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Texas Instruments LM25066PSQE/NOPB
- Part No.:
- LM25066PSQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM25066PSQE/NOPB.pdf
- Description:
- IC POWER MANAGEMENT 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:239
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Product details
Overview
LM25066PSQE/NOPB from Texas Instruments is a PMBus™-compliant system power management and protection IC for hot-swap control and real-time telemetry. It operates from 2.9 V to 17 V input, delivers ±2.4% current measurement accuracy over temperature, supports 12-bit VIN/IIN/PIN/VOUT monitoring at 1-kHz sampling, and integrates programmable 25-mV/46-mV current limiting with configurable circuit breaker protection. It is deployed in server backplane power distribution to prevent damage during live board insertion.
For engineers reviewing the LM25066PSQE/NOPB datasheet, LM25066PSQE/NOPB pinout, LM25066PSQE/NOPB application, or LM25066PSQE/NOPB equivalent, key selection considerations include its 24-pin WQFN package, SMBus interface timing compliance (up to 400 kHz), dual-threshold undervoltage/overvoltage lockout with hysteresis, real-time power averaging via simultaneous VIN/IIN sampling, and black-box telemetry capture triggered by WARN/FAULT events.
Technical Context
The LM25066PSQE/NOPB implements a dedicated hot-swap controller block with fast-acting current limiting and fault detection logic that drives an external N-channel MOSFET gate. Its analog front-end uses precision current sensing across an external shunt resistor (SENSE–VIN) and performs true input power calculation by synchronously sampling VIN and IIN before computing PIN = VIN × IIN.
Its digital subsystem includes a PMBus™-compliant SMBus interface with SDA/SCL/SMBA pins, address configuration via ADR0–ADR2, and register-mapped telemetry storage for voltage, current, power, temperature, and fault status. The internal 2.73-V reference (VREF) and 12-bit ADC support auxiliary inputs (VAUX, DIODE) and enable remote thermal monitoring using an external diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9 V to 17 V - supports wide-range DC power buses including 3.3 V, 5 V, 12 V, and 15 V backplane systems. |
| Current Limit Threshold | 25 mV or 46 mV - selectable via CL pin; sets primary overcurrent trip point for hot-swap safety. |
| Current Measurement Accuracy | ±2.4% over –40°C to +85°C - enables precise load current monitoring without calibration drift. |
| Power Measurement Accuracy | ±3% over temperature - derived from synchronized 12-bit VIN/IIN sampling for true dynamic power reporting. |
| SMBus Frequency | Up to 400 kHz - compatible with standard high-speed SMBus timing requirements per JEDEC JESD36. |
| Telemetry Sampling Rate | 1 kHz - provides real-time visibility into transient power events and rapid fault response. |
| Package | 24-pin WQFN (5.0 mm × 4.0 mm) - thermally enhanced surface-mount package with exposed pad for PCB heat dissipation. |
Pinout & Package
The LM25066PSQE/NOPB is housed in a 5.0 mm × 4.0 mm, 24-pin WQFN package with an exposed thermal pad soldered to PCB ground for optimal thermal performance (RθJB = 13.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE | Current sense input | Measures voltage drop across external shunt resistor; determines IIN for protection and telemetry. |
| GATE | External MOSFET gate driver | Drives N-channel pass FET; output swings up to 20.3 V to ensure full enhancement under high VIN. |
| UVLO/EN | Undervoltage lockout & enable | Configurable turn-on threshold (1.16 V) with 150-mV hysteresis; also accepts remote shutdown signal. |
| OVLO | Overvoltage lockout | Turn-off threshold (1.16 V) with programmable hysteresis; protects downstream circuitry from overvoltage faults. |
| FB | Power Good feedback | Monitors regulated output via resistor divider; 1.167-V threshold with internal hysteresis ensures stable PGD assertion. |
| PGD | Power Good indicator | Open-drain output signaling valid VIN/VOUT; asserts high only when both supplies are within programmed limits. |
