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Analog Devices Inc. LT4275BIMS#TRPBF
- Part No.:
- LT4275BIMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4275BIMS#TRPBF.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,480
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Product details
Overview
LT4275BIMS#TRPBF from Analog Devices (acquired Linear Technology) is an IEEE 802.3at-compliant Type 2 Powered Device (PD) controller for Power over Ethernet systems, delivering up to 25.5W at the RJ45 connector, featuring 100V absolute maximum input voltage, –40°C to 85°C operating junction temperature range, and integrated signature resistor for IEEE-compliant detection. It drives an external N-channel MOSFET via HSGATE/HSSRC interface in high-efficiency PD front-end designs for outdoor security cameras and industrial displays.
For engineers reviewing the LT4275BIMS#TRPBF datasheet, LT4275BIMS#TRPBF pinout, LT4275BIMS#TRPBF application, or LT4275BIMS#TRPBF equivalent, key selection criteria include IEEE 802.3at Type 2 classification compliance, 25.5W power delivery capability, MSOP-10 package with exposed pad thermal path, T2P open-drain PSE type indicator output, and AUX pin–enabled auxiliary supply override down to 9V.
Technical Context
The LT4275BIMS#TRPBF implements IEEE 802.3at two-event physical layer classification using RCLASS resistor programming (34.8Ω for Class 4), with T2P output actively pulled low to signal 25.5W PSE availability after successful classification. It uses internal charge pump gate drive to control external N-channel MOSFETs, eliminating need for P-channel devices while maintaining <31V hot-swap turn-off threshold and >35V turn-on threshold under IEEEUVLO = 0V configuration.
Its detection mode presents a precision 24.4kΩ signature resistance between VPORT and GND, compliant with IEEE 802.3af/at requirements, and transitions through classification, mark, and inrush phases before asserting PWRGD upon HSGATE reaching ~7V above HSSRC. The AUX pin enables auxiliary supply takeover at VAUXT = 6.3V with 5.8µA hysteresis current, disabling signature and classification when asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VPORT Operating Input Voltage | 23V to 60V - defines valid PoE port voltage range for powered-on operation |
| Max Delivered Power | 25.5W - IEEE 802.3at Type 2 compliance limit at RJ45 connector |
| Signature Resistance | 24.4kΩ ±0.7kΩ - precision, temperature-compensated value for IEEE detection |
| Hot Swap Turn-On/Off Thresholds | 35V/30V (IEEEUVLO = 0V) - ensures reliable power-up and brownout protection |
| Junction Temperature Range | –40°C to 85°C - specifies full operational range for commercial-grade MSOP package |
| T2P Output Function | Open-drain, pulled low for Type 2 PSE - provides direct hardware-level PSE type identification |
| AUX Threshold Voltage | 6.3V ±0.2V - sets auxiliary supply takeover point with 5.8µA hysteresis current |
Pinout & Package
LT4275BIMS#TRPBF is housed in a 10-lead plastic MSOP package (3mm × 3mm footprint, 0.5mm pitch) with exposed pad thermally connected to GND. Pin 11 (exposed pad) is GND and must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IEEEUVLO (Pin 1) | Hot swap UVLO control input | Grounding enables IEEE 802.3at-compliant 35V/30V turn-on/turn-off thresholds |
| AUX (Pin 2) | Auxiliary supply sense input | Asserting >6.3V disables classification, disconnects signature, pulls down HSGATE |
| RCLASS (Pin 3) | Classification resistor connection | 34.8Ω to GND configures Class 4 (25.5W) per IEEE 802.3at Table 1 |
| RCLASS++ (Pin 4) | LTPoE++ classification pin | No-connect on LT4275BIMS#TRPBF - reserved for LT4275A variants only |
| GND (Pin 5) | Power and signal reference | Primary ground return; exposed pad (not assigned pin number) is also GND |
| T2P (Pin 6) | PSE type indicator output | Open-drain output pulled low to signal 25.5W PSE presence after classification |
