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Texas Instruments LM5072MH-50/NOPB
- Part No.:
- LM5072MH-50/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5072MH-50/NOPB.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,366
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Product details
Overview
LM5072MH-50/NOPB from Texas Instruments is a fully IEEE 802.3af-compliant Powered Device (PD) interface and current-mode PWM controller with integrated 100V hot-swap MOSFET (RDS(ON) = 0.7 Ω), programmable DC current limit up to 800 mA, and 50% maximum duty cycle. It enables PoE-powered IP phones, wireless access points, and network cameras requiring auxiliary power support and robust inrush control.
For engineers reviewing the LM5072MH-50/NOPB datasheet, LM5072MH-50/NOPB pinout, LM5072MH-50/NOPB application, or LM5072MH-50/NOPB equivalent, key selection criteria include IEEE 802.3af compliance, 100V input rating, auxiliary power dominance configuration, thermal shutdown at 165°C, and TSSOP-16 EP package compatibility with PoE front-end design constraints.
Technical Context
The LM5072MH-50/NOPB integrates dual-domain control: a PD interface with signature resistor (24.5 kΩ), classification circuitry, UVLO (38 V release / 31 V lockout), and programmable inrush/DC current limits; and a peak-current-mode PWM controller with 100 V start-up regulator, 2% reference error amplifier, and gate driver capable of 800 mA peak sink/source. Its -50 suffix denotes fixed 50% max duty cycle without slope compensation.
It supports isolated and non-isolated topologies (flyback, forward, buck) via FB/COMP/CS pins, accepts auxiliary power via ICL_FAUX and RAUX pins with configurable dominance logic, and uses RTN–ARTN single-point grounding for noise immunity. The exposed pad enhances thermal dissipation with θJA = 40°C/W in TSSOP-16 EP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Rating | 9 V to 70 V operating; 100 V absolute max - enables use with transient suppressors rated for PoE surge events without derating. |
| PD Interface Compliance | Fully IEEE 802.3af compliant - includes integrated signature resistor (24.5 kΩ), classification capability, and UVLO with 7 V hysteresis. |
| Hot Swap MOSFET | 100 V, 0.7 Ω RDS(ON) - reduces conduction loss and simplifies external FET selection in PoE front-end stage. |
| PWM Max Duty Cycle | 47–53% (typ. 50%) - optimized for non-slope-compensated current-mode control in flyback converters with tight regulation. |
| DC Current Limit Range | Programmable 150–800 mA via DCCL pin - supports higher-power PoE applications beyond Class 4 (e.g., dual-rail systems). |
| Oscillator Frequency | 50–500 kHz programmable via RT pin - allows optimization of transformer size, efficiency, and EMI in compact PoE designs. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal layout in enclosed enclosures. |
Pinout & Package
TSSOP-16 EP (Exposed Pad) package with 0.65 mm pitch; exposed metal pad must be connected to VEE-referenced PCB plane for thermal performance.
| 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 size and loop stability. |
| 3 (VIN) | PoE positive input supply | Accepts 9–70 V PoE voltage after diode bridge; withstands 100 V transients; feeds PD interface and VCC regulator. |
| 4 (RCLASS) | PD classification current setting | External resistor sets IEEE 802.3af class (0–4); open = Class 0 (15.4 W PSE allocation); disabled during auxiliary operation. |
| 5 (ICL_FAUX) | Inrush limit / front auxiliary enable | Resistor-to-VEE programs inrush current (150–400 mA); high logic enables front auxiliary power dominance over PoE. |
| 6 (DCCL) | DC current limit programming | Resistor-to-VEE sets steady-state input current limit (150–800 mA); critical for cable drop management and thermal design. |
| 7 (VEE) | PoE negative return / auxiliary return | Common return path for PoE and front auxiliary inputs; connects to diode bridge cathode and PCB ground plane. |
| 8 (RTN) | PWM controller power return | Drain node of internal hot-swap MOSFET; must tie externally to ARTN at single point to minimize noise coupling into CS/FB. |
| 9 (OUT) | PWM gate driver output | 800 mA peak drive capability directly switches external N-channel MOSFET in flyback/forward/buck topologies. |
| 10 (VCC) | Internal bias regulator output | 7.7 V regulated supply for internal circuitry; powers gate driver and error amplifier; requires local 1 µF ceramic bypass. |
| 11 (nPGOOD) | Power Good indicator | Active-low open-drain signal confirms full capacitor charge and stable PoE interface; used to enable downstream rails or LEDs. |
