Package and board-fit for the TPS2051BD
The TPS2051BD comes in an 8-SOIC package (0.154", 3.90mm width) with a supplier device package designation of 8-SOIC. The 70 mOhm typical Rds(on) at 500 mA dissipates about 17.5 mW — negligible thermal load for the SOIC package, but the copper trace width to the output pin should be sized for the full 500 mA continuous current without exceeding a 10°C temperature rise in still air.
What the 500 mA and 70 mOhm ratings mean for your rail
The 500 mA maximum continuous output is the switch's current ceiling — below this the internal N-channel FET operates within its safe operating area. This simplifies the BOM by eliminating a bias regulator, but it also means the switch's internal charge pump must have enough headroom; below 2.7 V the gate drive may not fully enhance the FET, increasing Rds(on) beyond the typical value.
Protection features and the status flag output
Fault protection includes fixed current limiting, over-temperature shutdown, and under-voltage lockout (UVLO). The current limit is fixed internally — no external resistor sets the threshold — so the switch will fold back the output current rather than latching off during a transient overload. The over-temperature shutdown protects against sustained short circuits; once the die cools, the switch auto-recovers. The status flag output (open-drain, active low) asserts when the switch is in current-limit or thermal-shutdown. It pulls low to indicate a fault condition and releases when the fault clears.
Sourcing and compliance for the TPS2051BD
The device ships in Tube packaging — the standard 8-SOIC tube quantity is typically 95 or 100 units per tube, though the exact count is confirmed at order. The base product number TPS2051 covers multiple output-current variants (500 mA, 1 A) and package options — confirm the specific suffix BD for the 8-SOIC version before committing the line.