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Analog Devices Inc. LTC4263CDE#PBF
- Part No.:
- LTC4263CDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC4263CDE#PBF.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,195
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Product details
Overview
LTC4263CDE#PBF from Analog Devices (formerly Linear Technology) is a single-channel, fully autonomous IEEE 802.3af-compliant Power Sourcing Equipment (PSE) controller with integrated power MOSFET, precision detection/classification circuitry, and selectable AC/DC disconnect sensing. It operates from a single –48V supply, delivers up to 15.4W per port, and supports class-dependent current limiting (e.g., 375mA for Class 0/3/4, 175mA for Class 2). It is used in midspan or endpoint PoE injectors powering IP phones, wireless access points, and IoT edge devices.
For engineers reviewing the LTC4263CDE#PBF datasheet, LTC4263CDE#PBF pinout, LTC4263CDE#PBF application, or LTC4263CDE#PBF equivalent, key selection criteria include IEEE 802.3af compliance assurance, internal MOSFET RON ≤ 2.4 Ω at 350mA, programmable multi-port power management via PWRMGT pin, and robust fault protection including foldback current limit (30–180mA), high-speed fault limit (500–800mA), and thermal shutdown.
Technical Context
The LTC4263CDE#PBF implements full IEEE 802.3af signature detection using dual-point force-current measurement to reject legacy NICs (150Ω) and validate PDs with 17–29.7kΩ signature resistance. Classification occurs at 18V (typ) with current thresholds per IEEE classes (e.g., 21.5–24.5mA for Class 2–3), and enforcement of class-specific ICUT thresholds is enabled by the ENFCLS pin.
Its autonomous operation eliminates microcontroller dependency: onboard algorithms handle detection timing (tDET = 270–310ms), classification duration (34–39ms), power-on delay (135–155ms), and disconnect response (tMPDO = 320–380ms for DC, ACOUT-based for AC mode). The OSC pin controls AC disconnect frequency (103–115Hz) and enables capacitor-based PD presence monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3af for endpoint/midspan PSE operation, including detection, classification, and maintain-power-signature (MPS) timing. |
| VDD48 Supply Range | 33V to 66V input range ensures stable operation across 48V supply tolerances and cable drop; UVLO turn-off at 29–33V prevents brownout misoperation. |
| Internal MOSFET RON | 1.5–3.0 Ω typical on-resistance minimizes conduction loss and thermal rise during 350mA continuous output. |
| ICUT Threshold | Class-dependent overload current limit: 355–395mA (Class 0/3/4), 165–185mA (Class 2), 95–105mA (Class 1); configurable via ENFCLS pin. |
| Power Management | PWRMGT pin sources –17.9 to –75.6μA proportional to PD class, enabling shared RC-network allocation across multiple LTC4263 ports without host processor. |
| LED Drive | Open-drain LED pin pulses at 6% duty cycle when powered from 48V, enabling efficient inductor-diode LED drive with minimal heat dissipation. |
| Package | 14-lead 4mm × 3mm DFN (DE package) with exposed VSS pad for thermal relief; rated for 0°C to 70°C ambient operation. |
Pinout & Package
Package: 14-lead (4mm × 3mm) plastic DFN with exposed VSS pad (Pin 15), rated for 0°C to 70°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED (1) | Open-drain port status indicator | Pulled low during normal operation; flashes diagnostic codes for faults (e.g., short, invalid signature); supports efficient 48V LED drive via pulsed 6% duty cycle. |
| LEGACY (2) | Legacy PD detection mode control | High = enable large-capacitor legacy detect; low = IEEE-only mode; floating = force-power-on mode for nonstandard PDs (non-compliant). |
| MIDSPAN (3) | Midspan backoff timing enable | High = 3.2s delay after failed detection (except open-circuit); low = immediate retry; ensures coexistence with endpoint PSEs. |
| PWRMGT (4) | Multi-port power allocation node | Sources class-proportional current (–17.9 to –75.6μA) to shared RC network; port disabled if voltage >1V, preventing over-allocation. |
| VSS (5,6) | Negative 48V return / ground reference | Common return for all internal circuits; Pins 5 and 6 must be tied together on PCB; exposed pad (Pin 15) is also VSS. |
| OSC (7) | AC disconnect oscillator control | Connect 0.1μF X7R cap to VSS for AC disconnect; tie to VSS to disable AC and enable DC disconnect only. |
| ACOUT (8) | AC disconnect sense output | Monitors port capacitance decay; triggers disconnect if <0.15μF sustained >tMPDO (320–380ms); requires 1kΩ + 0.47μF series RC to port. |
| OUT (9,10) | Main 48V power delivery path | Drives port through internal MOSFET; pins tied together on PCB; withstands 80V transient and 80mA sink current regardless of power state. |
| VDD48 (11) | 48V supply input | Bypassed with 0.1μF capacitor to VSS; absolute max rating –80V ensures robustness against surge events. |
