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Analog Devices Inc. LTC4269CDKD-2#TRPBF
- Part No.:
- LTC4269CDKD-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 32-WFDFN Exposed Pad
- Datasheet:
-
LTC4269CDKD-2#TRPBF.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 32DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,622
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Product details
Overview
LTC4269CDKD-2#TRPBF from Analog Devices (formerly Linear Technology) is an IEEE 802.3at Type-2 Powered Device (PD) interface and synchronous forward controller IC with integrated 100V Hot Swap MOSFET, 2-event classification, auxiliary power support, and programmable 100–500kHz switching frequency. It delivers up to 25.5W PoE+ power for high-power IP phones, PTZ cameras, and dual-radio access points.
For engineers reviewing the LTC4269CDKD-2#TRPBF datasheet, LTC4269CDKD-2#TRPBF pinout, LTC4269CDKD-2#TRPBF application, or LTC4269CDKD-2#TRPBF equivalent, key selection considerations include its 32-pin DFN package, dual PWRGD outputs (active-high referenced to VNEG and active-low referenced to VPORTN), 2.5V internal reference, 1.226V FB threshold, and compliance with IEEE 802.3at Layer 1 2-event classification.
Technical Context
The LTC4269CDKD-2#TRPBF integrates a PD front-end state machine with signature resistance (26kΩ typ), programmable class current via RCLASS, and T2P open-drain indicator for Type-2 PSE detection. Its synchronous forward controller uses current-mode PWM with adaptive maximum duty cycle clamp, slope-compensated ISENSE input, and OC pin with 107mV overcurrent threshold independent of duty cycle.
It supports isolated power supply design with SOUT/OUT dual gate drivers, adjustable blanking (180–540ns) and delay timing (40–120ns), soft-start via SS_MAXDC, and UVLO/OVLO protection on both VPORTP (30–71V) and VIN (8.75–15.75V). The controller achieves >94% efficiency in PoE-based self-driven forward topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | IEEE 802.3at Type-2 PD (25.5W max); supports 2-event classification and T2P signaling |
| Integrated FET | 100V, 0.7Ω (typ) Hot Swap MOSFET with 100mA inrush limit and 1µA leakage at 57V |
| Switching Frequency | Programmable 100–500kHz via ROSC resistor; typical 200kHz at ROSC = 178kΩ |
| FB Reference Voltage | 1.226V (min) to 1.250V (max); sets output voltage accuracy in non-isolated supplies |
| VREF Output | 2.5V ±2.5% (2.425–2.575V); supplies internal circuitry and can source 2.5mA externally |
| OC Threshold | 107mV (typ); precision overcurrent detection independent of duty cycle for robust fault protection |
| Package | 32-lead (7mm × 4mm) DFN with exposed thermal pad soldered to GND plane |
Pinout & Package
Package: 32-lead plastic DFN (7mm × 4mm), thermally enhanced with exposed pad (Pin 33) requiring solder connection to GND plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (1) | Shutdown control input | Drives high to disable operation and corrupt signature resistance; tie to VPORTN if unused |
| T2P (2) | Type-2 PSE indicator | Open-drain output low when 2-event classification confirms Type-2 PSE presence |
| RCLASS (3) | Classification current setting | Resistor to VPORTN sets ICLASS per IEEE 802.3at Class 0–4 (e.g., 30.9Ω = Class 3) |
| VPORTN (5,6) | Negative input rail | Connects to diode bridge output; pins 5 & 6 must be shorted externally at PCB |
| COMP (9) | Error amplifier output | 0.8–2.5V range corresponds to 0–220mV at ISENSE; used for loop compensation and current sensing |
| FB (10) | Feedback input | Compares output voltage divider against 1.226V internal reference; connect to VREF to disable amplifier |
| ROSC (11) | Oscillator programming | Resistor to GND sets fSW from 100–500kHz; nominal pin voltage = 1.0V |
| SS_MAXDC (13) | Soft-start & duty clamp | Capacitor + resistor divider sets soft-start time; voltage level determines max duty cycle clamp (e.g., 1.84V = 72%) |
| VREF (14) | Internal reference output | 2.5V ±2.5% reference; bypass with 0.1µF ceramic capacitor to GND |
| SD_VSEC (15) | UVLO & volt-second clamp | 1.32V threshold enables UVLO hysteresis and OUT duty cycle clamping based on input voltage |
| GND (16) | Analog ground | Reference for FB, COMP, ROSC, SYNC; tie to VNEG at single point |
| BLANK (17) | Current sense blanking | Resistor to GND adjusts blanking duration (180–540ns) to avoid false OC trips during FET turn-on |
| ISENSE (18) | Main current sense input | Connects to source of external MOSFET; slope compensation resistor adds duty-cycle-dependent ramp |
| OC (19) | Dedicated overcurrent input | 107mV threshold for fast, duty-cycle-independent overcurrent detection; connects directly to sense resistor |
| DELAY (20) | SOUT-to-OUT timing adjust | Resistor to GND sets delay (40–120ns) between SOUT and OUT rising edges for optimal forward converter timing |
| PGND (21) | Power ground return | Carries gate driver return current; tie to VNEG at power ground star point |
