Texas Instruments TPS2046ADR

Overview

TPS2046ADR from Texas Instruments is a dual-channel, current-limited, high-side N-channel MOSFET power-distribution switch in an SOIC-8 package. It delivers 250 mA per channel, features independent enable inputs (active-low for TPS2046A), 80-mΩ typical R_DS(on) at 5 V, overcurrent and thermal protection with open-drain OC outputs, and operates from 2.7 V to 5.5 V - used in USB peripheral power management and hot-swap circuits.

For engineers reviewing the TPS2046ADR datasheet, TPS2046ADR pinout, TPS2046ADR application, or TPS2046ADR equivalent, key selection criteria include per-channel current limit (250 mA), enable logic polarity (active-low), thermal shutdown behavior (140°C trip, ~20°C hysteresis), rise/fall time control (2.5 ms typical), and SOIC-8 footprint compatibility with board-level thermal design constraints.

Technical Context

The TPS2046ADR integrates two independent high-side power switches, each with an internal charge pump enabling full gate drive down to 2.7 V input. Each channel includes dedicated current-sense FETs and thermal sensing circuitry, allowing independent fault detection and constant-current limiting during overload without affecting the other channel.

Its enable inputs (EN1, EN2) are active-low for the TPS2046A series and directly interface with TTL/CMOS logic. The OC1 and OC2 outputs are open-drain, active-low signals that assert simultaneously upon overcurrent or thermal fault on their respective channels, supporting system-level fault monitoring and sequencing control.

Key Specifications

Pinout & Package

TPS2046ADR is housed in an 8-pin SOIC (D) package with exposed pad (not thermally enhanced per datasheet). Pin functions are validated per TI SLVS251C Rev. January 2008.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2056ADR, TPS2046ADR offers native active-low enable compatibility with legacy GPIOs and direct replacement where pull-down reset schemes exist; versus AP2152AMPG-13, it provides essential fault visibility via OC outputs and tighter thermal management for sustained 250 mA loads in compact layouts.

Availability

TPS2046ADR is available at Aetrix Electronics and suitable for USB power distribution, industrial I/O protection, and embedded hot-swap applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2046ADR 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 TPS204xA family was designed specifically for robust, current-limited power distribution in systems prone to heavy capacitive loads and short circuits - emphasizing independent channel protection, low quiescent power, and seamless integration into USB and hot-plug architectures.

FAQ

What is the enable logic polarity for TPS2046ADR?

The TPS2046ADR uses active-low enable inputs: EN1 and EN2 must be driven low to turn on their respective channels. This is confirmed in the Terminal Functions table (page 6) and functional block diagram for TPS2046A. The TPS2056A variant uses active-high enables - do not substitute without verifying control signal polarity. TPS2046ADR's active-low design simplifies interfacing with open-drain or push-pull outputs configured for low-active reset logic.

Does TPS2046ADR support bidirectional current flow?

No, TPS2046ADR is a unidirectional high-side switch. Its N-channel MOSFET architecture blocks reverse current from OUT to IN, which is essential for hot-swap safety and preventing backfeeding. The datasheet explicitly states "Configured as a high-side switch, the power switch prevents current flow from OUT to IN and IN to OUT when disabled." This makes TPS2046ADR unsuitable for applications requiring reverse power transfer or battery backup paths.

What is the maximum continuous current per channel for TPS2046ADR?

The maximum continuous output current per channel for TPS2046ADR is 250 mA, as specified in the Recommended Operating Conditions table (page 9) and confirmed in the DETAILED DESCRIPTION (page 7). This rating applies across the full 2.7 V to 5.5 V input range and ambient temperature range (0°C to 85°C). Exceeding this current triggers current-limit mode; sustained overload may activate thermal shutdown at ~140°C junction temperature.

How does the OC output behave during a fault condition on TPS2046ADR?

Each OC output (OC1, OC2) is an open-drain, active-low signal that pulls low during overcurrent or thermal fault on its associated channel. It remains low until the fault condition is removed and the device recovers - either automatically after cooling (thermal hysteresis ~20°C) or upon current reduction below the trip threshold (~0.5 A short-circuit limit). The OC signal requires an external pull-up resistor (typically 10 kΩ to V_CC) to generate a valid logic-high when inactive. This behavior is documented in the DETAILED DESCRIPTION (page 7) and ELECTRICAL CHARACTERISTICS (page 11).

Can TPS2046ADR operate from a 3.3 V supply?

Yes, TPS2046ADR fully supports 3.3 V operation: its input voltage range is 2.7 V to 5.5 V (page 9), and R_DS(on) is characterized at 3.3 V (125 mΩ typ at 25°C). The internal charge pump ensures proper gate drive even at minimum input, and enable inputs remain TTL/CMOS-compatible. Rise time increases slightly at 3.3 V (3 ms typ vs. 2.5 ms at 5.5 V), but remains within specification. No external components are required to use TPS2046ADR with 3.3 V rails.