LM5070MTC-50 - PoE PD Interface & PWM Controller | TI
Артикул: LM5070MTC-50 ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $1 | $1,00 |
LM5070MTC-50 Обзор
A PoE PD interface controller is the front-end circuit that lets a networked device safely draw power over the Ethernet cable itself. Within the power management hierarchy, it sits between the Ethernet port and the isolated DC-DC converter, performing classification, inrush limiting, and undervoltage lockout before handing a regulated bus to the switching stage. The LM5070 integrates this interface and the PWM modulator on one die, eliminating discrete PD interface ICs.
Key features include full IEEE 802.3af compliance with integrated detection, classification, and inrush current control; an integrated 80V, 400mA pass switch that handles the line-connection sequencing; and a full-featured current-mode PWM controller supporting flyback and other isolated topologies for converting the 48V PoE input rail to system voltages.
Technically, the device combines the PD interface state machine with a current-mode PWM engine operating at a nominal 580 kHz, allowing compact transformer designs. The 80V switch rating provides ample margin above the 48V nominal PoE voltage, including transient headroom, and the adjustable UVLO threshold (6.25V reference for the -50 variant) enables precise power-good detection.
Typical applications include IP security cameras, VoIP phones, wireless access points, and any IEEE 802.3af-powered network endpoint needing an integrated PD front end plus converter control.
Design consideration: verify the UVLO setting and external N-channel MOSFET sizing for the downstream converter, since the PWM controller drives an external power stage; thermal and inrush behavior should be validated at maximum cable length where series resistance is highest.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Аналоги без доработки для LM5070MTC-50 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
LM5070MTC-50/NOPB
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LM5070MTCX-50/NOPB
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LM5070MTC-50 Максимальные параметры и электрические характеристики
| Функция | PoE PD Interface + Current-Mode PWM Controller |
| PoE Standard | IEEE 802.3af |
| Internal Line Connection Switch | 80 V, 400 mA |
| Oscillator Frequency | 580 kHz |
| UVLO Threshold | 6.25 V |
| Диапазон входного напряжения | 1.8 V to 75 V |
| Control Topology | Current-mode PWM |
| Number of Channels | 1 |
| Корпус | TSSOP-16 (PW) |
| Тип монтажа | Surface Mount |
| Рабочая температура | -40C to +125C |
| Temperature Grade | Automotive |
| Number of Terminals | 16 |
| Classification current levels | IEEE 802.3af class signaling |
Руководство по цоколевке LM5070MTC-50 в корпусе tssop-16 (pw)
Цоколевка для LM5070MTC-50 (корпус tssop-16 (pw)). Этот силовой прибор имеет выводы затвора, стока и истока. Для неполяризованных корпусов обратитесь к техническому описанию производителя для точной ориентации вывода 1 и деталей посадочного места. Типичные применения включают проектирование источников питания, управление двигателями и коммутацию нагрузки.
Нет подробных данных о распиновке для LM5070MTC-50.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
LM5070MTC-50 подходит для 6 применениеs: IP Security Camera PoE Power, VoIP Phone PD Interface, Wireless Access Point Power Front End, Building Automation and Control Nodes, Industrial PoE Converters and Midspan Derivatives, PoE-Powered IoT Gateways.
IP Security Camera PoE Power
The LM5070MTC-50 is a natural fit for IP surveillance cameras, which are overwhelmingly powered over Ethernet under IEEE 802.3af. Its integrated 80V, 400mA line connection switch handles detection, classification, and inrush limiting, while the 580 kHz current-mode PWM controller drives an isolated flyback converter producing 3.3V/5V/12V camera rails from the 48V PoE input. Because cable runs of 100 m add significant series resistance, the adjustable UVLO (6.25V reference) allows accurate power-good detection at the far end. The -40C to +125C TSSOP-16 also tolerates sealed outdoor camera enclosures with limited airflow.
Рекомендуется
VoIP Phone PD Interface
VoIP desk phones receive all operating power from the Ethernet switch under IEEE 802.3af, requiring a compliant PD front end exactly like the LM5070MTC-50. The device's integrated detection and classification signaling presents the correct 25kW signature and class current to the PSE, while its 80V-rated pass switch safely limits inrush during connection. The on-chip 580 kHz current-mode PWM controller then drives an isolated flyback stage generating phone logic, analog, and ring-generator supplies. Integrating both functions in one TSSOP-16 reduces board area in the handset base and shortens compliance validation.
