TPS23757PW

Product Overview

Category

The TPS23757PW belongs to the category of integrated circuits (ICs) and specifically falls under the power management ICs.

Use

This IC is primarily used for power over Ethernet (PoE) applications. It provides a complete solution for implementing PoE in various devices such as IP phones, wireless access points, security cameras, and other network-connected devices.

Characteristics

• The TPS23757PW integrates all the necessary functions required for PoE, including detection, classification, and current limiting.
• It supports both IEEE 802.3af and IEEE 802.3at standards, making it compatible with a wide range of PoE devices.
• This IC offers high efficiency and low power dissipation, ensuring optimal power delivery to connected devices.
• It features built-in protection mechanisms such as thermal shutdown, overcurrent protection, and undervoltage lockout, enhancing system reliability.

Package and Quantity

The TPS23757PW is available in a small outline package (SOP) with 20 pins. It is typically sold in reels or tubes, with a standard quantity of 250 units per reel/tube.

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
• Power Dissipation: 1.5W

Pin Configuration

The TPS23757PW has a total of 20 pins, each serving a specific function. The detailed pin configuration is as follows:

1. VDD: Power supply input pin.
2. GND: Ground reference pin.
3. NC: No connection pin.
4. NC: No connection pin.
5. NC: No connection pin.
6. NC: No connection pin.
7. NC: No connection pin.
8. NC: No connection pin.
9. NC: No connection pin.
10. NC: No connection pin.
11. NC: No connection pin.
12. NC: No connection pin.
13. NC: No connection pin.
14. NC: No connection pin.
15. NC: No connection pin.
16. NC: No connection pin.
17. NC: No connection pin.
18. NC: No connection pin.
19. NC: No connection pin.
20. NC: No connection pin.

Functional Features

The TPS23757PW offers several functional features that make it an ideal choice for PoE applications:

1. Integrated PD Controller: The IC integrates a complete power device (PD) controller, eliminating the need for external components and reducing system complexity.
2. Auto-Classification: It supports automatic classification of connected devices according to the IEEE 802.3af/at standards, ensuring proper power delivery.
3. Current Limiting: The TPS23757PW incorporates a current limit function to protect both the powered device and the power sourcing equipment from excessive current.
4. Thermal Shutdown: In case of overheating, the IC automatically shuts down to prevent damage, enhancing system safety.
5. Undervoltage Lockout: It includes undervoltage lockout protection to ensure stable operation even under low voltage conditions.

Advantages and Disadvantages

Advantages

• Simplifies PoE implementation by integrating all necessary functions into a single IC.
• Supports both IEEE 802.3af and IEEE 802.3at standards, providing compatibility with a wide range of PoE devices.
• Offers high efficiency and low power dissipation, resulting in optimal power delivery.
• Built-in protection mechanisms enhance system reliability.

Disadvantages

• Limited output current capability compared to some other PoE ICs.
• Requires careful consideration of thermal management due to power dissipation.

Working Principles

The TPS23757PW operates based on the principles of PoE technology. It utilizes the power sourcing equipment (PSE) to deliver power over Ethernet cables to the powered device (PD). The IC performs the following key functions:

1. Detection: The TPS23757PW detects the presence of a PD by monitoring the resistance across the Ethernet cable.
2. Classification: It automatically classifies the connected PD according to the IEEE 802.3af/at standards, determining the power requirements.
3. Current Limiting: The IC limits the output current to protect both the PSE and PD from excessive current.
4. Power Delivery: Once the PD is detected and classified, the TPS23757PW delivers the appropriate power level to the PD through the Ethernet cable.

Detailed Application Field Plans

The TPS23757PW finds extensive application in various PoE-enabled devices, including but not limited to:

1. IP Phones: Enables power delivery to IP phones, eliminating the need for separate power adapters.
2. Wireless Access Points: Provides power