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Microchip Technology PD70211ILQ-TR
- Part No.:
- PD70211ILQ-TR
- Manufacturer:
- Microchip Technology
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
PD70211ILQ-TR.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,645
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Product details
Overview
PD70211ILQ-TR from Microchip Technology is a PoE Powered Device (PD) interface IC with integrated PWM controller for IEEE 802.3af/at, HDBaseT, and UPoE applications. It delivers up to 95W via 4-pair PoE, features an integrated 0.3Ω isolation FET, supports 2/3/4/6-event classification, and enables rapid input capacitor discharge for fast re-detection. It is used in high-power PoE endpoints such as PTZ cameras and digital signage.
For engineers reviewing the PD70211ILQ-TR datasheet, PD70211ILQ-TR pinout, PD70211ILQ-TR application, or PD70211ILQ-TR equivalent, key selection criteria include its 4-pair power identification capability via SUPP_S1/SUPP_S2, programmable UVLO on VINS, synchronous Flyback/Active Clamp Forward topology support, and wall adapter (Rear Aux) mode compatibility.
Technical Context
The PD70211ILQ-TR integrates a front-end detection/classification block with 2–6 event classification logic and a current-mode PWM controller supporting Flyback, Active Clamp Forward, Buck, and Boost topologies. Its SUPP_S1/SUPP_S2 inputs identify active power pairs, while AT_FLAG, HD_FLAG, 4P_AT_FLAG, and 4P_HD_FLAG provide real-time PSE type and pair-count status.
It implements dual-stage thermal protection targeting both the isolation FET and classification sink, plus programmable UVLO hysteresis via VINS/HYST pins and soft-start control via SS pin. The internal bleeder discharges DC/DC input capacitors in ≤500 ms, enabling sub-second re-detection after cable reinsertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Standards | Complies with 802.3af, 802.3at, HDBaseT (PoH), and UPoE - enables interoperability across legacy and high-power PoE infrastructure. |
| Max Input Voltage | 57 V - supports full 4-pair PoE voltage range including worst-case 57 V at PSE output under load. |
| Isolation FET RDS(on) | 0.3 Ω - minimizes conduction loss and thermal rise during continuous 2 A operation. |
| Classification Current | Up to 42 mA (Class 4) - meets IEEE 802.3at Class 4 sink requirements with ±1 mA tolerance. |
| Switching Frequency | 100–500 kHz (adjustable via RFREQ resistor) - allows optimization of magnetics size vs. efficiency for Flyback or Active Clamp Forward designs. |
| Input Offset Current | <5 µA during detection - ensures reliable low-voltage detection down to 1.1 V without false triggers. |
| Capacitor Discharge Time | ≤500 ms (for ≤264 µF) - enables fast port re-engagement after hot-plug events in managed switches. |
Pinout & Package
PD70211ILQ-TR is housed in a lead-free QFN-36 package (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad. Pin 1 is marked by a dot; the package supports standard reflow profiles per J-STD-020 and provides θJA = 22.3°C/W on a 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SUPP_S1 / SUPP_S2 | 4-pair sensing inputs | Detect which Ethernet data pairs deliver power; used together to distinguish 2-pair vs. 4-pair PSE operation and assert 4P_AT_FLAG/4P_HD_FLAG. |
| AT_FLAG / HD_FLAG / 4P_AT_FLAG / 4P_HD_FLAG | Open-drain status flags | Indicate Type 2 (AT), HDBaseT (HD), or 4-pair variants; each pulls low after ≥80 ms delay post-capacitor charge completion. |
| RCLASS | Classification resistor terminal | Accepts 133 Ω (Class 1) to 30.9 Ω (Class 4); absence indicates Class 0 (3 mA max sink). |
| VINS / HYST | Programmable UVLO inputs | VINS sets turn-on threshold (1.2 V reference); HYST enables hysteresis via external resistor to prevent oscillation near threshold. |
| RFREQ / SS / RCLP | Topology configuration pins | RFREQ sets switching frequency (100–500 kHz); SS controls soft-start ramp time; RCLP disables/enables pulse-skip mode at light load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.3 Ω isolation FET | Eliminates need for external series MOSFET, reducing BOM count and PCB footprint while maintaining ≤2 A continuous current capability. |