Рекомендуется
Wireless Access Point Power Front End
802.11 wireless access points powered from ceiling PoE drops use the LM5070MTC-50 to interface to the 48V Ethernet power and control a flyback converter supplying RF PA and baseband rails. The 1.8V to 75V input window and 80V switch rating absorb PoE transients without external protection devices. Its current-mode control at 580 kHz allows a compact transformer suited to low-profile AP enclosures, and the adjustable UVLO ensures the AP boots only when PSE power is valid, preventing brown-out reboot loops at long cable lengths. The -40C to +125C rating covers plenum and rooftop installations.
Рекомендуется
Building Automation and Control Nodes
Industrial building controllers, HVAC sensors, and access-control panels increasingly use PoE for combined data and power. The LM5070MTC-50 gives these nodes a fully IEEE 802.3af-compliant PD interface with the 80V/400mA connection switch handling hot-plug inrush, and its automotive temperature grade (-40C to +125C) suits electrical cabinets and rooftop units. The 580 kHz current-mode PWM controller drives an isolated flyback delivering 5V/12V control rails from the PoE bus, while the 6.25V UVLO reference supports precise power-valid monitoring in noisy, long-cable environments.
Рекомендуется
Industrial PoE Converters and Midspan Derivatives
Generic industrial PoE-powered modules - serial servers, PLC remote I/O, and sensor concentrators - benefit from the LM5070MTC-50's integration of PD interface and PWM control on one die. The 1.8V to 75V operating window provides wide margin over the nominal 48V PoE rail including surge conditions, and the 80V, 400mA internal switch eliminates the external pass FET and its driver stage. The current-mode flyback controller at 580 kHz supports compact magnetics, and the adjustable UVLO lets module designers set a custom power-good threshold matching the module's minimum operating voltage.
Рекомендуется
PoE-Powered IoT Gateways
Edge IoT gateways combine an Ethernet uplink with local wireless and sensor interfaces, often drawing power entirely through the PoE cable. The LM5070MTC-50 performs the 802.3af PD handshake through its integrated 80V/400mA switch and controls an isolated flyback that creates a primary 12V rail, from which low-IQ bucks and LDOs derive MCU, radio, and sensor supplies. Its 580 kHz switching frequency minimizes transformer size for gateway enclosures, and the -50 variant UVLO setting guarantees clean startup behavior from switches of differing class budgets, avoiding repeated brown-out cycling.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LM5070MTC-50 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LM5070MTC-50/NOPB | LM5070MTCX-50/NOPB |
|---|---|---|---|
| Package | TSSOP-16 (PW) | TSSOP-16 (PW) - same | TSSOP-16 (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| PoE Standard | IEEE 802.3af | IEEE 802.3af | IEEE 802.3af |
| Internal Switch Rating | 80 V, 400 mA | 80 V, 400 mA | 80 V, 400 mA |
| Oscillator Frequency | 580 kHz | 580 kHz | 580 kHz |
| Input Voltage Range | 1.8 V to 75 V | 1.8 V to 75 V | 1.8 V to 75 V |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C |
| Packaging Difference | Standard order code | Lead-free NOPB ordering code | Larger reel quantity (X suffix) |
Ключевые отличия
- Single-chip integration of PD interface and PWM controller (против LM5070MTC-50/NOPB)
- Identical footprint across ordering variants (против LM5070MTCX-50/NOPB)
- Legacy legacy-code sourcing vs current TI codes (против LM5070MTC-50/NOPB)
Заметки по проектированию
The LM5070MTC-50 contains two functionally independent sections - the IEEE 802.3af PD interface and the PWM controller - and both must be validated during bring-up. A common mistake is testing the flyback stage before confirming the PD interface completes detection and classification with the target PSE; if the class resistor is mis-sized, the PSE never applies full 48V power and the converter section appears non-functional. Always validate with a PoE-powered switch or PSE simulator, not just a bench supply, per the datasheet test setup.
Program the UVLO divider carefully. The -50 variant uses a 6.25V threshold reference, and the divider must account for cable voltage drop: a 100 m Cat5 run at full 802.3af load can drop several volts, so set the power-valid threshold low enough to prevent startup chatter while high enough to ensure the flyback can regulate. Estimated: with 48V nominal input, reserve at least 6-8V margin for cable and bridge losses before the UVLO trip point engages.
Keep the current-mode PWM loop compact: the current-sense resistor, MOSFET gate drive trace, and transformer primary should form a short, low-inductance loop, and the sense resistor ground should return directly to the IC ground pin (Kelvin connection). Place the 802.3af interface components (class resistor, inrush programming elements) away from the 580 kHz switching node to prevent classification misreads from switching noise coupling. Use the typical application layout in the manufacturer datasheet as the starting point.
Информация о соответствии
The /NOPB suffix indicates TI's non-Pb (lead-free) plating process for the current ordering code; full RoHS/REACH declarations should be taken from the official TI product page for the specific suffix ordered.
