Texas Instruments TPS2042BDGN

Overview

TPS2042BDGN from Texas Instruments is a dual-channel, current-limited power-distribution switch featuring two 70mΩ high-side N-channel MOSFETs, 500mA continuous output per channel, thermal and short-circuit protection, and operation from 2.7V to 5.5V. It serves as a smart load switch in USB-powered peripherals and embedded systems requiring controlled power sequencing and fault resilience.

For engineers reviewing the TPS2042BDGN datasheet, TPS2042BDGN pinout, TPS2042BDGN application, or TPS2042BDGN equivalent, key selection criteria include per-channel current limiting (0.75A–1.25A), fast 0.6ms typical rise time, undervoltage lockout (2.0V–2.6V), deglitched OC reporting, and HVSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The TPS2042BDGN integrates an internal charge pump to drive the gate of each 70mΩ N-channel MOSFET, enabling full enhancement down to 2.7V input while controlling rise/fall times to suppress inrush current. Each channel operates independently with logic-level enable inputs (active-low for TPS204xB series).

Fault management includes accurate current limiting (typical 1A trip), open-drain OCx outputs that remain stable during power-up, and thermal shutdown at 135°C with 10°C hysteresis. Recovery is automatic after junction cooling below 125°C, and UVLO ensures switch remains off until valid input voltage is established.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package: 3.00mm × 3.00mm body, exposed PowerPAD™ thermally connected to GND for enhanced PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel power-switch applications.

Compared with TPS2042BDGN, TPS2042BDRB offers superior thermal resistance for high-reliability applications, while TPS2052BDGN provides identical functionality with inverted enable polarity-both retain the same 70mΩ on-resistance, 500mA rating, and UL recognition without layout changes.

Availability

TPS2042BDGN is available at Aetrix Electronics and suitable for USB peripheral hubs, industrial I/O modules, and embedded carrier boards requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical and industrial certifications.

Supply support for TPS2042BDGN 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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power-switching solutions.

The TPS20xxB family was designed specifically for USB-compliant and industrial power-distribution applications where heavy capacitive loads, short circuits, and hot-plug events demand robust, integrated current limiting and thermal protection.

FAQ

What is the maximum continuous current per channel for the TPS2042BDGN?

The TPS2042BDGN supports 500mA continuous output current per channel under recommended operating conditions (2.7V–5.5V input, –40°C to 85°C ambient). This rating is maintained across the full voltage range and is enforced by internal current limiting, not derated for temperature unless thermal limits are approached. The TPS2042BDGN datasheet specifies this value in Section 6.3 Recommended Operating Conditions.

Does the TPS2042BDGN require external components for gate drive or current sensing?

No, the TPS2042BDGN does not require external components for gate drive or current sensing. Its integrated charge pump enables full MOSFET enhancement from 2.7V input, and its accurate current-limit circuit (0.75A–1.25A) operates autonomously without external resistors or sense amplifiers. Only local 0.1µF input decoupling is required per the TPS2042BDGN application schematic in the datasheet.

How does the TPS2042BDGN handle short-circuit conditions?

Under short-circuit conditions, the TPS2042BDGN immediately enters constant-current mode, limiting output current to the programmed threshold (typically 1A). If the overload persists, junction temperature rises until thermal shutdown activates at 135°C, turning off both channels. Recovery occurs automatically once the die cools below 125°C. The OC1 and OC2 pins assert low during either event, providing direct fault signaling to the host system.

What is the purpose of the deglitched OC output in the TPS2042BDGN?

The deglitched OC output in the TPS2042BDGN filters transient overcurrent events with a 4–15ms assertion/deassertion delay, preventing false fault interrupts caused by brief inrush surges or noise spikes. This ensures only sustained overloads or genuine shorts trigger the OC signal, improving system stability in electrically noisy environments like industrial motor controls or USB hubs with multiple hot-plug devices.

Can the TPS2042BDGN be used with a 2.7V input supply?

Yes, the TPS2042BDGN is fully specified for operation down to 2.7V input. Its charge pump maintains sufficient gate drive to achieve 75mΩ typical rDS(on) at 2.7V, and all protections-including current limiting, UVLO (2.0V–2.6V threshold), and thermal shutdown-remain functional. The TPS2042BDGN is commonly deployed in single-cell Li-ion (3.0V–4.2V) and low-voltage industrial systems where 2.7V represents the minimum brownout condition.