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Texas Instruments LM5072MHX-80/NOPB
- Part No.:
- LM5072MHX-80/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5072MHX-80/NOPB.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM5072MHX-80/NOPB 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), and enables PoE-powered IP phones, wireless access points, and networked surveillance cameras.
For engineers reviewing the LM5072MHX-80/NOPB datasheet, LM5072MHX-80/NOPB pinout, LM5072MHX-80/NOPB application, or LM5072MHX-80/NOPB equivalent, this device serves as a complete PoE PD front-end with programmable inrush/DC current limits, integrated signature resistor, and auxiliary power prioritization-critical for robust Ethernet-powered system design.
Technical Context
The LM5072MHX-80/NOPB implements dual-path power management: its PD interface handles IEEE 802.3af detection (1.5–10 V), classification (12–23.5 V), UVLO (38 V rise / 31 V fall), and hot-swap control with 0.7 Ω internal MOSFET; simultaneously, its peak-current-mode PWM controller operates at 50–500 kHz, includes slope compensation, 2% reference error amplifier, and 800 mA gate drive for flyback/forward/buck topologies.
It supports three power sources-PoE (VIN–VEE), front auxiliary (ICL_FAUX-enabled), and rear auxiliary (RAUX-enabled)-with programmable dominance logic; auxiliary inputs bypass or override PoE UVLO, enabling seamless fallback during PoE interruption while maintaining regulated output via the same PWM stage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 100 V - Enables use of lower-cost transient voltage suppressors and accommodates worst-case PoE cable surge transients without external clamping. |
| Duty Cycle Limit | 80% - Supports higher output voltage ratios in flyback converters and improves efficiency in low-input-voltage PoE+ edge cases. |
| Hot Swap RDS(ON) | 0.7 Ω - Reduces conduction loss and thermal stress during sustained 400 mA PoE operation; eliminates need for external high-voltage MOSFET. |
| Signature Resistance | 24.5 kΩ - Integrated IEEE 802.3af-compliant detection impedance; no external resistor required for basic Class 0 operation. |
| Oscillator Range | 50–500 kHz - Programmable via RT pin; allows optimization of transformer size, EMI filtering, and efficiency trade-offs across topologies. |
| Current Sense Threshold | 0.5 V - Fixed cycle-by-cycle current limit reference; ensures consistent overcurrent protection independent of temperature or supply variation. |
| Thermal Shutdown | 165 °C - Protects against latch-up during overload or poor PCB heatsinking; 25 °C hysteresis prevents oscillation near trip point. |
Pinout & Package
TSSOP-16 EP (Exposed Pad); RoHS-compliant, thermally enhanced package with 40 °C/W junction-to-ambient thermal resistance. Exposed pad must be connected to VEE plane for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RT | Oscillator frequency programming | Connects to resistor-to-ground to set switching frequency between 50–500 kHz; determines transformer core size and EMI filter requirements. |
| 2 SS | Soft-start timing | Sinks 10 µA current to capacitor; controls ramp rate of PWM output to prevent inrush into downstream converter capacitors. |
| 3 VIN | PoE positive input | Accepts 9–70 V PoE or auxiliary input; rated to 100 V absolute max; connects directly to hot-swap MOSFET drain. |
| 4 RCLASS | Classification current setting | Programs IEEE 802.3af power class (0–4) via resistor to VEE; open = Class 0 (12.95 W at PD input). |
| 5 ICL_FAUX | Front auxiliary enable / inrush limit | Enables front auxiliary power path when >8.7 V; also programs inrush current limit (150–400 mA) via resistor to VEE. |
| 6 DCCL | DC current limit programming | Sets steady-state PoE input current limit (150–800 mA) via resistor to VEE; critical for thermal management and PSE allocation. |
| 7 VEE | PoE/auxiliary return | Common return for PoE input, front auxiliary, and hot-swap MOSFET source; must tie to system ground at single point. |
| 8 RTN | PWM controller return | Drain reference for hot-swap MOSFET; connects to primary-side ground of isolated DC-DC converter; ties externally to ARTN. |
| 9 OUT | PWM gate driver output | 800 mA peak sink/source capability; drives N-channel MOSFET gate directly; requires external bootstrap or level-shift for high-side drive. |
| 10 VCC | Internal bias regulator output | 7.7 V regulated supply for internal circuitry; powers gate driver and error amp; limited to 15 mA load. |
| 11 nPGOOD | Power Good indicator | Active-low open-drain signal asserts after hot-swap completes and VGS > 5 V / VDS < 1.5 V; used to enable downstream regulators or status LEDs. |
| 12 CS | Current sense input | Accepts 0.5 V threshold signal from sense resistor; enables cycle-by-cycle overcurrent protection and slope compensation. |
