Texas Instruments TPS2046P

Overview

TPS2046P from Texas Instruments is a dual-channel, current-limited, high-side N-channel MOSFET power-distribution switch designed for hot-plug and USB-compliant 5-V power rails. It delivers up to 250 mA per channel with 135-mΩ on-resistance at 5 V, independent thermal/overcurrent protection, and active-low enable logic - used in notebook USB ports, peripheral hubs, and embedded systems requiring fault-isolated power control.

For engineers reviewing the TPS2046P datasheet, TPS2046P pinout, TPS2046P application, or TPS2046P equivalent, key selection criteria include its 2.7–5.5-V input range, 0.44-A short-circuit current limit, 2.5-ms typical rise time, undervoltage lockout (2 V), and SOIC/PDIP package compatibility - all critical for robust hot-insertion and capacitive-load management.

Technical Context

The TPS2046P integrates two independent high-side power switches with internal charge-pump gate drive enabling operation down to 2.7 V while maintaining controlled 2.5-ms rise/fall times. Each channel features dedicated overcurrent detection via sense-FET architecture and open-drain OCx outputs that assert low during overload or thermal events.

Its dual-threshold thermal protection (trip at ~140°C, full shutdown at ~160°C) enables per-channel fault isolation without disrupting the second channel. The device implements undervoltage lockout (~2 V threshold) and supports bidirectional switching behavior only under specific load conditions - not as a design feature but as an inherent MOSFET characteristic.

Key Specifications

Pinout & Package

TPS2046P is housed in an 8-pin plastic dual-in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin spacing follows JEDEC MS-001 standard; thermal resistance θJA = 106°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2046D and TPS2056P, the TPS2046P offers through-hole manufacturability and native active-low enable compatibility with legacy USB hub controllers - making it optimal for industrial field-replaceable modules and evaluation platforms where layout flexibility and direct logic alignment matter most.

Availability

TPS2046P is available at Aetrix Electronics and suitable for USB peripheral hubs, notebook docking stations, and industrial hot-swap I/O modules requiring stable component supply across extended product lifecycles.

Supply support for TPS2046P 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 technologies with decades of automotive, industrial, and computing design expertise.

The TPS2046P belongs to TI's power-distribution switch family engineered specifically for USB-compliant hot-plug applications - emphasizing fault resilience, low EMI, and seamless integration with host controller GPIOs.

FAQ

What is the maximum continuous current per channel for the TPS2046P?

The TPS2046P supports 250 mA continuous output current per channel under recommended operating conditions (2.7–5.5 V input, –40°C to 85°C ambient). This rating assumes adequate PCB copper area and thermal management; derating applies above 70°C ambient per the dissipation rating table. Exceeding this current triggers constant-current limiting at ~0.44 A short-circuit threshold.

Does the TPS2046P support 3.3-V logic-level enable inputs?

Yes, the TPS2046P accepts 3.3-V logic signals on EN1 and EN2. Its enable-input thresholds are specified as VIH ≥ 2 V (high) and VIL ≤ 0.8 V (low) at 4.5–5.5 V input, and VIL ≤ 0.4 V at 2.7–4.5 V input - ensuring reliable recognition of standard 3.3-V CMOS/TTL logic levels without level shifting.

How does the TPS2046P handle short-circuit faults?

Upon detecting an overcurrent condition, the TPS2046P enters constant-current mode, limiting output to ~0.44 A while reducing output voltage. If the fault persists, junction temperature rises and thermal protection disables the affected channel at ~140°C. The OC1 or OC2 pin goes low, signaling the fault. Recovery is automatic once temperature drops ~20°C below trip point.

Can the TPS2046P be used in USB 2.0 applications?

Yes, the TPS2046P is widely deployed in USB 2.0 bus-powered hubs and downstream ports. Its 2.5-ms rise time meets USB inrush requirements, its 5-V operation matches the USB power specification, and its independent channel control supports multi-port enumeration sequences - all confirmed in TI's USB application notes and SLVS183 datasheet.

What is the purpose of the OC1 and OC2 pins on the TPS2046P?

The OC1 and OC2 pins are open-drain outputs that go low during overcurrent or overtemperature events on their respective channels. They require external pull-up resistors (typically 4.7–10 kΩ to 3.3/5 V) and provide real-time fault status to microcontrollers or USB host controllers - enabling software-driven port disable, logging, or user alert without polling.