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LT4293HMS: LTPoE++®/IEEE 802.3bt Power Receiving Device (PD) controller

Introduction

The LT4293HMS is a power Receiving Device (PD) interface controller compliant with the LTPoE++/IEEE 802.3af/at/bt standard. T2P outputs distinguish between LTP ++ and IEEE 802.3bt power supply devices (PSE) during mutual identification and negotiation of available power.

The LT4293HMS features an external low-RDS (ON) N-channel hot-swapable MOSFETs that support the LT4320/LT4321 ideal bridge for increased end-to-end power transfer efficiency and the elimination of expensive heat fins. The LT4293HMS also includes power normal state output, onboard characteristic resistors, undervoltage lock, and thermal protection. The starting surge current can be regulated by an external capacitor. With AUX pins, the LT4293HMS supports auxiliary power coverage down to 9V.

With changes to external components, the LT4293HMS can be configured to support all possible LTP ++, 802.3bt, 802.3at, and 802.3af power levels. Pin-compatibility with LT4275 and LT4294 series PD interface controllers enables easy migration between LTPoE++ PD and IEEE 802.3bt compliant PD.

Key features of LT4293HMS include:

LTPoE++®/IEEE 802.3bt Power Receiving Device (PD) controller

Supports up to 90W PD

Distinguish between LTP ++ and IEEE 802.3bt PSE

5 Event classification perception

Excellent surge protection (100V absolute maximum)

Wide junction temperature range (-40 °C to 125°C)

Overtemperature protection

Integrated characteristic resistor

Lowest power consumption and highest system efficiency with external hot-swappable N-channel MOSFETs

Configurable auxiliary power supplies down to 9V are supported

Pin-compatible with LT4275A/B/C and LT4294

Available in 10-pin MSOP package

Application field

The LT4293HMS is widely used in the following areas:

1. ‌ Industrial automation and intelligent control system ‌

By supporting power outputs up to 90W ‌, the LT4293HMS is widely used in power supply systems for industrial automation equipment such as PLCS (Programmable logic controllers), sensor networks and real-time monitoring equipment. The external hot-swapable N-channel MOSFET design ‌ significantly reduces power loss and improves system stability for use in harsh industrial environments.

2. ‌ Intelligent Building and Security system ‌

In smart buildings, the LT4293HMS provides reliable power for IP cameras, access control systems and building automation controllers. It supports LTPoE++ and IEEE 802.3bt standards ‌ and can transmit data and power simultaneously over a single Ethernet cable, simplifying cabling complexity and reducing deployment costs.

3. ‌ network communication equipment ‌

The LT4293HMS is suitable for high-bandwidth network devices such as 5G base stations, routers and switches. It accurately identifies the type of power supply equipment (PSE) and dynamically adjusts the power distribution through the 5-event hierarchical detection function ‌ to ensure efficient energy use and stable operation of network equipment.

4. ‌ medical electronic equipment ‌

In portable medical devices such as monitors and diagnostic instruments, the LT4293HMS offers auxiliary power coverage down to 9V ‌ to support stable operation over a wide voltage range. Its thermal protection and undervoltage locking functions ‌ can prevent equipment failure caused by power fluctuations and ensure the safety of the medical system.

5. ‌ Internet of Things (IoT) terminal devices ‌

The LT4293HMS's high integration and low power consumption ‌ make it ideal for iot sensors, gateways, and edge computing nodes. It can work with the LT4320/LT4321 ideal bridge ‌ to improve end-to-end power transfer efficiency, reduce heat dissipation requirements, and extend equipment life.

Technical parameter

Product Number: LT4293HMS

Packaging: Roll Tape (TR)

Part Status: For sale

Type: Controller (PD)

Number of channels: 1

Power - Max. : 90 W

Internal switch: None

Auxiliary role: Yes

Standards: 802.3at (PoE+), 802.3af (PoE), 802.3bt, LTPoE++

Voltage - Power supply: 60V

Current - Power supply: 2mA

Operating temperature: -40°C ~ 125°C (TJ)

Mounting type: Surface mount type

Package/housing: 10-MSOP (0.118", 3.00mm wide)

If you need to purchase LT4293HMS products, you can visit our website www.hkmjd.com to contact Mingjiada Electronics.