| SD (12) | Global shutdown control | Pull low to disable detection and power; releases after 4s delay before resuming port cycling; enables system-level fault isolation. |
| ENFCLS (13) | Class-enforced current limit enable | High = reduce ICUT to class-specific threshold (e.g., 175mA for Class 2); low = fixed 375mA limit for all classes. |
| VDD5 (14) | Logic supply / internal regulator input | Accepts external 5V or enables internal regulator via 0.1μF bypass; internal VDD5 = 4.3–4.5V ensures stable digital core operation. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous IEEE 802.3af compliance | Full detection, classification, power application, and disconnect sequencing implemented in hardware-no firmware or host processor required. |
| Integrated power MOSFET with thermal protection | On-resistance ≤2.4 Ω reduces I²R losses; built-in thermal shutdown prevents damage during sustained overload or poor heatsinking. |
| Programmable multi-port power management | PWRMGT pin current scales with PD class; RC network sharing allows dynamic allocation of total 48V supply capacity across ≥2 LTC4263 ports. |
| Robust fault protection architecture | Three-tier current limiting: high-speed fault (500–800mA), short-circuit (405–445mA), and foldback (30–180mA) prevent damage during transients and sustained faults. |
| Selectably configurable disconnect sensing | Pin-strapped choice between AC disconnect (capacitance decay monitoring) and DC disconnect (current threshold), supporting both endpoint and midspan topologies. |
Applications
| IP Telephony Infrastructure | Wireless Access Point Powering |
|---|---|
Use Scenario: Powering VoIP desk phones and conference units in enterprise LAN closets using existing Cat 5e/6 cabling. IC Role / Device Role / Timing Role: Acts as standalone endpoint PSE controlling single PoE port; performs IEEE 802.3af detection (270–310ms), classification (34–39ms), and MPS maintenance (20ms pulse width, 350ms disconnect delay). Use Value: Eliminates need for local AC adapters; supports hot-swap insertion/removal with automatic re-detection; LED pin provides real-time port status and fault diagnostics. |
Use Scenario: Midspan PoE injectors supplying 48V to ceiling-mounted Wi-Fi 5/6 APs in retail, hospitality, and education environments. IC Role / Device Role / Timing Role: Functions as midspan PSE with backoff timing (3.2s delay after failed detection); uses AC disconnect to monitor AP capacitor health and prevent false disconnects during RF bursts. Use Value: Enables reliable remote powering over long cable runs; PWRMGT-based power sharing allows up to 8 ports on one 48V/30A supply without oversubscription. |
| Industrial IoT Edge Gateways | Smart Building Sensor Hubs |
Use Scenario: Powering ruggedized gateways connecting Modbus, CAN, and LoRaWAN field devices to Ethernet backbone in factory automation. IC Role / Device Role / Timing Role: Provides isolated 48V power with DC disconnect for legacy industrial PDs; LEGACY pin set to VSS enforces strict IEEE compliance while SD pin enables centralized fault shutdown. Use Value: Internal MOSFET RON ≤2.4 Ω ensures <1.2W conduction loss at 350mA, reducing thermal load in sealed enclosures; wide –48V supply range accommodates 10% line sag. |
Use Scenario: Distributed sensor hubs powering temperature, occupancy, and air quality sensors in HVAC ducts and lighting fixtures. IC Role / Device Role / Timing Role: Operates as low-port-count standalone PSE; uses ENFCLS pin to enforce Class 2 current limits (165–185mA) on sensor clusters, preventing overcurrent on marginal wiring. Use Value: Foldback current limit (30–180mA) protects against partial shorts in damp environments; LED blink patterns identify specific fault types (e.g., signature failure vs. short circuit) for rapid field troubleshooting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23753APWPR | Single-channel IEEE 802.3af PSE controller with external MOSFET drive; no integrated FET; requires external gate driver and sense resistor. | Requires additional BOM components (MOSFET, current sense, gate resistor); better suited for high-efficiency discrete designs where thermal management is critical. | Select TPS23753APWPR when board space allows discrete FET placement and higher efficiency (>92%) is prioritized over integration. |
| MAX5941AEUP+ | Single-channel 802.3af PSE with integrated FET but no multi-port power management; fixed 375mA ICUT; no AC disconnect option. | Lacks PWRMGT-based power sharing and AC disconnect sensing; limited to basic endpoint applications without scalability or advanced disconnect modes. | Select MAX5941AEUP+ only for cost-sensitive, single-port endpoint designs where power budgeting and AC disconnect are unnecessary. |
Compared with TPS23753APWPR and MAX5941AEUP+, the LTC4263CDE#PBF uniquely integrates MOSFET, AC/DC disconnect selection, and scalable multi-port power management in a compact DFN-reducing component count by ≥7 parts and enabling flexible deployment from single-port injectors to 16-port chassis systems.
