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Texas Instruments LM5072MH-80
- Part No.:
- LM5072MH-80
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5072MH-80.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,685
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Product details
Overview
LM5072MH-80 from Texas Instruments is an integrated IEEE 802.3af-compliant Powered Device (PD) interface and current-mode PWM controller in a single TSSOP-16 EP package. It delivers up to 80% maximum duty cycle, supports 9–70V auxiliary input, features a 100V-rated hot-swap MOSFET (RDS(ON) = 0.7 Ω), programmable DC current limit up to 800 mA, and enables PoE-powered IP phones, wireless access points, and network cameras.
For engineers reviewing the LM5072MH-80 datasheet, LM5072MH-80 pinout, LM5072MH-80 application, or LM5072MH-80 equivalent, this page provides verified technical context, real-world design meanings for key specs, validated pin functions, confirmed alternative options, and supply support details specific to the -80 suffix variant.
Technical Context
The LM5072MH-80 implements a peak-current-mode PWM controller with built-in slope compensation, enabling stable operation in flyback, forward, and buck topologies. Its 100V start-up regulator powers the internal circuitry, while the error amplifier (2% reference, 67 dB DC gain) interfaces with isolated feedback via COMP/ARTN/RAUX paths.
Its PD interface integrates signature resistor (24.5 kΩ), classification logic (Class 0–4), UVLO (38 V rise / 31 V fall), thermal shutdown (165°C), and dual auxiliary power enable (ICL_FAUX and RAUX). The hot-swap MOSFET operates with programmable inrush (150–400 mA) and DC current limits (150–800 mA), all referenced to VEE/RTN/ARTN ground topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Duty Cycle | 80% - Enables higher output voltage ratio in flyback converters without external slope compensation. |
| Hot-Swap MOSFET RDS(ON) | 0.7 Ω - Reduces conduction loss and thermal stress during PoE startup and sustained operation. |
| Input Voltage Range | 9–70 V - Supports full IEEE 802.3af PoE (36–57 V) plus wide-range auxiliary inputs (e.g., 12 V AC adapter). |
| DC Current Limit Range | 150–800 mA - Programmable via DCCL pin resistor to match system power budget and cable loss constraints. |
| Oscillator Frequency | 50–500 kHz - Adjustable via RT pin; typical 250 kHz at RT = 26.1 kΩ for optimal EMI and transformer size trade-off. |
| Thermal Shutdown | 165°C with 25°C hysteresis - Prevents latch-up during overload or poor PCB heatsinking; exposed pad improves θJA to 40°C/W. |
| Power Good Threshold | VDS < 1.5 V + VGS > 5 V - Ensures stable input capacitor charge before enabling PWM, avoiding premature converter startup. |
Pinout & Package
TSSOP-16 EP (Exposed Pad); RoHS-compliant, thermally enhanced package with 0.65 mm pitch. Exposed pad must be connected to VEE plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RT | Oscillator frequency programming | Connects to resistor-to-ground to set switching frequency; determines loop bandwidth and transformer sizing. |
| 2 SS | Soft-start timing | Charges external capacitor to ramp COMP voltage, preventing output overshoot during startup. |
| 3 VIN | PoE/auxiliary positive input | Accepts up to 100 V; feeds PD interface and start-up regulator; withstands Ethernet cable transients. |
| 4 RCLASS | PD classification current setting | Resistor-to-VEE sets IEEE 802.3af Class 0–4; open = Class 0 (max PSE allocation). |
| 5 ICL_FAUX | Inrush limit & front auxiliary enable | Resistor-to-VEE programs inrush (150–400 mA); high = enable front auxiliary power dominance. |
| 6 DCCL | DC current limit programming | Resistor-to-VEE sets steady-state current limit (150–800 mA); critical for PoE cable IR drop margin. |
| 7 VEE | PoE/auxiliary return path | Common return for PD interface; connects to diode bridge cathodes and exposed pad ground plane. |
| 8 RTN | PWM controller return | Drain node of internal hot-swap MOSFET; must tie externally to VEE/ARTN at single-point ground. |
| 9 OUT | PWM gate driver output | 800 mA peak sink/source drives external N-channel MOSFET; low saturation ensures efficient switching. |
| 10 VCC | Internal bias regulator output | 7.7 V regulated supply for internal logic; max 15 mA load; UVLO protects against brownout. |
| 11 nPGOOD | Power good indicator | Open-drain active-low signal confirms stable input charge and enables downstream sequencing. |
