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Texas Instruments LM5070MTCX-50/NOPB
- Part No.:
- LM5070MTCX-50/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5070MTCX-50/NOPB.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM5070MTCX-50/NOPB from Texas Instruments is an IEEE 802.3af-compliant Power over Ethernet (PoE) Powered Device (PD) interface and current-mode PWM controller with integrated 80 V, 400 mA MOSFET, 50% maximum duty cycle limit, programmable inrush current limit (75–390 mA), and UVLO with 2.00 V threshold. It enables single-output flyback or forward converters in PoE-powered IP phones, wireless access points, and network cameras.
For engineers reviewing the LM5070MTCX-50/NOPB datasheet, LM5070MTCX-50/NOPB pinout, LM5070MTCX-50/NOPB application, or LM5070MTCX-50/NOPB equivalent, key selection criteria include IEEE 802.3af signature/classification compliance, 50% duty cycle limitation (no slope compensation), TSSOP-16 package thermal performance (θJA = 125°C/W), and integrated inrush current programming via RCLP.
Technical Context
The LM5070MTCX-50/NOPB implements a two-stage power sequencing architecture: first, a controlled inrush phase using its internal 80 V/400 mA MOSFET with programmable current limit (via RCLP), then automatic handoff to a current-mode PWM controller once RTN falls below 1.5 V relative to VEE. Its oscillator operates at twice the output frequency (e.g., 400 kHz internal for 200 kHz OUT) due to an on-chip divide-by-two circuit enabling precise 50% duty cycle enforcement.
Unlike the -80 variant, the -50 suffix device omits slope compensation and uses fixed 50% max duty cycle - making it suitable for non-isolated buck-derived topologies or isolated flyback designs where duty cycle remains ≤50%. The error amplifier (1.25 V reference, 75 dB DC gain) supports both isolated (optocoupler-coupled COMP) and non-isolated (direct FB feedback) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3af detection, classification, and inrush timing requirements. |
| Max Duty Cycle | 50% enforced by internal divide-by-two oscillator - no slope compensation required. |
| Inrush Current Limit | Programmable 75–390 mA via external RCLP resistor; defaults to 390 mA if open. |
| UVLO Threshold | 2.00 V nominal at UVLO pin; hysteresis set by 10 µA internal current source. |
| Oscillator Frequency | 175–225 kHz (OUT pin); internal oscillator runs at 350–450 kHz for -50 variant. |
| Current Sense Threshold | 0.5 V at CS pin triggers cycle-by-cycle current limiting with 55 ns leading-edge blanking. |
| Thermal Shutdown | Activates at 165°C junction temperature with 25°C hysteresis; θJA = 125°C/W (TSSOP-16). |
Pinout & Package
LM5070MTCX-50/NOPB is housed in a 16-pin TSSOP package (Package Code: PW) with exposed pad connected to VEE for thermal management. Pin pitch is 0.65 mm; body dimensions are 5.0 mm × 4.4 mm × 1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side input | Accepts PoE line voltage up to 75 V; diode-OR'd input for polarity insensitivity. |
| RSIG | Detection signature node | Connects 25 kΩ resistor to VIN for 23.75–26.25 kΩ signature impedance per IEEE 802.3af. |
| RCLASS | Classification current sink | Sinks programmable current (0–44 mA) to set IEEE 802.3af Class 0–4 via external resistor to VEE. |
| UVLO | UVLO sense input | Monitors resistor divider from VIN to UVLORTN; 2.00 V threshold enables/disables full operation. |
| RCLP | Inrush current programming | Resistor value sets initial charging current (75–390 mA); open = 390 mA default. |
| VEE | Negative supply return | System low-potential input; tied to RJ45 connector negative and PSE –48 V return. |
| RTN | SMPS return path | Drain of internal MOSFET; connects VEE to dc-dc converter return during inrush. |
| OUT | PWM gate driver output | 800 mA peak sink capability drives external MOSFET gate in flyback/forward topologies. |
| VCC | Internal bias regulator output | 7.8 V regulated output powers internal circuitry; UVLO falling threshold = 6.25 V. |
| FB | Error amplifier inverting input | 1.25 V internal reference; used for output voltage regulation in non-isolated designs. |
| COMP | Error amplifier output | Open-drain output with 5 kΩ internal pull-up; interfaces optocoupler in isolated SMPS. |