| OUT (22) | Main gate driver output | Drives N-channel MOSFET gate from 0V to VIN (clamped at 13V max); active pull-off in shutdown |
| VIN (23) | Controller supply input | 14.25V ON / 8.75V OFF UVLO; requires local 0.1µF + 10µF decoupling |
| SOUT (24) | Synchronous rectifier sync | In-phase with OUT; drives secondary-side FETs or active clamp FET; clamped at 12V, active pull-off in shutdown |
| VNEG (26,27) | Negative power output | Return path from internal Hot Swap FET to power supply; pins 26 & 27 must be shorted externally |
| PWRGD (28) | Active-high power good | Open-collector output referenced to VNEG; low impedance during inrush/thermal fault; clamped at 14V above VNEG |
| PWRGD (29) | Active-low power good | Open-drain output referenced to VPORTN; high impedance during inrush/thermal fault; no internal clamp |
| VPORTP (32) | Positive input rail | Accepts PoE input (up to 100V abs max); connects to diode bridge positive output |
| Exposed Pad (33) | Thermal & electrical ground | Mandatory solder connection to PCB GND plane for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| 2-event classification support | Enables IEEE 802.3at Type-2 PD identification and T2P signaling without Layer 2 negotiation |
| Synchronous forward controller | Delivers >94% efficiency in isolated PoE supplies using SOUT/OUT dual-drive architecture |
| Flexible auxiliary power interface | SHDN pin allows auxiliary power sequencing; SD_VSEC enables programmable UVLO and volt-second clamp |
| Robust Hot Swap FET | Integrated 100V/0.7Ω MOSFET with thermal protection, 100mA inrush limiting, and 1µA leakage at 57V |
| EMI-optimized timing control | Programmable 100–500kHz switching, adjustable blanking (180–540ns), and SOUT/OUT delay (40–120ns) |
| Complete protection suite | Includes UVLO/OVLO on VPORTP and VIN, short-circuit protection with auto-restart, and thermal shutdown |
Applications
| IP Phones with Large Color Screens | Dual Radio 802.11n Access Points |
|---|---|
Use Scenario: High-resolution display, VoIP processing, and Bluetooth/Wi-Fi coexistence demand stable 5V/3A+ power from PoE. IC Role / Device Role / Timing Role: LTC4269CDKD-2#TRPBF serves as full PD interface + forward controller, managing classification, inrush, and isolated 5V generation. Use Value: Integrated 2-event classification ensures compatibility with 802.3at PSEs; >94% efficiency minimizes heat in compact enclosures. | Use Scenario: Dual-band 2.4GHz/5GHz radios require clean, regulated 5V/4A power with minimal thermal rise in wall-mount housing. IC Role / Device Role / Timing Role: LTC4269CDKD-2#TRPBF provides IEEE-compliant PD front-end and synchronous forward regulation with SOUT-driven secondary-side rectification. Use Value: Programmable 100–500kHz switching allows EMI optimization; dual PWRGD outputs enable system-level power sequencing and fault reporting. |
| PTZ Security Cameras | Industrial PoE Media Converters |
Use Scenario: Pan-tilt-zoom motors, IR illumination, and HD video streaming draw bursty 12V/2A loads over extended cable runs. IC Role / Device Role / Timing Role: LTC4269CDKD-2#TRPBF acts as PoE interface and forward controller, delivering regulated 12V with adaptive duty cycle clamp and volt-second limiting. Use Value: SD_VSEC pin enables precise UVLO hysteresis and OUT duty cycle clamping to maintain regulation under long-cable voltage drop. | Use Scenario: Fiber-to-Ethernet conversion in industrial settings requires reliable 24V/1A PoE-powered operation across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: LTC4269CDKD-2#TRPBF functions as ruggedized PD interface and forward controller, leveraging its 100V FET and wide-temp qualified design. Use Value: Exposed thermal pad and 125°C junction rating ensure thermal stability; integrated signature resistor eliminates external component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device interface and forward controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4275AIMSE#PBF | IEEE 802.3bt (Type 3/4) compliant; supports up to 71.3W; no integrated forward controller; requires external DC/DC | Targeted at higher-power applications (>25.5W); lacks synchronous forward control, so needs separate power stage | Select when upgrading to 802.3bt infrastructure or when modular PD + DC/DC design is preferred |
| MAX5984AEUI+T | IEEE 802.3at-compliant PD interface only; no integrated PWM controller; 100V FET with 0.85Ω RDS(on); supports 2-event classification | Requires external DC/DC controller for power conversion; simpler BOM for designs already using discrete forward controllers | Select when separating PD interface and power conversion for flexibility or cost optimization |
Compared with LT4275AIMSE#PBF and MAX5984AEUI+T, the LTC4269CDKD-2#TRPBF uniquely integrates both IEEE 802.3at PD interface and synchronous forward controller in one 32-pin DFN, eliminating external controller ICs and reducing solution size by ~35% while maintaining full 25.5W capability.
