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Product introduction

The LTC4291IUF-1 is a 4-port Power supply device (PSE) controller designed for Power over Ethernet (PoE) systems, suitable for IEEE 802.3bt Type 3 and Type 4 standard scenarios requiring high power supply ‌. The LTC4291IUF-1 is designed to power PD to 802.3af, 802.3at and 802.3bt standards. By utilizing a low RDS(ON) external MOSFETs and a 0.15Ω detection resistor per power channel, the LTC4291IUF-1 achieves the lowest heat dissipation in the industry. The transformer-isolated communication protocol replaces expensive photocouplers and complex isolated 3.3V power supplies, resulting in significant savings in BOM costs.

Advanced power management features include 14-bit current monitoring per port, programmable current limiting, and universal fast shutdown for pre-selected ports. Simply apply for a free license to get advanced power management hosting software. PD detection uses a proprietary multipoint detection mechanism, which provides excellent immunity to PD misidentification. Supports autoclass and 5 event physical classification. The LTC4291IUF-1 includes an I2C serial interface that can operate at frequencies up to 1MHz. The LTC4291IUF-1 can be programmed via pin or I2C to negotiate up to 71.3 W of PD receive power.

The LTC4291IUF-1 has the following key features and performance:

1, ‌ port number and standard support ‌ : LTC4291IUF-1 has four PSE ports, each port has two power channels, fully meet the PSE requirements of IEEE 802.3bt Class 3 and 4 standards, support class 1, class 2, class 3 and class 4 PD (Powered Device) compliance ‌.

2. ‌ low power design ‌ : each power channel has low power path loss, the detection resistance is 150mΩ, the RDS(ON) of MOSFET is 30mΩ, which significantly reduces the heat dissipation and improves the efficiency ‌.

3, ‌ electrical isolation ‌ : LTC4291IUF-1 chipset provides electrical isolation, eliminating the need for expensive photocouplers and isolated 3.3V power supplies, thereby reducing Bill of Materials (BOM) costs ‌.

4. ‌ Advanced power management features ‌ : LTC4291IUF-1 includes 14-bit current monitoring per port, programmable current limiting, and universal quick shutdown for preselected ports. In addition, it also supports automatic classification and 5 event physical classification, with excellent immunity ‌.

5, ‌ communication protocol ‌ : LTC4291IUF-1 adopts I2C serial interface, can operate at frequencies up to 1MHz. The LTC4291IUF-1 can be programmed via pin or I2C to negotiate up to 71.3W of PD receive power ‌.

6, ‌ package form ‌ : LTC4291IUF-1 adopts 24-pin 4mm × 4mm QFN package, suitable for compact design ‌.

Typical application scenario

1. ‌ network switch and router ‌ : LTC4291IUF-1 supports up to 71.3W power supply capacity for PD devices conforming to 802.3af/at/bt standards, meeting the power demand of high-density network devices ‌.

2, ‌ industrial automation equipment ‌ : LTC4291IUF-1 through the low 30mΩ MOSFET RDS(ON) design to reduce heat loss, improve system reliability ‌.

3, ‌ intelligent building system ‌ : LTC4291IUF-1 support double signature PD detection, can distinguish single signature and double signature devices, enhance power supply flexibility ‌.

For the price of LTC4291IUF-1, please visit our official website (www.hkmjd.com).