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Analog Devices Inc. LTC4267IGN-1#TRPBF
- Part No.:
- LTC4267IGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4267IGN-1#TRPBF.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,881
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Product details
Overview
LTC4267IGN-1#TRPBF from Analog Devices (formerly Linear Technology) is an IEEE 802.3af-compliant Powered Device (PD) interface IC with integrated current-mode flyback switching regulator. It delivers up to 13W of isolated or nonisolated 3.3V/1.5A power, features dual-level inrush current limiting (90–450mA), 25kΩ signature resistance, and thermal overload protection. It serves as the complete front-end power manager for PoE-powered endpoints such as IP phones and security cameras.
For engineers reviewing the LTC4267IGN-1#TRPBF datasheet, LTC4267IGN-1#TRPBF pinout, LTC4267IGN-1#TRPBF application, or LTC4267IGN-1#TRPBF equivalent, key selection criteria include IEEE 802.3af Class 2/3 compliance, –40°C to +85°C industrial temperature range, 16-pin SSOP package, integrated 100V UVLO switch, and programmable classification current via RCLASS resistor.
Technical Context
The LTC4267IGN-1#TRPBF integrates two functionally distinct blocks: a PD interface controller handling detection (25kΩ signature), classification (programmable 0–4 class current), UVLO (–36.0V turn-on / –30.5V turn-off), and dual-level input current limiting (90mA low / 450mA high); and a current-mode flyback regulator with 200kHz fixed-frequency operation, soft-start (1.4ms), programmable slope compensation, and onboard error amplifier referenced to 0.800V feedback voltage.
Its architecture supports both legacy and IEEE-compliant Power Sourcing Equipment (PSE): the low-level inrush limit enables safe charging of large output capacitors without violating IEEE 802.3af transient limits, while the high-level limit permits full Class 3 power delivery. All PD interface voltages are referenced to VPORTP, while regulator signals (e.g., VFB, NGATE) reference PGND-requiring explicit POUT-to-PGND tie.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Standard | Complies with IEEE 802.3af Powered Device (PD) specification for detection, classification, and power application. |
| Signature Resistance | 23.25–26.00kΩ - precision trimmed and temperature-compensated to meet IEEE ΔV/ΔI measurement requirements with diode bridge compensation. |
| Input Current Limit | Low level: 90–205mA; high level: 350–450mA - dual-stage inrush control prevents PSE overcurrent tripping during capacitor charging. |
| UVLO Thresholds | Turn-on: –36.0V; turn-off: –30.5V (with respect to VPORTP) - hysteresis prevents oscillation during marginal input conditions. |
| Regulator Feedback Voltage | 0.780–0.812V - precise internal reference enables accurate output regulation in isolated/nonisolated topologies without external components. |
| Oscillator Frequency | 180–240kHz - fixed-frequency current-mode control minimizes EMI and ensures stable light-load operation. |
| Thermal Shutdown | 140°C - protects internal 100V MOSFET and regulator under sustained overload or poor heatsinking. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), –40°C to +85°C operating temperature range, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1,8,9,16) | Switching regulator negative supply rail | Must be tied directly to POUT; serves as return path for regulator current and sense reference. |
| ITH/RUN (2) | Error amplifier compensation & run/shutdown control | Voltage <0.28V disables regulator; used for loop compensation and soft-start timing. |
| NGATE (3) | N-channel MOSFET gate driver output | Drives external 6V-rated N-MOSFET; rail-to-rail swing from PGND to PVCC. |
| PVCC (4) | Regulator positive supply | Internally clamped to 9.4V; requires local 4.7µF ceramic decoupling to PGND. |
| RCLASS (5) | Classification current programming input | Resistor to VPORTN sets class-specific load current (e.g., 68.1Ω = Class 2, 18.5mA). |
| NC (6) | No internal connection | Not bonded; must remain unconnected. |
| VPORTN (7) | Negative PD input port | Accepts –1.5V to –57V (vs VPORTP); connects to negative side of diode bridge. |
| POUT (10) | Power output / internal MOSFET drain | Delivers regulated power to PGND and loads; current-limited, high-impedance until UVLO turn-on. |
| PWRGD (11) | Open-drain power good signal | Low when PD MOSFET is on and regulator ready; referenced to VPORTN; high-impedance during detection/classification. |