| 13 RAUX | Rear auxiliary enable | Enables rear auxiliary path when >6.0 V; allows auxiliary power to dominate PoE without passing through hot-swap MOSFET. |
| 14 FB | Voltage feedback input | Inverting input of error amplifier; connects to resistive divider on output; disables amplifier when shorted to ARTN in isolated designs. |
| 15 COMP | Error amplifier output | Drives PWM comparator; interfaces with optocoupler in isolated flyback; sinks up to 10 mA for secondary-side compensation. |
| 16 ARTN | Analog reference ground | Reference node for FB, COMP, CS, RT, SS; must be shorted to RTN at single point to minimize noise coupling into control loop. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated IEEE 802.3af PD interface | Eliminates 12+ external components for detection, classification, UVLO, and signature-reducing BOM count and layout area by >40% vs discrete solutions. |
| Programmable dual-current limiting | Separate inrush (150–400 mA) and DC (150–800 mA) limits allow precise control of startup surge and steady-state PoE draw-ensuring PSE compatibility and thermal safety. |
| Auxiliary power prioritization | Front/rear auxiliary enable pins (ICL_FAUX/RAUX) let designers define priority hierarchy between PoE and AC adapter/solar input-enabling failover without firmware or external logic. |
| 80% max duty cycle with slope compensation | Enables higher step-up ratios in flyback converters and stabilizes current-mode control at high duty cycles-critical for 48 V PoE to 12 V/5 V conversion. |
| 100 V hot-swap MOSFET with 0.7 Ω RDS(ON) | Reduces conduction loss by ~3× vs typical 1.8 Ω alternatives at 400 mA, lowering junction temperature rise by 15–20 °C under full load. |
Applications
| IP Telephony Endpoint | Wireless Access Point |
|---|---|
|
Use Scenario: Desktop VoIP phone powered exclusively via Category 5e Ethernet cable in enterprise office environment. IC Role / Device Role / Timing Role: PD interface manages IEEE 802.3af handshake and hot-swap sequencing; PWM controller regulates 5 V/2 A output for codec, DSP, and Ethernet PHY. Use Value: Eliminates wall adapter, reduces cabling clutter, and ensures reliable startup even with 100 m cable length and 8 V drop. |
Use Scenario: Dual-band 802.11ac access point mounted in ceiling plenum with constrained airflow and no local AC outlet. IC Role / Device Role / Timing Role: Provides PoE input conditioning and synchronous flyback regulation delivering 12 V/1.5 A to RF power amps and baseband ICs. Use Value: 80% duty cycle enables efficient 48 V-to-12 V conversion; thermal shutdown protects against enclosure overheating during sustained transmit bursts. |
| Networked Surveillance Camera | Industrial IoT Gateway |
|
Use Scenario: Outdoor PTZ camera with heater and IR illuminator requiring >10 W PoE power and auxiliary 24 V DC backup. IC Role / Device Role / Timing Role: RAUX pin enables automatic switchover to 24 V auxiliary when PoE fails; PD interface maintains Class 4 (25.5 W) classification for heater operation. Use Value: Seamless power source transition avoids video dropout; programmable DC current limit prevents PSE overload during heater activation. |
Use Scenario: DIN-rail mounted gateway aggregating Modbus, CAN, and LoRaWAN sensors in factory automation setting. IC Role / Device Role / Timing Role: Accepts PoE for primary power but uses ICL_FAUX to prioritize 24 V industrial rail supply; PWM controller feeds isolated buck converters for multiple domain supplies. Use Value: Auxiliary dominance ensures continuous operation during PoE maintenance windows; 100 V rating withstands factory-level transients on shared Ethernet infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device interface and PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5071MHX/NOPB | 50% max duty cycle, no internal slope compensation, no RAUX pin; identical PD interface and pinout. | Limited to lower-voltage-output converters (e.g., 48 V-to-3.3 V buck); unsuitable for flyback designs requiring >50% duty cycle. | Select LM5071MHX/NOPB only when strict 50% duty cycle is required for stability or when slope compensation is implemented externally. |
| LT4275AIMSE#TRPBF | IEEE 802.3at (PoE+) compliant, 30 V max input, no integrated PWM controller, requires external DC-DC controller. | Supports up to 25.5 W input power but mandates separate PWM IC and gate driver; increases component count and layout complexity. | Choose LT4275AIMSE#TRPBF when upgrading to PoE+ power levels and existing design already uses a compatible external controller. |
Compared with LM5072MHX-80/NOPB, LM5071MHX/NOPB trades duty-cycle headroom for simpler control in low-ratio applications, while LT4275AIMSE#TRPBF sacrifices integration for higher PoE power class compliance-making LM5072MHX-80/NOPB optimal for cost-sensitive, space-constrained 802.3af systems needing embedded PWM control.
