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Texas Instruments TPS25821DSST
- Part No.:
- TPS25821DSST
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
TPS25821DSST.pdf
- Description:
- IC INTERFACE SPECIALIZED 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:416
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Product details
Overview
TPS25821DSST from Texas Instruments is a USB Type-C 1.5-A source controller and integrated high-side power switch for Downstream Facing Port (DFP) applications. It monitors CC1/CC2 to detect sink attachment, advertises current capability (STD or 1.5-A), enables VBUS with 64-mΩ typical RDS(on), and provides SINK/POL/FAULT status signals. Designed for USB 2.0 host ports and data-less charging systems where VCONN is not required.
For engineers reviewing the TPS25821DSST datasheet, TPS25821DSST pinout, TPS25821DSST application, or TPS25821DSST equivalent, key selection criteria include its 1.7-A ±7% current limit accuracy, 1.5-µs overcurrent response, ±8-kV CC-line ESD rating, thermal shutdown thresholds at 135°C and 155°C, and WSON-12 package compatibility with space-constrained USB-C port designs.
Technical Context
The TPS25821DSST implements a USB Type-C Rel. 1.3–compliant DFP controller without VCONN support, distinguishing it from the TPS25820. It uses analog CC1/CC2 sensing to detect Rd termination, determine cable orientation via POL output, and assert SINK upon valid sink detection.
Its integrated 64-mΩ high-side MOSFET delivers 1.5-A sourcing capability with 1.7-A current limiting (±7% accuracy) and fast 1.5-µs fault response. The device draws only 1.0 µA (typ) in unattached state and features open-drain FAULT/SINK/POL outputs with 250-mV VOL at 1 mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBUS Current Limit | 1.7 A ±7% - ensures compliance with USB Type-C current advertisement modes and prevents sustained overload on connected cables or sinks. |
| RDS(on) | 64 mΩ (typ) at 25°C - minimizes conduction loss and thermal rise under 1.5-A continuous load in compact WSON-12 package. |
| Overcurrent Response Time | 1.5 µs (typ) - enables rapid current limiting before damage occurs during short-circuit events on VBUS line. |
| CC-Line ESD Rating | ±8 kV contact / ±15 kV air (IEC 61000-4-2) - protects configuration channel pins against real-world electrostatic discharge in end-user environments. |
| Quiescent Supply Current | 1.0 µA (typ) with no attachment - extends system standby time and reduces idle power in always-on USB-C host ports. |
| Thermal Shutdown Thresholds | 135°C (OUT switch disable) and 155°C (full device shutdown) - provides staged protection against thermal runaway during sustained overload or poor PCB heatsinking. |
| Operating Junction Temp | –40°C to +125°C - supports industrial and automotive-adjacent USB-C port implementations without derating. |
Pinout & Package
TPS25821DSST is housed in a 3.00 mm × 2.00 mm, 12-pin WSON package with exposed thermal pad for enhanced heat dissipation. Pin numbering follows standard top-view layout with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1,2) | Power input supply | Accepts 4.5–5.5 V bus input; powers internal circuitry and VBUS switch; dual-pin configuration reduces trace resistance and improves current handling. |
| CHG (Pin 3) | Current mode select input | Logic-high selects 1.5-A VBUS sourcing; logic-low selects STD (500/900 mA) mode per USB spec - sets current limit threshold and CC-line Rp value. |
| EN (Pin 4) | Enable control input | Active-high logic input enabling/disabling entire device; allows system-level power sequencing and dynamic port control. |
| FAULT (Pin 5) | Open-drain fault indicator | Asserts low on overcurrent or overtemperature; requires external 100-kΩ pull-up to IN; deglitched with 5.6–10.6 ms assertion delay. |
| SINK (Pin 6) | Open-drain sink detect output | Asserts low when Rd termination detected on CC1 or CC2 - confirms valid USB-C sink attachment for system firmware polling. |
| POL (Pin 7) | Open-drain polarity indicator | Asserts low when CC2 is active - signals cable orientation to enable correct SuperSpeed lane muxing in USB 3.x implementations. |
| REF (Pin 8) | Analog reference input | Connects to 100-kΩ precision resistor to GND; sets internal current reference for accurate CC-line voltage monitoring and current limit calibration. |
| CC1 (Pin 9) | Configuration channel I/O | Analog bidirectional pin for USB-C CC1 line; senses Rd/Ra terminations and sources Rp bias current per CHG setting. |
| GND (Pin 10) | Ground reference | Primary signal and power return path; must be low-impedance connection to PCB ground plane for noise immunity and thermal performance. |