| 2/3/4/6-event classification | Enables precise PSE identification and protocol negotiation - critical for multi-standard systems supporting af/at/HDBaseT/UPoE simultaneously. |
| 4-pair power identification | Uses SUPP_S1/SUPP_S2 to detect actual powered pairs, allowing firmware to configure DC/DC topology and thermal management accordingly. |
| Fast capacitor discharge circuit | Delivers ≥22.8 mA discharge current to reduce input cap voltage from 30 V to safe level in ≤500 ms - essential for IEEE 802.3bt compliance and hot-plug robustness. |
| Wall adapter (Rear Aux) support | WA_EN pin enables seamless fallback to external AC/DC adapter without hardware changes - maintains VAUX output and flag assertion during adapter operation. |
Applications
| PTZ Security Camera | HDBaseT Digital Signage |
|---|---|
|
Use Scenario: Outdoor IP camera requiring pan/tilt/zoom, heater, IR illumination, and video streaming over single Ethernet cable. IC Role / Device Role / Timing Role: PD70211ILQ-TR acts as primary PoE front-end and PWM controller, managing 4-pair power delivery, classification handshake, and synchronous Flyback DC/DC conversion. Use Value: Delivers stable 95W at >92% efficiency while enabling rapid re-detection after lightning-induced cable disconnects via integrated bleeder circuit. |
Use Scenario: 4K display receiving video, audio, USB, and Ethernet over HDBaseT cabling with local power sourcing. IC Role / Device Role / Timing Role: PD70211ILQ-TR identifies HDBaseT PSE via HD_FLAG, configures 4-pair power path, and regulates isolated output rails using Active Clamp Forward topology. Use Value: Supports simultaneous 4-pair power + HDBaseT signaling with <10 µA detection offset, ensuring reliable startup even under marginal cable conditions. |
| Industrial IoT Gateway | UPoE VoIP Phone with Video |
|
Use Scenario: Factory-floor gateway aggregating sensor data, running edge AI inference, and powering attached peripherals via PoE. IC Role / Device Role / Timing Role: PD70211ILQ-TR serves as intelligent PD interface with wall adapter fallback (WA_EN), enabling uninterrupted operation during PoE outage. Use Value: Dual-input capability (PoE + wall adapter) eliminates single-point failure; programmable UVLO prevents brownout resets during fluctuating industrial power. |
Use Scenario: Enterprise desk phone supporting HD video conferencing, Bluetooth headset pairing, and local storage - all powered via single Ethernet drop. IC Role / Device Role / Timing Role: PD70211ILQ-TR performs UPoE classification, manages 4-pair power distribution, and drives buck converter for low-noise audio rail generation. Use Value: Integrated 0.3 Ω FET and <5 µA offset current ensure Class 4 compliance and reliable detection in noisy office environments with long cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PD interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PD70210AL | Front-end only (no integrated PWM controller); 38-pin QFN; supports same IEEE standards and 4-pair identification. | Requires external PWM controller IC (e.g., MCP19035) for DC/DC regulation - increases component count and layout complexity. | Select PD70210AL only when design requires separate PWM control or uses non-standard topologies not supported by PD70211ILQ-TR's internal controller. |
| LT4275AIMSE#PBF | Analog Devices' 4-pair PD controller with integrated FET; supports 802.3af/at/bt; no native HDBaseT flag outputs; different pinout and UVLO programming method. | Lacks dedicated HD_FLAG/4P_HD_FLAG signals - requires firmware-based PSE identification; no SUPP_Sx pair-sensing capability. | Choose LT4275AIMSE#PBF for bt-compliant designs where HDBaseT signaling is absent and board space permits discrete FET implementation. |
Compared with PD70210AL and LT4275AIMSE#PBF, the PD70211ILQ-TR uniquely combines full 4-pair PoE front-end, integrated PWM controller, and native HDBaseT/UPoE flag signaling in one QFN-36 package - reducing bill-of-materials, simplifying layout, and accelerating time-to-market for multi-standard endpoints.