| 12 (CS) | Current sense input | Monitors primary-side current via sense resistor; enables cycle-by-cycle limiting and peak-current-mode control stability. |
| 13 (RAUX) | Rear auxiliary power enable | Configures rear auxiliary source dominance; thresholds at 2.5 V (low) and 6.0 V (high); bypasses hot-swap MOSFET entirely. |
| 14 (FB) | Voltage feedback input | Inverting input of error amplifier; connects to optocoupler in isolated designs or resistive divider in non-isolated configurations. |
| 15 (COMP) | Error amplifier output | Compensation node for loop stability; interfaces with optocoupler secondary side in isolated flyback implementations. |
| 16 (ARTN) | PWM reference ground | Reference for FB, COMP, CS, RT, SS; must short to RTN at single point to prevent ground bounce in high-di/dt switching. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PD signature resistor | 24.5 kΩ ±5% - eliminates external component, ensures IEEE 802.3af detection compliance without calibration. |
| Programmable auxiliary dominance | Front (ICL_FAUX) or rear (RAUX) auxiliary priority - enables seamless failover to AC adapter or battery during PoE outage. |
| 100 V hot-swap MOSFET | 0.7 Ω RDS(ON) at 25°C - reduces front-end conduction loss by >30% vs discrete solutions, easing thermal design. |
| Peak-current-mode PWM control | Inherent line feed-forward and cycle-by-cycle current limiting - simplifies loop compensation and improves transient response. |
| Thermal shutdown with hysteresis | 165°C trip / 140°C recovery - prevents latch-up during overload while allowing safe restart after cooling in sealed enclosures. |
Applications
| IP Telephony Endpoint | Wireless Access Point |
|---|---|
|
Use Scenario: Desktop VoIP phone powered exclusively via Cat5e Ethernet cable in enterprise office environment. IC Role / Device Role / Timing Role: PD interface manages IEEE 802.3af detection/classification; PWM controller regulates 3.3 V/5 V rails for codec, Ethernet PHY, and display. Use Value: Eliminates wall adapter, reduces BOM count by 4 components (signature resistor, UVLO, current limit, hot-swap FET), and enables Class 2 (6.49 W) operation with <150 mW quiescent loss. |
Use Scenario: Dual-band 802.11ac access point deployed in ceiling-mounted enclosure with limited airflow. IC Role / Device Role / Timing Role: PD interface negotiates Class 4 power (12.95 W); PWM controller drives flyback converter delivering 12 V for RF PA and 3.3 V for SoC. Use Value: 50% max duty cycle prevents subharmonic oscillation in continuous-conduction-mode flyback; thermal shutdown protects against ambient +70°C derating. |
| Network Video Camera | Industrial PoE Switch Port |
|
Use Scenario: Outdoor PTZ camera with heater and IR illuminator drawing burst current up to 650 mA from PoE. IC Role / Device Role / Timing Role: DCCL pin programs 650 mA limit; RAUX pin enables battery backup during PoE interruption; nPGOOD signals MCU when stable rail is ready. Use Value: Programmable inrush (via ICL_FAUX) prevents cable voltage sag during cold start; 100 V rating accommodates 60 V transients per IEC 61000-4-5. |
Use Scenario: Managed industrial switch providing PoE+ to field devices with auxiliary 24 V DC input for redundancy. IC Role / Device Role / Timing Role: Front auxiliary mode (ICL_FAUX high) prioritizes 24 V DC over PoE; PD interface remains active for classification if PoE restored. Use Value: Seamless switchover with <10 µs delay; no firmware intervention required; maintains IEEE 802.3af signature during auxiliary operation. |
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 |
|---|---|---|---|
| LM5072MH-80/NOPB | 80% max duty cycle with built-in slope compensation; no soft-start current variation over temperature | Better suited for discontinuous-conduction-mode flyback or forward converters requiring >55% duty cycle | Select LM5072MH-80/NOPB only if topology demands >53% duty cycle; LM5072MH-50/NOPB avoids slope compensation complexity in standard flyback designs. |
| LT4275AIMSE#PBF | IEEE 802.3at (PoE+) compliant; 30 V max input; separate PD interface and PWM controller ICs | Supports up to 25.5 W input power; requires external PWM controller (e.g., LT3748) and more external components | Choose LT4275AIMSE#PBF only when PoE+ power level (>12.95 W) is mandatory; LM5072MH-50/NOPB offers lower BOM cost and smaller footprint for 802.3af applications. |
Compared with LM5072MH-80/NOPB and LT4275AIMSE#PBF, LM5072MH-50/NOPB delivers optimal integration and thermal efficiency for cost-sensitive 802.3af endpoints where 50% duty cycle suffices and 100 V surge tolerance is critical.