Availability
LM5072MHX-80/NOPB is available at Aetrix Electronics and suitable for IP telephony endpoints, wireless access points, networked surveillance cameras, industrial IoT gateways, and PoE-powered digital signage requiring stable component supply across multi-year production cycles.
Supply support for LM5072MHX-80/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 connectivity technologies, with decades of leadership in power management ICs and industrial-grade reliability.
The LM5072 product line delivers fully integrated Power over Ethernet Powered Device interfaces with embedded PWM controllers, designed specifically for space-constrained, cost-sensitive Ethernet-powered equipment requiring robust PoE handshaking and efficient DC-DC conversion.
FAQ
What is the maximum PoE input current supported by the LM5072MHX-80/NOPB?
The LM5072MHX-80/NOPB supports a programmable DC current limit up to 800 mA via the DCCL pin. This exceeds the IEEE 802.3af maximum of 400 mA, enabling higher-power implementations such as Class 4 devices or auxiliary-assisted operation. The actual usable current depends on thermal design, PCB copper area, and ambient temperature-TI recommends limiting sustained current to ≤400 mA without additional heatsinking.
Does the LM5072MHX-80/NOPB require external components for IEEE 802.3af detection and classification?
No. The LM5072MHX-80/NOPB integrates the 24.5 kΩ signature resistor for detection and provides a dedicated RCLASS pin for classification current programming using a single external resistor. For Class 0 operation, RCLASS is left open. No external diodes, FETs, or UVLO comparators are needed-the entire PD interface is self-contained within the LM5072MHX-80/NOPB.
How does the LM5072MHX-80/NOPB handle power source priority between PoE and auxiliary inputs?
The LM5072MHX-80/NOPB uses two dedicated pins: ICL_FAUX enables front auxiliary power (which passes through the hot-swap MOSFET), and RAUX enables rear auxiliary power (which bypasses the MOSFET). When either pin exceeds its threshold voltage (8.7 V for ICL_FAUX, 6.0 V for RAUX), the device automatically disables PoE operation and transitions to auxiliary mode-ensuring uninterrupted power without external supervision or firmware intervention.
Can the LM5072MHX-80/NOPB be used in isolated flyback topologies?
Yes. The LM5072MHX-80/NOPB supports isolated designs via its FB and COMP pins: FB is tied to ARTN to disable the internal error amplifier, and COMP is driven by a secondary-side optocoupler feedback network. The 80% duty cycle and built-in slope compensation ensure stable operation across wide input/output voltage ranges typical of flyback converters in PoE applications.
What thermal considerations apply to the LM5072MHX-80/NOPB in continuous 400 mA PoE operation?
At 400 mA input current and 48 V PoE input, the LM5072MHX-80/NOPB dissipates approximately 1.1 W in the hot-swap MOSFET (0.7 Ω × 0.4²). With θJA = 40 °C/W and 25 °C ambient, junction temperature rises ~44 °C-well below the 125 °C max operating limit. However, TI recommends connecting the exposed pad to a ≥1 cm² VEE copper pour and using ≥2 oz copper for sustained 400 mA operation above 60 °C ambient.
LM5072MHX-80/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LM5072MHX-80/NOPB FAQ
1.How can I place an order for LM5072MHX-80/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5072MHX-80/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 LM5072MHX-80/NOPB reliable?
The price and inventory of LM5072MHX-80/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5072MHX-80/NOPB is usually 5 days.
3.What payment methods are accepted for LM5072MHX-80/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5072MHX-80/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5072MHX-80/NOPB?
LM5072MHX-80/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5072MHX-80/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 LM5072MHX-80/NOPB?
For technical support, including LM5072MHX-80/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5072MHX-80/NOPB requirements.
6.How does Aetrix verify that LM5072MHX-80/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5072MHX-80/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 LM5072MHX-80/NOPB meets industry standards.
7.What is the process for return or replacement of LM5072MHX-80/NOPB?
All LM5072MHX-80/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5072MHX-80/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 LM5072MHX-80/NOPB part is unused and in its original packaging.
Return procedure for LM5072MHX-80/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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