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MAX5940AESA from MAXIM,MAXIM - Dallas Semiconductor

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MAX5940AESA

Manufacturer: MAXIM, MAX

IEEE 802.3af PD Interface Controller For Power-Over-Ethernet

Partnumber Manufacturer Quantity Availability
MAX5940AESA MAXIM, MAX 719 In Stock

Description and Introduction

IEEE 802.3af PD Interface Controller For Power-Over-Ethernet The MAX5940AESA is a power management IC (PMIC) manufactured by Maxim Integrated (now part of Analog Devices). Below are its specifications, descriptions, and features based on Ic-phoenix technical data files:

### **Specifications:**  
- **Manufacturer:** Maxim Integrated  
- **Part Number:** MAX5940AESA  
- **Package:** 8-pin SOIC (Small Outline Integrated Circuit)  
- **Operating Voltage Range:** 15V to 80V  
- **Output Voltage:** Adjustable  
- **Maximum Output Current:** 1.5A (with external FET)  
- **Power Dissipation:** 1.5W (typical)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Description:**  
The MAX5940AESA is a high-voltage, current-mode PWM controller designed for isolated power supply applications. It provides primary-side control for flyback, forward, and other isolated topologies. It includes features like programmable soft-start, cycle-by-cycle current limiting, and under-voltage lockout (UVLO).  

### **Features:**  
- **Wide Input Voltage Range (15V to 80V)** – Suitable for industrial and telecom applications.  
- **Current-Mode PWM Control** – Enhances transient response and simplifies loop compensation.  
- **Programmable Soft-Start** – Reduces inrush current during startup.  
- **Cycle-by-Cycle Current Limiting** – Protects against overloads.  
- **Under-Voltage Lockout (UVLO)** – Ensures proper operation under low input voltage conditions.  
- **External FET Drive** – Supports high-power applications with an external N-channel MOSFET.  
- **Adjustable Switching Frequency** – Allows optimization for efficiency and component size.  

This IC is commonly used in power-over-Ethernet (PoE) applications, industrial power supplies, and isolated DC-DC converters.  

Would you like additional details on any specific aspect?

Application Scenarios & Design Considerations

IEEE 802.3af PD Interface Controller For Power-Over-Ethernet

Alternative Part Number

  • TPS2375D --: IEEE 802.3af PoE PD controller in SOIC-8, functionally similar to the MAX5940AESA with integrated detection and classification.
  • LTC4267CDHC --: PoE PD interface controller with integrated switching regulator, comparable feature set and widely used as a MAX5940 alternative.
  • SI3402-B-GM --: Fully integrated PoE PD interface and DC-DC controller, drop-in style alternative for 802.3af powered device designs.
  • TPS23750PWPR --: Integrated PoE PD controller and DC-DC converter in a similar class; widely available and functionally comparable to the MAX5940A.
  • LT4275AIMS --: IEEE 802.3af/at PoE PD interface controller offering similar detection, classification and hot-swap functionality in a small package.

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