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Texas Instruments LM5056APMHX/NOPB
- Part No.:
- LM5056APMHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5056APMHX/NOPB.pdf
- Description:
- IC SUPERVISORY/SYS MGMT 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,647
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Product details
Overview
LM5056APMHX/NOPB from Texas Instruments is a high-voltage system power management IC with PMBus™ interface, designed for real-time telemetry of input voltage (10–80 V), input current, input power (±1.75% accuracy), and remote temperature in server backplane and industrial power distribution systems.
For engineers reviewing the LM5056APMHX/NOPB datasheet, LM5056APMHX/NOPB pinout, LM5056APMHX/NOPB application, or LM5056APMHX/NOPB equivalent, this device delivers 12-bit simultaneous VIN/IIN sampling, programmable WARN/FAULT thresholds, black-box telemetry capture, and SMBus-compliant command structure for embedded power monitoring.
Technical Context
The LM5056APMHX/NOPB integrates a 12-bit ADC with round-robin acquisition time of 1 ms, supporting simultaneous sampling of VIN and IIN to enable true real-time input power calculation. Its analog front-end includes dedicated sense amplifier inputs (VIN_K/SENSE) with ±3.0 V differential tolerance and CL pin-selectable full-scale ranges (27.0 mV or 54.4 mV).
It implements a PMBus-compliant SMBus interface with active-low SMBA alert output, tri-state address pins (ADR0–ADR2), and internal 2.97 V reference (±0.03 V over temperature). The device operates across –40°C to +125°C junction temperature and requires external 5.0 V ±10% VDD supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10 V to 80 V - supports 48 V telecom and industrial backplane rails without external level-shifting. |
| Power Measurement Accuracy | ±1.75% - LM5056A-grade precision enables accurate energy accounting and thermal derating decisions. |
| Current Measurement Accuracy | ±1.25% - tight tolerance ensures reliable overcurrent detection and load profiling at full scale. |
| ADC Resolution | 12-bit - provides 21.7 mV LSB for VIN and 6.7 μV LSB for IIN (CL = VDD), enabling fine-grained telemetry. |
| Sampling Rate | 1 kHz - enables real-time response to transient events such as hot-swap surges or short-circuit faults. |
| Remote Temperature Sensing | ±2°C accuracy (25°C–85°C) using external MMBT3904 diode - supports thermal monitoring of FETs, connectors, or PCB hotspots. |
| Operating Junction Temp | –40°C to +125°C - qualified for harsh industrial and telecom environments without derating. |
Pinout & Package
LM5056APMHX/NOPB is housed in a thermally enhanced 28-pin HTSSOP package (PWP) with exposed pad soldered to ground plane for θJCbot = 2.9°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Auxiliary HV telemetry input | Measures VOUT or other system voltages up to 80 V; enables dual-rail monitoring without external dividers. |
| SENSE (Pin 3) / VIN_K (Pin 4) | Differential current sense inputs | Accepts Kelvin-connected sense resistor; ±3.0 V max differential prevents damage during transients. |
| VIN (Pin 5) | Main high-voltage supply input | Provides power and voltage telemetry source; POREN threshold at 8.7 V enables controlled startup. |
| SDAO / SDAI / SCL / SMBA (Pins 11–14) | PMBus/SMBus interface | Supports standard PMBus commands (READ_TEMPERATURE_1, READ_VIN, etc.) and hardware alert signaling. |
| VREF (Pin 15) | Internal 2.97 V reference output | Stable reference for ADC; requires 1 μF bypass to AGND for noise immunity and POR reset functionality. |
| DIODE (Pin 16) | Remote temperature sensor driver | Sources 9.4 μA DC + 250 μA pulses for diode-based temperature measurement; layout-critical for accuracy. |
| CL (Pin 22) | Current range select | Hardware-selectable full-scale sense voltage (27.0 mV or 54.4 mV) enables optimal dynamic range for varied loads. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous VIN/IIN sampling | Enables true real-time power calculation without time-skew error-critical for accurate peak power capture. |
