My Inquiry
My Account
Texas Instruments LM5070MTCX-80/NOPB
- Part No.:
- LM5070MTCX-80/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5070MTCX-80/NOPB.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM5070MTCX-80/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 80V/400mA MOSFET, 80% max duty cycle, programmable inrush current limit (75–390 mA), and thermal shutdown protection. It enables single-chip PoE PD designs for IP phones, wireless access points, and network cameras.
For engineers reviewing the LM5070MTCX-80/NOPB datasheet, LM5070MTCX-80/NOPB pinout, LM5070MTCX-80/NOPB application, or LM5070MTCX-80/NOPB equivalent, key selection criteria include IEEE 802.3af signature/classification compliance, internal MOSFET RDS(ON) ≤ 2.2 Ω, slope compensation for >50% duty cycle operation, UVLO programmability (2.00 V threshold), and TSSOP-16 package compatibility with PoE front-end and flyback/forward SMPS topologies.
Technical Context
The LM5070MTCX-80/NOPB integrates a full IEEE 802.3af PD interface-including detection (1.8–10.0 V), classification (12.5–20.5 V), and programmable inrush current limiting-with a current-mode PWM controller featuring slope compensation, 200 kHz typical oscillator frequency (RT = 30.3 kΩ), and 800 mA peak gate drive. Its internal 80V/400mA MOSFET handles line connection switching and inrush control.
Power sequencing is fully autonomous: RTN voltage drop below 1.5 V relative to VEE triggers VCC regulator enablement, initiating soft-start and SMPS operation. The device supports both isolated (optocoupler feedback via COMP/FB) and non-isolated (direct FB scaling) converter configurations, with error amplifier reference fixed at 1.25 V and gain-bandwidth of 4 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3af PD interface requirements including signature (25 kΩ), classification, and inrush timing. |
| Input Voltage Range | 1.8 V to 75 V - supports full PoE input range including legacy PSEs and transient surges up to 80 V absolute max. |
| Internal MOSFET | 80 V, 400 mA, RDS(ON) ≤ 2.2 Ω - eliminates external switch, reduces BOM count, and enables compact front-end design. |
| Duty Cycle Limit | 80% maximum with slope compensation - enables stable current-mode control in flyback/forward converters above 50% duty cycle. |
| Oscillator Frequency | 175–225 kHz (RT = 30.3 kΩ) - sets switching frequency for optimized magnetics size and efficiency in PoE SMPS. |
| Inrush Current Limit | Programmable 75–390 mA via RCLP resistor - ensures <75 ms capacitor charge time per IEEE 802.3af while supporting low-power legacy PSEs. |
| UVLO Threshold | 2.00 V ±50 mV with programmable hysteresis - allows precise turn-on/turn-off control using external resistor divider from VIN to UVLORTN. |
Pinout & Package
TSSOP-16 package (Package Code PW), thermally enhanced with exposed pad bonded to VEE for low θJA = 125 °C/W. Pinout validated per TI SNVS308G Rev. April 2013 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side input | Connects to diode-OR'd PoE input lines; withstands up to 80 V transient; powers internal HV regulator. |
| RSIG | Signature detection node | Accepts 25 kΩ resistor to VIN for IEEE 802.3af detection impedance (23.75–26.25 kΩ). |
| RCLASS | Classification current sink | Sinks programmable current (0–44 mA) to set IEEE class; open for Class 0 default. |
| UVLO | UVLO sense input | 2.00 V threshold pin; used with external divider to set turn-on voltage (min 23 V recommended). |
| RCLP | Inrush current programming | Resistor sets initial charging current (75–390 mA); open defaults to 390 mA. |
| OUT | PWM gate driver output | 800 mA peak sink capability drives external MOSFET gate; cycle-by-cycle current limiting active. |
| CS | Current sense input | 0.5 V threshold comparator input; blanked for 55 ns to reject leading-edge spikes. |
| 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 directly to optocoupler in isolated topologies. |
| RT | Oscillator timing | Resistor-to-ARTN sets frequency; also accepts ac-coupled sync pulses >3.7 V peak. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80 V/400 mA MOSFET | Reduces component count and PCB area; eliminates need for external high-voltage switch in PoE front-end. |
