Texas Instruments TPS2550DRVR

Overview

TPS2550DRVR from Texas Instruments is a 6-pin adjustable current-limited high-side power-distribution switch featuring an N-channel MOSFET with 100 mΩ typical r_DS(on) (DRV package), 2.5–6.5 V input range, and user-programmable current limit from 100 mA to 1.1 A via external resistor. It delivers fast 2 μs overcurrent response, reverse-input-output voltage protection, and integrated soft-start for USB port and heavy capacitive load switching.

For engineers reviewing the TPS2550DRVR datasheet, TPS2550DRVR pinout, TPS2550DRVR application, or TPS2550DRVR equivalent, key selection criteria include its active-low enable logic, 1-μA standby supply current, deglitched FAULT reporting, thermal shutdown at 135 °C (current-limit mode) and 155 °C (absolute), and compatibility with 0.1 μF input bypassing per TI's recommended layout.

Technical Context

The TPS2550DRVR integrates an internal charge pump to drive the N-channel MOSFET gate above the source rail, enabling full enhancement down to 2.5 V input. Its current-limit threshold is set by an external resistor on the ILIM pin, with independent short-circuit (IOS) and overcurrent (IOC) thresholds defined by process- and temperature-dependent equations.

It implements dual deglitch timers-7.5 ms for overcurrent/FAULT assertion and 4 ms for reverse-voltage detection-plus undervoltage lockout (2.45 V turn-on, 25 mV hysteresis) and two-stage thermal protection: foldback shutdown at 135 °C during current limiting and hard shutdown at 155 °C regardless of operating mode.

Key Specifications

Pinout & Package

TPS2550DRVR uses a 6-pin WSON package (2.00 mm × 2.00 mm) with exposed PowerPAD™ thermally connected to GND. The package supports high-K PCB layouts for up to 1330 mW power dissipation at 25 °C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-limited power-switch applications.

Compared with TPS2551DRVR, TPS2550DRVR offers direct enable compatibility with legacy low-active control logic, while TPD3S014RTER trades reverse-voltage blocking for integrated data-line protection - making TPS2550DRVR optimal for isolated power-rail switching where backfeed prevention is critical.

Availability

TPS2550DRVR is available at Aetrix Electronics and suitable for USB ports/hubs, cell phone peripheral interfaces, and laptop docking station power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2550DRVR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS255x family is designed specifically for robust, programmable power-distribution switching in USB, portable, and embedded systems where short-circuit resilience, reverse-voltage blocking, and ultra-low quiescent current are essential.

FAQ

What is the correct external resistor value to set TPS2550DRVR current limit to 500 mA?

To achieve a nominal 500 mA overcurrent threshold (IOC) with TPS2550DRVR, use a 47.5 kΩ resistor between ILIM and GND. Per TI's IOC(typ) equation (23800 V / R_ILIM(kΩ)^0.985 + 50), this yields ~498 mA at 25 °C. Confirm final value using TI's SLVC163 calculator and validate across temperature with the IOC(min)/IOC(max) curves in Figure 9-1 of the datasheet.

Does TPS2550DRVR require an external capacitor on the FAULT pin?

No, TPS2550DRVR does not require an external capacitor on the FAULT pin. The FAULT output is an open-drain logic signal with built-in 7.5 ms deglitch timing for overcurrent and 4 ms for reverse-voltage conditions. A pull-up resistor (typically 10 kΩ to V_CC) is required, but no capacitor is needed - the deglitch is fully internal and eliminates false triggering during capacitive inrush.

Can TPS2550DRVR operate with a 2.7 V input supply?

Yes, TPS2550DRVR operates reliably with a 2.7 V input supply. Its specified input range is 2.5 V to 6.5 V, and the internal charge pump functions down to 2.5 V. At 2.7 V, r_DS(on) increases slightly (to ~115 mΩ typ per Figure 7-16), and rise/fall times extend modestly (tr = 0.65–1.0 ms), but all protections - including UVLO (2.45 V turn-on), current limiting, and thermal shutdown - remain fully functional.

How does reverse-voltage protection work on TPS2550DRVR, and what is its response time?

TPS2550DRVR disables its internal N-MOSFET when V_OUT exceeds V_IN by 135 mV (typical), preventing backfeed current into the input rail. The comparator asserts FAULT after a 4 ms deglitch delay, and the MOSFET turns off within 3–7 ms (typical) of the reverse condition onset. Recovery occurs only after V_OUT falls below V_IN for another 4 ms, ensuring stable re-enablement without oscillation.

Is the PowerPAD™ on TPS2550DRVR electrically connected, and how should it be routed?

Yes, the PowerPAD™ on TPS2550DRVR is internally connected to GND and must be soldered to a dedicated PCB copper pour tied directly to the system GND plane. TI recommends a minimum 12×12 mm thermal pad with ≥4 thermal vias (0.3 mm diameter) to inner ground layers. This routing achieves θ_JA = 75 °C/W on high-K boards, enabling 1330 mW power dissipation at 25 °C ambient - critical for sustained 1.1 A operation.