| SIGDISA (12) | Signature disable control | Tie to VPORTP to reduce signature to invalid 9–11.8kΩ and disable all PD functions. |
| VPORTP (13) | Positive PD input port | Return path for input power; connects to positive side of diode bridge. |
| SENSE (14) | Current sense & slope compensation input | Monitors MOSFET current via external sense resistor; injects ramp for duty-cycle-dependent slope compensation. |
| VFB (15) | Feedback input | Compares output voltage divider to 0.800V reference; determines regulation setpoint for isolated/nonisolated designs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25kΩ signature resistor | Temperature-compensated, diode-bridge-aware resistance meets IEEE 802.3af ΔV/ΔI detection spec without external components. |
| Dual-level input current limiting | Enables safe start-up into large output capacitance (low-level 90–205mA) while supporting full Class 3 power (high-level 350–450mA). |
| Onboard 100V UVLO switch | Eliminates need for external high-voltage MOSFET; low-leakage design preserves signature integrity during detection. |
| Programmable classification current | Resistor-selectable Class 0–4 compliance (e.g., 45.3Ω for Class 3, 28mA) enables precise PSE power allocation. |
| Thermal overload protection | Shuts down regulator at 140°C junction temperature; prevents damage during sustained overload or repeated power cycling. |
Applications
| IP Phone Power Management | Wireless Access Point |
|---|---|
Use Scenario: Powering VoIP handsets with Ethernet backhaul, requiring reliable 3.3V/1.5A supply and IEEE 802.3af interoperability. IC Role / Device Role / Timing Role: PD interface controller and primary DC/DC converter delivering regulated output from PoE source. Use Value: Eliminates discrete signature resistor, classification circuitry, and external regulator controller-reducing BOM count by ≥8 components. |
Use Scenario: Providing primary power to dual-band 802.11ac access points deployed in ceiling-mounted enclosures with limited airflow. IC Role / Device Role / Timing Role: Front-end PD manager enabling Class 3 power negotiation and thermally robust 13W delivery. Use Value: Dual-level current limiting avoids PSE shutdown during hot-plug events; thermal shutdown protects against enclosure overheating. |
| Security Camera System | Industrial IoT Sensor Node |
Use Scenario: Powering outdoor PTZ cameras with IR illumination, requiring stable 3.3V rail and immunity to voltage transients on long Ethernet runs. IC Role / Device Role / Timing Role: IEEE 802.3af-compliant PD interface with integrated regulator and UVLO hysteresis. Use Value: –40°C to +85°C rating ensures operation in unconditioned environments; 100V UVLO switch withstands induced surges. |
Use Scenario: Enabling remote sensor aggregation nodes powered solely via PoE, with minimal PCB area and no external heatsink. IC Role / Device Role / Timing Role: Compact PD solution integrating signature, classification, and flyback control in 16-pin SSOP. Use Value: Low-profile SSOP package saves >30% board space vs discrete solutions; integrated error amplifier removes need for external op-amp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device (PD) interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4275IMS#PBF | IEEE 802.3at (PoE+) compatible; supports up to 25.5W; includes I²C interface for advanced monitoring; no integrated regulator. | Requires external DC/DC converter; suited for higher-power systems needing telemetry and dynamic power management. | Select LT4275IMS#PBF when upgrading to PoE+ or requiring digital configuration; LTC4267IGN-1#TRPBF remains optimal for cost-sensitive, fixed-output 13W designs. |
| TPS23753APWPR | TI device with integrated 3.3V/0.5A LDO (not switching regulator); supports IEEE 802.3af only; lower max output current. | Limited to low-power peripherals; lacks flyback capability for isolated outputs or higher current demands. | Choose TPS23753APWPR for simple, low-current auxiliary rails; LTC4267IGN-1#TRPBF is required for 1.5A switching output and full Class 3 power. |
Compared with LT4275IMS#PBF and TPS23753APWPR, the LTC4267IGN-1#TRPBF uniquely combines IEEE 802.3af compliance, integrated flyback controller, and industrial temperature range in a single SSOP package-making it the most compact, self-contained solution for 13W PoE endpoints without digital interface needs.
