Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Over Ethernet (PoE) Controllers

Texas Instruments LM5070MTC-80/NOPB

Name: LM5070MTC-80/NOPB
Brand: Texas Instruments
SKU: LM5070MTC-80/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LM5070MTC-80/NOPB

Manufacturer:: Texas Instruments

Category:: Power Over Ethernet (PoE) Controllers

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: LM5070MTC-80/NOPB.pdf

Description:: IC POE CNTRL 1 CHANNEL 16TSSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:193

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LM5070MTC-80/NOPB from Texas Instruments is an IEEE 802.3af-compliant Powered Device (PD) interface and current-mode PWM controller IC with integrated 80V/400mA MOSFET, programmable inrush current limit (75–390 mA), 80% max duty cycle with slope compensation, and internal 7.8V VCC regulator. It enables PoE-powered endpoints such as VoIP phones and IP cameras.

For engineers reviewing the LM5070MTC-80/NOPB datasheet, LM5070MTC-80/NOPB pinout, LM5070MTC-80/NOPB application, or LM5070MTC-80/NOPB equivalent, key selection criteria include IEEE 802.3af signature/classification compliance, inrush current programmability via RCLP, UVLO hysteresis control, thermal shutdown at 165°C, and compatibility with flyback/forward topologies requiring single-gate drive.

Technical Context

The LM5070MTC-80/NOPB integrates dual functional blocks: a PoE PD interface supporting detection (1.8–10V), classification (12.5–20.5V), and UVLO (programmable 23–75V range with 10µA hysteresis current), plus a current-mode PWM controller with 200 kHz typical oscillator frequency (RT-set), 800 mA peak gate drive, and cycle-by-cycle current limiting triggered at 0.5 V on CS.

Its architecture features automatic power sequencing-interface MOSFET charges the SMPS input capacitor until RTN falls below 1.5 V relative to VEE, then enables VCC regulation and soft-start-plus dedicated analog return (ARTN) for noise-sensitive circuitry including error amplifier and current sense amplifier, ensuring stable loop control in isolated/non-isolated DC-DC designs.

Key Specifications

Parameter	Value and Actual Design Meaning
IEEE Compliance	Fully compliant with IEEE 802.3af Powered Device interface requirements including signature (25 kΩ), classification, and inrush current limiting.
Integrated MOSFET	80 V breakdown, 1 Ω R_DS(ON), 400 mA continuous rating-eliminates external high-voltage switch for PoE input stage.
Inrush Current Limit	Programmable 75–390 mA via RCLP pin; default 390 mA when open-ensures <75 ms capacitor charge per 802.3af.
Duty Cycle Limit	80% maximum with internal slope compensation-supports stable current-mode control above 50% duty in flyback converters.
Oscillator Frequency	175–225 kHz (RT = 30.3 kΩ); externally synchronizable-enables EMI reduction and multi-converter phase alignment.
Thermal Protection	165°C junction shutdown with 25°C hysteresis-prevents latch-up during overload or poor heatsinking in TSSOP-16 package.
VCC Regulator	7.8 V ±0.3 V output, 15 mA current limit-powers internal circuitry directly from VIN up to 75 V without auxiliary winding.

Pinout & Package

TSSOP-16 package (Package Code PW), thermally enhanced with exposed pad bonded to VEE; 0.65 mm pitch, 5.0 × 4.4 mm body size; RoHS-compliant, lead-free (NOPB suffix).

Pin/Terminal	Circuit Role	Design Meaning
VIN (1)	High-side input	Accepts PoE line voltage up to 75 V; diode-OR'd input for polarity insensitivity.
RSIG (2)	Signature resistor connection	Connects 25 kΩ resistor to VIN for 802.3af detection impedance; disabled above 11 V.
RCLASS (3)	Classification current sink	Sinks programmable current (0–44 mA) to set IEEE 802.3af Class 0–4; open = Class 0.
UVLO (4)	Undervoltage lockout sense	2.00 V threshold; external resistor divider sets turn-on/off voltages with 10 µA hysteresis current.
UVLORTN (5)	UVLO divider return	Return node for UVLO resistor network; must not connect to VEE to maintain <10 µA offset current.
RCLP (6)	Inrush current programming	Resistor value sets initial charging current (75–390 mA); open = 390 mA default.
VEE (7)	Negative supply reference	System low-potential return; connected to RJ45 barrel rectifier negative output.
RTN (8)	SMPS return path	Drain of internal MOSFET; connects VEE to dc-dc converter return-critical for current sensing accuracy.
OUT (9)	PWM gate driver output	800 mA peak sink capability drives external N-channel MOSFET gate in flyback/forward topologies.
VCC (10)	Internal bias regulator output	7.8 V regulated supply; powers internal logic; shuts down if auxiliary winding fails to sustain >6.25 V.
FB (11)	Error amplifier inverting input	1.25 V internal reference; used for output voltage feedback in non-isolated designs or optocoupler interface in isolated ones.
COMP (12)	Error amplifier output	Open-drain output with 5 kΩ internal pull-up; interfaces directly to optocoupler LED or compensation network.
CS (13)	Current sense input	0.5 V overcurrent threshold; blanked for 55 ns to reject leading-edge spikes-enables precise cycle-by-cycle limiting.
RT/SYNC (14)	Oscillator timing & sync input	RT resistor sets frequency; accepts narrow AC-coupled sync pulses >3.7 V for external clock synchronization.
SS (15)	Soft-start ramp control	10 µA internal current source charges external capacitor to control startup dV/dt and reduce stress.
ARTN (16)	Analog ground reference	Dedicated return for FB, COMP, CS, and RT-minimizes noise coupling into sensitive analog circuits.

