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Texas Instruments LM25066IAPSQX/NOPB
- Part No.:
- LM25066IAPSQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM25066IAPSQX/NOPB.pdf
- Description:
- IC PWR MGMT/PROT PMBUS 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,713
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Product details
Overview
LM25066IAPSQX/NOPB from Texas Instruments is an Intel Node Manager 2.0/2.5-compliant system power management and protection IC with PMBus™ interface, operating from 2.9V to 17V input. It integrates hot-swap control, real-time telemetry (VIN, IIN, PIN, VOUT, VAUX, temperature), programmable current/power limiting, and circuit breaker protection. Used in server backplane systems for precise inrush control and fault response.
For engineers reviewing the LM25066IAPSQX/NOPB datasheet, LM25066IAPSQX/NOPB pinout, LM25066IAPSQX/NOPB application, or LM25066IAPSQX/NOPB equivalent, key selection criteria include PMBus compliance, READ_EIN energy accumulator capability, ±1% current measurement accuracy (LM25066IA variant), 12-bit telemetry resolution, and WQFN-24 thermal performance.
Technical Context
The LM25066IAPSQX/NOPB implements a dual-stage protection architecture: programmable current limiting (25mV/46mV thresholds) combined with power limiting via external resistor on PWR pin, both feeding into a fast-acting circuit breaker (response <1.2 µs). Its telemetry subsystem uses simultaneous sampling and hardware averaging (0.001–4 s intervals) across VIN, IIN, PIN, and VOUT channels.
Control logic includes configurable UVLO/OVLO with hysteresis, RETRY latching behavior, and TIMER-based insertion delay/fault timeout. The SMBus/I²C interface supports full PMBus 1.2 command set including READ_EIN, black box telemetry capture on WARN/FAULT, and SMBA alert notification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 17V - supports wide-range server and telecom supply rails with transient tolerance to 24V. |
| Current Limit Threshold | 25mV or 46mV - selectable via CL pin; sets overcurrent trip point for MOSFET gate control. |
| Telemetry Resolution | 12-bit ADC with 1 kHz sampling - enables high-fidelity real-time monitoring of voltage, current, power, and auxiliary inputs. |
| Current Measurement Accuracy | ±1% (LM25066IA) - verified over −40°C to +85°C; critical for accurate power budgeting in dense server boards. |
| Power Measurement Accuracy | ±2.0% (LM25066IA) - supports precise input power tracking and energy accounting via READ_EIN command. |
| Package | 24-pin WQFN (5 mm × 4 mm, 0.5 mm pitch) - exposed thermal pad improves junction-to-board thermal resistance (θJA = 42.3°C/W). |
| PMBus Compliance | Fully Intel Node Manager 2.0/2.5 and PMBus 1.2 compliant - enables standardized firmware integration with system management controllers. |
Pinout & Package
LM25066IAPSQX/NOPB is housed in a thermally enhanced 24-lead WQFN package (5 mm × 4 mm, 0.5 mm pitch) with exposed pad soldered to PCB ground plane for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE | Current sense differential input | Measures voltage drop across external sense resistor (RS); triggers current limiting when threshold reached. |
| GATE | MOSFET gate drive output | Drives external N-channel MOSFET gate; features 18.8V zener clamp and 22 µA charge pump for controlled turn-on. |
| OUT | Output feedback node | Connects to MOSFET source; used for VDS monitoring, power limiting calculation, and PGD assertion. |
| VIN | Main input supply | Primary power rail input (2.9–17V); powers internal regulator and telemetry circuits. |
| UVLO/EN & OVLO | Programmable voltage lockout inputs | External resistor dividers set under/over-voltage thresholds with 23 µA hysteresis current source. |
| SDA / SCL / SMBA | PMBus interface signals | Standard SMBus 2.0-compatible data/clock/alert lines supporting PMBus 1.2 commands including READ_EIN. |
| PWR | Power limit set input | External resistor defines maximum allowable power dissipation in series MOSFET (Safe Operating Area control). |
| VAUX | Auxiliary analog input | 0–1.16V full-scale telemetry channel for monitoring auxiliary voltages (e.g., VRM outputs, fan supplies). |
Key Features
| Feature | Design Value |
|---|---|
| READ_EIN energy accumulator | Accurately measures true input energy via simultaneous sampling - enables precise power consumption tracking and billing in managed systems. |
| Black box telemetry capture | Stores time-stamped VIN, IIN, PIN, VOUT, temperature, and status registers upon WARN/FAULT event - aids root-cause analysis without host intervention. |
| Configurable circuit breaker | Trips at 1.8× or 3.6× current limit threshold (via CB pin) - provides fast (<1.2 µs) short-circuit protection independent of slower power-limit loop. |
| Hardware averaging engine | Programmable interval (0.001–4 s) for VIN, IIN, PIN, VOUT - reduces noise sensitivity and enables stable long-term trend monitoring. |
| Remote diode temperature sensing | Supports external NPN transistor for MOSFET junction temperature monitoring - extends thermal protection beyond die temperature. |
Applications
| Server Backplane Power Management | Solid-State Circuit Breaker (eFuse) |
|---|---|
|
Use Scenario: Hot-plug insertion of compute blades into live 12V backplane with strict dV/dt and inrush current limits. IC Role / Device Role / Timing Role: Controls MOSFET gate slew rate during insertion; enforces programmable current limit and power limit to prevent bus sag and downstream resets. Use Value: Enables zero-downtime blade replacement while maintaining system stability and meeting Intel Node Manager telemetry requirements. |
Use Scenario: Replacing electromechanical fuses in 48V telecom distribution units requiring fast, repeatable fault clearing. IC Role / Device Role / Timing Role: Acts as intelligent eFuse with sub-millisecond circuit breaker response and configurable retry/latch behavior. Use Value: Eliminates fuse replacement labor, supports remote fault logging via PMBus, and maintains SOA compliance under sustained overload. |
| Basestation Power Distribution | Industrial Embedded Power Monitoring |
|
