Texas Instruments TPS2051BQDRQ1

Overview

TPS2051BQDRQ1 from Texas Instruments is an automotive-grade, single-channel high-side power-distribution switch with integrated 105-mΩ N-channel MOSFET, 500-mA continuous current rating, thermal/short-circuit protection, and 2.7 V to 5.5 V input operation - used in USB port power management and infotainment module rail switching.

For engineers reviewing the TPS2051BQDRQ1 datasheet, TPS2051BQDRQ1 pinout, TPS2051BQDRQ1 application, or TPS2051BQDRQ1 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (–40°C to 125°C), accurate 0.75–1.25 A current-limit window, undervoltage lockout at ~2.0 V, deglitched OC fault reporting, and <1 µA standby supply current in disabled state.

Technical Context

The TPS2051BQDRQ1 implements a charge-pump–driven high-side N-channel MOSFET switch with active current limiting and thermal shutdown. Its enable logic is active-high, distinguishing it from the active-low TPS2041B-Q1 family members.

It integrates a sense FET for current monitoring without external shunt resistors, delivers controlled 0.6-ms typical rise time to limit inrush, and features a 10-ms deglitch on the open-drain OC output to suppress false fault assertions during capacitive load turn-on or transient events.

Key Specifications

Pinout & Package

TPS2051BQDRQ1 is housed in an SOIC-8 (D) package measuring 4.90 mm × 6.00 mm, optimized for automotive PCB layouts requiring thermal reliability and creepage clearance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2041BQDBVRQ1, the TPS2051BQDRQ1 offers higher thermal margin via SOIC-8 packaging and active-high enable compatibility with modern MCU GPIOs; versus TPS2553DDBVR, it delivers guaranteed automotive reliability but with fixed current threshold and no adjustability.

Availability

TPS2051BQDRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, telematics control units, and body electronics modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS2051BQDRQ1 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The TPS20xxB-Q1 product line was designed specifically for automotive power-distribution applications requiring AEC-Q100 qualification, precise current limiting, and robust fault handling in 12 V and 5 V subsystems.

FAQ

What is the enable logic polarity of the TPS2051BQDRQ1?

The TPS2051BQDRQ1 uses active-high enable logic: applying a logic high (≥2 V) to the EN pin turns on the internal power switch, while a logic low disables it and reduces supply current to ≤1 µA. This differs from the TPS2041B-Q1, which uses active-low enable - confirming correct control signal mapping is essential during schematic review and firmware initialization of the TPS2051BQDRQ1.

Does the TPS2051BQDRQ1 support bidirectional current flow?

No, the TPS2051BQDRQ1 is a unidirectional high-side switch. It blocks reverse current from OUT to IN when disabled, but does not allow forward conduction from OUT to IN under any condition. Its internal N-channel MOSFET architecture and charge-pump design enforce strict source-to-drain current directionality - making it unsuitable for back-to-back configurations or true bidirectional power routing.

What is the purpose of the dual IN pins (2 and 3) and triple OUT pins (6, 7, 8) on the TPS2051BQDRQ1?

Pins 2 and 3 are internally paralleled input connections to reduce package inductance and improve current sharing into the charge pump and MOSFET source. Pins 6, 7, and 8 are internally paralleled output terminals to lower effective bond-wire and trace resistance, enabling reliable 500 mA delivery with minimized voltage drop and thermal rise - critical for automotive applications where thermal margin and voltage regulation are tightly constrained.

How does the OC pin behave during thermal shutdown versus overcurrent events?

The OC pin of the TPS2051BQDRQ1 is asserted low (open-drain) for both overcurrent and thermal shutdown events, with identical electrical behavior. However, thermal shutdown occurs only after sustained overload raises junction temperature to ~135°C, while overcurrent trips within microseconds once load current exceeds the 0.75–1.25 A window. The 10-ms deglitch applies only to overcurrent assertion - thermal shutdown triggers OC immediately without delay.

Is the TPS2051BQDRQ1 compatible with 3.3 V microcontroller GPIOs driving the EN pin?

Yes - the TPS2051BQDRQ1's EN input accepts TTL- and CMOS-compatible logic levels: VIH ≥ 2.0 V (min) and VIL ≤ 0.8 V (max) across the full operating temperature range. A 3.3 V MCU GPIO satisfies the VIH requirement with >1.3 V noise margin, ensuring robust enable/disable control without level-shifting circuitry when interfacing with the TPS2051BQDRQ1.