MAX5981BETE+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power over Ethernet (PoE) Controller
• Characteristics: High efficiency, compact size, advanced power management features
• Package: 16-pin TQFN (Thin Quad Flat No-Lead)
• Essence: Provides power and control for PoE applications
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 36V to 57V
• Output Voltage Range: 3.3V to 5.5V
• Maximum Output Current: 400mA
• Operating Temperature Range: -40°C to +85°C
• Efficiency: Up to 92%
• Power Dissipation: 1.2W (typical)

Pin Configuration

The MAX5981BETE+T has a total of 16 pins arranged as follows:

1. VDD: Power supply input
2. GND: Ground reference
3. VDDP: Power supply input for internal circuitry
4. VDDC: Power supply input for controller circuitry
5. VDDA: Power supply input for analog circuitry
6. VOUT: Output voltage
7. FB: Feedback pin for output voltage regulation
8. EN: Enable pin for device operation
9. ILIM: Current limit setting pin
10. PGND: Power ground reference
11. PGOOD: Power good indicator output
12. INTVCC: Internal voltage reference output
13. NC: No connection
14. NC: No connection
15. NC: No connection
16. NC: No connection

Functional Features

• Integrated IEEE 802.3af/at compliant PoE controller
• Supports both end-span and mid-span applications
• Advanced power management features for efficient power delivery
• Overcurrent and overtemperature protection
• Integrated current limit and thermal shutdown circuitry

Advantages and Disadvantages

Advantages: - High efficiency resulting in reduced power dissipation - Compact size allows for space-saving designs - Supports both end-span and mid-span PoE applications - Advanced power management features enhance system performance

Disadvantages: - Limited output current of 400mA may not be suitable for high-power devices - Operating temperature range may restrict usage in extreme environments

Working Principles

The MAX5981BETE+T is a PoE controller that enables the transmission of power and data over Ethernet cables. It integrates all the necessary functions required for IEEE 802.3af/at compliant PoE applications. The device operates by receiving power from an external power source and converting it to the desired output voltage. It regulates the output voltage using feedback control, ensuring stable and reliable power delivery to the connected device.

Detailed Application Field Plans

The MAX5981BETE+T is commonly used in various PoE applications, including:

1. IP Cameras: Provides power and data connectivity to IP cameras, eliminating the need for separate power cables.
2. Wireless Access Points: Enables power delivery to wireless access points, simplifying installation and reducing cable clutter.
3. VoIP Phones: Powers VoIP phones through Ethernet cables, allowing for flexible placement without proximity to power outlets.
4. Network Switches: Facilitates power delivery to network switches, enabling remote installation in locations without power availability.
5. Industrial Automation: Supports PoE-enabled industrial automation devices, enhancing flexibility and ease of deployment.

Detailed and Complete Alternative Models

1. MAX5969AETE+: Similar PoE controller with higher output current capability (up to 600mA).
2. LTC4267CGN#PBF: PoE controller with advanced power management features and extended temperature range.
3. TPS23754PWPR: Integrated PoE controller with enhanced thermal performance and adjustable current limit.

(Note: The above alternative models are provided for reference and may have different specifications and pin configurations. It is recommended to refer to the respective datasheets for detailed information.)

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