Availability
LTC4269CDKD-2#TRPBF is available at Aetrix Electronics and suitable for IP phones, PTZ security cameras, dual-radio 802.11n access points, industrial media converters, and other PoE-powered embedded systems requiring stable component supply and full IEEE 802.3at Type-2 compliance.
Supply support for LTC4269CDKD-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to strengthen its power management portfolio.
The LTC4269-2 product line was designed specifically for IEEE 802.3at-compliant Powered Devices requiring integrated PD interface and high-efficiency synchronous forward power conversion in space-constrained applications.
FAQ
What is the maximum power delivery capability of the LTC4269CDKD-2#TRPBF?
The LTC4269CDKD-2#TRPBF is fully compliant with IEEE 802.3at Type-2 Powered Device specifications and supports up to 25.5W of delivered power. This is achieved through its integrated 100V Hot Swap MOSFET, 2-event classification circuitry, and synchronous forward controller capable of >94% efficiency in optimized designs. Power delivery is limited by PSE capability and system thermal design-not by the IC itself.
How does the LTC4269CDKD-2#TRPBF handle IEEE 802.3at 2-event classification?
The LTC4269CDKD-2#TRPBF implements full Layer 1 2-event classification per IEEE 802.3at. It presents a valid 25kΩ signature before the first classification event, then switches to an invalid signature after detection to trigger the second event. The T2P pin (Pin 2) asserts low upon successful completion, signaling Type-2 PSE presence to the host system-enabling dynamic power mode selection in the LTC4269CDKD-2#TRPBF application.
Can the LTC4269CDKD-2#TRPBF be used in isolated forward converter topologies?
Yes, the LTC4269CDKD-2#TRPBF is explicitly designed for isolated forward converters. Its SOUT pin provides a synchronized gate drive signal for secondary-side synchronous rectifiers, while the OUT pin drives the primary-side MOSFET. The IC includes dedicated features for isolation-such as SD_VSEC-based volt-second clamping, adjustable BLANK timing to suppress transformer reset spikes, and FB-referenced error amplification compatible with optocoupler feedback loops.
What is the purpose of the dual PWRGD outputs on the LTC4269CDKD-2#TRPBF?
The LTC4269CDKD-2#TRPBF provides two independent PWRGD outputs: Pin 28 (active-high, referenced to VNEG) and Pin 29 (active-low, referenced to VPORTN). This dual signaling enables flexible system-level power sequencing-e.g., Pin 28 can drive a microcontroller's enable input (VNEG-referenced logic), while Pin 29 can feed a PSE fault-reporting line (RJ45-referenced). Both assert during inrush or thermal overload, providing redundant status monitoring in the LTC4269CDKD-2#TRPBF application.
Does the LTC4269CDKD-2#TRPBF require external components for IEEE 802.3at compliance?
The LTC4269CDKD-2#TRPBF integrates critical IEEE 802.3at functions-including signature resistance (26kΩ typ), classification current load, 2-event state machine, and T2P indicator-eliminating most external components. Only RCLASS (to set Class 0–4), ROSC (to set switching frequency), and passive RC networks for SD_VSEC, BLANK, and DELAY are required. No external signature resistors, class current sources, or timing capacitors are needed, simplifying BOM and layout for the LTC4269CDKD-2#TRPBF design.
LTC4269CDKD-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD), DC/DC
- Number of Channels:
- 1
- Power - Max:
- 25.5 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- Yes
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 37.2V ~ 60V
- Current - Supply:
- 1.35mA (Max)
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-DFN (7x4)
LTC4269CDKD-2#TRPBF FAQ
1.How can I place an order for LTC4269CDKD-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4269CDKD-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 LTC4269CDKD-2#TRPBF reliable?
The price and inventory of LTC4269CDKD-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 LTC4269CDKD-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4269CDKD-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4269CDKD-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4269CDKD-2#TRPBF?
LTC4269CDKD-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4269CDKD-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 LTC4269CDKD-2#TRPBF?
For technical support, including LTC4269CDKD-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4269CDKD-2#TRPBF requirements.
6.How does Aetrix verify that LTC4269CDKD-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4269CDKD-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 LTC4269CDKD-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4269CDKD-2#TRPBF?
All LTC4269CDKD-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4269CDKD-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 LTC4269CDKD-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4269CDKD-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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