| SDA / SCL / SMBA | SMBus interface pins | Support PMBus™ command set for read/write of telemetry registers, fault logs, and configuration settings. |
| VAUX | Auxiliary analog input | Accepts 0–1.16 V signals for monitoring auxiliary rails or sensors with 283.2-µV LSB resolution. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable current limit | Selectable 25-mV or 46-mV threshold via CL pin-enables optimization for low-loss or high-protection designs. |
| Configurable circuit breaker | CB pin sets trip point at 1.8× or 3.6× current limit-provides graded response to hard shorts vs. overload conditions. |
| Real-time power averaging | Simultaneous 12-bit VIN/IIN sampling eliminates phase error in PIN = VIN × IIN computation-critical for accurate dynamic power telemetry. |
| Black-box telemetry capture | Automatically stores pre-fault telemetry (VIN, IIN, PIN, VOUT, temp) and device status upon WARN/FAULT trigger-enables root-cause analysis without host polling. |
| Remote temperature sensing | DIODE pin interfaces with external NPN diode-monitors MOSFET junction or board hotspot temperature with 9-bit resolution and ±10°C accuracy. |
Applications
| Server Backplane Power Distribution | Basestation Power Management |
|---|---|
Use Scenario: Hot-plugging compute blades into live 12-V or 48-V intermediate bus systems with strict inrush and short-circuit constraints. IC Role / Device Role / Timing Role: Primary hot-swap controller enforcing current ramp rate, detecting hard shorts within 0.6 µs, and asserting PGD only after stable output. Use Value: Prevents backplane brownouts and protects upstream power supplies using programmable insertion delay and fast circuit breaker response. | Use Scenario: Distributed power delivery across RF transceiver modules requiring independent rail monitoring and fault isolation. IC Role / Device Role / Timing Role: System-level power supervisor providing real-time IIN/PIN telemetry and SMBus-triggered shutdown on overtemperature or overvoltage. Use Value: Enables predictive maintenance and remote diagnostics via PMBus™-accessible power history and black-box snapshots. |
| Solid-State Circuit Breaker | Industrial Computing Power Control |
Use Scenario: Replacing electromechanical breakers in programmable logic controllers where fast, repeatable trip behavior is required. IC Role / Device Role / Timing Role: Precision current limiter and fault detector with configurable CB threshold and retry behavior (latch-off or auto-retry). Use Value: Eliminates contact wear and bounce; supports fail-safe operation via RETRY pin configuration and SMBA alert notification. | Use Scenario: Power sequencing and health monitoring in ruggedized edge servers operating in extended temperature environments. IC Role / Device Role / Timing Role: Dual-role telemetry hub and protection controller-measuring VAUX for auxiliary rail integrity while managing main rail hot-swap. Use Value: Reduces BOM count by consolidating voltage/current/power/temperature sensing and protection into single 24-pin IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hot-swap and power telemetry applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25066IY/NOPB | Same silicon die, identical electrical specs, but in 24-pin HTSSOP package (7.8 mm × 4.4 mm) with gull-wing leads. | Requires different PCB layout and reflow profile; less thermally efficient (RθJA = 52.5°C/W vs. 34.1°C/W). | Choose LM25066IY/NOPB only if through-hole or hand-soldering compatibility is required. |
| TPS2491PWR | Non-PMBus™ hot-swap controller with fixed 20-mV current limit, no power telemetry, and no black-box logging. | Lacks real-time power monitoring, SMBus interface, and fault snapshot capability-suitable only for basic current limiting. | Choose TPS2491PWR only when telemetry and digital configurability are unnecessary and cost is primary constraint. |
Compared with LM25066IY/NOPB, LM25066PSQE/NOPB offers superior thermal performance and smaller footprint; compared with TPS2491PWR, it adds full PMBus™ telemetry, programmable thresholds, and fault diagnostics-making it essential for intelligent power management in modern server and telecom infrastructure.