| Black-box telemetry capture | Automatically stores VIN, IIN, PIN, VOUT, temperature, and status registers upon WARN/FAULT trigger for root-cause analysis. |
| Programmable averaging interval | 0.001 s to 4 s averaging window allows trade-off between responsiveness and noise rejection in telemetry streams. |
| Remote diode temperature sensing | Integrated current source and 9-bit resolution support thermal monitoring of MOSFETs, connectors, or heatsinks without external ICs. |
| PMBus v1.2 compliance | Supports standard commands including READ_VIN, READ_IIN, READ_PIN, OT_WARN_LIMIT, and DEVICE_SETUP for seamless system integration. |
Applications
| Server Backplane Monitoring | Base Station Power Distribution |
|---|---|
|
Use Scenario: Real-time telemetry of 48 V input rail in modular server chassis with hot-swap capability. IC Role / Device Role / Timing Role: High-voltage telemetry hub measuring VIN, IIN, PIN, and temperature per slot; triggers SMBA on overcurrent or overtemperature. Use Value: Enables predictive maintenance and dynamic power capping via PMBus host, reducing unplanned downtime by correlating load trends with thermal events. |
Use Scenario: Input power supervision in distributed radio unit (DRU) power supplies feeding multiple RF amplifiers. IC Role / Device Role / Timing Role: Monitors input current and power at 48 V bus entry point; captures black-box snapshot on FAULT to diagnose surge-induced failures. Use Value: Provides traceable fault records for field return analysis and validates compliance with IEC 61000-4-5 surge immunity requirements. |
| Industrial Telemetry Gateway | High-Power LED Driver Supervision |
|
Use Scenario: Centralized power health monitoring in programmable logic controller (PLC) backplanes with mixed 24 V/48 V modules. IC Role / Device Role / Timing Role: Measures VAUX from auxiliary 24 V rail and VIN from main 48 V rail simultaneously; reports via SMBus to PLC CPU. Use Value: Eliminates need for separate voltage monitors per rail, reducing BOM count while maintaining ±1.0% VIN and ±1.3% VAUX accuracy. |
Use Scenario: Telemetry feedback for constant-current LED drivers powering high-brightness arrays in outdoor signage. IC Role / Device Role / Timing Role: Reads VOUT and IIN to compute actual delivered power; monitors remote diode on LED heatsink for thermal foldback control. Use Value: Enables luminosity stabilization via closed-loop thermal compensation, extending LED lifetime by preventing >85°C junction operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage telemetry applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5056PMHX/NOPB | LM5056 (non-A) variant with ±2.25% power accuracy and ±1.5% current accuracy; identical pinout and firmware interface. | Lower accuracy acceptable in cost-sensitive industrial monitoring where ±2% power error is tolerable. | Select LM5056PMHX/NOPB only when telemetry precision requirements are relaxed and legacy design reuse is prioritized. |
| MAX34451ETL+ | 16-bit ADC, wider 3 V–80 V VIN range, integrated EEPROM, but no remote diode sensing; uses different PMBus register map. | Preferred for ultra-high-accuracy data logging in test equipment; lacks integrated thermal sensing for compact LED systems. | Choose MAX34451ETL+ when 16-bit resolution and nonvolatile configuration storage outweigh need for on-chip temperature sensing. |
Compared with LM5056PMHX/NOPB, the LM5056APMHX/NOPB delivers tighter power and current accuracy for mission-critical telemetry; versus MAX34451ETL+, it trades resolution and EEPROM for integrated thermal sensing and simpler thermal layout in space-constrained LED or telecom modules.
Availability
LM5056APMHX/NOPB is available at Aetrix Electronics and suitable for server backplane systems, base station power distribution, and industrial telemetry gateways requiring stable component supply, long-term lifecycle support, and guaranteed PMBus interoperability.
Supply support for LM5056APMHX/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 over 50 years of innovation in high-reliability industrial and communications ICs.
