Texas Instruments TPS2555DRCT

Overview

TPS2555DRCT from Texas Instruments is a precision adjustable current-limited power-distribution switch featuring a 73-mΩ high-side N-channel MOSFET, dual programmable current-limit thresholds (500 mA to 2.5 A), and low-enable logic control. It delivers fast overcurrent response (1.5 µs typ), automatic output discharge, and thermal shutdown protection for USB-compliant ports and digital TV power rails.

For engineers reviewing the TPS2555DRCT datasheet, TPS2555DRCT pinout, TPS2555DRCT application, or TPS2555DRCT equivalent, this device supports precise current limiting in high-capacitance load scenarios, enables dynamic current threshold selection via ILIM_SEL, and integrates PowerPAD™ thermal management for sustained operation under overload conditions.

Technical Context

The TPS2555DRCT implements an internal charge pump to drive the gate of its integrated N-channel MOSFET, enabling full enhancement above the source voltage. Its dual current-limit architecture uses two external resistors (ILIM0/ILIM1) selected by a logic-level ILIM_SEL input, allowing runtime switching between thresholds - e.g., battery vs. adapter modes.

Overcurrent detection triggers constant-current regulation with deglitched FAULT assertion (9 ms typical), while undervoltage lockout (4.1 V nominal turn-on, 100 mV hysteresis) prevents erratic startup. Thermal protection includes dual sensors: one active during current limit (135°C min shutdown), another ambient-triggered (155°C min), both with ~20°C hysteresis and auto-restart capability.

Key Specifications

Pinout & Package

VSON-10 (DRC) package with exposed PowerPAD™ thermal pad; 3 mm × 3 mm footprint, 0.5 mm pitch, 0.8 mm height. PowerPAD™ must be soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2554DRCT, TPS2555DRCT offers native low-enable compatibility with common open-drain drivers and simplifies level-shifting in 3.3 V MCU systems; versus TPS259211DRCR, it trades advanced protection features for lower BOM count and direct USB-5V optimization.

Availability

TPS2555DRCT is available at Aetrix Electronics and suitable for USB port protection, digital TV power rail switching, and VoIP phone power management requiring stable component supply across production lifecycles.

Supply support for TPS2555DRCT 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 decades of expertise in power management ICs.

The TPS255x family was designed specifically for USB-compliant, current-limited power distribution in space-constrained consumer and computing equipment, emphasizing precision threshold control, thermal resilience, and ease of layout.

FAQ

What is the enable logic polarity of the TPS2555DRCT?

The TPS2555DRCT uses active-low enable logic: the internal power switch turns ON when the EN pin is pulled to GND (≤0.9 V), and turns OFF when EN is at VIN or floating (≥1.65 V). This simplifies interface with open-drain microcontroller outputs or push-button reset circuits without level-shifting components. The TPS2555DRCT datasheet specifies EN threshold hysteresis of 200 mV to prevent chatter near the switching point.

How do I set the current-limit threshold for the TPS2555DRCT?

The TPS2555DRCT supports two independent current-limit thresholds set by external resistors: RILIM0 on pin 7 sets the low threshold (e.g., 500 mA), and RILIM1 on pin 6 sets the high threshold (e.g., 2.5 A). The ILIM_SEL pin (pin 4) selects between them - logic LO chooses RILIM0, logic HI chooses RILIM1. Resistor values between 16.9 kΩ and 750 kΩ are recommended, with best accuracy below 210 kΩ per the TPS2555DRCT Electrical Characteristics table.

Does the TPS2555DRCT provide reverse-current blocking?

No, the TPS2555DRCT does not include reverse-current blocking. It is a unidirectional high-side switch that conducts from IN to OUT only. If reverse current flow (e.g., from OUT back to IN during input dropout) must be prevented, an external Schottky diode or a different device such as the TPS259211DRCR - which integrates true reverse-current blocking - is required. This limitation is explicitly stated in the TPS2555DRCT functional description and absolute maximum ratings.

What thermal performance can I expect from the TPS2555DRCT in a standard PCB layout?

In a JEDEC-standard high-K board layout with PowerPAD™ soldered to a 4-layer board's internal ground plane using ≥4 thermal vias, the TPS2555DRCT achieves θ_JA = 45.9°C/W and θ_JCbot = 5.9°C/W. At 2 A output current and 73 mΩ R_DS(on), power dissipation is ~292 mW, resulting in ~13.4°C rise above ambient - well within the –40°C to 125°C operating range. Actual performance depends on copper area, airflow, and adjacent heat sources, as detailed in the TPS2555DRCT thermal metrics section.

Can the TPS2555DRCT be used outside the 4.5 V to 5.5 V input range?

No - the TPS2555DRCT is specified and characterized only for 4.5 V to 5.5 V input operation. Its undervoltage lockout activates below 3.9 V (min), and absolute maximum rating for IN is 7 V. Operation below 4.5 V may cause unreliable current limiting or enable functionality; operation above 5.5 V risks exceeding safe operating area and violates recommended conditions. For wider input ranges, consider TI's TPS2592xx or TPS2594xx families, which are not functionally equivalent to the TPS2555DRCT.