Key Features

Feature	Design Value
IEEE 802.3af Detection & Classification	Hardware-enforced signature (25 kΩ) and programmable classification current (0–44 mA) meet full PSE handshake requirements without firmware.
Integrated 80V Power MOSFET	Eliminates external high-voltage switch and associated gate drive complexity while maintaining <1 Ω R_DS(ON) at 25°C.
Programmable Inrush Current Limit	Single-resistor (RCLP) configuration enables robust startup under legacy PSEs with limited current capacity (e.g., 75 mA for low-power VoIP).
Current-Mode PWM with Slope Compensation	Enables stable operation in flyback converters at duty cycles >50%; eliminates subharmonic oscillation without external components.
Thermal Shutdown with Hysteresis	165°C trip point +25°C hysteresis prevents thermal cycling in enclosed PoE devices; automatically recovers after cooling.
Dedicated Analog Return (ARTN)	Separates noise-sensitive analog ground (FB, COMP, CS) from power ground (RTN), improving regulation accuracy and EMI immunity.

Applications

VoIP Phones	Wireless Access Points
Use Scenario: Powered via Cat5e Ethernet cable from PoE switch in enterprise office environment. IC Role / Device Role / Timing Role: PD interface controller managing signature detection, classification, and inrush current limiting; PWM controller regulating isolated flyback DC-DC converter. Use Value: Enables single-cable deployment with guaranteed 802.3af compliance, reducing installation cost and eliminating local AC adapters.	Use Scenario: Wall-mounted Wi-Fi AP drawing up to 12.95 W from midspan injector in hotel corridor. IC Role / Device Role / Timing Role: Handles IEEE 802.3af Class 3 classification (26–30 mA), controls inrush into bulk input capacitor, and drives synchronous rectified flyback converter. Use Value: Ensures reliable startup under marginal PSE conditions and maintains stable 3.3 V/5 V rails despite variable input voltage (37–57 V).
IP Security Cameras	Thin Client Terminals
Use Scenario: Outdoor PTZ camera with heater and IR LEDs powered over long Ethernet runs (>100 m). IC Role / Device Role / Timing Role: Provides UVLO hysteresis tuning to accommodate voltage drop across long cables; manages thermal shutdown during heater activation. Use Value: Prevents brownout resets during high-current heater bursts and ensures safe thermal derating in sealed enclosures.	Use Scenario: Fanless thin client in digital signage kiosk using PoE+ (802.3at) with backward-compatible 802.3af mode. IC Role / Device Role / Timing Role: Operates in Class 0 (open RCLASS) for universal compatibility; uses programmable RCLP to limit inrush during cold start. Use Value: Guarantees interoperability with legacy PoE switches while enabling rapid deployment without custom power supplies.

VoIP Phones

Wireless Access Points

Use Scenario: Powered via Cat5e Ethernet cable from PoE switch in enterprise office environment.

IC Role / Device Role / Timing Role: PD interface controller managing signature detection, classification, and inrush current limiting; PWM controller regulating isolated flyback DC-DC converter.

Use Value: Enables single-cable deployment with guaranteed 802.3af compliance, reducing installation cost and eliminating local AC adapters.

Use Scenario: Wall-mounted Wi-Fi AP drawing up to 12.95 W from midspan injector in hotel corridor.

IC Role / Device Role / Timing Role: Handles IEEE 802.3af Class 3 classification (26–30 mA), controls inrush into bulk input capacitor, and drives synchronous rectified flyback converter.

Use Value: Ensures reliable startup under marginal PSE conditions and maintains stable 3.3 V/5 V rails despite variable input voltage (37–57 V).

IP Security Cameras

Thin Client Terminals

Use Scenario: Outdoor PTZ camera with heater and IR LEDs powered over long Ethernet runs (>100 m).

IC Role / Device Role / Timing Role: Provides UVLO hysteresis tuning to accommodate voltage drop across long cables; manages thermal shutdown during heater activation.

Use Value: Prevents brownout resets during high-current heater bursts and ensures safe thermal derating in sealed enclosures.

Use Scenario: Fanless thin client in digital signage kiosk using PoE+ (802.3at) with backward-compatible 802.3af mode.

IC Role / Device Role / Timing Role: Operates in Class 0 (open RCLASS) for universal compatibility; uses programmable RCLP to limit inrush during cold start.

