Texas Instruments TPS2047D

Overview

TPS2047D from Texas Instruments is a triple-channel, current-limited, high-side power-distribution switch IC with 135-mΩ (5 V) on-resistance per channel, 250 mA continuous output current per channel, active-low enable logic, and independent overcurrent/thermal protection with open-drain OCx outputs. It operates from 2.7 V to 5.5 V and is used in USB peripheral power management, hot-plug insertion circuits, and multi-rail PC peripheral distribution.

For engineers reviewing the TPS2047D datasheet, TPS2047D pinout, TPS2047D application, or TPS2047D equivalent, key selection considerations include its active-low enable configuration, SOIC-16 package, 0.44-A short-circuit current limit at 25°C, thermal fault isolation capability, and compatibility with 3-V/5-V logic interfaces in bus-powered hub designs.

Technical Context

The TPS2047D integrates three independent N-channel MOSFET high-side switches with internal charge-pump gate drive enabling operation down to 2.7 V input. Each channel features dedicated current-sense FETs for precise 0.44-A trip-level limiting and dual-threshold thermal shutdown (140°C primary, 160°C secondary) that isolates only the faulted channel while others remain operational.

Its enable inputs (EN1–EN3) are active-low, and overcurrent outputs (OC1–OC3) are open-drain, active-low signals synchronized to per-channel faults. Undervoltage lockout engages below ~2 V, and rise/fall times are controlled (2.5 ms typical rise, 4.4 ms typical fall at 5.5 V) to suppress inrush-induced EMI and false OC triggering.

Key Specifications

Pinout & Package

TPS2047D is housed in a 16-pin SOIC (D) package with exposed pad not present; lead finish is matte tin, RoHS-compliant. Pin 1 is GND1, pin 5 is GND2 - dual ground pins reduce ground bounce across channels.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2047D, TPS2057D offers identical protection and switching performance but inverted enable polarity - requiring firmware adaptation. TPS2067DR delivers superior thermal efficiency and 2× current capacity in a smaller package, yet mandates layout revision and requalification for high-reliability applications.

Availability

TPS2047D is available at Aetrix Electronics and suitable for USB peripheral power management, hot-plug insertion systems, and multi-rail embedded computing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2047D 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 innovation in power management ICs.

The TPS2047D belongs to TI's legacy power-distribution switch family designed specifically for USB-compliant hot-plug power control, emphasizing fault containment, low EMI, and robust thermal management in space-constrained computing peripherals.

FAQ

What is the enable logic polarity of the TPS2047D?

The TPS2047D uses active-low enable inputs: EN1, EN2, and EN3 must be driven low to turn on their respective power switches (IN1→OUT1, IN1→OUT2, IN2→OUT3). This differs from the pin-compatible TPS2057D, which uses active-high enables. The TPS2047D datasheet specifies VIH ≤ 0.8 V and VIL ≥ 2 V for logic recognition, ensuring compatibility with standard 3.3 V/5 V CMOS outputs.

Does the TPS2047D support bidirectional current flow?

No - the TPS2047D is a unidirectional high-side N-channel MOSFET switch. It blocks reverse current (from OUTx back to INx) when disabled and conducts only from INx to OUTx when enabled. The datasheet explicitly states "Configured as a high-side switch, the power switch prevents current flow from OUTx to INx and INx to OUTx when disabled", confirming strict forward-only operation.

How does thermal protection work on the TPS2047D?

The TPS2047D implements dual-threshold thermal shutdown: at ~140°C, only the faulted channel shuts off while others remain active; at ~160°C, all channels disable. After cooling by ~20°C, the affected channel automatically recovers. This behavior is confirmed in the "Thermal Sense" section of the datasheet and enables graceful degradation - critical in multi-port USB hubs where partial functionality must be preserved during localized overload.

Can the TPS2047D be used with 3.3-V input supplies?

Yes - the TPS2047D operates from 2.7 V to 5.5 V, and its internal charge pump ensures reliable gate drive even at 3.3 V. At 3.3 V input and 25°C, R_DS(on) is 105 mΩ max (vs. 135 mΩ at 5 V), resulting in lower conduction loss. The enable inputs accept 3.3 V logic levels directly, and OCx outputs remain functional with 3.3 V pull-ups, making it fully compatible with mixed-voltage 3.3 V/5 V systems.

What is the purpose of the dual ground pins (GND1 and GND2) on the TPS2047D?

GND1 (Pin 1) serves as the return path exclusively for Channel 1 (IN1→OUT1), while GND2 (Pin 5) handles return currents for Channels 2 and 3 (IN1→OUT2 and IN2→OUT3). This separation minimizes ground-bounce coupling between channels and improves noise immunity in multi-load systems - a design choice validated in TI's application note SLVA272 and reflected in the functional block diagram showing independent ground references per switch driver stage.