Single-channel high-side switch with integrated protection
The Texas Instruments TPS2055D is a single-channel, high-side N-channel power distribution switch in an 8-SOIC surface-mount package. It delivers up to 250 mA continuous output from a load supply of 2.7 V to 5.5 V, with a typical on-resistance of 80 mOhm. The switch is controlled by an On/Off logic input (non-inverting) and requires no separate Vcc supply — the gate drive is self-biased from the load voltage. Built-in fault protection includes fixed current limiting, over-temperature shutdown, and undervoltage lockout (UVLO), with a status flag output to signal fault conditions to the host controller. The operating junction temperature range of -40°C to 125°C suits industrial, automotive, and outdoor equipment environments where the switch must handle variable ambient temperatures and moderate loads.
Fault protection set: current limit, thermal shutdown, UVLO
The TPS2055D integrates three protection mechanisms that reduce external component count. Current limiting is fixed (non-adjustable) and engages when the output exceeds the threshold, holding the current to a safe level. Over-temperature shutdown (OTP) protects the die if the junction exceeds the thermal limit — the switch latches off and the status flag asserts. UVLO disables the switch if the input voltage drops below the minimum operating level, preventing the pass FET from operating in its linear region. The status flag output (open-drain, active low) can drive a GPIO or interrupt input on the system controller for diagnostic feedback.
Active lifecycle — no LTB risk for production BOMs
The TPS2055D carries an Active product status with ROHS3 compliance.