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Analog Devices Inc. LTC9102AUKJ#PBF
- Part No.:
- LTC9102AUKJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC9102AUKJ#PBF.pdf
- Description:
- 12-CHANNEL 802.3BT POE PSE
- Quantity:
- Payment:
- Shipping:
Inventory:1,070
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Product details
Overview
LTC9102AUKJ#PBF from Analog Devices is a 64-pin IEEE 802.3bt Type 3/4 and 802.3at Type 2 Power over Ethernet (PoE) power sourcing equipment (PSE) controller, designed for 48-port midspans or switches. It supports up to 48 single-channel ports or 24 dual-channel ports, delivers up to 71.3W per port via pin or I²C programming, and features 14-bit per-port current/power monitoring with 0.1Ω sense resistance and <30mΩ external MOSFET RDS(ON) support.
For engineers reviewing the LTC9102AUKJ#PBF datasheet, LTC9102AUKJ#PBF pinout, LTC9102AUKJ#PBF application, or LTC9102AUKJ#PBF equivalent, key selection considerations include IEEE 802.3bt compliance, per-port 14-bit power readback accuracy, transformer-isolated communication eliminating optocouplers, fast programmable shutdown, and ECC-protected eFlash for robust firmware storage in telecom and industrial PoE infrastructure.
Technical Context
The LTC9102AUKJ#PBF operates as the analog front-end of a two-chip PSE chipset with the LTC9101-1 host controller, handling gate drive, current sensing, and isolation-critical signaling for up to 48 PoE ports. It uses VEE-referenced negative supply architecture (AGND–VEE up to 80V), integrates 12 independent power channels (expandable to 48 via daisy-chain), and implements IEEE-mandated detection, classification, and maintain-power-signature (MPS) timing with tDIS = 320–400ms and tMPS = 6µs.
Its analog signal chain includes differential SENSEn–VSSKn inputs with 24.98 µV/LSB resolution for current measurement, 10.01 mV/LSB VEE readback, and programmable active current limits (VLIM-2P) ranging from 40mV to 124mV depending on PD class and signature type - all referenced to a 0.1Ω sense resistor and validated across –40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with 802.3bt Type 3/4 and 802.3at Type 2 PSE standards; supports single/dual-signature PD detection and 5-event physical classification. |
| Port Capacity | Configurable for up to 48 single-channel ports or 24 dual-channel ports; requires LTC9101-1 host controller for full system operation. |
| Sense Resolution | 24.98 µV/LSB per-port current readback with 14-bit effective resolution; enables ±0.5% full-scale accuracy with 0.1Ω sense resistor. |
| Power Delivery | Supports up to 71.3W per port (802.3bt Type 4); programmable via I²C or pin-strapping; uses external low-RDS(ON) MOSFETs (≤30mΩ). |
| Isolation Architecture | Transformer-isolated communication replaces optocouplers and isolated 3.3V supply; reduces BOM cost and improves reliability in high-noise environments. |
| Package | 64-lead 7mm × 11mm plastic QFN (UKJ); exposed pad (Pin 65) is VEE and must be soldered to PCB for thermal and electrical performance (θJA = 22°C/W). |
| I²C Interface | 1MHz compatible serial control interface; supports standard-mode and fast-mode timing; includes watchdog timer (1.5–3s) and interrupt-driven status reporting. |
Pinout & Package
64-lead 7mm × 11mm plastic QFN (UKJ) package with exposed VEE pad (Pin 65) requiring PCB soldering for thermal management (θJA = 22°C/W). Designed for use with LTC9101-1 host controller in a chipset configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (Pin 65) | Negative Supply Reference | Primary analog ground reference; exposed pad must be connected to system VEE plane for thermal dissipation and noise immunity. |
| GATE1–GATE12 | MOSFET Gate Drivers | 12 high-side gate outputs driving external N-channel MOSFETs; each supports fast pull-down (65mA) and 11–14V on-voltage. |
| SENSE1–SENSE12 | Current Sense Inputs | Differential inputs referenced to VSSKx; measure voltage across 0.1Ω sense resistor for precise per-port current monitoring. |
| OUT1–OUT12 | PoE Channel Outputs | High-voltage output terminals connecting to Ethernet pairs; support up to 57V DC output per channel (Type 4). |
| CPA/CNA/DPA/DNA | Isolated Data Interface | Transformer-coupled clock/data transceiver pins enabling optocoupler-free communication with LTC9101-1. |
