Texas Instruments LM25066IPSQ/NOPB

Overview

LM25066IPSQ/NOPB from Texas Instruments is an Intel Node Manager 2.0/2.5-compliant system power management and protection IC with PMBus™ interface, integrating hot-swap controller, 12-bit telemetry ADC, and real-time power/voltage/current monitoring. It operates from 2.9V to 17V input, supports ±1% current measurement accuracy (LM25066IA variant), and delivers programmable 25mV/46mV current limit thresholds for server backplane and solid-state circuit breaker applications.

For engineers reviewing the LM25066IPSQ/NOPB datasheet, LM25066IPSQ/NOPB pinout, LM25066IPSQ/NOPB application, or LM25066IPSQ/NOPB equivalent, this device enables precise power telemetry, configurable circuit breaker response, black-box fault capture, and SMBus-based system-level power health monitoring in high-availability infrastructure.

Technical Context

The LM25066IPSQ/NOPB implements a dual-stage protection architecture: fast-acting current limiting during insertion (via TIMER pin-controlled ramp) and hard short circuit breaking (programmable 1.8× or 3.6× over-current threshold). Its PMBus 1.2 interface supports READ_EIN for true input energy accumulation and stores telemetry snapshots on WARN/FAULT events.

Internally, it integrates a 24-lead WQFN-packaged analog front-end with simultaneous sampling of VIN, VOUT, IIN, PIN, and VAUX at 1 kHz, plus auxiliary diode temperature sensing. The GATE driver delivers up to 18.8V output with 22 µA source current and includes Miller capacitance suppression during startup.

Key Specifications

Pinout & Package

LM25066IPSQ/NOPB uses a 24-lead WQFN package (5 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad soldered to ground plane for thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar system power management and protection applications.

Compared with LM250661IRSQT, LM25066IPSQ/NOPB offers full Node Manager 2.5 compliance but lacks extended PMBus features and tighter thermal specs; versus TPS2490PWR, it trades simplicity for comprehensive telemetry and standards-driven system integration - making it essential for intelligent infrastructure.

Availability

LM25066IPSQ/NOPB is available at Aetrix Electronics and suitable for server backplane systems, basestation power distribution systems, and solid-state circuit breaker (eFuse) designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LM25066IPSQ/NOPB 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 decades of expertise in high-reliability infrastructure ICs.

The LM25066I product line was designed specifically for Intel Node Manager–compliant server and telecom power systems, delivering integrated hot-swap control, PMBus telemetry, and energy-aware protection in compact WQFN packages.

FAQ

What is the primary function of the LM25066IPSQ/NOPB in a server power architecture?

The LM25066IPSQ/NOPB serves as an Intel Node Manager–compliant system power manager and protector, combining hot-swap control, real-time telemetry (VIN, IIN, PIN, VOUT, VAUX), and PMBus 1.2 communication. It enables precise inrush current limiting, programmable circuit breaker response, and energy accumulation via READ_EIN - all critical for server backplane reliability and platform power management. LM25066IPSQ/NOPB replaces discrete protection and monitoring functions with a single, standards-aligned IC.

Does the LM25066IPSQ/NOPB support true input energy measurement?

Yes, the LM25066IPSQ/NOPB supports the READ_EIN PMBus command, which performs simultaneous sampling of VIN and IIN to compute true input energy accumulation. This capability is explicitly required for Intel Node Manager 2.0/2.5 compliance and enables accurate energy accounting in server platforms. LM25066IPSQ/NOPB implements this function in hardware with no host CPU intervention needed.

How does the LM25066IPSQ/NOPB handle short-circuit faults?

The LM25066IPSQ/NOPB employs a dual-tier fault response: first, current limiting activates when VIN–SENSE exceeds the CL-selected threshold (25mV or 46mV); second, the circuit breaker engages if the fault persists beyond the timer threshold or exceeds the CB-scaled level (1.8× or 3.6× CL). Upon detection, it can either latch off (RETRY = VDD) or retry indefinitely (RETRY = GND), and captures black-box telemetry before shutdown. LM25066IPSQ/NOPB ensures sub-millisecond response to hard shorts while preserving telemetry integrity.

What package type and thermal characteristics does the LM25066IPSQ/NOPB use?

The LM25066IPSQ/NOPB uses a 24-pin WQFN package (5 mm × 4 mm, 0.5 mm pitch) with an exposed thermal pad soldered to the PCB ground plane. Its junction-to-ambient thermal resistance (θJA) is 42.3°C/W under JEDEC 4-layer board conditions, and junction-to-case (θJC) is 9.5°C/W - enabling efficient heat dissipation in high-power-density server and telecom applications. LM25066IPSQ/NOPB requires proper thermal pad layout per TI's SNVS824C datasheet guidelines.

Can the LM25066IPSQ/NOPB monitor external component temperature?

Yes, the LM25066IPSQ/NOPB includes a dedicated DIODE pin that interfaces with an external NPN transistor configured as a diode for remote temperature sensing. It provides a 250–300 µA current source and measures junction temperature with ±10°C accuracy across –40°C to +85°C ambient. This allows direct thermal monitoring of the external MOSFET or other thermally sensitive components without additional ICs. LM25066IPSQ/NOPB integrates this data into its telemetry stream and supports temperature-based WARN/FAULT thresholds via PMBus.