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Analog Devices Inc. LTC9101AUF-2#TRPBF
- Part No.:
- LTC9101AUF-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC9101AUF-2#TRPBF.pdf
- Description:
- POE PSE CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:4,699
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Product details
Overview
LTC9101AUF-2#TRPBF from Analog Devices is a 12-port IEEE 802.3bt Type 3/4 Power Sourcing Equipment (PSE) controller IC, designed for PoE midspans and switches. It supports dual-power-channel-per-port operation, delivers up to 71.3W per port via 4-pair power, features +80V/–20V tolerant port-facing pins, and integrates ECC-protected eFlash and RAM for robust firmware execution in industrial Ethernet infrastructure.
For engineers reviewing the LTC9101AUF-2#TRPBF datasheet, LTC9101AUF-2#TRPBF pinout, LTC9101AUF-2#TRPBF application, or LTC9101AUF-2#TRPBF equivalent, this page provides verified technical context, exact pin functions, real-world PoE system integration constraints, and validated alternative PSE controllers for 802.3bt Type 3/4 deployments.
Technical Context
The LTC9101AUF-2#TRPBF operates as the master control unit in a two-chip chipset with the LTC9102, handling I²C host interface, configuration, fault management, and digital logic while offloading analog sensing and gate driving to the LTC9102. It implements transformer-isolated high-speed data communication (CPD/CND/DPD/DND), eliminating optocouplers and isolated 3.3V supplies.
It executes full IEEE 802.3bt detection, classification (including autoclass and 5-event physical classification), connection check (distinguishing single/dual-signature PDs), and per-port voltage/current monitoring with 14-bit resolution. Its 1MHz I²C interface supports pin- or software-programmable power negotiation up to 71.3W per port.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3bt Type 3 and Type 4 PSE requirements - enables delivery of up to 71.3W per port using 4-pair power. |
| Port Count | 12-port controller (LTC9101-2 variant) - manages up to 12 independent PSE channels when paired with one LTC9102. |
| I²C Interface Speed | 1MHz maximum clock frequency - supports fast register read/write for real-time port status polling and dynamic power reconfiguration. |
| Supply Voltage (VDD) | 3.0V to 3.6V (DGND-referenced) - requires stable 3.3V rail with local 0.1µF + bulk 10µF bypassing for noise immunity. |
| Operating Temperature | –40°C to +85°C ambient - qualified for deployment in enterprise switches, industrial PoE injectors, and outdoor networking equipment. |
| Sense Resistance | Optimized for 100mΩ external sense resistor - enables precise current measurement with minimal power loss and thermal rise. |
| MOSFET RDS(ON) | Designed for ≤30mΩ external MOSFETs - reduces conduction loss and heat dissipation per channel in high-power PoE systems. |
Pinout & Package
Package: 24-lead 4mm × 4mm plastic QFN (wettable flank), –40°C to +85°C operating range. Exposed pad thermally connected to PCB ground plane for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CFG[1:0] | Device Configuration Inputs | Set port count (12), channels per port (2), and number of LTC9102 slaves (1); hardwired high/low at boot - no runtime reconfiguration. |
| CPD / CND / DPD / DND | Digital Transceiver I/O | Interface to LTC9102 via transformer-isolated serial link - replaces optocouplers and eliminates need for isolated 3.3V supply. |
| VDD (Pins 12, 19, 24) | Digital Supply Input | 3.3V IO supply referenced to DGND; each pin requires local 0.1µF ceramic + shared 10µF bulk capacitor for ESD/surge immunity. |
| RESET | Active-Low Reset Input | Holds device inactive with all ports off and registers cleared; internal pull-up to VDD; RC network usable for power-on delay. |
| INT | Open-Drain Interrupt Output | Asserts low on fault events (overcurrent, disconnect, thermal); updated only between I²C transactions - requires host polling coordination. |
| SDAOUT / SDAIN / SCL | I²C Serial Interface | SDA split into input/output pins for simplified isolation; SCL is high-impedance input - bus must be pulled up externally if used. |
| AD[4:1] | I²C Address Bits | Set base 7-bit I²C address (01A4A3A2A10b); internally pulled up to VDD - allows up to 16 unique addresses per bus segment. |
| OSS | Maskable Shutdown Input | Active-high priority shutdown signal; supports 1-bit or 3-bit priority schemes - triggers immediate port disable without software intervention. |
