Texas Instruments TPS2068D

Overview

TPS2068D from Texas Instruments is a single-channel, current-limited, high-side power-distribution switch featuring a 70-mΩ N-channel MOSFET, 1.5-A continuous output current, 2.7 V to 5.5 V input voltage range, and active-high enable logic. It delivers controlled power sequencing for USB host ports and hot-plug peripheral modules.

For engineers reviewing the TPS2068D datasheet, TPS2068D pinout, TPS2068D application, or TPS2068D equivalent, key selection criteria include thermal shutdown threshold (135°C), deglitched overcurrent reporting (4–15 ms), reverse current blocking, undervoltage lockout (2.0–2.5 V), and D-package compatibility with 0°C to 70°C industrial operation.

Technical Context

The TPS2068D integrates an internal charge pump to drive the high-side N-channel MOSFET gate, enabling full enhancement down to 2.7 V input without external components. Its current-limit circuit operates in constant-current mode during overload, with trip threshold tightly specified at 1.6 A (min) to 2.6 A (max) at 5 V.

Thermal protection activates at 135°C junction temperature and recovers automatically at 125°C, while the open-drain OC output provides deglitched fault signaling. The device includes reverse current blocking and UVLO with 75 mV hysteresis to ensure clean power-up behavior in hot-swap systems.

Key Specifications

Pinout & Package

D-package (SOIC-8) with exposed PowerPad thermally connected to GND. Pin 1 = GND, Pin 2 = IN, Pin 3 = IN, Pin 4 = EN, Pin 5 = OC, Pin 6 = OUT, Pin 7 = OUT, Pin 8 = OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2068D, TPS2068DRB offers superior thermal dissipation in smaller area, while TPS2069DGN maintains pin compatibility but demands logic inversion - neither is drop-in; both require layout or firmware validation.

Availability

TPS2068D is available at Aetrix Electronics and suitable for USB host port protection, hot-plug module power control, and industrial peripheral switching requiring stable component supply across industrial temperature ranges.

Supply support for TPS2068D 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 connectivity technologies with over 50 years of power management innovation.

The TPS206x family was designed specifically for USB-compliant power distribution and hot-swap applications, emphasizing robust fault protection, precise current limiting, and seamless integration into host/hub architectures.

FAQ

What is the maximum continuous output current rating for the TPS2068D?

The TPS2068D supports 1.5 A continuous output current under recommended operating conditions (TA ≤ 70°C, VI(IN) = 2.7 V to 5.5 V). This rating assumes proper PCB thermal design with GND-connected PowerPad. At elevated temperatures or higher rDS(on), derating applies per the Dissipation Rating Table - e.g., 322 mW at TA = 70°C for the D-package.

Does the TPS2068D provide reverse current blocking?

Yes, the TPS2068D includes integrated reverse current blocking. When the device is disabled (EN low) and voltage is applied to the OUT pins, current flow from OUT to IN is blocked - measured leakage is ≤0.2 µA at 5.5 V. This feature prevents backfeeding in multi-supply systems and is confirmed in the Electrical Characteristics table under "Reverse leakage current".

What is the purpose of the deglitched OC output on the TPS2068D?

The OC pin on the TPS2068D is an open-drain output that asserts low after a 4–15 ms deglitch timeout when overcurrent or thermal shutdown occurs. This filtering prevents false triggering during normal inrush events (e.g., charging 100 µF loads), ensuring reliable fault reporting to host controllers without software debouncing overhead.

Can the TPS2068D operate from a 3.3-V supply rail?

Yes, the TPS2068D operates across 2.7 V to 5.5 V, including 3.3 V. At 3.3 V input, rDS(on) increases to 115 mΩ (typ), resulting in ~260 mW conduction loss at 1.5 A. Rise time extends to ~1.0 ms, and current-limit accuracy remains within 1.6–2.6 A. All specifications in the Electrical Characteristics table are validated at 3.3 V and 2.7 V.

How does the TPS2068D handle thermal overload conditions?

When power dissipation raises junction temperature to 135°C, the TPS2068D triggers thermal shutdown and disables the output. Recovery begins automatically once TJ falls to 125°C (10°C hysteresis). During cycling, the OC pin remains asserted low until the fault clears - verified in the Thermal Shutdown section of the datasheet with test conditions and timing values.