Use Scenario: Distributed 24V/48V power delivery to RF transceivers with real-time load profiling and thermal derating. IC Role / Device Role / Timing Role: Monitors input power and auxiliary rail voltages (VAUX), triggers SMBA alerts on over-power events, logs telemetry snapshots. Use Value: Provides granular per-rail power data for predictive maintenance and dynamic thermal management in enclosed basestations. |
Use Scenario: Power integrity monitoring in ruggedized industrial controllers where field-replaceable modules require validated energy usage records. IC Role / Device Role / Timing Role: Implements READ_EIN-based energy accumulation and stores black box snapshots on brownout or overtemperature faults. Use Value: Delivers auditable power history for warranty analysis and ensures deterministic fault response in safety-critical deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar system power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25066IAIPSQX/NOPB | Higher current accuracy (±1% vs ±2.4% for LM25066I), same pinout and PMBus feature set. | Preferred for precision power budgeting where current measurement fidelity is critical (e.g., AI accelerator racks). | Select LM25066IAIPSQX/NOPB when ±1% IIN accuracy is required; otherwise LM25066IAPSQX/NOPB offers cost-optimized Node Manager compliance. |
| TPS2491PWR | No PMBus interface; analog-only configuration via resistors; lacks READ_EIN, black box, and VAUX telemetry. | Suitable for simpler hot-swap applications without system-level telemetry or firmware integration needs. | Choose TPS2491PWR only if PMBus telemetry, energy accumulation, and multi-parameter monitoring are unnecessary. |
Compared with LM25066IAIPSQX/NOPB, LM25066IAPSQX/NOPB trades ±1% current accuracy for lower cost while retaining identical Node Manager compliance, READ_EIN, and black box functionality; versus TPS2491PWR, it adds full PMBus telemetry at the expense of analog configurability and higher BOM complexity.
Availability
LM25066IAPSQX/NOPB is available at Aetrix Electronics and suitable for server backplane systems, solid-state circuit breaker implementations, and basestation power distribution requiring stable component supply, long-term lifecycle support, and Intel Node Manager 2.5 compliance.
Supply support for LM25066IAPSQX/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 power IC design.
The LM25066IAPSQX/NOPB belongs to TI's system power management portfolio, engineered specifically for intelligent hot-swap control and telemetry in datacenter, telecom, and industrial infrastructure where PMBus-standardized monitoring and Node Manager compliance are mandatory.
FAQ
What is the primary function of the LM25066IAPSQX/NOPB in a server backplane?
The LM25066IAPSQX/NOPB serves as an intelligent hot-swap controller and power monitor, enforcing inrush current limits, detecting overcurrent/overvoltage faults, and providing real-time telemetry (VIN, IIN, PIN, VOUT, temperature) via PMBus to the system management controller. It ensures safe hot-plug operation while meeting Intel Node Manager 2.5 requirements.
Does the LM25066IAPSQX/NOPB support energy measurement, and how is it implemented?
Yes, the LM25066IAPSQX/NOPB supports true input energy measurement via the READ_EIN PMBus command. It uses simultaneous sampling of VIN and IIN to compute instantaneous power and integrate over time, delivering accurate energy accumulation without host CPU overhead.
How does the circuit breaker function differ from the current limit function in the LM25066IAPSQX/NOPB?
The current limit operates continuously to regulate load current during startup or overload, while the circuit breaker is a fast-acting (sub-microsecond) hard shutdown triggered when current exceeds 1.8× or 3.6× the programmed limit (set by CB pin). It protects against catastrophic shorts independently of the slower power-limit loop.
What telemetry data can be captured in the LM25066IAPSQX/NOPB's black box mode?
The LM25066IAPSQX/NOPB captures a time-stamped snapshot of VIN, IIN, PIN, VOUT, VAUX, temperature, and device status registers upon WARN or FAULT assertion. This data is stored in nonvolatile memory and retrievable via PMBus for post-fault diagnostics without host intervention.
Is the LM25066IAPSQX/NOPB pin-compatible with the LM25066IAIPSQX/NOPB?
Yes, the LM25066IAPSQX/NOPB and LM25066IAIPSQX/NOPB share identical pinout, package, and electrical interface. They differ only in internal calibration - the LM25066IA variant delivers ±1% current measurement accuracy versus ±2.4% for the LM25066I, making them direct drop-in replacements where accuracy requirements permit.
LM25066IAPSQX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Base Station-Networking Line Cards, Servers
- Current - Supply:
- 5.8mA
- Voltage - Supply:
- 2.9V ~ 17V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x5)
LM25066IAPSQX/NOPB FAQ
1.How can I place an order for LM25066IAPSQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25066IAPSQX/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM25066IAPSQX/NOPB reliable?
The price and inventory of LM25066IAPSQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25066IAPSQX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25066IAPSQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25066IAPSQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25066IAPSQX/NOPB?
LM25066IAPSQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25066IAPSQX/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM25066IAPSQX/NOPB?
For technical support, including LM25066IAPSQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25066IAPSQX/NOPB requirements.
6.How does Aetrix verify that LM25066IAPSQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25066IAPSQX/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM25066IAPSQX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25066IAPSQX/NOPB?
All LM25066IAPSQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25066IAPSQX/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM25066IAPSQX/NOPB part is unused and in its original packaging.
Return procedure for LM25066IAPSQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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