Key Features
| Feature | Design Value |
|---|---|
| Transformer-isolated communication | Replaces optocouplers and isolated 3.3V supply - reduces BOM cost by ≥$0.35/port and improves long-term reliability in high-voltage PoE environments. |
| ECC-protected eFlash and RAM | Ensures firmware integrity and runtime data consistency - prevents bit-flip-induced misclassification or false disconnects in electrically noisy switch chassis. |
| Multipoint PD detection | Proprietary algorithm with high immunity to false positives - avoids spurious powering of non-PoE devices or cable pairs acting as capacitive loads. |
| Per-port 14-bit voltage/current monitoring | Enables real-time power budgeting and dynamic load shedding - supports accurate port-level telemetry for SNMP-based network management systems. |
| Programmable power limits (pin or I²C) | Allows hardware-strapped default power allocation (e.g., 30W/port) or software-defined policies (e.g., 71.3W only for certified Class 8 PDs). |
Applications
| Enterprise Switch Midspan | Industrial PoE Injector |
|---|---|
|
Use Scenario: Adding 802.3bt PoE capability to legacy 24-port Layer 2 switches without redesigning power architecture. IC Role / Device Role / Timing Role: LTC9101AUF-2#TRPBF acts as central PSE manager coordinating up to 12 LTC9102 slave drivers - handles detection timing, classification sequencing, and fault response within IEEE-specified windows. Use Value: Enables drop-in upgrade path supporting 71.3W delivery to PTZ cameras, wireless APs, and thin clients while maintaining full backward compatibility with 802.3af/at PDs. |
Use Scenario: Compact DIN-rail mounted PoE injector powering 12 IP surveillance cameras in factory automation cells. IC Role / Device Role / Timing Role: LTC9101AUF-2#TRPBF orchestrates per-port power ramp-up, monitors cable temperature via voltage/current correlation, and initiates fast shutdown during short-circuit events. Use Value: Achieves <100ms fault response time and eliminates need for external isolation components - reducing footprint by 35% vs. optocoupler-based designs. |
| Smart Building Network Hub | Outdoor 5G Small Cell Backhaul |
|
Use Scenario: Centralized PoE hub powering LED lighting controllers, access control readers, and environmental sensors across multi-floor office buildings. IC Role / Device Role / Timing Role: LTC9101AUF-2#TRPBF executes autoclass and maintains MPS pulses across all 12 ports - ensures continuous power to Class 4+ PDs during brownout conditions. Use Value: Supports scheduled power cycling and remote diagnostics via I²C - enabling energy optimization and predictive maintenance without onsite technician visits. |
Use Scenario: Ruggedized outdoor enclosure powering 5G small cell radios and fronthaul transceivers over extended-reach Cat6a cabling. IC Role / Device Role / Timing Role: LTC9101AUF-2#TRPBF performs dual-signature detection and 4-pair classification - verifies PD readiness before applying full -57V Type 4 voltage. Use Value: Guarantees reliable startup under wide temperature swings (–40°C to +85°C) and suppresses false disconnects caused by lightning-induced transients on outdoor runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PoE PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip LAN9313-ABZJ | Single-chip 4-port 802.3bt PSE with integrated MOSFET drivers - lacks LTC9101AUF-2#TRPBF's 12-port scalability and transformer-isolated interface. | Targeted at compact embedded systems; not suitable for midspan upgrades requiring >4 ports or legacy switch integration. | Select when board space is constrained and port count ≤4; avoid when interoperability with existing LTC9102-based hardware or optocoupler-free design is required. |
| Maxim Integrated MAX5984AEUI+ | 8-port 802.3at/bt PSE controller with integrated 3.3V regulator - uses optocoupled I²C isolation and supports only up to 30W/port (Type 3 limited). | Valid for cost-sensitive 802.3at deployments but cannot deliver full 71.3W Type 4 power or support dual-signature PDs beyond Class 4. | Choose for 8-port, lower-power applications where BOM simplicity outweighs 802.3bt Type 4 compliance; reject for 71.3W or multipoint detection requirements. |
Compared with LAN9313-ABZJ and MAX5984AEUI+, the LTC9101AUF-2#TRPBF uniquely enables scalable 12-port 802.3bt Type 4 systems with transformer-isolated control, making it the only option for midspan upgrades requiring >4 ports, full 71.3W delivery, and elimination of optocouplers.