Use Value: Guarantees interoperability with legacy PoE switches while enabling rapid deployment without custom power supplies.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Powered Device interface applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM5071MTC-80/NOPB	Same pinout and core functionality, but includes integrated 100 V MOSFET and supports 802.3at Type 2 (30 W) with higher current limit.	Required for PoE+ (802.3at) systems needing >15.4 W; not drop-in for 802.3af-only designs due to higher V_DS rating and altered thermal profile.	Select LM5071MTC-80/NOPB only when upgrading to PoE+ or operating above 75 V input; LM5070MTC-80/NOPB remains optimal for cost-sensitive 802.3af deployments.
LT4275AIMSE#TRPBF	Linear Technology (Analog Devices) 802.3af PD interface with integrated 100 V MOSFET, but no integrated PWM controller-requires external DC-DC controller.	Used in designs where separate PWM IC is preferred for flexibility or higher efficiency; lacks built-in oscillator, soft-start, or error amplifier.	Choose LT4275AIMSE#TRPBF when modular architecture is needed or when combining with advanced controllers like LT3748; LM5070MTC-80/NOPB offers tighter integration and lower BOM count.

Compared with LM5071MTC-80/NOPB, LM5070MTC-80/NOPB provides optimized 802.3af compliance at lower cost and thermal footprint, while LT4275AIMSE#TRPBF trades integration for design flexibility-making LM5070MTC-80/NOPB the most balanced choice for standard PoE-powered endpoints requiring self-contained power conversion.

Availability

LM5070MTC-80/NOPB is available at Aetrix Electronics and suitable for VoIP phones, wireless access points, IP security cameras, and thin client terminals requiring stable component supply and full IEEE 802.3af certification support.

Supply support for LM5070MTC-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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, energy efficiency, and system-level innovation.

The LM5070 product line delivers fully integrated Power over Ethernet Powered Device interfaces targeting cost-effective, space-constrained endpoint equipment requiring seamless 802.3af compliance and embedded DC-DC control.

FAQ

What is the maximum input voltage supported by the LM5070MTC-80/NOPB?

The LM5070MTC-80/NOPB supports a maximum input voltage of 75 V across VIN to VEE, with absolute maximum rating of 80 V. Operation above 75 V violates IEEE 802.3af specifications and risks exceeding thermal limits in the TSSOP-16 package. The internal 80 V MOSFET and UVLO circuitry are rated for transient surges up to 80 V, but sustained operation must remain ≤75 V per datasheet Operating Ratings.

How does the LM5070MTC-80/NOPB implement IEEE 802.3af signature detection?

The LM5070MTC-80/NOPB implements signature detection by enabling a 25 kΩ resistor between VIN and RSIG when input voltage exceeds 1.8 V, creating the required 23.75–26.25 kΩ impedance window. The device draws <10 µA during detection mode and disables the signature resistor above 11 V to reduce power loss. This hardware-based approach meets PSE measurement requirements without software intervention.

Can the LM5070MTC-80/NOPB be used in isolated flyback converter designs?

Yes, the LM5070MTC-80/NOPB supports isolated flyback topologies via its COMP pin, which provides an open-drain error amplifier output compatible with optocoupler feedback. An internal 5 kΩ pull-up resistor biases the optocoupler LED, and the FB pin can be tied to ARTN to disable the internal error amplifier when secondary-side regulation is used-enabling flexible implementation in both isolated and non-isolated systems.

What is the purpose of the ARTN pin on the LM5070MTC-80/NOPB?

The ARTN pin on the LM5070MTC-80/NOPB serves as the dedicated analog ground return for noise-sensitive circuitry-including FB, COMP, CS, and RT-to prevent switching noise from the power ground (RTN) from corrupting feedback and current sense signals. Connecting ARTN separately to a clean ground plane improves regulation accuracy, reduces EMI susceptibility, and stabilizes current-mode control in high-noise PoE environments.

Does the LM5070MTC-80/NOPB require external components for basic IEEE 802.3af compliance?

Yes, the LM5070MTC-80/NOPB requires external components for full IEEE 802.3af compliance: a 25 kΩ resistor between VIN and RSIG for signature detection, a classification resistor between RCLASS and VEE (or open for Class 0), UVLO divider resistors between VIN–UVLO–UVLORTN, and an RCLP resistor for inrush current programming (optional, defaults to 390 mA if open). These passive components configure critical handshake parameters per specification.

LM5070MTC-80/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

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

LM5070MTC-80/NOPB FAQ

1.How can I place an order for LM5070MTC-80/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM5070MTC-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 LM5070MTC-80/NOPB reliable?

The price and inventory of LM5070MTC-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 LM5070MTC-80/NOPB is usually 5 days.

3.What payment methods are accepted for LM5070MTC-80/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5070MTC-80/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM5070MTC-80/NOPB?

LM5070MTC-80/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM5070MTC-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 LM5070MTC-80/NOPB?

For technical support, including LM5070MTC-80/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5070MTC-80/NOPB requirements.

6.How does Aetrix verify that LM5070MTC-80/NOPB is sourced from the original manufacturer or authorized distributors?

All LM5070MTC-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 LM5070MTC-80/NOPB meets industry standards.

7.What is the process for return or replacement of LM5070MTC-80/NOPB?

All LM5070MTC-80/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5070MTC-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 LM5070MTC-80/NOPB part is unused and in its original packaging.

Return procedure for LM5070MTC-80/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…