NXP Semiconductors NX5P2553GUZ

Overview

NX5P2553GUZ from NXP Semiconductors is a precision adjustable current-limited power switch featuring an N-channel MOSFET, programmable overcurrent threshold (85 mA–1.8 A), 95 mΩ typical R_ON, and integrated protections including UVLO (2.35 V), overtemperature shutdown (155 °C), reverse-voltage protection (140 mV trip), and fast short-circuit response (2.0 µs). It operates from 2.5 V to 5.5 V and is used in USB port/hub power management.

For engineers reviewing the NX5P2553GUZ datasheet, NX5P2553GUZ pinout, NX5P2553GUZ application, or NX5P2553GUZ equivalent, key selection considerations include adjustable current limit via ILIM resistor, open-drain FAULT signaling, built-in soft-start for inrush control, logic-level EN with integrated translation, and thermal-enhanced HXSON6 package suitability for space-constrained USB and set-top box designs.

Technical Context

The NX5P2553GUZ implements a single N-channel MOSFET power switch with analog current-sense feedback and deglitched protection comparators. Its OCP circuit uses external resistor programming of I_OCP with ±6% accuracy at 1.8 A, while UVLO and OTP operate independently of EN state. Reverse-voltage protection activates when V_OUT exceeds V_VIN by ≥140 mV for ≥4 ms.

Protection responses are prioritized: short-circuit (ISW > 4×I_OCP) triggers immediate turn-off; overcurrent (ISW > I_OCP) enters constant-current mode before FAULT assertion after 8.7 ms deglitch; RVP disables the switch until reverse condition clears for ≥2 ms. The FAULT pin is open-drain with internal high-impedance recovery upon fault removal.

Key Specifications

Pinout & Package

Package: HXSON6 (SOT1189-1), plastic thermal-enhanced extremely thin small outline package; no leads; 6 terminals; body size 1.6 mm × 1.6 mm × 0.5 mm. Exposed thermal pad connected to GND for improved heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDBVR and NCP45520MUTBG, the NX5P2553GUZ uniquely combines programmable current limiting, reverse-voltage protection, and integrated UVLO in a 1.6 mm × 1.6 mm HXSON6 package-making it optimal for compact, standards-compliant USB and consumer electronics power distribution where fault coverage and layout simplicity are critical.

Availability

NX5P2553GUZ is available at Aetrix Electronics and suitable for USB port/hubs, digital TV and set-top boxes, and VoIP phones requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for NX5P2553GUZ 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

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The NX5P2553GUZ belongs to NXP's precision power switch product line, designed specifically for USB-compliant, space-constrained power distribution with comprehensive fault protection and programmable current limiting.

FAQ

What is the minimum and maximum current limit range supported by the NX5P2553GUZ?

The NX5P2553GUZ supports an adjustable overcurrent protection threshold from 85 mA to 1.8 A, set using an external resistor between the ILIM pin and GND. Resistor values from 15 kΩ to 232 kΩ yield this full range, with ±6% accuracy at 1.8 A. At extremes-e.g., ILIM shorted to VIN-the device defaults to ~85 mA, while 210 kΩ yields ~140 mA.

How does the NX5P2553GUZ handle reverse-voltage conditions?

The NX5P2553GUZ detects reverse voltage when V_OUT exceeds V_VIN by ≥140 mV for ≥4 ms, then disables the internal N-channel MOSFET. Once the condition clears for ≥2 ms, the switch automatically re-enables. This protects upstream sources in hot-swap or dual-power configurations without external diodes-unlike many competing switches that lack this feature.

What is the purpose of the FAULT pin on the NX5P2553GUZ, and how should it be interfaced?

The FAULT pin on the NX5P2553GUZ is an open-drain output that asserts LOW (after 5–12 ms deglitch) when any protection circuit activates-OCP, OTP, UVLO, or RVP. It requires an external pull-up resistor (typically 10 kΩ) to the host controller's logic rail. The pin returns to high-impedance automatically upon fault clearance, enabling direct interrupt or polling without software reset.

Does the NX5P2553GUZ require external components for basic operation?

Yes-the NX5P2553GUZ requires at minimum: (1) a 0.1 µF ceramic capacitor between VIN and GND, placed adjacent to the pin; (2) a pull-up resistor on FAULT; and (3) an external resistor between ILIM and GND to set the current limit. Optional but recommended: 10 µF bulk capacitance at VIN/VOUT and Kelvin-ground routing per datasheet layout guidelines to ensure stability under transient loads.

What thermal performance can be expected from the NX5P2553GUZ in its HXSON6 (SOT1189-1) package?

In the HXSON6 package (SOT1189-1), the NX5P2553GUZ has a typical junction-to-ambient thermal resistance (R_th(j-a)) of 105 K/W on a two-layer PCB with proper copper pour. With its 95 mΩ R_ON, it delivers 1.5 A continuously up to +105 °C junction temperature. The exposed thermal pad must be soldered to a solid GND plane to achieve rated performance-failure to do so risks thermal shutdown under sustained load.