LTC4269IDKD-1#TRPBF: Features and Applications Explained
Overview
The LTC4269IDKD-1#TRPBF is a dual-channel Power Device Controller (PD) compliant with the IEEE 802.3at (PoE+) standard, manufactured by Analog Devices (formerly Linear Technology). Designed for Power over Ethernet (PoE) devices, this device can receive up to 25.5W of power over a standard Ethernet cable while providing efficient synchronous rectified DC/DC control, enabling efficient energy conversion from Ethernet power to system loads.
The LTC4269-1 integrates a PD interface circuit, classification detection circuit, thermal protection, undervoltage lockout, DC/DC controller, and synchronous rectifier driver to form a complete PoE power receiving solution. Its superior energy efficiency, high integration, and reliability make it a core component in power supply systems for IP cameras, wireless access points, industrial Ethernet devices, VoIP phones, embedded gateways, and more.
Core parameters
Parameter | numerical values |
PoE Standard Compatibility | IEEE 802.3af / IEEE 802.3at (Type 2, PoE+) |
Maximum input voltage | 100V |
Typical operating input voltage | 37V ~ 57V |
Output power capability | Up to 25.5W (PoE+ compliant) |
DC/DC control architecture | Synchronous flyback/forward controller (with built-in MOSFET driver) |
Operating frequency | 250kHz (adjustable) |
Synchronous rectifier drive | Support (improve efficiency) |
Input surge protection | Built-in 100V protection |
Detection and classification functions | Compliant with IEEE 802.3af/at requirements |
Operating current (PD mode) | < 2mA |
Packaging | 16-pin DFN (5mm × 4mm) |
Operating temperature range | -40°C to +125°C (industrial grade) |
Environmental standards | RoHS compliant / Lead-free |
Features
Compliant with IEEE 802.3at/af dual standards
Supports PoE+ high-power (25.5W) powered devices, while being backward compatible with standard PoE (13W).
High-efficiency DC/DC control
Integrated synchronous rectification driver enables conversion efficiency of >90%.
Complete power receiving end integrated functions
It integrates functions such as detection, classification, startup, DC/DC control, thermal protection, and undervoltage lockout, greatly simplifying system design.
Multiple topology support
It supports flyback, forward, and push-pull topologies to adapt to different load requirements.
High reliability design
Built-in surge current limiting and thermal shutdown protection ensure long-term stable operation.
Low power standby mode
The PD consumes very little current when idle, improving the system’s energy-saving performance.
Typical application scenarios
IP network camera (PoE powered)
Stable power supply and high-efficiency power conversion enhance the reliability of video equipment.
Wireless access point (WAP / AP)
High power output meets the requirements of dual-band routing or MIMO wireless modules.
VoIP network telephony/gateway device
Provides a stable 5V/12V system power supply to ensure reliable voice communication.
Industrial Ethernet Node
Used in industrial automation equipment such as PLCs and data acquisition terminals.
Intelligent Building and Security Systems
Control terminal, PoE sensor, access control device.
Performance Comparison
Index | LTC4269IDKD-1#TRPBF | TPS23753A (TI) |
PoE Standard Compatibility | IEEE 802.3af / at | IEEE 802.3af / at |
Output power | 25.5W | 25.5W |
Topology support | Flyback / Forward / Push-Pull | Flyback / Forward |
Synchronous rectifier drive | support | Not supported |
Maximum efficiency | >90% | ~85% |
Package size | 16-pin DFN (Compact) | HTSSOP-16 |
Operating temperature | -40°C ~ +125°C | -40°C ~ +85°C |
Compared to the TI TPS23753A, the LTC4269-1 offers higher efficiency, a wider temperature range, and more flexible topology compatibility, making it ideal for industrial and high-end network equipment.
Manufacturer Profile: Analog Devices (ADI / Linear Technology)
Analog Devices is a leading global manufacturer of high-performance analog and power chips. The LTC4269 series continues Linear Technology’s tradition of highly reliable power supply design, featuring excellent energy efficiency, wide operating temperature range, and automotive-grade quality control.
ADI’s PoE product line is widely used in enterprise networks, industrial IoT, building automation, and security systems, and enjoys an industry reputation for performance and reliability.
Why choose LTC4269IDKD-1#TRPBF?
● Complete IEEE 802.3at power receiver control solution
● High-efficiency DC/DC conversion (>90%) with built-in synchronous rectification driver
● Highly reliable protection mechanisms (thermal shutdown, surge, voltage clamping)
● Flexible topology support for various power architectures
● Industrial-grade temperature range (–40°C ~ +125°C)
● Compact DFN package for easy layout and heat dissipation
● ADI quality and long-term supply guarantee
Frequently Asked Questions (FAQ)
Q1: Does it support redundant external power input?
Yes. The LTC4269-1 features an automatic switching mechanism between PoE (Power over Ethernet) and external adapters, enabling redundant power input. When an external power source is connected, the device automatically switches the power supply path to ensure stable and reliable system operation.
Q2: Can it be used with non-isolated power supplies?
Yes. The LTC4269-1 supports non-isolated flyback topologies, but in most applications, an isolated design is still recommended to enhance system safety and electrical isolation performance, especially for industrial or network equipment.
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