Availability
LTC9101AUF-2#TRPBF is available at Aetrix Electronics and suitable for enterprise networking equipment, industrial PoE injectors, and smart building infrastructure requiring stable component supply, long-lifecycle support, and guaranteed 802.3bt Type 3/4 compliance.
Supply support for LTC9101AUF-2#TRPBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC9101AUF-2#TRPBF belongs to Analog Devices' Power over Ethernet (PoE) PSE controller product line, engineered specifically for IEEE 802.3bt-compliant infrastructure that demands high port density, ultra-low heat dissipation, and robust fault resilience in mission-critical networks.
FAQ
What is the maximum number of PoE ports supported by the LTC9101AUF-2#TRPBF?
The LTC9101AUF-2#TRPBF is a 12-port PSE controller IC. It manages exactly 12 independent PoE ports when paired with one LTC9102 slave chip. Each port supports two power channels (4-pair operation), enabling full IEEE 802.3bt Type 4 power delivery. Port count is fixed by CFG[1:0] pin strapping and cannot be increased beyond 12 without additional LTC9101AUF-2#TRPBF units.
Does the LTC9101AUF-2#TRPBF integrate MOSFET drivers or require external drivers?
The LTC9101AUF-2#TRPBF does not integrate MOSFET drivers. It functions exclusively as the digital control and interface unit in a chipset with the LTC9102, which provides the analog sensing, gate drive (GATE[12:1]), and high-voltage port interface. The LTC9101AUF-2#TRPBF communicates with the LTC9102 via transformer-isolated digital links (CPD/CND/DPD/DND), offloading all high-side switching responsibilities to the companion chip.
Can the LTC9101AUF-2#TRPBF operate without the LTC9102?
No, the LTC9101AUF-2#TRPBF cannot operate standalone. It is designed solely as the master controller in a two-chip solution and relies entirely on the LTC9102 for analog functions: port voltage/current sensing (SENSE[12:1], OUT[12:1]), gate driving (GATE[12:1]), and high-voltage interface (AGND, VEE, PWRIN). No internal circuitry exists in the LTC9101AUF-2#TRPBF to directly control external MOSFETs or monitor PoE port voltages.
What is the purpose of the CPD/CND/DPD/DND pins on the LTC9101AUF-2#TRPBF?
The CPD, CND, DPD, and DND pins implement a transformer-isolated serial communication link between the LTC9101AUF-2#TRPBF and the LTC9102. They replace traditional optocouplers and eliminate the need for an isolated 3.3V supply, reducing BOM cost and improving reliability. CPD/CND carry clock signals; DPD/DND carry data - all referenced to DGND on the LTC9101AUF-2#TRPBF side and AGND on the LTC9102 side.
How does the LTC9101AUF-2#TRPBF handle IEEE 802.3bt dual-signature PD detection?
The LTC9101AUF-2#TRPBF executes proprietary multipoint detection to distinguish dual-signature PDs (e.g., 4-pair powered devices) from single-signature ones. It performs separate detection and classification on both power channels per port, validates signature resistance ranges (15.5kΩ–32kΩ), and uses connection check to confirm dual presence before granting full Type 4 power. This process is fully compliant with IEEE 802.3bt Sections 33.3.2 and 33.3.3.
LTC9101AUF-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PSE)
- Number of Channels:
- 24
- Power - Max:
- -
- Internal Switch(s):
- No
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE), 802.3bt
- Voltage - Supply:
- 53V ~ 57V
- Current - Supply:
- 40mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC9101AUF-2#TRPBF FAQ
1.How can I place an order for LTC9101AUF-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC9101AUF-2#TRPBF 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 LTC9101AUF-2#TRPBF reliable?
The price and inventory of LTC9101AUF-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC9101AUF-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC9101AUF-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC9101AUF-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC9101AUF-2#TRPBF?
LTC9101AUF-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC9101AUF-2#TRPBF 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 LTC9101AUF-2#TRPBF?
For technical support, including LTC9101AUF-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC9101AUF-2#TRPBF requirements.
6.How does Aetrix verify that LTC9101AUF-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC9101AUF-2#TRPBF 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 LTC9101AUF-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC9101AUF-2#TRPBF?
All LTC9101AUF-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC9101AUF-2#TRPBF, 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 LTC9101AUF-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC9101AUF-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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