| CC2 (Pin 11) | Configuration channel I/O | Analog bidirectional pin for USB-C CC2 line; works with CC1 to resolve cable flip and detect sink/cable presence. |
| OUT (Pin 12) | VBUS power switch output | Delivers regulated 5 V to USB-C receptacle VBUS pin; integrates 64-mΩ MOSFET with fast 0.8-ms turn-on and 1.3-ms turn-off timing. |
Key Features
| Feature | Design Value |
|---|---|
| USB Type-C Rel. 1.3 Compliance | Fully implements mandatory DFP functions including CC attach/detach detection, Rp advertisement, and VBUS discharge - eliminates need for external logic in certified USB-C ports. |
| 1.5-A Source Controller + Switch | Single-chip solution integrates CC monitoring, current-mode selection, and 64-mΩ VBUS switch - reduces BOM count and layout area vs discrete controller + MOSFET designs. |
| No VCONN Support | Differentiated from TPS25820 by omitting VCONN switch - simplifies design and lowers cost for USB 2.0 or charging-only applications where electronically marked cables are not used. |
| Ultra-Low Quiescent Current | 1.0 µA (typ) with no attachment - enables always-on USB-C detection in battery-powered docks, monitors, and portable chargers without significant standby drain. |
| Robust Fault Protection | Combined overcurrent (1.5 µs response) and dual-threshold thermal shutdown (135°C/155°C) - prevents field failures due to cable shorts or enclosure overheating. |
Applications
| USB 2.0 Host Port | USB-C Wall Charger |
|---|---|
Use Scenario: Notebook or desktop PC implementing USB-C downstream port without SuperSpeed data. IC Role / Device Role / Timing Role: DFP controller managing VBUS enable, CC-line negotiation, and sink detection - replaces discrete MCU + MOSFET + level-shifter solutions. Use Value: Reduces component count by 4+ parts while ensuring USB-IF compliance and eliminating firmware development for basic Type-C port control. | Use Scenario: Compact AC/DC adapter delivering 5 V/1.5 A to smartphones and accessories via USB-C. IC Role / Device Role / Timing Role: Standalone source controller providing standardized current advertisement and robust short-circuit protection on VBUS line. Use Value: Enables UL/IEC 62368-1 certification with built-in 1.7-A current limit accuracy and ±8-kV CC-line ESD protection - no external TVS or current-sense IC required. |
| Charging Docking Station | Data-Less Charging Cradle |
Use Scenario: Multi-port docking station supplying power to laptop and peripherals through single USB-C uplink. IC Role / Device Role / Timing Role: Dedicated DFP controller per downstream port - handles independent CC negotiation, VBUS enable, and fault reporting for each port. Use Value: Supports simultaneous charging of multiple devices with individual port-level protection and status signaling (SINK/FAULT) for system health monitoring. | Use Scenario: Automotive or industrial cradle that charges tablets or handheld devices without data transfer. IC Role / Device Role / Timing Role: Minimal-footprint USB-C source controller - performs only essential functions (attach detection, current broadcast, VBUS switching) with zero data-line interaction. Use Value: Eliminates unnecessary complexity and cost of USB 3.x PHY or PD controller - ideal for cost-sensitive, reliability-critical embedded charging applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB Type-C source controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS25820DSST | Includes integrated VCONN 250-mA switch and ±8-kV CC-line ESD; identical pinout and core DFP functionality. | Required for USB 3.1 DFP ports using electronically marked cables; not needed for USB 2.0 or charging-only use cases. | Select TPS25820DSST only if VCONN power delivery to active cables is mandatory; otherwise TPS25821DSST offers lower cost and simpler layout. |
| FPF2280SGMT | Single-channel 5-V load switch (no CC logic); lacks USB-C controller functions (CC detection, POL, SINK, CHG control). | Only suitable as basic VBUS switch in systems with external MCU-based Type-C management - adds firmware and component overhead. | Choose FPF2280SGMT only when full USB-C compliance is unnecessary and system already implements CC logic in software; TPS25821DSST provides complete hardware-managed DFP functionality. |
Compared with TPS25820DSST, TPS25821DSST removes VCONN support to reduce cost and complexity for USB 2.0/data-less applications; compared with FPF2280SGMT, it delivers full hardware-based USB-C DFP control - eliminating MCU firmware dependencies and ensuring specification compliance out-of-box.