Availability
LM25066PSQE/NOPB is available at Aetrix Electronics and suitable for server backplane systems, basestation power distribution, solid-state circuit breaker implementations, and industrial computing power control requiring stable component supply and long-term lifecycle support.
Supply support for LM25066PSQE/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 company delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM25066 product line is designed specifically for intelligent hot-swap control and real-time power telemetry in high-availability computing and telecom infrastructure, emphasizing PMBus™ interoperability, precision measurement, and robust fault handling.
FAQ
What is the primary function of the LM25066PSQE/NOPB in a power system?
The LM25066PSQE/NOPB serves as a PMBus™-compliant hot-swap controller and power telemetry IC. It manages safe board insertion into live backplanes, enforces programmable current limits, detects overvoltage/undervoltage faults, and provides real-time 12-bit measurements of VIN, IIN, PIN, VOUT, and temperature. Its core value lies in combining protection and visibility in a single 24-pin WQFN device-LM25066PSQE/NOPB replaces discrete monitoring and control circuits in server and telecom power architectures.
How does the LM25066PSQE/NOPB achieve accurate input power measurement?
The LM25066PSQE/NOPB achieves ±3% input power accuracy by performing simultaneous 12-bit sampling of VIN and IIN at 1-kHz rate, then computing PIN = VIN × IIN in real time. This synchronous sampling eliminates phase-induced errors common in sequential ADC architectures. The internal 2.73-V reference (VREF) and precision current-sense amplifier ensure stability across –40°C to +85°C-LM25066PSQE/NOPB's true power calculation is validated in TI's SNVS654J datasheet Section 7.5.
Can the LM25066PSQE/NOPB be used without an external microcontroller?
Yes-the LM25066PSQE/NOPB operates autonomously for core protection functions: current limiting, UVLO/OVLO, circuit breaker tripping, and PGD assertion all execute independently of SMBus communication. Configuration (e.g., thresholds, retry behavior) can be set via hardware pins (CL, CB, RETRY). However, full telemetry access, black-box log retrieval, and dynamic reconfiguration require an SMBus host-LM25066PSQE/NOPB retains full standalone functionality even with SMBus lines unconnected.
What is the role of the TIMER pin on the LM25066PSQE/NOPB?
On the LM25066PSQE/NOPB, the TIMER pin controls three timing functions via a single external capacitor: insertion delay (time before GATE enables), fault timeout period (duration before circuit breaker triggers), and restart interval (delay between retry attempts). Its voltage thresholds (1.7 V upper, 1.0 V lower) define state transitions-LM25066PSQE/NOPB uses this pin to coordinate controlled power-up sequences and deterministic fault recovery without external timers or firmware.
Does the LM25066PSQE/NOPB support remote temperature monitoring?
Yes-the LM25066PSQE/NOPB supports remote temperature sensing via its DIODE pin, which sources a programmable current (9.4 µA low / 250 µA high) into an external NPN transistor configured as a diode. This enables monitoring of MOSFET junction temperature or other thermally sensitive components with ±10°C accuracy and 9-bit resolution-LM25066PSQE/NOPB's thermal telemetry is fully integrated into its PMBus™ register map for host-read accessibility.
LM25066PSQE/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)
LM25066PSQE/NOPB FAQ
1.How can I place an order for LM25066PSQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25066PSQE/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 LM25066PSQE/NOPB reliable?
The price and inventory of LM25066PSQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25066PSQE/NOPB is usually 5 days.
3.What payment methods are accepted for LM25066PSQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25066PSQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25066PSQE/NOPB?
LM25066PSQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25066PSQE/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 LM25066PSQE/NOPB?
For technical support, including LM25066PSQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25066PSQE/NOPB requirements.
6.How does Aetrix verify that LM25066PSQE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25066PSQE/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 LM25066PSQE/NOPB meets industry standards.
7.What is the process for return or replacement of LM25066PSQE/NOPB?
All LM25066PSQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25066PSQE/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 LM25066PSQE/NOPB part is unused and in its original packaging.
Return procedure for LM25066PSQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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