| Programmable inrush current limit | Enables reliable startup across diverse PSEs - from full 15.4 W IEEE-compliant units to legacy low-power sources. |
| Slope compensation (–80 suffix) | Stabilizes current-mode control in flyback/forward converters operating above 50% duty cycle without external circuitry. |
| Autonomous power sequencing | Eliminates external timing components: RTN voltage monitoring triggers VCC enable → soft-start → SMPS operation. |
| Dual-mode feedback support | Internal 1.25 V reference and COMP open-drain output allow direct use in non-isolated buck or isolated flyback with optocoupler. |
Applications
| IP Telephony | Wireless Access Points |
|---|---|
Use Scenario: Powering VoIP desk phones over standard Cat5e Ethernet cabling in enterprise offices. IC Role / Device Role / Timing Role: PD interface controller managing IEEE 802.3af detection, classification (Class 2 or 3), and inrush-limited charging of bulk input capacitor before enabling DC-DC conversion. Use Value: Enables single-chip PoE PD implementation with no external MOSFET or discrete UVLO circuit, reducing bill-of-materials and layout complexity. | Use Scenario: Delivering power and data to dual-band 802.11ac access points mounted on ceilings or walls. IC Role / Device Role / Timing Role: Integrated PoE front-end and PWM controller driving isolated flyback converter with optocoupler feedback via COMP/FB pins. Use Value: Supports high-efficiency, thermally robust operation up to 125°C ambient with built-in thermal shutdown and slope-compensated current-mode control. |
| Network Cameras | IoT Edge Sensors |
Use Scenario: Powering HD PTZ security cameras with motorized pan/tilt and IR illumination over PoE. IC Role / Device Role / Timing Role: Handles high inrush demand during cold start (capacitor charging + motor initialization) while maintaining IEEE 802.3af compliance via RCLP-programmed current limit. Use Value: Prevents PSE shutdown during startup by limiting peak inrush to ≤390 mA, ensuring reliable power delivery even with marginal PSE headroom. | Use Scenario: Enabling battery-free, always-on industrial sensors connected via PoE-enabled field switches. IC Role / Device Role / Timing Role: Low-quiescent-current PD interface (≤10 µA in detection mode) paired with efficient non-isolated buck converter for 3.3 V/5 V system rails. Use Value: Extends operational uptime by minimizing standby losses and supporting wide-input (1.8–75 V) operation across varying PSE output tolerances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5071MTCX-80/NOPB | Same pinout and core functionality, but includes integrated 100 V MOSFET and higher current rating (600 mA). | Better suited for higher-power Class 4 applications or systems requiring extended surge tolerance beyond 80 V. | Select LM5071MTCX-80/NOPB when input transients exceed 80 V or inrush current >400 mA is required. |
| LT4275IMS#TRPBF | Linear Technology (now Analog Devices) PoE PD interface with integrated hot-swap controller, no internal PWM controller. | Requires external DC-DC controller; offers superior ESD robustness (±15 kV HBM) and advanced fault logging. | Choose LT4275IMS#TRPBF when system-level diagnostics, higher ESD immunity, or modular architecture (separate PD interface + SMPS controller) is preferred. |
Compared with LM5070MTCX-80/NOPB, LM5071MTCX-80/NOPB provides higher voltage/current headroom for future-proofing, while LT4275IMS#TRPBF trades integration for diagnostic depth and robustness-making LM5070MTCX-80/NOPB optimal for cost-sensitive, self-contained PoE PD designs needing minimal external components.
Availability
LM5070MTCX-80/NOPB is available at Aetrix Electronics and suitable for IP telephony, wireless infrastructure, network video surveillance, and industrial IoT edge devices requiring stable component supply and long-term PoE design continuity.
Supply support for LM5070MTCX-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 for industrial, automotive, and communications markets.
The LM5070 belongs to TI's Power over Ethernet interface product line, designed specifically to simplify IEEE 802.3af-compliant Powered Device implementation with integrated front-end control and PWM regulation in a single IC.
FAQ
What is the maximum input voltage the LM5070MTCX-80/NOPB can handle?