| 12 CS | Current sense input | Monitors primary-side current for cycle-by-cycle limiting; 0.5 V threshold with 65 ns blanking. |
| 13 RAUX | Rear auxiliary power enable | Configures rear auxiliary source dominance; thresholds at 2.5 V (low) and 6.0 V (high) for robust detection. |
| 14 FB | Voltage feedback input | Inverting input of error amplifier; ties to ARTN in isolated designs to disable local regulation. |
| 15 COMP | Error amplifier output | Drives PWM comparator; interfaces with optocoupler in isolated flyback for secondary-side regulation. |
| 16 ARTN | Reference ground | Internal analog ground; must short to RTN externally to minimize noise coupling into FB/COMP. |
| EP | Exposed thermal pad | Internally connected to VEE; soldered to large copper pour for thermal dissipation (θJA = 40°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 802.3af PD compliance | Fully integrated signature (24.5 kΩ), classification, UVLO, and thermal protection-no external ICs required. |
| 80% max duty cycle with slope compensation | Enables high-voltage-ratio flyback designs without external compensation networks or instability risk. |
| Dual auxiliary power support | Front (ICL_FAUX) and rear (RAUX) auxiliary inputs allow seamless switchover between PoE and AC adapters. |
| Programmable inrush & DC current limits | Two independent resistor-programmed limits prevent cable overcurrent and ensure IEEE 802.3af startup reliability. |
| 100V-rated hot-swap MOSFET | Eliminates need for external high-voltage MOSFET and associated gate drive complexity in PoE front-end. |
| Isolated/non-isolated topology support | FB/COMP/ARTN architecture supports both direct-feedback buck and optocoupler-coupled flyback designs. |
Applications
| IP Telephony Endpoint | Wireless Access Point |
|---|---|
|
Use Scenario: Desktop VoIP phone powered via CAT5e Ethernet with local 12 V AC adapter fallback. IC Role / Device Role / Timing Role: LM5072MH-80 acts as PoE PD interface and primary DC-DC controller, managing power handoff between PoE and auxiliary sources. Use Value: Eliminates redundant power supplies; maintains call continuity during PoE interruption using RAUX-triggered auxiliary switchover. |
Use Scenario: Dual-band 802.11ac AP deployed in ceiling-mounted enclosure with limited airflow. IC Role / Device Role / Timing Role: LM5072MH-80 provides PoE input conditioning, inrush control, and flyback regulation for 5 V/3.3 V rails. Use Value: 80% duty cycle enables compact transformer design; thermal shutdown prevents field failures in confined spaces. |
| Network Surveillance Camera | Industrial IoT Gateway |
|
Use Scenario: Outdoor PTZ camera with heater and IR illuminator drawing >12 W under PoE+ extension. IC Role / Device Role / Timing Role: LM5072MH-80 serves as high-current PD interface (800 mA DC limit) and synchronous buck controller for 12 V imaging rail. Use Value: 0.7 Ω RDS(ON) minimizes heat generation at full load; programmable DCCL ensures compliance with extended-power PoE budgets. |
Use Scenario: DIN-rail mounted gateway aggregating Modbus, CAN, and cellular data in factory environment. IC Role / Device Role / Timing Role: LM5072MH-80 delivers robust PoE input stage with UVLO hysteresis and auxiliary backup for continuous uptime. Use Value: Dual auxiliary enable (ICL_FAUX + RAUX) allows flexible integration of 24 V DC industrial supply alongside PoE. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface and PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5071MH-80 | No integrated PD signature resistor; requires external 24.5 kΩ; same 80% duty cycle and auxiliary support. | Lacks full IEEE 802.3af compliance out-of-box; suitable only where signature resistor can be added externally. | Select LM5071MH-80 only if board space permits external signature resistor and classification is not required. |
| LT4275AIMSE#PBF | IEEE 802.3at/af-compliant PD interface only; no integrated PWM controller-requires external DC-DC IC. | Used with discrete flyback/buck controllers; supports higher power (30 W) but increases BOM count and layout complexity. | Choose LT4275AIMSE#PBF when upgrading to PoE+ or when existing PWM controller architecture must be retained. |
Compared with LM5072MH-80, LM5071MH-80 reduces integration by removing the signature resistor, while LT4275AIMSE#PBF decouples PD interface from power conversion-both increase component count and design effort versus the single-chip solution.
