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Texas Instruments LM5056PMHX/NOPB
- Part No.:
- LM5056PMHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5056PMHX/NOPB.pdf
- Description:
- IC SUPERVISORY/SYS MGMT 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,436
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Product details
Overview
LM5056PMHX/NOPB from Texas Instruments is a high-voltage system power management IC with PMBus™ interface, designed for real-time telemetry of input voltage (10 V to 80 V), input current, input power (±2.25% accuracy), and remote temperature. It performs simultaneous VIN/IIN sampling for true power measurement and supports black-box fault capture in server backplane and industrial telemetry systems.
For engineers reviewing the LM5056PMHX/NOPB datasheet, LM5056PMHX/NOPB pinout, LM5056PMHX/NOPB application, or LM5056PMHX/NOPB equivalent, this device delivers 12-bit ADC resolution, programmable WARN/FAULT thresholds, SMBus-compliant command structure, and Kelvin-sense–enabled current monitoring - critical for high-reliability 48-V power distribution design.
Technical Context
The LM5056PMHX/NOPB integrates a 12-bit SAR ADC with round-robin acquisition (1 ms cycle) and hardware-averaging logic for VIN, IIN, PIN, VOUT, and VAUX over programmable intervals (0.001 s to 4 s). Its analog front-end includes anti-parallel diode protection between VIN_K/SENSE (±3.0 V max) and VIN/VIN_K (±0.3 V max), enforcing strict Kelvin layout requirements.
It implements a PMBus-compliant SMBus 2.0 interface with SMBA alert output, tri-state address pins (ADR0–ADR2), and dual current-sense FSR selection (27.0 mV or 54.4 mV via CL pin), enabling flexible full-scale current configuration without firmware reprogramming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10 V to 80 V - supports 48-V telecom and industrial backplane rails with ±1.0% VIN accuracy over –40°C to +85°C |
| Power Measurement Accuracy | ±2.25% - achieved via simultaneous sampling of VIN and IIN, enabling true real-time input power calculation |
| ADC Resolution | 12 bits - provides 21.7 mV LSB for VIN (0–88.9 V FSR) and 6.70 μV LSB for IIN (CL = VDD, 27.0 mV FSR) |
| Current Sense FSR Options | 27.0 mV or 54.4 mV - selected by CL pin state, allowing optimized dynamic range for 10 A–200 A sense applications |
| Remote Temperature Sensing | ±2°C accuracy (25°C–85°C) using external MMBT3904 diode - enables thermal monitoring of hotspots without local sensor placement |
| Operating Temperature Range | –40°C to +125°C junction - validated for continuous operation in enclosed industrial enclosures and base station cabinets |
| PMBus Compliance | Full SMBus 2.0 and PMBus 1.1 command set - supports READ_VIN, READ_IIN, READ_PIN, READ_TEMPERATURE_1, OT_WARN_LIMIT, and DEVICE_SETUP |
Pinout & Package
LM5056PMHX/NOPB is housed in a thermally enhanced 28-pin HTSSOP package (PWP) with exposed pad soldered to PCB ground plane for θJCbot = 2.9°C/W thermal resistance. The package supports high-power dissipation in compact 48-V telemetry modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Auxiliary HV telemetry input | Measures output voltage up to 80 V; enables independent VOUT monitoring without external divider |
| SENSE (Pin 3) & VIN_K (Pin 4) | Differential current sense inputs | Accept Kelvin-connected sense resistor; ±3.0 V absolute max differential prevents damage during transients |
| VIN (Pin 5) | Main supply and telemetry input | 10–80 V input rail connection; also measured for real-time VIN telemetry and POREN enable (7.5–9.7 V threshold) |
| SDAO/SDAI/SCL/SMBA (Pins 11–14) | SMBus physical layer | Supports bidirectional PMBus communication; SMBA provides open-drain fault alert independent of host polling |
| CL (Pin 22) | Current range select output | Hardware-selects 27.0 mV or 54.4 mV IIN full-scale range; overrides DEVICE_SETUP command default at power-up |
| DIODE (Pin 16) | Remote temperature diode driver | Sources 9.4 µA DC + 250 µA pulse for diode voltage measurement; requires <1 Ω parasitic resistance for ±2°C accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous VIN/IIN sampling | Enables true real-time power calculation (PIN = VIN × IIN) without time-skew error - critical for transient power analysis |
| Black-box telemetry capture | Automatically stores VIN, IIN, PIN, VOUT, VAUX, temperature, and status registers upon WARN/FAULT trigger - aids root-cause analysis |
| Programmable hardware averaging | Configurable 1-ms to 4-s averaging window for all telemetry channels - reduces MCU polling load and improves noise immunity |
| Anti-parallel diode protection | Integrated VIN_K/SENSE and VIN/VIN_K clamps limit differential stress to ±3.0 V and ±0.3 V - enforces Kelvin routing discipline |
| VAUX auxiliary telemetry input | 0–2.966 V full-scale range with ±1.3% accuracy - monitors auxiliary rails (e.g., 3.3-V control logic) without external scaling |
Applications
| Server Backplane Monitoring | Base Station Power Distribution |
|---|---|
Use Scenario: Real-time telemetry of 48-V input bus feeding multiple blade servers in a rack-mounted chassis. IC Role / Device Role / Timing Role: High-voltage telemetry hub measuring VIN, IIN, PIN, and temperature at each slot; reports via PMBus to system manager. Use Value: Enables dynamic power capping, predictive maintenance, and fault isolation without adding discrete ADCs or current shunt amplifiers. |
Use Scenario: Input power supervision for distributed 48-V power feeds across RF amplifier cabinets in cellular base stations. IC Role / Device Role / Timing Role: System-level power monitor interfacing with baseband controller via SMBus; triggers SMBA on overcurrent or overtemperature. Use Value: Replaces discrete sensing + microcontroller solution, reducing BOM count and eliminating firmware development for basic telemetry. |
| Industrial Telemetry Node | High-Reliability 48-V DC Distribution Panel |