| CS | Current sense input | 0.5 V threshold triggers cycle-by-cycle limiting; 55 ns blanking suppresses switching noise. |
| RT / SYNC | Oscillator timing/sync input | Resistor sets frequency; accepts ac-coupled sync pulses >3.7 V peak for external clock alignment. |
| SS | Soft-start ramp control | 10 µA internal current charges external capacitor to control PWM startup ramp rate. |
| ARTN | Analog ground reference | Return for sensitive analog blocks (error amp, CS, RT); separate from high-current RTN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PoE PD interface | Combines signature detection, classification, inrush control, and UVLO in one IC - eliminates discrete interface components. |
| 50% max duty cycle enforcement | Hardware-limited output ensures safe operation in topologies requiring strict duty cycle control without slope compensation. |
| Programmable inrush current | External RCLP resistor allows tuning of initial capacitor charge current to match legacy PSE capabilities or reduce stress. |
| Automatic power sequencing | No external logic needed: MOSFET inrush stage hands off to PWM controller when RTN drops below 1.5 V relative to VEE. |
| Thermal shutdown with hysteresis | 165°C trip point and 25°C hysteresis prevent thermal runaway while allowing recovery after transient overload. |
Applications
| IP Telephony Endpoint | Wireless Access Point |
|---|---|
Use Scenario: Desktop VoIP phone powered exclusively via Cat5e Ethernet cable with centralized PoE switch. IC Role / Device Role / Timing Role: LM5070MTCX-50/NOPB performs IEEE 802.3af signature detection, Class 2 classification, and controlled inrush into a 3.3 V/5 V flyback converter. Use Value: Enables single-cable deployment with guaranteed interoperability, eliminating local AC adapters and reducing BOM count by integrating interface + controller. | Use Scenario: Indoor 802.11ac access point mounted on ceiling, drawing power from midspan PoE injector. IC Role / Device Role / Timing Role: LM5070MTCX-50/NOPB manages hot-plug sequencing, provides 50% duty cycle–limited PWM drive for dual-output forward converter (5 V + 12 V). Use Value: Ensures reliable startup under variable PSE load conditions and prevents duty cycle instability in high-voltage input scenarios. |
| Network Video Camera | IoT Edge Gateway |
Use Scenario: Outdoor PTZ camera with heater and IR illuminators, powered over long Ethernet runs (>75 m). IC Role / Device Role / Timing Role: LM5070MTCX-50/NOPB executes detection/classification, then delivers regulated 12 V to motor drivers and 3.3 V to image sensor via coupled inductor design. Use Value: Programmable RCLP resistor accommodates voltage drop on long cables by lowering inrush current to avoid PSE foldback. | Use Scenario: Industrial IoT gateway aggregating Modbus, BLE, and cellular data, deployed in factory Ethernet infrastructure. IC Role / Device Role / Timing Role: LM5070MTCX-50/NOPB serves as primary PoE interface and PWM controller for isolated 5 V/3.3 V buck-boost converter powering MCU and radio subsystems. Use Value: Integrated UVLO with programmable hysteresis ensures clean brownout recovery during factory power fluctuations without external supervisors. |
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 |
|---|---|---|---|
| LM5070MTCX-80/NOPB | 80% max duty cycle with slope compensation; internal oscillator matches OUT frequency. | Better suited for high-duty-cycle flyback designs requiring >50% conduction; higher peak current capability. | Select when topology demands >50% duty cycle or slope compensation is required for stability. |
| LT4275AIMSE#TRPBF | IEEE 802.3at (PoE+) compliant; supports up to 25.5 W; includes auxiliary power detection and digital classification. | Enables higher-power applications (e.g., pan-tilt-zoom cameras with heaters) and offers I²C configuration. | Choose for PoE+ systems or when programmable classification and fault reporting via I²C are required. |
Compared with LM5070MTCX-80/NOPB, the LM5070MTCX-50/NOPB trades duty cycle flexibility for deterministic 50% limit and simpler loop compensation; versus LT4275, it offers lower cost and smaller footprint but lacks PoE+ support and digital interface.
