Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Channels | 1 high-side power switch |
| Rated Load | 0.5 A class |
| Input | 4.5 V to 5.5 V for exact TPS2051C use case |
| Current Limit | Fixed ±20%-accuracy constant-current limiting family architecture |
| Response | 2 µs stated fast overcurrent response |
| Protection | Reverse-current blocking, built-in soft start and thermal protection |
| Output State | TPS20xxC variants include output discharge |
| Exact Package / Packing | SOT-23 (DBV), 5 pins; 3000-piece large reel; marking VBYQ |
Product Overview
TPS2051CDBVR is the newer 0.5-A USB power-switch generation with tighter fixed current limiting, fast overload response, reverse-current blocking and output discharge. It is optimized around the 5 V USB supply range rather than the broader 2.7–5.5 V range of TPS2051B.
Reverse blocking helps prevent an externally powered downstream node from feeding current back into the upstream 5 V rail. Output discharge actively brings the port down after disable, which can improve deterministic power cycling.
Those C-generation behaviors are system-level differences, not marketing decoration. A board migrating from TPS2051B should verify supply range, fault timing and disable-state expectations.
For related devices, see HKEQGOO’s Power Distribution Switches, Load Drivers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TPS2051CDBVR |
| Channels | 1 high-side power switch |
| Rated Load | 0.5 A class |
| Input | 4.5 V to 5.5 V for exact TPS2051C use case |
| Current Limit | Fixed ±20%-accuracy constant-current limiting family architecture |
| Response | 2 µs stated fast overcurrent response |
| Protection | Reverse-current blocking, built-in soft start and thermal protection |
| Output State | TPS20xxC variants include output discharge |
| Exact Package / Packing | SOT-23 (DBV), 5 pins; 3000-piece large reel; marking VBYQ |
| Manufacturer Status | Active / Production |
| Part Marking | VBYQ |
Functional Highlights
Reverse-current blocking protects multi-source USB/power paths
An externally energized load or cable is less likely to back-power the host rail through the switch.
Fast fixed current limit reduces upstream rail disturbance
A short is constrained quickly, helping the main 5 V supply remain regulated for other ports/devices.
Design Considerations
- Keep VIN within the exact C-generation operating range.
- Verify output-discharge behavior is safe for any downstream energy-storage or shared-rail connection.
- Size thermal copper for repeated current-limit events; protection is not a substitute for fault-duty analysis.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TPS2051CDBVR as Active / Production; SOT-23 (DBV), 5 pins; 3000-piece large tape and reel; −40°C to +125°C; marking VBYQ.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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