The LM5070MTCX-80/NOPB has an absolute maximum VIN-to-VEE rating of 80 V, with continuous operation specified from 1.8 V to 75 V. This allows safe operation under IEEE 802.3af PoE conditions, including worst-case transients and legacy PSE outputs. Derating applies below –40°C (76 V max). Exceeding 80 V risks permanent damage to the internal MOSFET and interface circuitry.
Does the LM5070MTCX-80/NOPB require an external MOSFET for PoE interface operation?
No, the LM5070MTCX-80/NOPB integrates an 80 V, 400 mA internal MOSFET with RDS(ON) ≤ 2.2 Ω, eliminating the need for an external switch in most Class 0–3 PoE applications. This internal FET handles signature detection, classification current sinking, and controlled inrush charging - significantly reducing external component count and PCB footprint compared to discrete solutions.
How does the LM5070MTCX-80/NOPB implement IEEE 802.3af signature detection?
The LM5070MTCX-80/NOPB implements signature detection by enabling a 25 kΩ resistor between VIN and RSIG when VIN exceeds 1.5 V - accounting for diode drops in barrel-rectifier networks. This yields an impedance of 23.75–26.25 kΩ, satisfying the IEEE 802.3af detection window. Quiescent current remains ≤10 µA during detection, and the signature resistor is automatically disabled above 11 V to minimize standby loss.
Can the LM5070MTCX-80/NOPB be used in isolated flyback converter designs?
Yes, the LM5070MTCX-80/NOPB supports isolated flyback topologies via its COMP pin, which provides an open-drain error amplifier output with internal 5 kΩ pull-up. When paired with an optocoupler on the secondary side, COMP interfaces directly to the phototransistor collector, enabling precise output voltage regulation. The internal 1.25 V reference and FB pin remain unused in this configuration, simplifying feedback loop design.
What is the purpose of the RCLP pin on the LM5070MTCX-80/NOPB?
The RCLP pin on the LM5070MTCX-80/NOPB programs the inrush current limit during PoE startup - critical for meeting the IEEE 802.3af <75 ms capacitor charge requirement. A resistor from RCLP to VEE sets the limit between 75 mA and 390 mA. Leaving RCLP open defaults to ~390 mA. This feature ensures compatibility with both full-power PSEs and legacy low-power sources without redesigning the front-end.
LM5070MTCX-80/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-80/NOPB FAQ
1.How can I place an order for LM5070MTCX-80/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5070MTCX-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 LM5070MTCX-80/NOPB reliable?
The price and inventory of LM5070MTCX-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 LM5070MTCX-80/NOPB is usually 5 days.
3.What payment methods are accepted for LM5070MTCX-80/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5070MTCX-80/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5070MTCX-80/NOPB?
LM5070MTCX-80/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5070MTCX-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 LM5070MTCX-80/NOPB?
For technical support, including LM5070MTCX-80/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5070MTCX-80/NOPB requirements.
6.How does Aetrix verify that LM5070MTCX-80/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5070MTCX-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 LM5070MTCX-80/NOPB meets industry standards.
7.What is the process for return or replacement of LM5070MTCX-80/NOPB?
All LM5070MTCX-80/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5070MTCX-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 LM5070MTCX-80/NOPB part is unused and in its original packaging.
Return procedure for LM5070MTCX-80/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5070MTCX-80/NOPB Tags
-
TPS2378DDAR
Texas Instruments
-
TPS23753APWR
Texas Instruments
-
TPS23756PWPR
Texas Instruments
-
TPS23750PWPR
Texas Instruments
-
MP8007GV-Z
Monolithic Power Systems Inc.
-
TPS23861PWR
Texas Instruments
-
TPS23753PWR
Texas Instruments
-
PD69201ILD-TR
Microchip Technology
-
SI3402-B-GM
Skyworks Solutions Inc.
-
SI3402-B-GMR
Skyworks Solutions Inc.
-
SI34071-A01-GMR
Skyworks Solutions Inc.
-
SI3404-A-GMR
Skyworks Solutions Inc.
Tech Hub
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.
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…
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…
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…
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 …
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…
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…
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…
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…
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…
