD Solution
    • EA Gen 2 Logo-Ready (PoE 2 PD Controller)
    • Robust 100 V, 0.3 Ω (typ) Hotswap MOSFET
    • Supports Power Levels for up to 30-W Operation
  • Integrated PWM Controller for Flyback or Active Clamp Forward Configuration
    • Flyback Control with Primary-Side Regulation
      • Supports CCM Operation
      • ±1.5% (typ, 5-V Output) Load Regulation (0-100% load range) — with Sync FET
      • ±3% (typ, 12-V Output) Load Regulation (5-100% load range) — Diode Rectified
    • Also supports secondary-side regulation
    • Soft-Start Control with Advanced Startup and Hiccup Mode Overload Protection
    • Soft-Stop Shutdown
    • Adjustable Frequency with Synchronization
    • Programmable Frequency Dithering for EMI
  • Automatic Maintain Power Signature (MPS)
    • Auto-adjust to PSE Type and Load Current with Auto-stretch
  • Primary Adapter Priority Input
  • –40°C to 125°C Junction Temperature Range
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The TPS23734 device combines a Power over Ethernet (PoE) powered device (PD) interface, and a current-mode DC-DC controller optimized for flyback and active clamp forward (ACF) switching regulator designs . In the case of flyback configuration, the use of primary-side regulation (PSR) is supported. The PoE interface supports the IEEE 802.3bt and IEEE 802.3at standards for applications needing up to 25.5 W or less at PD input.

Programmable spread spectrum frequency dithering (SSFD) is provided to minimize the size and cost of EMI filter. Advanced Startup with adjustable soft-start helps to use minimal bias capacitor while simplifying converter startup and hiccup design, also ensuring that IEEE 802.3bt/at startup requirements are met.

The soft-stop feature minimizes stress on switching power FETs , allowing FET BOM cost reduction.

The PSR feature of the DC-DC controller uses feedback from an auxiliary winding for control of the output voltage, eliminating the need for external shunt regulator and optocoupler. It is optimized for continuous conduction mode (CCM), and can work with secondary side synchronous rectification, resulting in optimum efficiency, regulation accuracy and step load response over multiple outputs.

The DC-DC controller features slope compensation and blanking. Typical switching frequency is 250 kHz.

The automatic MPS enables applications with low power modes or multiple power feeds. It automatically adjusts its pulsed current amplitude and duration according to PSE Type and system conditions, to maintain power while minimizing consumption.

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Technical documentation

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Type Title Date
* Data sheet TPS23734 IEEE 802.3bt Type 3 Class 1-4 PoE PD with High Efficiency DC-DC Control datasheet (Rev. A) Sep. 21, 2020
Application note PoE PD Schematic Review Guidelines Apr. 29, 2021
Application note Soft-Stop: TPS2373X Feature Explanation Oct. 27, 2020
User guide TPS23734EVM-094 Evaluation Module Jun. 02, 2020
Certificate TPS23734EVM-094 EU Declaration of Conformity (DoC) May 29, 2020

Design & development

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Hardware development

document-generic User guide
The TPS23734 evaluation module (TPS23734EVM-094) contains evaluation and reference circuitry for the TPS23734, which is a IEEE802.3bt Type 3 Class 4 PoE PD, EA Gen 2 Ready, controller suitable for Type 3 (25.5W) PoE PD applications.
  • IEEE802.3bt Type 3 class 4 Compliant PoE PD
  • Integrated PWM controller for flyback or active clamp forward congifuration
  • Frequency dithering for EMI reduction
  • Soft-start control with advanced startup and hiccup mode overload protection
  • Soft-stop shutdown

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SLUC699.ZIP (1117 KB)

CAD/CAE symbols

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VQFN (RMT) 45 View options

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