Availability
TPS25821DSST is available at Aetrix Electronics and suitable for USB 2.0 host ports, USB-C wall chargers, and charging docking stations requiring stable component supply, long-term lifecycle assurance, and full USB-IF specification compliance.
Supply support for TPS25821DSST 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 decades of USB interface expertise.
The TPS2582x product line delivers integrated USB Type-C DFP controllers for host-side applications, designed specifically to simplify compliance-critical USB-C port implementation in PCs, chargers, and docks without requiring USB Power Delivery or SuperSpeed data support.
FAQ
What is the primary function of the TPS25821DSST in a USB-C system?
The TPS25821DSST serves as a USB Type-C Downstream Facing Port (DFP) source controller with integrated VBUS power switch. It detects sink attachment via CC1/CC2 lines, advertises current capability (STD or 1.5-A), enables VBUS with 64-mΩ RDS(on), and provides SINK/POL/FAULT status signals - all without VCONN support. Its core role is hardware-managed USB-C port control for USB 2.0 and charging-only applications.
Does the TPS25821DSST support VCONN power delivery?
No, the TPS25821DSST does not support VCONN power delivery. Unlike the TPS25820DSST, it omits the VCONN current-limiting switch and associated control logic. This makes the TPS25821DSST suitable exclusively for USB 2.0 DFP ports or data-less charging implementations where electronically marked cables are not used - reducing cost and complexity versus VCONN-capable variants.
How does the CHG pin configure current sourcing capability on the TPS25821DSST?
The CHG pin on the TPS25821DSST selects between two USB Type-C current advertisement modes: logic-low configures STD mode (500 mA for USB 2.0 or 900 mA for USB 3.1), while logic-high configures 1.5-A mode. This selection directly sets both the Rp pull-up resistance on CC lines and the internal 1.7-A ±7% current limit threshold on the VBUS switch - ensuring coordinated advertisement and protection per USB specification.
What thermal protection mechanisms does the TPS25821DSST implement?
The TPS25821DSST implements dual-threshold thermal shutdown: at 135°C, the VBUS switch disables while control logic remains active; at 155°C, full device shutdown occurs with all open-drain outputs placed in high-impedance state. Both thresholds include 20°C hysteresis for stable auto-recovery. These protections prevent permanent damage during sustained overload or inadequate PCB heatsinking - critical for enclosed USB-C charger and dock applications.
Can the TPS25821DSST be used in USB 3.x SuperSpeed applications?
Yes, the TPS25821DSST supports USB 3.x SuperSpeed applications through its POL output, which signals cable orientation (CC1 or CC2 active) to enable correct routing of SuperSpeed differential pairs. However, it does not manage SuperSpeed data lanes directly - those remain handled by a separate USB 3.x transceiver. The TPS25821DSST's role is strictly DFP control: VBUS enable, CC negotiation, and status signaling - making it compatible with USB 3.x host ports when paired with appropriate PHY hardware.
TPS25821DSST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller
- Interface:
- USB
- Voltage - Supply:
- 4.5V ~ 5.5V
- Supplier Device Package:
- 12-WSON (3x2)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
TPS25821DSST FAQ
1.How can I place an order for TPS25821DSST through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS25821DSST 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 TPS25821DSST reliable?
The price and inventory of TPS25821DSST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS25821DSST is usually 5 days.
3.What payment methods are accepted for TPS25821DSST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS25821DSST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS25821DSST?
TPS25821DSST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS25821DSST 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 TPS25821DSST?
For technical support, including TPS25821DSST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS25821DSST requirements.
6.How does Aetrix verify that TPS25821DSST is sourced from the original manufacturer or authorized distributors?
All TPS25821DSST 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 TPS25821DSST meets industry standards.
7.What is the process for return or replacement of TPS25821DSST?
All TPS25821DSST units undergo pre-shipment inspection (PSI). If there is an issue with TPS25821DSST, 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 TPS25821DSST part is unused and in its original packaging.
Return procedure for TPS25821DSST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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