| PWRGD (Pin 7) | Power good status output | Open-drain output held low until HSGATE reaches ~7V above HSSRC |
| HSSRC (Pin 8) | External MOSFET source connection | Connects to source terminal of N-channel Hot Swap MOSFET |
| HSGATE (Pin 9) | External MOSFET gate driver | Charge-pump–driven output controlling gate voltage ramp during inrush |
| VPORT (Pin 10) | PoE input rail and MOSFET drain node | Accepts 23–60V PoE input; connects to drain of external N-channel MOSFET |
Key Features
| Feature | Design Value |
|---|---|
| N-channel MOSFET gate drive | Integrated charge pump eliminates P-channel FET, reducing BOM cost and conduction loss |
| IEEE 802.3at Type 2 compliance | Validated 25.5W delivery with two-event classification and T2P signaling |
| Programmable auxiliary supply override | AUX pin enables seamless transition to 9–60V auxiliary input with hysteresis control |
| Thermal protection | Automatic HSGATE/PWRGD shutdown above 150°C junction temperature |
| Integrated signature resistor | 24.4kΩ ±0.7kΩ trimmed resistor meets IEEE detection accuracy and tempco requirements |
Applications
| Outdoor Security Cameras | Commercial Information Displays |
|---|---|
|
Use Scenario: IP-based PTZ cameras deployed outdoors require robust PoE power with auxiliary backup for extended uptime. IC Role / Device Role / Timing Role: LT4275BIMS#TRPBF acts as IEEE 802.3at-compliant PD interface, managing inrush, classification, and PSE type detection. Use Value: Enables 25.5W delivery for pan/tilt/zoom motors and image sensors while supporting AUX-driven failover to local DC supply. |
Use Scenario: Large-format LCD/LED kiosks in retail environments use PoE for simplified cabling and centralized power management. IC Role / Device Role / Timing Role: LT4275BIMS#TRPBF serves as primary PD controller, coordinating with isolated DC/DC converter startup via PWRGD. Use Value: Delivers full 25.5W within IEEE limits to drive backlight and logic, with thermal protection ensuring reliability in enclosed enclosures. |
| Industrial Ethernet Gateways | High-Temperature Networked Sensors |
|
Use Scenario: DIN-rail mounted gateways in factory automation require stable PoE operation across wide ambient temperatures. IC Role / Device Role / Timing Role: LT4275BIMS#TRPBF provides IEEE-compliant PD interface with –40°C to 85°C junction rating and undervoltage lockout. Use Value: Ensures reliable detection and classification even during cold start or voltage sag, preventing false disconnects in noisy industrial settings. |
Use Scenario: Wireless sensor nodes in HVAC ducts or near machinery operate in elevated ambient temperatures with limited airflow. IC Role / Device Role / Timing Role: LT4275BIMS#TRPBF functions as ruggedized PD controller with overtemperature shutdown and 100V abs max rating. Use Value: Sustains operation up to 85°C ambient without derating, while thermal protection prevents latch-up during transient overloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4265 | Integrated 100V/1A switch; no external MOSFET required; supports same 25.5W IEEE 802.3at classification | Reduces external component count but increases power dissipation in IC; less flexible thermal design | Select LTC4265 when board space is constrained and system power is ≤25W with moderate thermal budget |
| LT4275CIMS#TRPBF | IEEE 802.3af-compliant (13W); identical MSOP-10 package and pinout; RCLASS configured for Class 3 (49.9Ω) | Limited to lower-power VoIP phones or basic sensors; not suitable for 25.5W loads | Choose LT4275CIMS#TRPBF only for cost-sensitive, low-power applications where 13W suffices and future upgrade path is unnecessary |
Compared with LTC4265 and LT4275CIMS#TRPBF, the LT4275BIMS#TRPBF offers optimal balance of external MOSFET flexibility, thermal manageability, and strict IEEE 802.3at compliance-making it preferred for mid-to-high-power PoE PDs requiring field-replaceable FETs and auxiliary supply support.