Use Scenario: Remote monitoring of input power quality and thermal conditions in factory automation PLC power supplies. IC Role / Device Role / Timing Role: Standalone telemetry node capturing black-box snapshots on undervoltage or overtemperature events. Use Value: Provides timestamped fault data for compliance reporting and field failure analysis without host dependency. |
Use Scenario: Centralized power health monitoring in railway signaling or process control DC distribution panels. IC Role / Device Role / Timing Role: Primary telemetry IC measuring total input power, per-rail current, and ambient temperature with programmable WARN thresholds. Use Value: Delivers ±2.25% power accuracy and 12-bit resolution - meets IEC 61000-4-30 Class A requirements for energy metering in industrial settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage PMBus telemetry applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5056AMHX/NOPB | Improved accuracy: ±1.75% PIN, ±1.25% IIN vs. ±2.25% and ±1.5% for LM5056PMHX/NOPB | Same pinout and firmware compatibility; higher accuracy required for revenue-grade metering | Select LM5056AMHX/NOPB when ±1.75% power accuracy is mandatory and cost premium is acceptable |
| INA226AIDGST | No integrated PMBus stack or black-box capture; 16-bit delta-sigma ADC only measures I/V; requires external MCU for telemetry processing | Used in custom telemetry designs where flexibility > integration; lacks remote diode sensing and VAUX input | Choose INA226AIDGST only if existing MCU handles PMBus protocol and application needs higher-resolution current-only measurement |
Compared with LM5056AMHX/NOPB, the LM5056PMHX/NOPB trades 0.5% power accuracy for lower cost and identical integration; versus INA226AIDGST, it delivers complete turnkey telemetry but with lower ADC resolution and fixed PMBus command set.
Availability
LM5056PMHX/NOPB is available at Aetrix Electronics and suitable for server backplane systems, base station power distribution systems, and industrial telemetry applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5056PMHX/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 and embedded processing technologies, with decades of expertise in power management and digital interface solutions.
The LM5056 product line was developed specifically for intelligent, standards-compliant telemetry in high-voltage DC distribution systems - targeting telecom, industrial, and infrastructure applications where reliability and PMBus interoperability are essential.
FAQ
What is the primary function of the LM5056PMHX/NOPB in a power system?
The LM5056PMHX/NOPB serves as a high-voltage telemetry hub that continuously measures and reports input voltage (10 V–80 V), input current, input power, output voltage, auxiliary voltage, and remote temperature via PMBus. It enables real-time system health monitoring, fault logging, and power optimization in 48-V backplane and industrial power distribution architectures without requiring an external microcontroller.
Does the LM5056PMHX/NOPB require an external microcontroller to operate?
No - the LM5056PMHX/NOPB operates autonomously: it powers up when VIN exceeds 7.5 V, performs continuous ADC conversions, executes hardware averaging, and responds to PMBus commands without firmware. An external MCU is optional and used only for advanced configuration or integration into larger management systems.
How does the LM5056PMHX/NOPB achieve ±2.25% input power accuracy?
The LM5056PMHX/NOPB achieves ±2.25% input power accuracy by simultaneously sampling VIN and IIN using its internal 12-bit ADC and computing PIN = VIN × IIN in hardware. This eliminates time-skew errors inherent in sequential sampling, and the result is validated across –40°C to +85°C with simultaneous 22-mV sense voltage and VDD bias conditions.
Can the LM5056PMHX/NOPB monitor output voltage independently of the input rail?
Yes - the LM5056PMHX/NOPB includes a dedicated OUT pin (Pin 1) rated for 0–80 V, allowing direct high-side measurement of VOUT without external resistive dividers. This enables independent tracking of downstream converter output voltage while maintaining galvanic isolation from the input telemetry path.
What is the role of the CL pin on the LM5056PMHX/NOPB?
The CL pin (Pin 22) is a hardware current-range select output that configures the full-scale range of the current sense amplifier to either 27.0 mV (CL = VDD) or 54.4 mV (CL = DGND). This setting is latched at power-up and takes precedence over the DEVICE_SETUP PMBus command, ensuring deterministic current measurement range before firmware initialization.
LM5056PMHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Base Station-Networking Line Cards, Servers
- Current - Supply:
- 6.8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
LM5056PMHX/NOPB FAQ
1.How can I place an order for LM5056PMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5056PMHX/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 LM5056PMHX/NOPB reliable?
The price and inventory of LM5056PMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5056PMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5056PMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5056PMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5056PMHX/NOPB?
LM5056PMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5056PMHX/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 LM5056PMHX/NOPB?
For technical support, including LM5056PMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5056PMHX/NOPB requirements.
6.How does Aetrix verify that LM5056PMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5056PMHX/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 LM5056PMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5056PMHX/NOPB?
All LM5056PMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5056PMHX/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 LM5056PMHX/NOPB part is unused and in its original packaging.
Return procedure for LM5056PMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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