Overview
The LT4294IDD#TRPBF, produced by Analog Devices Inc., is an IEEE 802.3af/at/bt-compliant powered device (PD) interface controller. This component is designed to manage power delivery in Power over Ethernet (PoE) systems, ensuring efficient and reliable power supply to connected devices. The LT4294 supports up to 71.3W of power delivery, making it suitable for a wide range of applications that require high power levels. It also maintains backwards compatibility with existing Power Sourcing Equipment (PSE) systems, facilitating seamless integration into various network infrastructures.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| VPORT Aux Mode Range | 8 | 60 | V | |
| Signature/Class Hysteresis Window | 1.0 | V | ||
| VRESET Reset Threshold | 2.6 | 5.6 | V | |
| VHSON Hot Swap Turn-On Voltage | 35 | 37 | V | |
| VHSOFF Hot Swap Turn-Off Voltage | 30 | 31 | V | |
| Hot Swap On/Off Hysteresis Window | 3 | V | ||
| Junction Temperature Range | –40 | 125 | °C |
Key Features
- IEEE 802.3af/at/bt compliance, supporting up to 71.3W PDs.
- 5-event classification sensing for accurate power negotiation.
- Superior surge protection with an absolute maximum of 100V.
- Integrated signature resistor and onboard thermal protection.
- Adjustable start-up inrush current using an external capacitor.
- Auxiliary power override as low as 9V via the AUX pin.
- Pin-for-pin compatibility with the LT4275 family for easy migration.
- Support for LT4320/LT4321 ideal diode bridges to enhance power delivery efficiency.
Applications
- IEEE 802.3af/at/bt Powered Device (PD) Controller.
- High-power PoE applications requiring up to 71.3W.
- Network infrastructure devices such as switches, routers, and access points.
- IP phones, security cameras, and other PoE-enabled devices.
- Industrial control systems and IoT devices.
Q & A
- What is the maximum power delivery supported by the LT4294?
The LT4294 supports up to 71.3W of power delivery. - Is the LT4294 compatible with existing PSE systems?
Yes, the LT4294 maintains backwards compatibility with existing Power Sourcing Equipment (PSE) systems. - What is the junction temperature range of the LT4294?
The junction temperature range is –40°C to 125°C. - Does the LT4294 have built-in thermal protection?
Yes, the LT4294 includes onboard thermal protection. - How does the LT4294 handle surge protection?
The LT4294 offers superior surge protection with an absolute maximum of 100V. - Can the start-up inrush current be adjusted?
Yes, the start-up inrush current can be adjusted using an external capacitor. - What is the purpose of the AUX pin?
The AUX pin allows for auxiliary power override as low as 9V. - Is the LT4294 compatible with ideal diode bridges?
Yes, it supports LT4320/LT4321 ideal diode bridges to enhance power delivery efficiency. - What is the significance of the T2P output?
The T2P output indicates the number of classification events received during IEEE 802.3bt-compliant mutual identification and negotiation of available power. - Can the LT4294 be used in industrial control systems?
Yes, the LT4294 can be used in industrial control systems and IoT devices.
