Texas Instruments TPS2057AD

Overview

TPS2057AD from Texas Instruments is a triple-channel, high-side current-limited power-distribution switch with independent enable control per channel, 80-mΩ on-resistance at 5 V, 250 mA continuous output current per switch, and active-high CMOS/TTL-compatible enable inputs. It protects USB-powered peripherals, hot-swap modules, and multi-rail embedded systems against short circuits and inrush currents.

For engineers reviewing the TPS2057AD datasheet, TPS2057AD pinout, TPS2057AD application, or TPS2057AD equivalent, key selection criteria include per-channel thermal/overcurrent fault reporting via open-drain OC outputs, 2.7-V to 5.5-V input operation, <10 µA standby supply current (per channel disabled), and SOIC-16 package compatibility for space-constrained PCB layouts.

Technical Context

The TPS2057AD integrates three independent N-channel MOSFET high-side switches, each driven by an internal charge pump enabling full enhancement down to 2.7 V input. Each channel features dedicated overcurrent sensing via sense-FET architecture and dual-threshold thermal shutdown (trip at ~140°C, hysteresis ~20°C) that isolates only the faulted channel.

It implements undervoltage lockout (~2 V threshold), 2.5-ms typical output rise time, and independent logic-level enable inputs (EN1–EN3) with 0.4 V low-level and 2 V high-level voltage thresholds. The OC1–OC3 open-drain outputs assert low during overcurrent or thermal events and remain latched until fault removal.

Key Specifications

Pinout & Package

TPS2057AD is housed in a 16-pin SOIC (D) package with 1.27-mm pitch, surface-mount footprint, and thermal pad not present. Pin assignments are validated per TI SLVS251C datasheet Figure "TPS2047A AND TPS2057A" top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2047AD and TPS2056AD, the TPS2057AD uniquely delivers three active-high-enable channels with dual-input capability (IN1 for two outputs, IN2 for third), making it optimal for compact multi-load systems requiring coordinated yet independent power control and fault reporting.

Availability

TPS2057AD is available at Aetrix Electronics and suitable for USB peripheral distribution, hot-swap board insertion, and multi-rail embedded system supply requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2057AD 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 specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and communications portfolio coverage.

The TPS205xA family was designed specifically for robust, current-limited power distribution in USB-compliant and hot-plug applications - emphasizing per-channel fault isolation, low quiescent current, and wide input voltage operation.

FAQ

What is the maximum continuous output current per channel of the TPS2057AD?

The TPS2057AD supports 250 mA continuous output current per channel across its full operating temperature range (0°C to 85°C ambient). This rating is maintained with proper PCB copper pour and airflow; derating applies above 70°C ambient per the dissipation rating table. The device enters constant-current limiting if load exceeds this value, preventing damage while sustaining operation.

Does the TPS2057AD support independent input rails for each channel?

The TPS2057AD supports two independent input rails: IN1 powers Channels A and B (OUT1 and OUT2), while IN2 powers Channel C (OUT3). GNDA and GNDB provide separate ground references to minimize coupling. This architecture enables true dual-supply distribution - for example, powering 3.3-V sensors from IN1 and 5-V actuators from IN2 - without cross-rail interference.

How does the overcurrent protection work on the TPS2057AD?

The TPS2057AD uses a sense-FET architecture to monitor load current per channel. When current exceeds the trip threshold (~0.5 A short-circuit limit, ~250 mA continuous), it enters constant-current mode and asserts the corresponding OCx pin low. OCx remains low until the overload is removed. Thermal shutdown (at ~140°C) provides secondary protection and isolates only the affected channel, preserving functionality of the other two.

What is the purpose of the NC pins on the TPS2057AD SOIC-16 package?

Pins 8, 9, and 10 on the TPS2057AD are designated NC (No Connect) - they are not bonded internally and serve no electrical function. TI's datasheet specifies these pins must be left unconnected (floating) or tied to GNDA/GNDB per PCB layout best practices to avoid parasitic coupling. They are not intended for thermal relief or mechanical anchoring.

Can the TPS2057AD operate from a 3.3-V supply?

Yes, the TPS2057AD operates from 2.7 V to 5.5 V, including standard 3.3-V rails. At 3.3 V input, the typical rDS(on) is 125 mΩ at 25°C (160 mΩ at 125°C), resulting in ≤83 mV dropout at 250 mA. The internal charge pump ensures reliable gate drive down to minimum input, and enable thresholds (VIH = 2 V min) remain fully compatible with 3.3-V logic systems.