Availability
LM5072MH-80 is available at Aetrix Electronics and suitable for IP telephony endpoints, wireless access points, network surveillance cameras, and industrial IoT gateways requiring stable component supply across production lifecycles.
Supply support for LM5072MH-80 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The LM5072 product line targets IEEE 802.3af PoE-powered devices needing integrated PD interface and DC-DC control in minimal footprint-designed for networking, security, and communications infrastructure.
FAQ
What is the maximum duty cycle supported by LM5072MH-80?
The LM5072MH-80 supports a maximum duty cycle of 80%, with built-in slope compensation to maintain stability in high-duty-ratio flyback topologies. This is confirmed in the Electrical Characteristics table (Max Duty Cycle (-80 Device): 75–85%) and block diagram labeling. Unlike the -50 variant, the -80 suffix guarantees slope compensation is enabled, making it suitable for applications requiring >50% conduction time per cycle.
Does LM5072MH-80 include an integrated PD signature resistor?
Yes, LM5072MH-80 integrates a 24.5 kΩ signature resistor between VIN and RCLASS pins, fully compliant with IEEE 802.3af detection requirements (23.25–26 kΩ range). This eliminates the need for external components during signature mode, and the resistor is automatically disengaged after detection to reduce power loss-verified in the "Detection Signature" section and Figure 17 of the datasheet.
How is auxiliary power prioritized in LM5072MH-80?
LM5072MH-80 supports two auxiliary modes: front auxiliary (via ICL_FAUX pin) and rear auxiliary (via RAUX pin). Front auxiliary dominates PoE when ICL_FAUX is pulled high; rear auxiliary bypasses the hot-swap MOSFET entirely and connects directly to the DC-DC input. RAUX thresholds (2.5 V low / 6.0 V high) provide noise-immune selection-detailed in the "Auxiliary Power Option" electrical characteristics and RAUX description.
What is the purpose of the ARTN pin in LM5072MH-80?
The ARTN pin is the internal analog reference ground for the error amplifier, COMP, FB, and CS circuits. It must be shorted externally to RTN at a single point to minimize ground noise coupling-critical for stable regulation in isolated flyback designs. This requirement is explicitly stated in the PIN DESCRIPTIONS table and reinforced in Figure 15's PWM block diagram.
Can LM5072MH-80 operate with input voltages below 36 V?
Yes, LM5072MH-80 supports auxiliary input down to 9 V, independent of PoE UVLO thresholds. While its PoE UVLO releases at 38 V (rising), the auxiliary enable pins (ICL_FAUX and RAUX) allow operation from 9–70 V sources-confirmed in Operating Ratings and the "Auxiliary Power Option" section. This enables reliable function with 12 V AC adapters or battery backups even when PoE is absent or degraded.
LM5072MH-80 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 12.95 W
- Internal Switch(s):
- Both
- Auxiliary Sense:
- Yes
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 9V ~ 70V
- Current - Supply:
- 2mA (Max)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM5072MH-80 FAQ
1.How can I place an order for LM5072MH-80 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5072MH-80 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 LM5072MH-80 reliable?
The price and inventory of LM5072MH-80 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5072MH-80 is usually 5 days.
3.What payment methods are accepted for LM5072MH-80?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5072MH-80 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5072MH-80?
LM5072MH-80 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5072MH-80 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 LM5072MH-80?
For technical support, including LM5072MH-80 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5072MH-80 requirements.
6.How does Aetrix verify that LM5072MH-80 is sourced from the original manufacturer or authorized distributors?
All LM5072MH-80 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 LM5072MH-80 meets industry standards.
7.What is the process for return or replacement of LM5072MH-80?
All LM5072MH-80 units undergo pre-shipment inspection (PSI). If there is an issue with LM5072MH-80, 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 LM5072MH-80 part is unused and in its original packaging.
Return procedure for LM5072MH-80:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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