Texas Instruments TPS25820DSSR

Overview

TPS25820DSSR from Texas Instruments is a USB Type-C 1.5-A source controller and integrated power switch for DFP (Downstream Facing Port) applications. It provides VBUS sourcing, CC-line-based sink detection, SuperSpeed polarity determination (via POL), and - uniquely among its family - VCONN power delivery with internal current limiting. It features 64-mΩ typical R_DS(on), ±8-kV CC-line ESD protection, and 1.7-A ±7% accurate current limiting for USB-compliant operation in notebook, docking station, and wall charger designs.

For engineers reviewing the TPS25820DSSR datasheet, TPS25820DSSR pinout, TPS25820DSSR application, or TPS25820DSSR equivalent, key selection considerations include VCONN support (distinguishing it from TPS25821), thermal shutdown thresholds (135°C/155°C), open-drain status signaling (FAULT/SINK/POL), WSON-12 package constraints, and compliance with USB Type-C Rev 1.3 discharge requirements.

Technical Context

The TPS25820DSSR implements full USB Type-C Rev 1.3 source functionality: dual CC-line monitoring for attach/detach detection and cable orientation resolution, programmable current advertisement (STD/1.5-A via CHG pin), and automatic VCONN enablement for electronically marked cables. Its control logic drives an integrated high-side MOSFET for VBUS switching and a separate VCONN switch (480-mΩ typical R_DS(on) at 25°C).

It operates with 1.0-µA quiescent current when unattached, enters current limit within 1.5 µs of overload, and asserts FAULT on overcurrent or overtemperature events with deglitch timing (5.6–10.6 ms). Thermal protection includes two-tier shutdown: OUT/VCONN disable at 135°C and full device disable at 155°C, both with 20°C hysteresis.

Key Specifications

Pinout & Package

TPS25820DSSR is housed in a 3.00 mm × 2.00 mm, 12-pin WSON package (DSS) with exposed thermal pad for enhanced thermal dissipation (R_θJB = 24.1°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB Type-C source controller applications.

Compared with TPS25820DSSR, TPS25821DSSR removes VCONN support but retains identical VBUS performance and footprint - ideal for cost-sensitive USB 2.0 hosts. TPS65987DMLR adds full PD protocol stack and higher power, making it over-specified for basic 5-V/1.5-A applications where TPS25820DSSR delivers optimal integration and simplicity.

Availability

TPS25820DSSR is available at Aetrix Electronics and suitable for USB 3.x host ports, notebook docking stations, and USB wall chargers requiring stable component supply, long-term lifecycle assurance, and production-ready qualification.

Supply support for TPS25820DSSR 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, embedded processing, and connectivity technologies, with decades of leadership in USB interface solutions.

The TPS25820DSSR belongs to TI's USB Type-C source controller product line, designed specifically for cost-optimized, non-PD DFP implementations requiring integrated VBUS switching, CC-line management, and VCONN support in space-constrained applications.

FAQ

What is the primary function of the TPS25820DSSR in a USB Type-C system?

The TPS25820DSSR serves as a dedicated USB Type-C Downstream Facing Port (DFP) source controller with integrated power switches. It manages VBUS power delivery, detects sink attachment via CC-line monitoring, determines cable orientation using the POL output, and - uniquely - supplies and regulates VCONN power for electronically marked cables. Its design eliminates the need for external discrete components in compliant 5-V/1.5-A source applications, and the TPS25820DSSR is explicitly rated for USB Type-C Rev 1.3, including mandatory VCONN discharge behavior.

How does the TPS25820DSSR differ from the TPS25821DSSR?

The TPS25820DSSR includes a fully integrated VCONN power switch and discharge circuitry, enabling native support for electronically marked cables per USB Type-C Rev 1.3. The TPS25821DSSR omits this functionality entirely - it shares identical pinout, VBUS switching specs (64-mΩ R_DS(on), 1.7-A limit), and CC-line logic but cannot supply VCONN. This makes the TPS25820DSSR mandatory for USB 3.1 Gen1/Gen2 applications requiring active cables, while the TPS25821DSSR suffices for USB 2.0 or data-less charging where VCONN is unused. Both use the same WSON-12 (DSS) package.

What role does the CHG pin play in configuring the TPS25820DSSR?

The CHG pin on the TPS25820DSSR selects the advertised USB Type-C current capability: logic LOW configures standard mode (500 mA for USB 2.0 or 900 mA for USB 3.1), while logic HIGH enables 1.5-A mode. This selection directly sets the internal current-limit threshold - the device maintains a fixed 1.7-A ±7% limit regardless of CHG state to ensure robust overload protection. The TPS25820DSSR uses this pin to comply with USB spec-defined broadcast levels without requiring external resistors or firmware intervention.

Can the TPS25820DSSR be used in systems requiring USB Power Delivery (PD) beyond 5 V?

No, the TPS25820DSSR is not a USB Power Delivery (PD) controller and does not support voltage negotiation above 5 V or PD communication protocols. It is designed exclusively for fixed 5-V source applications compliant with the base USB Type-C specification (Rev 1.3), handling only the CC-line signaling for current advertisement (STD/1.5-A) and VCONN management. For systems requiring 9-V, 15-V, or 20-V sourcing, a dedicated PD controller such as the TPS65987DMLR must be used - the TPS25820DSSR cannot substitute for PD functionality.

How does the FAULT pin behave during overcurrent and overtemperature events?

The FAULT pin on the TPS25820DSSR is an open-drain output that asserts LOW after a deglitch period (5.6–10.6 ms) when either the VBUS output exceeds its 1.7-A current limit or the junction temperature crosses 155°C. It remains asserted until the fault condition clears for a de-deglitch interval (also 5.6–10.6 ms). During overtemperature events between 135°C and 155°C, only the VBUS and VCONN switches disable - FAULT stays deasserted. This dual-threshold behavior ensures FAULT reflects only critical failures requiring system-level response, and the TPS25820DSSR's FAULT pin is electrically compatible with standard 3.3-V or 5-V microcontroller interrupt inputs.