Texas Instruments TPS2021DG4

Overview

TPS2021DG4 from Texas Instruments is a 50-mΩ N-channel MOSFET high-side power distribution switch with 0.9-A current-limit threshold, 2.7–5.5 V input range, and integrated thermal/overcurrent protection. It features logic-level enable (active-low), open-drain OC output, and controlled 6.1-ms rise time-designed for hot-plug USB peripherals, portable docking stations, and USB-powered hubs where inrush current and short-circuit resilience are critical.

For engineers reviewing the TPS2021DG4 datasheet, TPS2021DG4 pinout, TPS2021DG4 application, or TPS2021DG4 equivalent, this page delivers verified electrical parameters, SOIC-8 package mapping, functional pin roles, real-world use cases in hot-swap systems, and two validated alternative parts with documented technical and application differences.

Technical Context

The TPS2021DG4 implements an internal charge pump to drive the N-channel MOSFET gate above source potential, enabling full enhancement down to 2.7 V input without external components. Its current-limit circuit uses a sense FET-not a shunt resistor-to maintain low conduction loss while delivering precise 0.9-A (typ) short-circuit current at 25°C.

Thermal shutdown activates at ~140°C junction temperature with ~20°C hysteresis, and undervoltage lockout disables the switch below ~2 V input. The OC pin asserts low during overcurrent or overtemperature events and remains latched until fault removal-enabling system-level fault monitoring and recovery sequencing.

Key Specifications

Pinout & Package

TPS2021DG4 is housed in an 8-pin SOIC (D) package with standard JEDEC MS-012AC footprint (5.3 mm × 6.2 mm, 1.75 mm height). Pin 1 is GND; pins 2 and 3 are parallel IN inputs; pin 4 is active-low EN; pin 5 is open-drain OC; pins 6, 7, and 8 are paralleled OUT terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2021DG4, TPS2021DR offers identical performance in tape-and-reel format for manufacturing scalability, while TPS2051BDBVR trades fault visibility and current precision for lower cost and smaller footprint-making it suitable only where system-level diagnostics are omitted.

Availability

TPS2021DG4 is available at Aetrix Electronics and suitable for USB peripheral power management, hot-swap module protection, and portable docking station designs requiring stable component supply, long-term lifecycle support, and guaranteed authenticity.

Supply support for TPS2021DG4 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 and embedded processing technologies, with decades of expertise in power management ICs for industrial, automotive, and computing markets.

The TPS202x family-including TPS2021DG4-is engineered specifically for robust hot-plug power distribution in systems exposed to heavy capacitive loads and frequent short-circuit events, emphasizing safety, reliability, and ease of integration.

FAQ

What is the exact current-limit threshold of the TPS2021DG4?

The TPS2021DG4 has a typical short-circuit current limit of 0.9 A at 25°C and 5.5 V input, with a minimum of 0.66 A and maximum of 1.1 A across temperature and voltage. This value is factory-trimmed and applies to both steady-state overload and short-circuit conditions-triggering constant-current mode rather than immediate shutdown.

Does the TPS2021DG4 require external components for basic operation?

No, the TPS2021DG4 operates autonomously with only two recommended external components: a 0.1-μF ceramic bypass capacitor between IN and GND (close to the device), and optionally an RC filter on the OC pin to suppress false triggers during hot-plug inrush. The internal charge pump eliminates need for external boost circuitry.

Can the TPS2021DG4 be used with 3.3-V logic control signals?

Yes, the TPS2021DG4 EN input is compatible with both 3.3-V and 5-V logic families. A logic-low voltage ≤0.5 V (at 2.7–4.5 V input) reliably enables the switch, and logic-high ≥2 V disables it-ensuring interoperability with modern microcontrollers and FPGAs operating at 3.3 V I/O levels.

How does the OC pin behave during thermal shutdown?

During thermal shutdown, the TPS2021DG4 asserts its OC pin low-identical to overcurrent behavior. The OC output remains low until junction temperature falls ~20°C below trip point (~120°C), at which point the switch auto-restarts and OC deasserts if no concurrent overcurrent condition exists.

Is the TPS2021DG4 pin-compatible with other TPS202x variants like TPS2022DG4?

Yes, all TPS202x devices-including TPS2021DG4, TPS2022DG4, and TPS2023DG4-share identical SOIC-8 pinout and package dimensions. Only the current-limit threshold differs; no PCB redesign is needed when upgrading or downgrading within the family for different load requirements.