Availability
LM5070MTCX-50/NOPB is available at Aetrix Electronics and suitable for IP telephony endpoints, wireless access points, network video cameras, and industrial IoT gateways requiring stable component supply across multi-year production cycles.
Supply support for LM5070MTCX-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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM5070 product line was designed specifically for IEEE 802.3af-compliant Powered Devices, integrating PoE interface logic and current-mode PWM control to simplify single-chip PoE-powered system design.
FAQ
What is the maximum input voltage rating for LM5070MTCX-50/NOPB?
The LM5070MTCX-50/NOPB supports a maximum VIN-to-VEE voltage of 80 V absolute maximum, with continuous operation specified from 1.8 V to 75 V. This range accommodates standard PoE voltages (44–57 V) plus margin for transients and long-cable voltage drop recovery. Operation above 75 V risks exceeding thermal limits and violating IEEE 802.3af specifications.
Does LM5070MTCX-50/NOPB require external slope compensation?
No, LM5070MTCX-50/NOPB does not require external slope compensation because it enforces a hardware-limited 50% maximum duty cycle and omits internal slope compensation circuitry. This simplifies design for flyback or forward converters operating at ≤50% duty cycle, unlike the -80 variant which includes slope compensation for >50% operation.
How is the classification current programmed on LM5070MTCX-50/NOPB?
The classification current on LM5070MTCX-50/NOPB is programmed by connecting an external resistor between the RCLASS pin and VEE. For example, a 82.5 Ω resistor sets Class 2 (17–20 mA). Leaving RCLASS open configures Class 0 (0–4 mA). The internal 1.5 V reference and bias current are factored into resistor calculation per Table 2 in the datasheet.
What is the purpose of the ARTN pin on LM5070MTCX-50/NOPB?
The ARTN pin on LM5070MTCX-50/NOPB serves as the dedicated analog ground return for precision circuitry including the error amplifier, current sense comparator, and oscillator timing network. It must be routed separately from high-current RTN and connected to VEE only at a single point to minimize noise coupling into sensitive analog nodes.
Can LM5070MTCX-50/NOPB drive an external MOSFET directly?
Yes, LM5070MTCX-50/NOPB's OUT pin provides 800 mA peak sink current and is designed to directly drive the gate of external N-channel MOSFETs in flyback or forward topologies. Gate drive rise/fall times are 15 ns into 1 nF load. For high-side or synchronous rectifier configurations, external level-shifting or driver stages are required.
LM5070MTCX-50/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- -
- Internal Switch(s):
- Both
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 1.8V ~ 75V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
LM5070MTCX-50/NOPB FAQ
1.How can I place an order for LM5070MTCX-50/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5070MTCX-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 LM5070MTCX-50/NOPB reliable?
The price and inventory of LM5070MTCX-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 LM5070MTCX-50/NOPB is usually 5 days.
3.What payment methods are accepted for LM5070MTCX-50/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5070MTCX-50/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5070MTCX-50/NOPB?
LM5070MTCX-50/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5070MTCX-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 LM5070MTCX-50/NOPB?
For technical support, including LM5070MTCX-50/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5070MTCX-50/NOPB requirements.
6.How does Aetrix verify that LM5070MTCX-50/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5070MTCX-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 LM5070MTCX-50/NOPB meets industry standards.
7.What is the process for return or replacement of LM5070MTCX-50/NOPB?
All LM5070MTCX-50/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5070MTCX-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 LM5070MTCX-50/NOPB part is unused and in its original packaging.
Return procedure for LM5070MTCX-50/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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