The LM5056A product line was engineered specifically for intelligent power telemetry in high-voltage distributed systems, emphasizing PMBus-compliant real-time monitoring, black-box fault capture, and robust thermal sensing for telecom and industrial infrastructure.
FAQ
What is the primary function of the LM5056APMHX/NOPB in a power system?
The LM5056APMHX/NOPB serves as a high-voltage telemetry hub that continuously measures and reports input voltage (10–80 V), input current, input power, output voltage, auxiliary voltage, and remote temperature via PMBus. It enables real-time system health monitoring, fault logging, and thermal management in server, telecom, and industrial power architectures. Its black-box capture feature stores telemetry snapshots upon WARN/FAULT events, making LM5056APMHX/NOPB essential for diagnostics and reliability validation.
How does the LM5056APMHX/NOPB achieve ±1.75% input power accuracy?
The LM5056APMHX/NOPB achieves ±1.75% input power accuracy through simultaneous 12-bit sampling of VIN and IIN, eliminating time-skew errors inherent in sequential measurement. Its analog front-end uses matched gain paths and calibrated reference (2.97 V ±0.03 V) to ensure consistent scaling across operating temperature (–40°C to +125°C). This specification applies under defined conditions: VIN = 48 V, VIN_K–SENSE = 22 mV, CL = VDD, and TJ = 0°C to 85°C-verified per TI's SNVS827A datasheet for LM5056APMHX/NOPB.
Can the LM5056APMHX/NOPB monitor output voltage independently of input voltage?
Yes, the LM5056APMHX/NOPB monitors output voltage independently via the OUT pin (Pin 1), which accepts voltages up to 80 V and connects directly to the ADC multiplexer. This allows concurrent measurement of VIN (Pin 5) and VOUT (via OUT) without shared signal path interference. The device reports VOUT with ±1.0% accuracy across 0°C to 85°C, enabling dual-rail telemetry in systems with isolated DC-DC stages or redundant power feeds-confirmed in the Electrical Characteristics table of the LM5056APMHX/NOPB datasheet.
What is the role of the CL pin on the LM5056APMHX/NOPB?
The CL pin (Pin 22) on the LM5056APMHX/NOPB selects the full-scale current sense voltage range: connecting CL to VDD sets 27.0 mV FSR, while connecting CL to DGND sets 54.4 mV FSR. This hardware-selectable range optimizes ADC resolution for varying load currents-e.g., 27.0 mV suits high-current, low-RS designs, whereas 54.4 mV improves SNR for low-current, high-RS configurations. The setting is latched at power-up and can be overridden via PMBus DEVICE_SETUP (D9h) command, ensuring flexibility in both layout and runtime configuration for LM5056APMHX/NOPB.
Does the LM5056APMHX/NOPB require an external temperature sensor?
No, the LM5056APMHX/NOPB integrates a remote diode temperature sensing circuit and only requires an external NPN transistor (e.g., MMBT3904) connected to the DIODE pin (Pin 16) and AGND. The IC sources precise current steps (9.4 μA DC + 250 μA pulses) to measure junction voltage changes, computing temperature with ±2°C accuracy from 25°C to 85°C. No external ADC, biasing resistors, or calibration ICs are needed-this capability is intrinsic to LM5056APMHX/NOPB and documented in its Functional Description and Typical Characteristics sections.
LM5056APMHX/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
LM5056APMHX/NOPB FAQ
1.How can I place an order for LM5056APMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5056APMHX/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 LM5056APMHX/NOPB reliable?
The price and inventory of LM5056APMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5056APMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5056APMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5056APMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5056APMHX/NOPB?
LM5056APMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5056APMHX/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 LM5056APMHX/NOPB?
For technical support, including LM5056APMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5056APMHX/NOPB requirements.
6.How does Aetrix verify that LM5056APMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5056APMHX/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 LM5056APMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5056APMHX/NOPB?
All LM5056APMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5056APMHX/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 LM5056APMHX/NOPB part is unused and in its original packaging.
Return procedure for LM5056APMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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