| PWRIN (Pin 55) | Main PoE Input Supply | Accepts 51–57V input for Type 2/3/4 operation; internal UVLO triggers at 8.2–9V to prevent brownout instability. |
Key Features
| Feature | Design Value |
|---|---|
| Per-port 14-bit current/power monitoring | Enables real-time power budgeting and fault diagnostics with 24.98 µV/LSB resolution and 1.967ms conversion period. |
| Transformer-isolated communication | Eliminates optocouplers and isolated 3.3V supply, reducing BOM count by ≥4 components and improving long-term reliability. |
| Proprietary multipoint PD detection | Provides immunity against false PD identification in noisy environments; distinguishes single/dual-signature PDs via connection check. |
| Programmable fast shutdown | Allows preselected ports to be shut down within microseconds using MSD input or I²C command, critical for thermal management. |
| ECC-protected eFlash and RAM | Ensures firmware and configuration integrity in mission-critical telecom infrastructure with error correction for bit-flip resilience. |
Applications
| Enterprise Switch Midspan | Industrial IoT Gateway |
|---|---|
Use Scenario: 48-port PoE midspan powering IP phones, wireless APs, and security cameras in office buildings. IC Role / Device Role / Timing Role: LTC9102AUKJ#PBF serves as the analog PSE front-end, executing IEEE 802.3bt detection/classification/timing sequences (tDET = 380–500ms, tDIS = 320–400ms) under LTC9101-1 host control. Use Value: Enables simultaneous powering of mixed-class PDs (Class 1–8) with per-port power capping and real-time current readback for energy-aware network management. | Use Scenario: Ruggedized PoE switch in factory automation, delivering power and data to sensors, PLC I/O modules, and vision systems. IC Role / Device Role / Timing Role: LTC9102AUKJ#PBF provides robust 2-pair and 4-pair power delivery with enhanced ESD tolerance and wide temperature operation (–40°C to +85°C). Use Value: Supports dual-signature PDs and autoclass functionality for accurate power negotiation in variable-load industrial environments. |
| Telecom Central Office PSE | Smart Building Controller |
Use Scenario: High-density PoE chassis in central office infrastructure powering remote radio units and small cells. IC Role / Device Role / Timing Role: LTC9102AUKJ#PBF handles up to 48 channels with ECC-protected configuration storage and transformer-isolated host interface for noise immunity. Use Value: Reduces thermal dissipation via low-RDS(ON) MOSFET support and 0.1Ω sense resistors, enabling higher port density without forced air cooling. | Use Scenario: Integrated building management system powering lighting controllers, access readers, and HVAC actuators over structured cabling. IC Role / Device Role / Timing Role: LTC9102AUKJ#PBF executes MPS maintenance (tMPS = 6µs, tDIS = 320–400ms) and fast disconnect (<75ms overcurrent response) to meet safety standards. Use Value: Ensures continuous power delivery during transient loads while preventing nuisance tripping via programmable current limits and inrush control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5984AEUI+T | Single-chip 48-port PSE controller with integrated MOSFET drivers; no external LTC9101-1 host required; lower channel count flexibility (max 48 ports, no dual-channel mode). | Targeted at compact, cost-sensitive midspans where full 802.3bt Type 4 support and dual-signature PD handling are not required. | Select MAX5984AEUI+T when minimizing component count and board space is prioritized over maximum power scalability and advanced diagnostics. |
| TPS23881RHB | 8-channel PSE controller with integrated 100V HotSwap™ FETs; supports up to 90W per port (802.3bt Type 5); requires external isolation for multi-port systems. | Designed for modular, scalable PSE systems using multiple TPS23881 devices; lacks native transformer-isolated communication, increasing BOM complexity. | Choose TPS23881RHB for high-power, modular designs needing >71.3W/port and integrated FET protection, accepting added isolation design effort. |
Compared with MAX5984AEUI+T and TPS23881RHB, the LTC9102AUKJ#PBF offers superior IEEE 802.3bt Type 4 compliance fidelity, transformer-isolated host interface reducing system-level noise susceptibility, and finer-grained 14-bit per-port monitoring - making it optimal for carrier-grade and enterprise infrastructure demanding deterministic timing and diagnostic depth.
