Texas Instruments TPS23754PWPR

Overview

TPS23754PWPR from Texas Instruments is an IEEE 802.3at Type 2 Powered Device (PD) interface and current-mode DC-DC controller optimized for isolated flyback and active-clamp forward converters. It integrates a 100-V, 0.5-Ω hotswap MOSFET, supports up to 30-W input power, features dual complementary gate drivers with programmable dead time, and operates across –40°C to 125°C junction temperature. It enables PoE-powered security cameras and multiband access points.

For engineers reviewing the TPS23754PWPR datasheet, TPS23754PWPR pinout, TPS23754PWPR application, or TPS23754PWPR equivalent, key selection considerations include its 15-V converter start-up threshold, 227–278 kHz programmable switching frequency, 78% maximum duty cycle, dual gate drive capability, and IEEE 802.3at hardware classification support with status flag.

Technical Context

The TPS23754PWPR implements a current-mode PWM controller with internal soft-start, bootstrap start-up source, and accurate current-sense blanking. Its dual gate drivers (GATE and GAT2) support complementary operation with externally programmable dead time via DT pin, enabling efficient active-clamp forward topologies or optimized flyback designs.

The integrated PoE interface performs IEEE 802.3at-compliant detection (64.3 µA typical DEN current), classification (programmable via CLS resistor), and Type 2 hardware classification (T2P flag). It supports adapter ORing logic with APD/PPD control inputs and includes thermal shutdown (145°C turn-off), foldback current limiting, and UVLO on VC (15 V rising).

Key Specifications

Pinout & Package

TPS23754PWPR is housed in a thermally enhanced HTSSOP-20 package (6.50 mm × 4.40 mm) with exposed PowerPAD™ thermal pad connected to VSS.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PoE interface and DC-DC controller applications.

Compared with TPS23754PWPR, TPS23756PWPR offers lower start-up voltage but identical feature set, while LT4275AIMSE#TRPBF decouples PoE interface from DC-DC control-enabling higher power or custom topology flexibility at the cost of increased BOM count and layout complexity.

Availability

TPS23754PWPR is available at Aetrix Electronics and suitable for security cameras, VoIP telephones, multiband access points, and RFID readers requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for TPS23754PWPR 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 specializing in analog and embedded processing technologies, with leadership in power management and interface solutions.

The TPS2375x product line was designed specifically for IEEE 802.3at-compliant Powered Devices, integrating PoE interface, hotswap protection, and isolated DC-DC control in a single IC to reduce system size and bill-of-materials cost.

FAQ

What is the minimum PoE input voltage required for TPS23754PWPR to start the DC-DC converter?

The TPS23754PWPR requires VC to rise above 15 V (typical) to exit UVLO and initiate DC-DC operation. This occurs after sufficient charge accumulates on the VC capacitor via the VDD1-to-VC start-up current source. With VDD1 = 19.2 V, typical bootstrap start-up time is 81 ms; at 35 V, it reduces to 75 ms. The TPS23754PWPR does not operate below this threshold, ensuring stable regulation before enabling downstream circuitry.

How does the TPS23754PWPR support adapter ORing functionality?

The TPS23754PWPR implements adapter ORing through two dedicated pins: APD and PPD. Raising APD above 1.5 V disables the internal hotswap MOSFET and forces power from an external VDD1–RTN adapter, while asserting T2P. PPD enables classification when APD is active. This allows deterministic priority selection-PoE, adapter, or both-without external diodes or controllers. The TPS23754PWPR manages all arbitration logic internally.

Can the TPS23754PWPR drive synchronous rectifiers in a secondary-side topology?

Yes-the TPS23754PWPR's GAT2 output is a fully functional gate driver capable of driving synchronous rectifiers in forward or flyback topologies. When configured with appropriate dead time (via DT pin resistor), GAT2 operates complementarily to GATE. Its 0.6 A source / 1.0 A sink capability supports standard 12-V gate drive for common N-channel MOSFETs. The TPS23754PWPR does not include secondary-side sensing; external circuitry is required for voltage-mode or current-mode synchronous rectifier control.

What is the purpose of the BLNK pin on the TPS23754PWPR?

The BLNK pin on the TPS23754PWPR controls current-sense blanking duration to suppress turn-on spikes at the CS pin. Connecting BLNK to ARTN uses the internal ~55 ns blanking period; adding a resistor (e.g., 249 kΩ) programs a more precise value per datasheet Equation 2. This prevents false overcurrent triggering during MOSFET turn-on, especially critical in high-frequency or high-dV/dt isolated converters. The TPS23754PWPR's blanking is independent of switching frequency and remains stable across temperature.

Does the TPS23754PWPR support IEEE 802.3bt (PoE++)?

No-the TPS23754PWPR is compliant only with IEEE 802.3at (PoE+), supporting up to 30 W input power and Type 2 hardware classification. It lacks the four-pair detection, autoclass, and higher-power classification protocols defined in 802.3bt. For 802.3bt designs, TI recommends the TPS23721 or TPS23731. The TPS23754PWPR remains fully interoperable with 802.3bt PSEs operating in backward-compatible 802.3at mode, but cannot negotiate or utilize >30 W.