Texas Instruments TPS23757PW

Overview

TPS23757PW from Texas Instruments is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode DC/DC controller optimized for isolated flyback and active-clamp forward converters. It supports IEEE 802.3at Type 1 (13 W) PD operation, integrates a robust 100 V, 0.5 Ω hot-swap MOSFET, and delivers up to 78% maximum duty cycle with dual complementary gate drivers. It enables adapter ORing with external wall adapters (e.g., 12 V), used in VoIP phones and security cameras requiring PoE + adapter fallback.

For engineers reviewing the TPS23757PW datasheet, TPS23757PW pinout, TPS23757PW application, or TPS23757PW equivalent, key selection considerations include its dual-gate driver timing control, programmable 50–937 kHz switching frequency, 465 mA PoE current limit, 9 V converter startup capability, and TSSOP-20 package compatibility with TPS23754/6.

Technical Context

The TPS23757PW implements a two-stage architecture: a PoE interface with IEEE 802.3at-compliant detection, classification (programmable via CLS resistor), and hot-swap control (RTN switch with 0.43 Ω typical R_DS(on)), plus a synchronous current-mode DC/DC controller featuring dual gate drivers (GATE/GAT2), programmable dead time (via DT pin), and internal slope compensation (155 mV). Its bootstrap startup source enables operation from 12 V wall adapters without auxiliary winding dependency.

Control logic includes adaptive ORing management between PoE and external adapters (via APD/PPD pins), accurate current-sense blanking (programmable via BLNK), soft-start (3.9 ms typical), and thermal shutdown at 145 °C. The CTL input accepts optocoupler feedback with 0.5 VCSMAX scaling, while VB provides a regulated 5.1 V rail for feedback circuitry.

Key Specifications

Pinout & Package

TSSOP-20 package (PWP), 0.65 mm pitch, thermally enhanced with exposed pad; industry-standard footprint compatible with TPS23754/6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS23754PW, the TPS23757PW adds 33% higher current capability and full adapter ORing logic; versus LT4275AIMSE#TRPBF, it reduces total solution size by integrating both functions into one TSSOP-20 package with shared bias resources.

Availability

TPS23757PW is available at Aetrix Electronics and suitable for VoIP telephony, security camera systems, and industrial IoT gateways requiring stable component supply, long-lifecycle support, and guaranteed PoE compliance.

Supply support for TPS23757PW 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 power management innovation.

The TPS23757PW belongs to TI's Power over Ethernet product line, designed specifically to integrate IEEE-compliant PD interface functionality with high-efficiency isolated DC/DC control for space- and cost-constrained endpoint devices.

FAQ

What is the maximum PoE input voltage supported by the TPS23757PW?

The TPS23757PW supports an absolute maximum PoE input voltage of 100 V on ARTN, COM, DEN, PPD, RTN, VDD, and VDD1 pins. Its recommended operating range is 0–57 V, fully covering IEEE 802.3at Type 1 specifications and accommodating worst-case PSE tolerances. This ensures robust operation across diverse enterprise and industrial PSE implementations without external clamping beyond the required TVS diode.

How does the TPS23757PW implement adapter ORing functionality?

The TPS23757PW implements adapter ORing using dedicated APD and PPD inputs that monitor external adapter voltage. When APD exceeds 1.5 V relative to ARTN, the internal hot-swap MOSFET opens, disabling PoE power and asserting APb to enable the adapter path. PPD provides a second threshold (1.55 V and 8.3 V) to qualify adapter voltage before enabling classification, ensuring seamless, glitch-free switchover without external diodes or controllers.

Can the TPS23757PW drive synchronous rectifiers in a flyback topology?

Yes, the TPS23757PW can drive synchronous rectifiers in flyback topology using its GAT2 output. GAT2 operates complementarily to GATE with programmable dead time (via DT pin), turning the secondary-side MOSFET OFF when high and ON when low. This timing aligns with flyback reset phase, enabling high-efficiency synchronous rectification without external timing circuits or gate drivers.

What is the purpose of the BLNK pin on the TPS23757PW?

The BLNK pin on the TPS23757PW configures current-sense blanking delay to suppress gate-drive-induced transients on the CS pin. Connecting BLNK to ARTN enables a fixed 55 ns blanking period; adding a resistor (e.g., 249 kΩ) programs a more precise value (e.g., 70 ns). This prevents false current-limit triggering during MOSFET turn-on, improving loop stability and enabling use of smaller RCS sense resistors without filtering compromises.

Is the TPS23757PW pin-compatible with other members of the TPS2375x family?

Yes, the TPS23757PW is pin-compatible with TPS23754PW and TPS23756PW in the TSSOP-20 (PWP) package. All share identical pin assignments for core functions (RTN, GATE, CS, CTL, VB, etc.), enabling direct PCB-level replacement. However, TPS23757PW-specific features like APD/PPD logic and higher current limit require validation of external resistor networks and thermal design when upgrading from earlier variants.