Availability
LT4275BIMS#TRPBF is available at Aetrix Electronics and suitable for outdoor security camera deployments, commercial digital signage installations, and industrial Ethernet gateway designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT4275BIMS#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 acquired Linear Technology in 2017 and maintains its high-reliability analog/power IC portfolio. Linear Technology was founded to deliver precision, high-performance analog components for demanding industrial and communications applications.
The LT4275BIMS#TRPBF belongs to Linear's PoE PD controller product line, engineered specifically for IEEE 802.3at-compliant Powered Devices requiring robust classification, efficient N-channel MOSFET control, and auxiliary supply integration in compact form factors.
FAQ
What is the maximum power delivered by the LT4275BIMS#TRPBF?
The LT4275BIMS#TRPBF delivers up to 25.5W of power at the RJ45 connector, fully compliant with IEEE 802.3at Type 2 specifications. This rating assumes proper external N-channel MOSFET selection, adequate heatsinking, and operation within the specified –40°C to 85°C junction temperature range. The LT4275BIMS#TRPBF does not support LTPoE++ or higher power levels beyond 25.5W.
Does the LT4275BIMS#TRPBF require an external MOSFET?
Yes, the LT4275BIMS#TRPBF requires an external N-channel MOSFET connected between VPORT (drain), HSSRC (source), and HSGATE (gate). Its internal charge pump drives the gate to enable low-RDS(ON) FETs, improving efficiency and thermal performance over P-channel solutions. The LT4275BIMS#TRPBF itself contains no power switch.
How does the T2P pin function on the LT4275BIMS#TRPBF?
On the LT4275BIMS#TRPBF, the T2P pin is an open-drain output that pulls low after successful IEEE 802.3at two-event classification to indicate 25.5W PSE availability. It remains floating for Type 1 (13W) PSEs. This signal is used by downstream circuitry-such as microcontrollers-to configure power management policies. The LT4275BIMS#TRPBF does not assert T2P for LTPoE++ modes.
Can the LT4275BIMS#TRPBF operate with auxiliary power input?
Yes, the LT4275BIMS#TRPBF supports auxiliary power override via the AUX pin. When AUX exceeds 6.3V, the device disables classification, disconnects the signature resistor, pulls down HSGATE, and floats PWRGD-enabling seamless handoff to an external 9–60V DC or 24V AC supply. This feature is confirmed in the datasheet's Applications Information section and applies directly to the LT4275BIMS#TRPBF.
What package type and thermal characteristics does the LT4275BIMS#TRPBF have?
The LT4275BIMS#TRPBF uses a 10-lead plastic MSOP package (3mm × 3mm) with θJC = 45°C/W. Unlike the DFN variant, it lacks an exposed pad; thermal transfer relies on lead-frame conduction. Its specified operating junction temperature range is –40°C to 85°C, and it includes overtemperature protection that pulls down HSGATE and PWRGD if TJ exceeds 150°C.
LT4275BIMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD)
- Number of Channels:
- 1
- Power - Max:
- 25.5 W
- Internal Switch(s):
- No
- Auxiliary Sense:
- Yes
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 23V ~ 60V
- Current - Supply:
- 2mA (Max)
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT4275BIMS#TRPBF FAQ
1.How can I place an order for LT4275BIMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4275BIMS#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 LT4275BIMS#TRPBF reliable?
The price and inventory of LT4275BIMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4275BIMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4275BIMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4275BIMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4275BIMS#TRPBF?
LT4275BIMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4275BIMS#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 LT4275BIMS#TRPBF?
For technical support, including LT4275BIMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4275BIMS#TRPBF requirements.
6.How does Aetrix verify that LT4275BIMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4275BIMS#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 LT4275BIMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4275BIMS#TRPBF?
All LT4275BIMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4275BIMS#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 LT4275BIMS#TRPBF part is unused and in its original packaging.
Return procedure for LT4275BIMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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