Availability
LM5072MH-50/NOPB is available at Aetrix Electronics and suitable for IP telephony endpoints, wireless access points, network video cameras, and industrial PoE switch ports requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM5072MH-50/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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, communications, and automotive markets.
The LM5072 product line delivers integrated PoE PD interface and PWM controllers targeting IEEE 802.3af-compliant endpoints needing minimal external components, auxiliary power flexibility, and robust thermal protection.
FAQ
What is the maximum input voltage the LM5072MH-50/NOPB can withstand?
The LM5072MH-50/NOPB has an absolute maximum input voltage rating of 100 V between VIN and VEE pins. This allows robust transient suppression design for PoE applications subject to IEC 61000-4-5 surges. Its operating range is specified from 9 V to 70 V, ensuring reliable startup at minimum PoE voltage (42 V) and continued operation down to 32 V under load.
How does the LM5072MH-50/NOPB handle auxiliary power sources?
The LM5072MH-50/NOPB supports two auxiliary power configurations: front auxiliary (enabled via ICL_FAUX pin) dominates PoE and routes through the internal hot-swap MOSFET; rear auxiliary (enabled via RAUX pin) bypasses the MOSFET entirely and connects directly to the DC-DC converter input. Both modes disable PD classification and maintain IEEE 802.3af signature only when PoE is active.
What is the purpose of the nPGOOD pin on the LM5072MH-50/NOPB?
The nPGOOD pin on the LM5072MH-50/NOPB is an active-low open-drain indicator that signals successful completion of the PoE inrush charging sequence. It asserts low when the hot-swap MOSFET's VDS drops below 1.5 V (with 1 V hysteresis) and VGS exceeds 5 V, confirming stable input capacitance charge and enabling downstream circuitry or status LEDs.
Can the LM5072MH-50/NOPB be used in isolated flyback designs?
Yes, the LM5072MH-50/NOPB supports isolated flyback topologies via its FB and COMP pins. Connect FB to the optocoupler cathode on the secondary side and tie COMP to the optocoupler emitter; the internal error amplifier remains disabled (via ARTN connection) while secondary-side regulation controls COMP voltage directly.
What thermal considerations apply to the LM5072MH-50/NOPB at 800 mA DC current limit?
At 800 mA DC current limit, the LM5072MH-50/NOPB dissipates significant power in its internal hot-swap MOSFET (P ≈ I² × RDS(ON) = 0.64 A² × 0.7 Ω ≈ 0.28 W). With θJA = 40°C/W, this raises junction temperature by ~11°C above ambient. Use the exposed pad tied to a ≥2 cm² copper pour on inner layer 2 to maintain TJ ≤ 125°C at 70°C ambient.
LM5072MH-50/NOPB 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-50/NOPB FAQ
1.How can I place an order for LM5072MH-50/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5072MH-50/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 LM5072MH-50/NOPB reliable?
The price and inventory of LM5072MH-50/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5072MH-50/NOPB is usually 5 days.
3.What payment methods are accepted for LM5072MH-50/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5072MH-50/NOPB transactions.
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4.How is shipping managed for LM5072MH-50/NOPB?
LM5072MH-50/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5072MH-50/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 LM5072MH-50/NOPB?
For technical support, including LM5072MH-50/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5072MH-50/NOPB requirements.
6.How does Aetrix verify that LM5072MH-50/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5072MH-50/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 LM5072MH-50/NOPB meets industry standards.
7.What is the process for return or replacement of LM5072MH-50/NOPB?
All LM5072MH-50/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5072MH-50/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 LM5072MH-50/NOPB part is unused and in its original packaging.
Return procedure for LM5072MH-50/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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