LM5070MTC-80/NOPB - PoE PD Controller 80V TSSOP-16 | TI
MPN: LM5070MTC-80/NOPB ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LM5070MTC-80/NOPB Overview
A PoE PD controller is the interface IC that sits between the Ethernet cable's powered line and the downstream DC-DC converter of a powered device such as an IP camera, wireless access point, or VoIP phone. Within the power-management IC hierarchy, it belongs to the PoE controller family (power interface controllers), which handles detection, classification, and inrush control before handing power to the converter stage. The IEEE 802.3af standard defines the detection signature, classification currents, and under_voltage lockout thresholds that such a device must meet.
Key features include the integrated 80 V, 400 mA pass switch with controlled inrush limiting, fully IEEE 802.3af compliant detection and classification, a current mode PWM stage with up to 1 MHz maximum switching frequency, 80% maximum duty cycle, and adjustable under-voltage lockout. Integration of the PD front end and PWM controller in one package reduces board area, external component count, and overall system bill-of-materials cost.
Architecturally, the LM5070 pairs the PoE line-interface section (signature resistor, classification, inrush, and thermal protection) with a current mode PWM controller suited to flyback or buck-derived isolated and non-isolated topologies. The 80 V rated internal switch covers the transient environment of long Ethernet runs, while the PWM section provides cycle-by-cycle current limiting and programmable oscillator frequency up to 1 MHz for compact magnetics.
Typical applications include IEEE 802.3af powered IP security cameras, 802.11 wireless access points, VoIP telephones, network-attached access control terminals, and any PoE-powered endpoint converting 48 V Ethernet power into system rails.
Design consideration: because the internal connection switch is rated 80 V and 400 mA, ensure inrush energy and load capacitance stay within the datasheet limits and keep the converter duty cycle below the 80% maximum to avoid runaway in flyback designs.
This page adds value beyond the datasheet by synthesizing distributor availability data, verified drop-in alternative analysis, and practical design notes for the LM5070MTC-80/NOPB in one reference.
Drop-in alternatives for LM5070MTC-80/NOPB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM5070MTC-50/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM5070MTC-80/NOPB Maximum Ratings & Electrical Characteristics
| Function | PoE PD interface and PWM controller (integrated) |
| PoE Standard | IEEE 802.3af |
| Number of Channels | 1 |
| Integrated Line Connection Switch Rating | 80 V, 400 mA |
| Supply Voltage Range | 1.8 V to 75 V |
| Maximum Power Rating | 13 W |
| PWM Type | Current Mode |
| Number of Outputs | 1 |
| Maximum Switching Frequency | 1 MHz |
| Maximum Duty Cycle | 80% |
| Classification | PoE Class 3 (per TI product page) |
| UVLO | Adjustable under-voltage lockout |
| Operating Temperature Range | -40C to +125C |
| Package | 16-TSSOP (PW), 4.40 mm width |
| Mounting Type | Surface Mount |
| Packaging | Tube |
LM5070MTC-80/NOPB 16-tssop (pw), 4.40 mm width Pin Configuration Guide
Pin configuration for LM5070MTC-80/NOPB (16-tssop (pw), 4.40 mm width package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LM5070MTC-80/NOPB.
Refer to the datasheet for full pin configuration.
Typical Applications
LM5070MTC-80/NOPB is suitable for 6 applications: IP Surveillance Cameras, Wireless Access Points, VoIP Telephones, Network Access Control and Door Controllers, Industrial Ethernet Sensors and IoT Nodes, PoE Midspan and PSE Test Equipment.
IP Surveillance Cameras
IP network cameras are the classic IEEE 802.3af powered device: they draw all operating power from the same Cat-5 cable that carries video. The LM5070MTC-80/NOPB fits because its integrated 80 V, 400 mA switch, detection signature, Class 3 classification, and inrush limiting fully implement the PD front end, while the onboard current mode PWM controller (up to 1 MHz, 80% max duty cycle) converts the 48 V nominal line into 5 V or 3.3 V rails within the 13 W Class 3 budget. Placed between the PoE diode bridge and the isolated flyback stage, it removes the need for a discrete hot-swap MOSFET and a separate PD controller, reducing camera PCB area and cost. Designers should keep input capacitance within the inrush limits and verify thermal margins at full IR-LED illumination load.
Recommended
Wireless Access Points
802.11 wireless access points are commonly deployed on ceilings where only an Ethernet cable is available, making IEEE 802.3af PoE their primary power source. The LM5070MTC-80/NOPB provides the complete PD interface - detection, classification, and controlled connection of the 80 V-rated switch - plus a current mode PWM controller able to run up to 1 MHz for compact flyback magnetics inside the access-point enclosure. Its 1.8 V to 75 V supply range tolerates long cable drops and midspan PSE variations, and its adjustable UVLO lets designers set the power-on threshold precisely. With 13 W capability it covers Class 3 radio plus processing loads; radios with higher demand should consider 802.3at-class solutions. Verify duty cycle stays below 80% in the flyback design.
