Overview
The LT4295IUFD#PBF, produced by Analog Devices Inc., is a highly versatile and compliant powered device (PD) interface controller. It supports IEEE 802.3af, 802.3at, and 802.3bt standards, making it suitable for a wide range of Power over Ethernet (PoE) applications. This controller integrates a switching regulator controller capable of operating in either flyback or forward isolated power supply topologies. The LT4295 is designed to facilitate easy migration of LTPoE++ PDs to IEEE 802.3bt PDs and is pin-compatible with the LT4276A/B/C series.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Supply Voltage | 60 | V |
| Maximum Power | 71.3 | W |
| Package Type | 28-Lead QFN-EP | |
| Operating Junction Temperature | -40°C to 125°C | °C |
| Switching Frequency | 300 kHz (typical) | kHz |
| VCC Regulation Voltage | 7.6 V (typical at TJ = 25°C, VVPORT = VHSSRC = VVIN = 40V) | V |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | |
| Lead Free / RoHS Status | Lead free / RoHS Compliant |
Key Features
- Supports IEEE 802.3af, 802.3at, and 802.3bt standards.
- Operates in both flyback and forward power supply topologies with No-Opto feedback in flyback mode.
- Auxiliary power support as low as 9V.
- Utilizes an external, low RDS(on) N-channel hot swap MOSFET and supports LT4320/LT4321 ideal diode bridges for enhanced power delivery efficiency.
- Superior surge protection with an absolute maximum voltage of 100V.
- Ease of migration from LTPoE++ PDs to IEEE 802.3bt PDs.
- Pin-compatible with LT4276A/B/C.
- Duty cycle ramp soft-start to prevent overshoot during startup.
- On-chip detection signature resistor, thermal protection, slope compensation, and various user-configurable settings.
Applications
- High power wireless data systems.
- Outdoor security camera equipment.
- Commercial and public information displays.
- High temperature applications.
Q & A
- What are the supported PoE standards for the LT4295?
The LT4295 supports IEEE 802.3af, 802.3at, and 802.3bt standards.
- What are the power supply topologies supported by the LT4295?
The LT4295 supports both flyback and forward isolated power supply topologies.
- What is the maximum power handling capability of the LT4295?
The LT4295 can handle up to 71.3W of power.
- What is the operating junction temperature range of the LT4295?
The operating junction temperature range is -40°C to 125°C.
- Does the LT4295 support auxiliary power input?
- What type of package does the LT4295 come in?
The LT4295 comes in a 28-Lead QFN-EP package.
- Is the LT4295 lead-free and RoHS compliant?
- What is the typical switching frequency of the LT4295?
The typical switching frequency is 300 kHz.
- Does the LT4295 have built-in thermal protection?
- Can the LT4295 be used in high temperature applications?