Availability
LTC9102AUKJ#PBF is available at Aetrix Electronics and suitable for enterprise networking, industrial IoT gateways, and telecom central office PSE systems requiring stable component supply, long lifecycle support, and guaranteed traceability.
Supply support for LTC9102AUKJ#PBF 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC9102AUKJ#PBF belongs to Analog Devices' Power over Ethernet (PoE) PSE controller product line, engineered specifically for high-density, standards-compliant IEEE 802.3bt infrastructure requiring low thermal footprint, deterministic timing, and robust fault management.
FAQ
What is the primary function of the LTC9102AUKJ#PBF in a PoE system?
The LTC9102AUKJ#PBF is the analog front-end PSE controller in a two-chip chipset with the LTC9101-1 host. It directly manages gate drive, current sensing, and isolation-critical signaling for up to 48 PoE ports. Its core functions include IEEE 802.3bt-compliant detection, classification, power-on sequencing, maintain-power-signature timing, and per-port 14-bit current/power monitoring - all executed under LTC9101-1 supervision.
Does the LTC9102AUKJ#PBF require an external host controller to operate?
Yes, the LTC9102AUKJ#PBF must be used with the LTC9101-1 host controller. The LTC9102AUKJ#PBF handles analog signal paths and gate drive, while the LTC9101-1 provides I²C interface, register management, software-defined configuration, and system-level coordination. They communicate via transformer-isolated CPA/CNA/DPA/DNA signals, eliminating optocouplers.
What is the significance of the VEE-referenced architecture in the LTC9102AUKJ#PBF?
The LTC9102AUKJ#PBF uses a negative supply architecture where VEE is the analog ground reference (AGND–VEE up to 80V). This enables high-side sensing and gate drive relative to the PoE output rail, simplifying high-voltage MOSFET control and improving noise immunity. Pin 65 (exposed pad) is VEE and must be soldered to the PCB's VEE plane for thermal and electrical performance.
How does the LTC9102AUKJ#PBF achieve transformer-isolated communication without optocouplers?
The LTC9102AUKJ#PBF uses dedicated CPA/CNA (clock) and DPA/DNA (data) differential pins that connect through data transformers to corresponding pins on the LTC9101-1. This eliminates optocouplers and an isolated 3.3V supply, reducing BOM cost and improving reliability. The transformer-coupled interface maintains signal integrity while providing galvanic isolation between the analog and digital domains.
What are the key thermal specifications for the LTC9102AUKJ#PBF package?
The LTC9102AUKJ#PBF uses a 64-lead 7mm × 11mm plastic QFN (UKJ) package with θJA = 22°C/W and θJC = 1°C/W. Its exposed VEE pad (Pin 65) must be soldered to the PCB for effective heat transfer. Operating junction temperature is rated from –40°C to +125°C, with ambient operation specified from –40°C to +85°C - critical for fanless enterprise and industrial deployments.
LTC9102AUKJ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Controller (PSE)
- Number of Channels:
- 48
- Power - Max:
- 71.3 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE), 802.3bt
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 11mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-QFN (7x11)
LTC9102AUKJ#PBF FAQ
1.How can I place an order for LTC9102AUKJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC9102AUKJ#PBF 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 LTC9102AUKJ#PBF reliable?
The price and inventory of LTC9102AUKJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC9102AUKJ#PBF is usually 5 days.
3.What payment methods are accepted for LTC9102AUKJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC9102AUKJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC9102AUKJ#PBF?
LTC9102AUKJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC9102AUKJ#PBF 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 LTC9102AUKJ#PBF?
For technical support, including LTC9102AUKJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC9102AUKJ#PBF requirements.
6.How does Aetrix verify that LTC9102AUKJ#PBF is sourced from the original manufacturer or authorized distributors?
All LTC9102AUKJ#PBF 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 LTC9102AUKJ#PBF meets industry standards.
7.What is the process for return or replacement of LTC9102AUKJ#PBF?
All LTC9102AUKJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC9102AUKJ#PBF, 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 LTC9102AUKJ#PBF part is unused and in its original packaging.
Return procedure for LTC9102AUKJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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