NXP Semiconductors NX5P2090UKZ

Overview

NX5P2090UKZ from NXP Semiconductors is a logic-controlled high-side power switch designed for USB OTG applications, featuring integrated over-current, over-temperature, reverse-bias, under-voltage and over-voltage lockout protection. It delivers 2 A continuous switch current with 100 mΩ max ON resistance at 4.0 V supply, 30 V VBUS tolerance, and 1.8 V logic-compatible enable input. It isolates VINT voltage source from VBUS interface during fault conditions in portable battery-powered devices.

For engineers reviewing the NX5P2090UKZ datasheet, NX5P2090UKZ pinout, NX5P2090UKZ application, or NX5P2090UKZ equivalent, key selection considerations include its WLCSP9 package footprint, 3.0–5.5 V operating range, open-drain FAULT output signaling, analog VDET voltage monitor, and external RILIM-configurable current limit - all critical for USB3 OTG power domain isolation designs.

Technical Context

The NX5P2090UKZ implements a single N-channel MOSFET high-side switch with soft-start in-rush control and dual-stage current limiting (OCP + in-rush clamp). Its protection architecture operates autonomously: UVLO remains active in low-power mode (EN = LOW), while OVLO, OTP, RCP and OCP activate only when EN = HIGH and VINT is within 3.2–5.5 V.

Control logic includes 1.8 V–compatible EN input with internal level translation, ILIM pin supporting both resistor-set current threshold and GND-triggered 10 mA constant-current mode, and FAULT output that pulls low on any active protection event. VDET provides analog feedback of VBUS voltage (1.5–5.5 V) for host controller monitoring.

Key Specifications

Pinout & Package

Package: WLCSP9 - wafer-level chip-scale package, 1.36 × 1.36 × 0.51 mm body with backside coating, suitable for space-constrained mobile PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB2036IRHBR and TPS22965DSGR, the NX5P2090UKZ uniquely combines USB OTG–specific protections (reverse bias, 30 V tolerance, VDET monitoring) with WLCSP9 footprint and 1.8 V logic compatibility - making it irreplaceable for space-constrained, standards-compliant OTG implementations where autonomous fault response is mandatory.

Availability

NX5P2090UKZ is available at Aetrix Electronics and suitable for USB OTG host/peripheral designs, battery-powered USB hubs, and USB-C accessory power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for NX5P2090UKZ 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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The NX5P2090UKZ belongs to NXP's logic-controlled high-side power switch product line, engineered specifically for USB On-The-Go power domain isolation with autonomous fault protection and minimal board area requirements.

FAQ

What is the maximum continuous current rating for the NX5P2090UKZ?

The NX5P2090UKZ supports up to 2 A continuous switch current at ambient temperatures up to +85 °C, as specified in Table 6 of the datasheet. This rating assumes proper PCB thermal design with adequate copper pour on both top and bottom layers to maintain junction temperature below 125 °C. The actual achievable current may be lower under high ambient temperature or poor heat dissipation conditions.

Does the NX5P2090UKZ require an external pull-up resistor on the FAULT pin?

Yes, the FAULT pin on the NX5P2090UKZ is an open-drain output and requires an external pull-up resistor to a logic-compatible voltage (e.g., 1.8 V or 3.3 V) to generate a valid HIGH signal when no fault is present. The recommended pull-up resistance is 20–200 kΩ, as specified in Table 9, ensuring fast rise time while minimizing current draw during fault conditions.

How does the NX5P2090UKZ handle reverse current from VBUS to VINT?

The NX5P2090UKZ implements dedicated reverse bias current protection (RCP) that disables the internal N-channel MOSFET if VBUS exceeds VINT by more than 30 mV for longer than 4 ms or by more than 0.45 V. This prevents back-driving the VINT supply rail - a critical safeguard during USB OTG cable hot-plug events or when connected to higher-voltage hosts.

Can the NX5P2090UKZ operate with a 1.8 V microcontroller GPIO driving the EN pin?

Yes, the NX5P2090UKZ features integrated logic-level translation on the EN input, with a guaranteed VIH of 1.2 V and VIL of 0.4 V at VINT = 3.0–5.5 V. This allows direct interfacing with 1.8 V GPIOs without external level shifters, simplifying system design and reducing BOM count in portable applications using low-voltage processors.

What is the function of the VDET pin on the NX5P2090UKZ?

The VDET pin on the NX5P2090UKZ provides an analog voltage output (1.5–5.5 V) proportional to the VBUS voltage, enabling the host controller to monitor real-time VBUS level via an ADC input. Unlike digital fault indicators, VDET supports dynamic voltage regulation, cable quality detection, and compliance verification - adding diagnostic capability beyond basic ON/OFF control.