Texas Instruments TPS2056P

Overview

TPS2056P from Texas Instruments is a dual-channel, active-high enable, current-limited high-side power-distribution switch featuring two 135-mΩ N-channel MOSFETs, 250 mA continuous per channel, 0.44 A short-circuit current limit, and operation from 2.7 V to 5.5 V - designed for USB peripheral power control in hot-plug applications such as keyboards, scanners, and bus-powered hubs.

For engineers reviewing the TPS2056P datasheet, TPS2056P pinout, TPS2056P application, or TPS2056P equivalent, key selection criteria include enable polarity (active-high), thermal shutdown behavior at ~140°C, open-drain overcurrent flag outputs (OC1/OC2), and SOIC/PDIP package compatibility with legacy USB power management designs.

Technical Context

The TPS2056P integrates dual independent high-side switches with internal charge-pump gate drive enabling full operation down to 2.7 V input while maintaining controlled 2.5-ms typical rise time and 4.4-ms fall time. Each channel features dedicated overcurrent sensing via sense-FET architecture and independent thermal trip circuitry with dual-threshold protection (140°C primary, 160°C secondary).

Its logic-level enable inputs are TTL/CMOS-compatible, and undervoltage lockout (UVLO) disables switching below ~2 V to prevent erratic behavior during power ramp-up. The device implements bidirectional current limiting - sustaining constant output current under overload while reducing output voltage - and supports automatic thermal recovery with ~20°C hysteresis.

Key Specifications

Pinout & Package

TPS2056P is supplied in an 8-pin plastic dual-in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is matte tin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2046P and TPD3S014PWP, the TPS2056P uniquely delivers dual active-high enables with independent OC flags and thermal shutdown - making it the only option among the three that supports coordinated, logic-aligned power control and fault diagnostics across two USB downstream paths without external support circuitry.

Availability

TPS2056P is available at Aetrix Electronics and suitable for USB peripheral design, industrial interface modules, and embedded hot-plug power management requiring stable component supply, long-term lifecycle support, and through-hole manufacturability.

Supply support for TPS2056P 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 industrial, automotive, and communications markets.

The TPS20xx family was engineered specifically for USB-compliant power distribution - emphasizing controlled inrush, fault isolation, and compatibility with legacy 5-V and emerging 3.3-V system rails in desktop, portable, and peripheral equipment.

FAQ

What is the enable polarity of the TPS2056P?

The TPS2056P features active-high enable inputs: EN1 and EN2 must be driven high (≥2 V) to turn on their respective output channels (OUT1 and OUT2). This differs from the TPS2046P, which uses active-low enables. The TPS2056P's logic alignment simplifies direct interfacing with most microcontrollers and USB host controllers that assert high-enable signals after enumeration.

Does the TPS2056P provide overcurrent fault indication?

Yes, the TPS2056P provides two open-drain overcurrent flag outputs - OC1 and OC2 - that go low during overcurrent or overtemperature conditions on their respective channels. These outputs can be externally pulled up to any logic-compatible voltage (e.g., 3.3 V or 5 V) and wired together for shared interrupt signaling. The TPS2056P does not auto-retry after fault clearance; the enable signal must be cycled to restore output.

What is the maximum continuous output current per channel for the TPS2056P?

The TPS2056P supports 250 mA continuous output current per channel under recommended operating conditions (T_A ≤ 85°C, adequate PCB copper, no sustained short). This rating assumes use of the PDIP package with its 106°C/W junction-to-ambient thermal resistance. At higher ambient temperatures or with heavier loads, thermal limiting may engage before reaching 250 mA - always verify junction temperature using P_D = I² × r_DS(on) and T_J = P_D × R_θJA + T_A.

Can the TPS2056P operate from a 3.3-V supply?

Yes, the TPS2056P operates from 2.7 V to 5.5 V, fully supporting 3.3-V input rails. At 3.3 V, its typical r_DS(on) increases to 105 mΩ (25°C), resulting in ~26 mV dropout at 250 mA. The internal charge pump ensures reliable gate drive even at minimum input, and enable thresholds remain valid (VIH ≥ 2 V, VIL ≤ 0.4 V at 2.7–4.5 V). This makes the TPS2056P suitable for mixed-voltage USB systems and low-power embedded designs.

How does thermal protection work on the TPS2056P?

The TPS2056P implements dual-threshold thermal protection: at ~140°C, only the overloaded channel shuts off while the other remains operational; if die temperature reaches ~160°C, both channels disable. After shutdown, automatic recovery occurs once junction temperature falls ~20°C below trip point. This staged response preserves system functionality during transient overloads and prevents cascading failures - a critical feature for multi-port USB hubs and industrial interfaces where single-point faults must be contained.