Texas Instruments TPS2066AD

Overview

TPS2066AD from Texas Instruments is a dual-channel, current-limited, high-side power-distribution switch featuring two 70 mΩ N-channel MOSFETs, 1 A continuous per channel, 2.7 V to 5.5 V input operation, and integrated thermal/short-circuit protection - used in USB-powered peripherals and industrial I/O modules for safe hot-swap control.

For engineers reviewing the TPS2066AD datasheet, TPS2066AD pinout, TPS2066AD application, or TPS2066AD equivalent, key selection criteria include per-channel current limit accuracy (1.1 A min / 1.9 A max), output discharge function, deglitched OC reporting, undervoltage lockout threshold (2.0–2.6 V), and SOIC-8 package compatibility with board-level thermal management.

Technical Context

The TPS2066AD integrates two independent high-side N-channel MOSFET switches with internal charge-pump gate drive enabling full enhancement down to 2.7 V input. Each channel features dedicated enable (EN1/EN2) and overcurrent flag (OC1/OC2) pins, supporting asynchronous channel control and fault isolation.

Its flat current-limit architecture-distinct from peaking-limit variants like TPS2062-1-holds output current at IOS (1.1–1.9 A) without an intermediate trip threshold, simplifying overload response. Thermal shutdown activates at ~135°C with 10°C hysteresis, and the discharge function provides 100 Ω resistive path when disabled.

Key Specifications

Pinout & Package

TPS2066AD is housed in an 8-pin SOIC (D) package with exposed thermal pad (RθJA = 119.3°C/W), optimized for PCB heat spreading via GND-connected copper area under the device.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2066D and TPS2062DR, the TPS2066AD delivers guaranteed dual-channel operation across full industrial temperature range in a single SOIC-8 footprint-reducing design complexity, component count, and thermal derating overhead versus alternatives.

Availability

TPS2066AD is available at Aetrix Electronics and suitable for USB peripheral power management, industrial I/O protection, medical subsystems, and automotive body electronics requiring stable component supply and long-term manufacturability.

Supply support for TPS2066AD 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-switch architectures.

The TPS206x-1 family-including TPS2066AD-is designed specifically for robust, current-limited power distribution in space-constrained systems where hot-swap capability, fault visibility, and thermal resilience are critical.

FAQ

What is the maximum continuous current rating per channel for the TPS2066AD?

The TPS2066AD supports 1 A continuous current per channel under recommended operating conditions (2.7 V to 5.5 V input, ambient ≤85°C). This rating is sustained without thermal shutdown when PCB layout provides adequate copper area for heat dissipation, and rDS(on) remains ≤135 mΩ across temperature and voltage.

Does the TPS2066AD provide output discharge functionality, and how does it operate?

Yes, the TPS2066AD includes an internal discharge function activated when either EN1 or EN2 is deasserted. It provides a 100 Ω resistive path from OUT1 or OUT2 to GND, safely bleeding stored charge from output capacitors. This path handles ≤8 mA steady-state current and is intended for transient discharge-not continuous load sinking.

How does the overcurrent protection mechanism differ in the TPS2066AD compared to earlier TPS206x variants?

Unlike TPS2062-1 (which uses peaking current limit with separate IOC and IOS thresholds), the TPS2066AD implements flat current limiting: it transitions directly into constant-current mode at IOS (1.1–1.9 A) with no intermediate trip point. This eliminates delay between overload onset and current clamping, improving response predictability in short-circuit scenarios.

What is the purpose and timing behavior of the OC1 and OC2 outputs on the TPS2066AD?

OC1 and OC2 are active-low, open-drain fault indicators asserting during overcurrent or thermal shutdown. Each includes a hardware deglitch circuit with 4–15 ms timeout to suppress false triggers from inrush or noise. The signal remains low until the fault condition clears and the device recovers-no external reset is required.

Can the TPS2066AD operate reliably from a 3.3 V supply, and what impact does that have on performance?

Yes, the TPS2066AD operates fully across 2.7 V to 5.5 V. At 3.3 V input, rDS(on) increases slightly (typ. 75 mΩ vs 70 mΩ at 5 V), raising conduction loss by ~7%, and rise time extends modestly (0.4–1.0 ms vs 0.6–1.5 ms at 5.5 V). All protections-including UVLO, current limit, and thermal shutdown-remain fully functional.