NXP Semiconductors NX3P2902BUKZ

Overview

NX3P2902BUKZ from NXP Semiconductors is a logic-controlled high-side load switch featuring a low-R_ON P-channel MOSFET, 1.1 V to 3.6 V supply range, 500 mA continuous current capability, integrated output discharge resistor, and 95 mΩ R_ON at 1.8 V - used for power domain isolation in portable battery-powered systems to reduce quiescent current and extend runtime.

For engineers reviewing the NX3P2902BUKZ datasheet, NX3P2902BUKZ pinout, NX3P2902BUKZ application, or NX3P2902BUKZ equivalent, key selection criteria include ON-resistance vs. input voltage, enable logic level translation compatibility with sub-1.8 V controllers, OFF-state leakage (<600 nA), thermal resistance (130 K/W), and WLCSP4 package integration constraints.

Technical Context

The NX3P2902BUKZ implements a single high-side P-MOSFET switch with active-high enable logic, internal slew-rate control on turn-on, and an integrated 90–120 Ω output discharge path. Its logic-level translation allows EN to be driven directly by 1.2 V logic even when VIN = 3.6 V.

It operates across −40 °C to +85 °C ambient, supports up to ±1000 mA peak switch current at 25 °C (derated to ±500 mA at 85 °C), and features HBM ESD protection exceeding 4000 V and CDM exceeding 500 V - meeting industrial reliability requirements without external protection components.

Key Specifications

Pinout & Package

Package: WLCSP4 (Wafer-Level Chip-Scale Package), 0.77 × 0.77 × 0.51 mm, backside coated, 4-bump configuration with standard ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS22915BYFPR and BD6524HFV-TR, the NX3P2902BUKZ uniquely balances ultra-small WLCSP4 footprint, 1.2 V logic compatibility, and integrated discharge - making it optimal for next-generation compact battery-powered devices where board area and deep-sleep current are primary constraints.

Availability

NX3P2902BUKZ is available at Aetrix Electronics and suitable for smartphone power management, portable medical monitor subsystems, wireless audio device sequencing, and digital camera module isolation requiring stable component supply and long-term lifecycle support.

Supply support for NX3P2902BUKZ 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 NX3P2902BUKZ belongs to NXP's NX3P family of ultra-low-power, logic-compatible high-side load switches - designed specifically for battery-operated portable electronics demanding minimal quiescent current, small form factor, and seamless integration with low-voltage processors.

FAQ

What is the maximum allowable input voltage for NX3P2902BUKZ?

The absolute maximum input voltage (VIN) for NX3P2902BUKZ is +4.0 V, as specified in Table 5 of the datasheet. Operation beyond this rating - even momentarily - risks permanent damage. For reliable long-term use, the recommended operating range remains 1.1 V to 3.6 V, and the device must never be exposed to voltages exceeding +4.0 V on VIN, VOUT, or EN pins relative to GND.

Does NX3P2902BUKZ require an external pull-down resistor on the EN pin?

No, NX3P2902BUKZ does not require an external pull-down resistor on the EN pin. The device incorporates internal input leakage control and defined logic thresholds (VIL ≤ 0.45 V, VIH ≥ 1.2 V), and its enable input is designed for direct connection to microcontroller GPIOs. External pull-downs are unnecessary unless system-level noise immunity requirements exceed the device's native noise margin.

Can NX3P2902BUKZ drive a 10 µF capacitive load at 3.3 V without inrush issues?

Yes, NX3P2902BUKZ can safely drive a 10 µF capacitive load at 3.3 V due to its built-in turn-on slew rate limiting. At VIN = 3.3 V, typical turn-on time (t_on) is 150–280 µs, which inherently limits inrush di/dt. Measured ground current data (Figure 5–6) confirms stable behavior under such conditions, eliminating risk of supply droop or brownout in properly decoupled systems.

What is the thermal performance of NX3P2902BUKZ in a standard two-layer PCB layout?

In a standard two-layer PCB layout per datasheet conditions (Tamb = 85 °C), NX3P2902BUKZ exhibits a typical junction-to-ambient thermal resistance (R_th(j-a)) of 130 K/W. This value assumes solid copper connections on both layers and via stitching to internal planes. With 500 mA load current and 95 mΩ R_ON, power dissipation is ~24 mW, resulting in a junction temperature rise of ~3.1 °C above ambient - well within safe operating limits.

Is NX3P2902BUKZ qualified for automotive applications?

No, NX3P2902BUKZ is not automotive-qualified. Per Section 16.3 of the datasheet, it is explicitly designated as a non-automotive qualified product - neither tested nor warranted for AEC-Q100 compliance. It is intended for industrial, consumer, and portable electronics applications only. For automotive use, designers must select NXP's automotive-grade alternatives such as the NX3P2904 series.