Texas Instruments TPS2065CDGNR-2

Overview

TPS2065CDGNR-2 from Texas Instruments is a 1-A current-limited power-distribution switch in an 8-pin MSOP-PowerPAD package, featuring ±20% accurate fixed current limit, 2 µs overcurrent response, reverse current blocking, and no output discharge. It operates from 4.5 V to 5.5 V input and is designed for USB port protection in laptops and desktops where short-circuit and heavy capacitive load resilience are critical.

For engineers reviewing the TPS2065CDGNR-2 datasheet, TPS2065CDGNR-2 pinout, TPS2065CDGNR-2 application, or TPS2065CDGNR-2 equivalent, key selection considerations include its 1-A rated current limit, absence of output discharge (distinguishing it from TPS2065C), thermal shutdown at 135°C, deglitched fault reporting, and compatibility with TTL/CMOS enable logic.

Technical Context

The TPS2065CDGNR-2 integrates an N-channel MOSFET power switch with internal charge pump gate drive, enabling low R_DS(on) (86 mΩ typical at 25°C) while maintaining 5-V rail regulation under load. Its constant-current limiting architecture responds within 2 µs to short circuits, entering thermal cycling if overload persists beyond junction temperature threshold (135°C min).

Unlike the TPS2065C variant, the -2 suffix denotes omission of output discharge functionality - confirmed by absence of pulldown resistance (RPD) specification and block diagram differences. Fault reporting uses an active-low open-drain FLT pin with 6–12 ms deglitching, and undervoltage lockout engages below 3.5 V (typical) with 0.14 V hysteresis.

Key Specifications

Pinout & Package

TPS2065CDGNR-2 is housed in an 8-pin MSOP-PowerPAD (DGN) package measuring 3.00 mm × 3.00 mm, with the exposed PowerPAD thermally connected to GND for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2065CDGNR, the TPS2065CDGNR-2 eliminates output discharge to support clean power sequencing, while compared with TPS2061CDGNR, it delivers lower conduction loss and better thermal reliability in compact 8-pin MSOP-PowerPAD form factor.

Availability

TPS2065CDGNR-2 is available at Aetrix Electronics and suitable for USB port protection, laptop docking station power management, set-top box peripheral hubs, and high-definition TV service ports requiring stable component supply and long-term industrial availability.

Supply support for TPS2065CDGNR-2 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 TPS20xxC family was engineered specifically for USB-compliant power distribution, delivering robust short-circuit resilience, precise current limiting, and integrated protection features in compact packages for computing and consumer electronics.

FAQ

What is the key functional difference between TPS2065CDGNR-2 and TPS2065CDGNR?

The TPS2065CDGNR-2 lacks output discharge functionality, meaning it does not actively pull the OUT pin to GND when disabled. In contrast, TPS2065CDGNR includes a ~470 Ω pulldown resistor (RPD) on OUT. This distinction affects power sequencing behavior - TPS2065CDGNR-2 preserves external capacitor voltage for controlled ramp-down, while TPS2065CDGNR ensures rapid bus discharge. The TPS2065CDGNR-2 datasheet confirms no RPD specification and omits output discharge in its functional block diagram.

Does TPS2065CDGNR-2 support 5-V USB applications with heavy capacitive loads?

Yes, TPS2065CDGNR-2 is explicitly designed for USB applications encountering heavy capacitive loads and short circuits. Its built-in soft-start controls output rise time (~0.55 ms typical), limiting inrush current, while the 2 µs overcurrent response clamps fault current before upstream regulators collapse. The device maintains constant 1-A current under short conditions, with thermal cycling (135°C shutdown, 20°C hysteresis) providing fail-safe recovery - all validated in TI's USB port protection reference designs using TPS2065CDGNR-2.

What is the recommended layout practice for the PowerPAD on TPS2065CDGNR-2?

The exposed PowerPAD on TPS2065CDGNR-2 must be soldered to a dedicated PCB ground plane for optimal thermal performance. TI specifies a minimum 10 mm² copper area with ≥4 thermal vias (0.3 mm diameter) connecting to inner or bottom-layer ground planes. Leaving the PowerPAD floating is permitted but degrades thermal resistance (R_θJA increases from 67.1°C/W to 72.1°C/W), risking thermal shutdown under sustained 1-A load at elevated ambient temperatures.

Can TPS2065CDGNR-2 be used with 3.3-V logic enable signals?

Yes, TPS2065CDGNR-2 supports 3.3-V logic enable inputs. Its VIH (high-level input voltage) is specified at 2.0 V minimum, and VIL (low-level input voltage) at 0.7 V maximum - fully compatible with standard 3.3-V CMOS/TTL outputs. The enable pin draws only 1 µA leakage current when disabled, ensuring minimal loading on microcontroller GPIOs. No level-shifting circuitry is required for interfacing with 3.3-V host controllers.

How does the FLT pin behave during undervoltage lockout (UVLO) on TPS2065CDGNR-2?

During UVLO - triggered when VIN drops below 3.5 V (typical) - the FLT pin enters high-impedance (Hi-Z) state and ceases active-low assertion. This behavior is documented in the TPS2065CDGNR-2 functional description: FLT is only driven low during overcurrent or overtemperature faults when the device is powered and operational. When UVLO is active, internal circuits including the fault comparator are unpowered, resulting in FLT floating - requiring an external pullup resistor to maintain defined logic level for system monitoring.