Availability
PD70211ILQ-TR is available at Aetrix Electronics and suitable for HDBaseT digital signage, IEEE 802.3at-powered PTZ cameras, and UPoE VoIP endpoints requiring stable component supply across production ramps and long-life deployments.
Supply support for PD70211ILQ-TR 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
Microchip Technology Inc. is a global provider of microcontrollers, analog devices, and connectivity solutions, serving automotive, industrial, and communications markets with ISO 9001-certified manufacturing.
The PD70211ILQ-TR belongs to Microchip's PoE Powered Device product line, engineered specifically for high-efficiency, multi-standard PoE endpoints demanding compact integration, fast re-detection, and robust 4-pair power management.
FAQ
What is the maximum continuous load current supported by the PD70211ILQ-TR?
The PD70211ILQ-TR supports continuous operation up to 2 A through its integrated 0.3 Ω isolation FET, as specified in the Electrical Characteristics table (ILOAD parameter). This rating assumes ambient temperature ≤85°C and proper PCB thermal design per Microchip's recommended layout guidelines in DS00003672A-page 23.
Does the PD70211ILQ-TR support IEEE 802.3bt (PoE++)?
The PD70211ILQ-TR does not support IEEE 802.3bt. Its datasheet explicitly lists compliance only with IEEE 802.3af, 802.3at, HDBaseT, and UPoE. While it handles 4-pair power delivery, it lacks the 802.3bt-specific autoclassification, multi-event signature, and higher-power classification protocols required for Type 3/4 PSE handshaking.
How does the PD70211ILQ-TR implement 4-pair power identification?
The PD70211ILQ-TR uses SUPP_S1 and SUPP_S2 pins to sense voltages across diode bridges on Ethernet data pairs. Based on their logic states (high/low combinations), it determines whether 2-pair or 4-pair power is applied and asserts 4P_AT_FLAG or 4P_HD_FLAG accordingly, as defined in Table 2-6 of DS00003672A.
Can the PD70211ILQ-TR operate without an external PWM controller?
Yes - the PD70211ILQ-TR contains a fully integrated current-mode PWM controller supporting Flyback, Active Clamp Forward, Buck, and Boost topologies. No external PWM IC is required; only external power stage components (MOSFETs, transformer, rectifiers, feedback network) must be added per the selected topology.
What is the purpose of the WA_EN pin on the PD70211ILQ-TR?
The WA_EN pin enables wall adapter (Rear Aux) mode: when pulled high, it forces the isolation FET OFF, activates all flag outputs (AT_FLAG, HD_FLAG, etc.), and enables VAUX output - allowing external AC/DC adapter to power the DC/DC converter independently of PoE, while retaining detection and classification functionality.
PD70211ILQ-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 36-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- -
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- Yes
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 57V (Max)
- Current - Supply:
- 1mA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (6x6)
PD70211ILQ-TR FAQ
1.How can I place an order for PD70211ILQ-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for PD70211ILQ-TR 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 PD70211ILQ-TR reliable?
The price and inventory of PD70211ILQ-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PD70211ILQ-TR is usually 5 days.
3.What payment methods are accepted for PD70211ILQ-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PD70211ILQ-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PD70211ILQ-TR?
PD70211ILQ-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PD70211ILQ-TR 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 PD70211ILQ-TR?
For technical support, including PD70211ILQ-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PD70211ILQ-TR requirements.
6.How does Aetrix verify that PD70211ILQ-TR is sourced from the original manufacturer or authorized distributors?
All PD70211ILQ-TR 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 PD70211ILQ-TR meets industry standards.
7.What is the process for return or replacement of PD70211ILQ-TR?
All PD70211ILQ-TR units undergo pre-shipment inspection (PSI). If there is an issue with PD70211ILQ-TR, 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 PD70211ILQ-TR part is unused and in its original packaging.
Return procedure for PD70211ILQ-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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