Texas Instruments TPS2066DGN-1

Overview

TPS2066DGN-1 from Texas Instruments is a dual-channel, current-limited, high-side power-distribution switch featuring two 70 mΩ N-channel MOSFETs, 1 A continuous output current per channel, thermal and short-circuit protection, and accurate current limiting (1.1 A min / 1.9 A max). It operates from 2.7 V to 5.5 V and is used in USB-powered peripherals, portable instrumentation, and embedded systems requiring controlled hot-swap capability.

For engineers reviewing the TPS2066DGN-1 datasheet, TPS2066DGN-1 pinout, TPS2066DGN-1 application, or TPS2066DGN-1 equivalent, key selection considerations include dual-channel independent enable control, flat current-limit behavior (no overcurrent trip threshold), 0.6 ms typical rise time, undervoltage lockout at 2.0–2.6 V, and active-low open-drain OC1/OC2 fault reporting with 4–15 ms deglitch.

Technical Context

The TPS2066DGN-1 integrates two independent high-side N-channel MOSFET switches with internal charge-pump gate drive enabling operation down to 2.7 V input. Each channel features dedicated EN1/EN2 logic inputs (active-high) and OC1/OC2 open-drain fault outputs.

Unlike TPS2062-1/TPS2065-1, the TPS2066DGN-1 implements flat current limiting-no separate IOC threshold-relying solely on IOS (1.1–1.9 A) for overload response. Its discharge function provides ~100 Ω resistive path when disabled, supporting safe de-energization of capacitive loads without external circuitry.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package: 3 mm × 3 mm, 0.65 mm pitch, exposed thermal pad for enhanced heat dissipation. Pin 1 = GND; pins 2 & 3 = IN; pins 6 & 7 = OUT1 & OUT2; pin 8 = EN2; pin 3 = EN1; pins 5 & 8 = OC2 & OC1 (shared pin assignment per datasheet top-view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2062DGN-1, the TPS2066DGN-1 offers simpler flat current limiting and active-high enable logic, while TPS2065DGN-1 reduces footprint and BOM count for single-rail use-both alternatives retain identical thermal performance, discharge function, and 70 mΩ rDS(on) but differ in channel count and control interface.

Availability

TPS2066DGN-1 is available at Aetrix Electronics and suitable for USB peripheral design, industrial I/O protection, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2066DGN-1 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 over 50 years of innovation in high-reliability IC design.

The TPS206x-1 family was designed specifically for robust, current-limited power distribution in space-constrained systems-emphasizing fault resilience, low quiescent current, and seamless integration with microcontroller-based monitoring and control.

FAQ

What is the current-limiting behavior of the TPS2066DGN-1 compared to other TPS206x-1 variants?

The TPS2066DGN-1 implements flat current limiting-meaning it transitions directly into constant-current mode at the short-circuit output current (IOS) threshold of 1.1–1.9 A, with no separate overcurrent trip threshold (IOC). This differs from TPS2062DGN-1, which uses peaking-type limiting with distinct IOC and IOS points. The flat profile simplifies fault-response timing and eliminates ambiguity in current-limit onset, making TPS2066DGN-1 ideal for applications requiring deterministic current clamping without early-warning stages.

Does the TPS2066DGN-1 support independent enable control for each channel?

Yes, the TPS2066DGN-1 provides fully independent enable inputs: EN1 (Pin 3) controls Channel 1 and EN2 (Pin 4) controls Channel 2, both active-high. This allows asynchronous power-up/down sequencing-for example, enabling OUT1 for sensor biasing while keeping OUT2 disabled for actuator control until a safety check passes. Each channel also has its own OC1 (Pin 8) and OC2 (Pin 5) fault outputs, enabling granular diagnostics without cross-channel interference.

How does the discharge function operate in the TPS2066DGN-1, and what load capacitance can it handle?

The TPS2066DGN-1 activates an internal ~100 Ω discharge path between OUT1/OUT2 and GND when either channel is disabled (ENx low) or during UVLO conditions. This safely dissipates stored charge in output filter capacitors-typically up to 100 µF-with discharge times under 10 ms for common values (e.g., 10 µF discharges in ~1 ms). It is not intended for steady-state loads: maximum discharge current is 8 mA, so sustained capacitive loads >100 µF require supplemental external discharge circuitry.

What thermal performance can be expected from the TPS2066DGN-1 in a standard PCB layout?

In a standard 2-layer PCB with 1-in² 2-oz copper pour connected to the DGN package's exposed thermal pad, the TPS2066DGN-1 achieves RθJA ≈ 53.6°C/W. At 1 A per channel and 5 V input, total power dissipation is ~140 mW (2 × 70 mΩ × 1² A), resulting in ~7.5°C junction-to-ambient rise-well within the –40°C to 125°C operating range. Derating is recommended above 85°C ambient; thermal shutdown triggers at 135°C junction with 10°C hysteresis for automatic recovery.

Is the TPS2066DGN-1 compatible with 3.3 V logic-level microcontrollers?

Yes, the TPS2066DGN-1 EN1 and EN2 inputs are TTL/CMOS-compatible with VIH ≥ 2.0 V and VIL ≤ 0.8 V across the full 2.7–5.5 V input range. A 3.3 V MCU GPIO can directly drive both enables high (≥2.0 V) to activate channels and low (≤0.8 V) to disable them-no level-shifting required. Similarly, OC1 and OC2 are open-drain outputs compatible with 3.3 V pull-up resistors (e.g., 10 kΩ), allowing direct interfacing to 3.3 V interrupt inputs.