Availability
LTC4267IGN-1#TRPBF is available at Aetrix Electronics and suitable for IP phone power management, wireless access point designs, security camera systems, and industrial IoT sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for LTC4267IGN-1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC4267 family was designed specifically for IEEE 802.3af Power over Ethernet endpoints, integrating PD interface logic and flyback regulation to minimize external components and simplify PoE adoption in space-constrained, thermally demanding applications.
FAQ
What is the operating temperature range of the LTC4267IGN-1#TRPBF?
The LTC4267IGN-1#TRPBF is rated for –40°C to +85°C ambient operation, matching the "I" grade designation in its part number. This industrial temperature range ensures reliable performance in unconditioned environments such as outdoor security cameras or ceiling-mounted wireless access points where ambient temperatures exceed commercial-grade limits.
Does the LTC4267IGN-1#TRPBF include an integrated DC/DC converter?
Yes, the LTC4267IGN-1#TRPBF integrates a current-mode flyback switching regulator controller-not a complete converter. It drives an external N-channel MOSFET and requires external transformer, rectifier, and output filter components. The IC provides soft-start, slope compensation, error amplifier, and 0.800V reference to enable fully regulated isolated or nonisolated 3.3V outputs up to 1.5A.
How does the LTC4267IGN-1#TRPBF support IEEE 802.3af classification?
The LTC4267IGN-1#TRPBF supports IEEE 802.3af Classes 0–4 via the RCLASS pin: connecting a precision resistor (e.g., 68.1Ω for Class 2) between RCLASS and VPORTN programs the classification current (18.5mA nominal). During PSE classification probing (–15.5V to –20.5V), the IC sources this exact current from VPORTP, enabling accurate power allocation without external circuitry.
Can the LTC4267IGN-1#TRPBF be used with legacy (non-IEEE) Power Sourcing Equipment?
Yes, the LTC4267IGN-1#TRPBF is explicitly designed for interoperability with legacy PSEs. Its dual-level current limiting-starting at 90–205mA during inrush-prevents tripping of older PSEs lacking IEEE 802.3af's strict inrush specifications. Once powered, it transitions to high-level limiting (350–450mA) to deliver full Class 3 power if an IEEE-compliant PSE is present.
What is the purpose of the SIGDISA pin on the LTC4267IGN-1#TRPBF?
The SIGDISA pin disables the internal 25kΩ signature resistor. When pulled high (≥3V) with respect to VPORTN-or tied to VPORTP-the signature resistance drops to 9–11.8kΩ, an invalid value per IEEE 802.3af. This prevents PSE detection and powers down all PD functions, enabling controlled wake-up or system-level power sequencing in multi-PD installations.
LTC4267IGN-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 12.95 W
- Internal Switch(s):
- No
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 57V (Max)
- Current - Supply:
- 3mA (Max)
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC4267IGN-1#TRPBF FAQ
1.How can I place an order for LTC4267IGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4267IGN-1#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 LTC4267IGN-1#TRPBF reliable?
The price and inventory of LTC4267IGN-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4267IGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4267IGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4267IGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4267IGN-1#TRPBF?
LTC4267IGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4267IGN-1#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 LTC4267IGN-1#TRPBF?
For technical support, including LTC4267IGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4267IGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC4267IGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4267IGN-1#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 LTC4267IGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4267IGN-1#TRPBF?
All LTC4267IGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4267IGN-1#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 LTC4267IGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4267IGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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