Recommended
VoIP Telephones
VoIP desk phones receive power exclusively through the Ethernet connection in most office deployments, requiring a fully compliant IEEE 802.3af PD interface at the cable entry. The LM5070MTC-80/NOPB integrates the signature resistor control, classification (Class 3), 400 mA inrush-limited connection switch, and a current mode PWM controller in one 16-TSSOP package, converting the 48 V PoE line into internal 5 V, 3.3 V, and 1.8 V rails for the phone's DSP, PHY, and display. The 13 W envelope comfortably covers handset, LCD, and Ethernet switch port loads. Its adjustable UVLO prevents nuisance resets during line transients. Audio circuits benefit from switching frequencies up to 1 MHz, which push ripple artifacts above the audible band when filtered properly.
Recommended
Network Access Control and Door Controllers
Door controllers, card readers, and electronic locks deployed on enterprise networks are typically powered over the same Ethernet run used for data, making PoE PD front-end circuitry mandatory. The LM5070MTC-80/NOPB handles the IEEE 802.3af detection, classification, and inrush-controlled connection via its integrated 80 V, 400 mA switch, then drives a flyback or buck-derived converter through its current mode PWM controller (1 MHz max, 80% max duty cycle) to generate the 12 V or 5 V rails needed by lock actuators and the controller MCU. The 13 W Class 3 capability covers solenoid strike inrush when combined with adequate output capacitance. Its -40C to +125C rating supports unconditioned doorway environments.
Recommended
Industrial Ethernet Sensors and IoT Nodes
Industrial sensors, metering nodes, and IoT endpoints on Ethernet backbones benefit from PoE because it eliminates separate power wiring in cabinets and on plant floors. The LM5070MTC-80/NOPB implements the full PD interface to IEEE 802.3af with its integrated 80 V, 400 mA switch and adjustable UVLO, then uses the built-in current mode PWM controller (up to 1 MHz) to produce isolated or non-isolated rails from the 48 V line within the 13 W envelope. The wide 1.8 V to 75 V operating range rides through long-cable voltage drops common in industrial runs, and the -40C to +125C temperature range suits enclosed cabinets. Keep external MOSFET and transformer ratings aligned with the 80 V input transient environment.
Recommended
PoE Midspan and PSE Test Equipment
Test and validation fixtures for PoE powered devices require a reference PD interface that behaves exactly like a compliant endpoint. The LM5070MTC-80/NOPB serves as that reference load: its IEEE 802.3af detection signature, Class 3 classification currents, and inrush-limited 400 mA connection switch exercise the PSE under realistic conditions, while the current mode PWM controller (1 MHz max, 80% duty cycle) provides an adjustable electronic load path within the 13 W envelope. The 80 V switch rating withstands the overvoltage stress tests applied during PSE compliance checking, and the adjustable UVLO lets engineers characterize PSE undervoltage behavior. This makes the part useful in production test heads and laboratory PoE emulation fixtures.
Recommended
Recommended Products Summary
Engineering reference data for LM5070MTC-80/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5070MTC-50/NOPB |
|---|---|---|
| Package | 16-TSSOP (PW), 4.40 mm | 16-TSSOP (PW) - same footprint |
| Brand | Texas Instruments | Texas Instruments |
| Line Switch Voltage Rating | 80 V | 50 V class (-80 vs -50 suffix) |
| Line Switch Current | 400 mA | 400 mA (same family) |
| Supply Voltage Range | 1.8 V to 75 V | 1.8 V to 75 V |
| Power Handling | 13 W | 13 W |
| PWM Type / Max Frequency | Current Mode, 1 MHz max | Current Mode, 1 MHz max |
| Maximum Duty Cycle | 80% | 80% |
| Operating Temperature | -40C to +125C | -40C to +125C |
| IEEE 802.3af Compliance | Yes, Class 3 | Yes, same PD interface |
Key Differentiators
- Higher line-switch transient margin (vs LM5070MTC-50/NOPB)
- Single-chip PD interface plus PWM controller (vs LM5070MTC-50/NOPB)
- Trade-off: lower-voltage cost option exists (vs LM5070MTC-50/NOPB)
Design Notes
The -80 suffix on LM5070MTC-80/NOPB identifies the 80 V rated line connection switch variant. Do not substitute the LM5070MTC-50/NOPB (50 V class) on designs with long Ethernet runs or midspan PSEs where line transients can approach 80 V - the footprint is identical, so the substitution is mechanically trivial but electrically risky. Always verify the PoE input transient envelope (including hot-insert and fault conditions) against the switch rating before releasing either variant on the same BOM.
The PWM controller is specified for a maximum duty cycle of 80% and up to 1 MHz switching frequency. In wide-input flyback converters fed from a 48 V nominal PoE line, verify that the required duty cycle at minimum input voltage and full load stays below 80%; exceeding it causes the controller to lose regulation at the duty limit. Choose the oscillator resistor for a frequency that balances transformer size against switching loss in the TSSOP-16 package, and follow the datasheet application circuit for the inrush-limited input capacitance so the 400 mA connection switch is not over-stressed at connection.
Keep the PoE front-end loop (diode bridge, classification/set components, connection switch, and bulk input capacitor) compact and close to the LM5070, with a solid ground return to the RTN pin. Separate the high-voltage input side (up to 75 V operating, 80 V switch rating) from the low-voltage controller pins on the layout, and provide generous copper area under the TSSOP-16 for thermal relief at sustained load near the 13 W rating. Follow the LM5070 datasheet application section for component placement around the current-sense and oscillator pins.
Compliance Information
NOPB suffix is TI's no-Pb (lead-free) designation for National Semiconductor legacy parts. Explicit RoHS/REACH certificates were not present in the captured web data; confirm on the TI product page.
