MAX5933BESA+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High-Efficiency, Low-Power, Programmable Current Limit
• Package: 8-pin SOIC (Small Outline Integrated Circuit)
• Essence: Power Over Ethernet (PoE) Controller
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 36V to 57V
• Output Voltage Range: 2.5V to 14V
• Maximum Output Current: 600mA
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 100µA (typical)

Pin Configuration

The MAX5933BESA+T has the following pin configuration:

1. VDD: Power Supply Input
2. GND: Ground
3. EN: Enable Pin
4. ILIM: Current Limit Programming Pin
5. VOUT: Output Voltage
6. FB: Feedback Pin
7. NC: No Connection
8. VIN: Input Voltage

Functional Features

• Supports IEEE 802.3af/at-compliant Powered Devices (PDs)
• Programmable current limit for PDs
• Integrated detection and classification of PDs
• Automatic detection of short-circuit and over-temperature conditions
• Built-in thermal shutdown protection
• Low quiescent current for energy efficiency

Advantages and Disadvantages

Advantages: - High-efficiency power management solution - Programmable current limit allows customization for different devices - Integrated detection and classification simplify PoE implementation - Automatic protection features enhance system reliability - Low quiescent current reduces power consumption

Disadvantages: - Limited maximum output current (600mA) - Restricted input voltage range (36V to 57V)

Working Principles

The MAX5933BESA+T is a PoE controller IC designed to provide power to Ethernet-connected devices. It operates by receiving power from an Ethernet switch or injector through the network cable and converting it into a regulated DC voltage suitable for powering the connected device.

The IC incorporates a programmable current limit feature, allowing customization of the maximum current delivered to the powered device. This ensures compatibility with various types of devices that may have different power requirements.

The MAX5933BESA+T also includes integrated detection and classification circuitry, which automatically identifies the connected device's power needs according to the IEEE 802.3af/at standards. This simplifies the implementation of PoE systems by eliminating the need for external detection and classification components.

Furthermore, the IC features built-in protection mechanisms such as short-circuit detection, over-temperature detection, and thermal shutdown. These safeguards enhance system reliability and prevent damage to the IC and the connected device.

Detailed Application Field Plans

The MAX5933BESA+T is commonly used in various applications where Power Over Ethernet is required. Some typical application fields include:

1. IP Cameras: The IC can power IP cameras, eliminating the need for separate power cables and simplifying installation.
2. Wireless Access Points: It can provide power to wireless access points, enabling flexible placement without the constraint of nearby power outlets.
3. VoIP Phones: The IC is suitable for powering Voice over IP (VoIP) phones, reducing clutter and facilitating easy deployment.
4. Network Switches: It can be used in network switches to provide power to connected devices, streamlining cable management.

Detailed and Complete Alternative Models

1. MAX5940: PoE PD Controller with Integrated DC-DC Converter

   • Category: Integrated Circuit (IC)
   • Use: Power Management
   • Characteristics: Integrated DC-DC Converter, Programmable Current Limit
   • Package: 20-pin TQFN (Thin Quad Flat No-Lead)
   • Essence: PoE PD Controller with Integrated DC-DC Converter

2. TPS23754: IEEE 802.3at PoE PD Interface and PWM Controller

   • Category: Integrated Circuit (IC)
   • Use: Power Management
   • Characteristics: IEEE 802.3at Compliance, Integrated PWM Controller
   • Package: 20-pin HTSSOP (Heat Sink Thin Shrink Small Outline Package)
   • Essence: IEEE 802.3at PoE PD Interface and PWM Controller

3. LT4276: LTPoE++ PD Controller with Synchronous Forward and Flyback Controllers

   • Category: Integrated Circuit (IC)
   • Use: Power Management
   • Characteristics: LTPoE++ Compliance, Synchronous Forward and Flyback Controllers
   • Package: 38-pin QFN (Quad Flat No-Lead)
   • Essence: LTPoE++ PD Controller