Availability
LTC4263CDE#PBF is available at Aetrix Electronics and suitable for IP telephony infrastructure, wireless access point powering, and industrial IoT edge gateways requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC4263CDE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4263 belongs to Linear's Power over Ethernet (PoE) PSE controller product line, designed specifically for autonomous, standards-compliant power injection into IEEE 802.3af networks with minimal external components and no software overhead.
FAQ
What is the operating temperature range for the LTC4263CDE#PBF?
The LTC4263CDE#PBF is specified for an ambient operating temperature range of 0°C to 70°C. This 'C' grade variant is intended for commercial and indoor industrial applications where ambient conditions remain within this envelope. Its thermal design-featuring an exposed VSS pad in the 4mm × 3mm DFN package-supports reliable operation at full load under natural convection cooling.
Does the LTC4263CDE#PBF require an external microcontroller to function?
No, the LTC4263CDE#PBF operates fully autonomously without any microcontroller. All IEEE 802.3af functions-including dual-point signature detection, classification current measurement, power application timing, MPS maintenance, and fault recovery-are implemented in dedicated analog and digital circuitry. The device only requires a single –48V supply and minimal passive components to deliver compliant PoE.
How does the LTC4263CDE#PBF implement multi-port power management?
The LTC4263CDE#PBF implements multi-port power management via its PWRMGT pin, which sources a class-proportional current (e.g., –72.3μA for Class 0/3/4, –32.8μA for Class 2) into a shared RC network. When multiple LTC4263CDE#PBF devices connect their PWRMGT pins to the same node, the resulting voltage reflects total allocated power; any port attempting to exceed the supply's full-load capability sees >1V at PWRMGT and remains disabled.
Can the LTC4263CDE#PBF support both endpoint and midspan PSE topologies?
Yes, the LTC4263CDE#PBF supports both endpoint and midspan topologies. Endpoint operation is default; midspan mode is enabled by pulling the MIDSPAN pin high, which activates a 3.2-second detection backoff delay after failed cycles-ensuring interoperability with endpoint PSEs on the same cable segment per IEEE 802.3af requirements.
What protection features does the LTC4263CDE#PBF provide against port faults?
The LTC4263CDE#PBF provides layered fault protection: high-speed current limiting (500–800mA) responds within microseconds to hard shorts; short-circuit current limiting (405–445mA) sustains longer faults; foldback current limiting (30–180mA) reduces power dissipation during sustained overloads; plus thermal shutdown and UVLO/OVLO monitoring on the 48V rail-all without external intervention.
LTC4263CDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Controller (PSE)
- Number of Channels:
- 1
- Power - Max:
- 15.4 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 33V ~ 66V
- Current - Supply:
- 2mA
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x3)
LTC4263CDE#PBF FAQ
1.How can I place an order for LTC4263CDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4263CDE#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 LTC4263CDE#PBF reliable?
The price and inventory of LTC4263CDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4263CDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC4263CDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4263CDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4263CDE#PBF?
LTC4263CDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4263CDE#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 LTC4263CDE#PBF?
For technical support, including LTC4263CDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4263CDE#PBF requirements.
6.How does Aetrix verify that LTC4263CDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4263CDE#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 LTC4263CDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC4263CDE#PBF?
All LTC4263CDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4263CDE#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 LTC4263CDE#PBF part is unused and in its original packaging.
Return procedure for LTC4263CDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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