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LTC4257IS8-1#PBF
Product Overview
Category
The LTC4257IS8-1#PBF belongs to the category of integrated circuits (ICs) and specifically falls under the power management ICs.
Use
This product is primarily used for power sourcing equipment (PSE) applications in Power over Ethernet (PoE) systems. It provides a complete solution for managing power delivery to powered devices (PDs) over Ethernet cables.
Characteristics
- Package: LTC4257IS8-1#PBF is available in an 8-pin SOIC package.
- Essence: It is designed to simplify the implementation of PoE systems by integrating various functions into a single IC.
- Packaging/Quantity: The LTC4257IS8-1#PBF is typically sold in reels or tubes, with a standard quantity of 250 units per reel/tube.
Specifications
The LTC4257IS8-1#PBF offers the following specifications:
- Input Voltage Range: 36V to 57V
- Output Voltage Range: 2.5V to 57V
- Maximum Output Current: 400mA
- Operating Temperature Range: -40°C to 85°C
- Power Dissipation: 1.25W
Detailed Pin Configuration
The LTC4257IS8-1#PBF features the following pin configuration:
- VCC - Power supply input
- GND - Ground reference
- EN - Enable pin for controlling the device operation
- FLT - Fault indicator output
- POK - Power OK indicator output
- VOUT - Output voltage pin
- VREF - Reference voltage output
- NC - No connection
Functional Features
The LTC4257IS8-1#PBF offers several functional features, including:
- Integrated IEEE 802.3af-compliant PD interface
- Programmable current limit and undervoltage lockout
- Integrated signature resistor for PD detection
- Fault detection and reporting
- Power good indicator output
Advantages and Disadvantages
Advantages of the LTC4257IS8-1#PBF include:
- Simplifies implementation of PoE systems
- Integration of multiple functions into a single IC
- Programmable current limit allows customization
- Comprehensive fault detection and reporting
Disadvantages of the LTC4257IS8-1#PBF include:
- Limited maximum output current (400mA)
- Restricted operating temperature range (-40°C to 85°C)
Working Principles
The LTC4257IS8-1#PBF operates based on the IEEE 802.3af standard for PoE. It integrates the necessary circuitry to detect and classify powered devices, manage power delivery, and monitor fault conditions. The device communicates with the PD through the Ethernet cable, ensuring safe and efficient power transfer.
Detailed Application Field Plans
The LTC4257IS8-1#PBF finds applications in various fields, including:
- IP telephony systems
- Wireless access points
- Security cameras
- Industrial automation equipment
- Building management systems
Detailed and Complete Alternative Models
Some alternative models that offer similar functionality to the LTC4257IS8-1#PBF are:
- LTC4260-1 - Power over Ethernet Interface Controller
- MAX5941 - IEEE 802.3af/at PD Controller
- TPS23753A - PoE Interface and DC/DC Controller
These alternative models provide comparable features and can be considered as substitutes for the LTC4257IS8-1#PBF in PoE applications.
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10 domande e risposte comuni relative all'applicazione di LTC4257IS8-1#PBF nelle soluzioni tecniche
Sure! Here are 10 common questions and answers related to the application of LTC4257IS8-1#PBF in technical solutions:
Q1: What is LTC4257IS8-1#PBF? A1: LTC4257IS8-1#PBF is a specific model number for a power sourcing equipment (PSE) controller IC manufactured by Linear Technology (now part of Analog Devices). It is used in Power over Ethernet (PoE) applications.
Q2: What is the purpose of LTC4257IS8-1#PBF? A2: The LTC4257IS8-1#PBF is designed to provide power and control functions for PoE systems. It enables the PSE to detect, classify, and provide power to connected powered devices (PDs) over Ethernet cables.
Q3: What are the key features of LTC4257IS8-1#PBF? A3: Some key features of LTC4257IS8-1#PBF include IEEE 802.3af-compliant PD detection and classification, programmable current limit, thermal shutdown protection, and support for various power management functions.
Q4: How does LTC4257IS8-1#PBF detect and classify PDs? A4: LTC4257IS8-1#PBF uses a combination of signature detection and classification methods defined by the IEEE 802.3af standard to identify and categorize connected PDs based on their power requirements.
Q5: Can LTC4257IS8-1#PBF be used in both 10/100Mbps and Gigabit Ethernet applications? A5: Yes, LTC4257IS8-1#PBF is compatible with both 10/100Mbps and Gigabit Ethernet applications. It supports auto-negotiation and can adapt to different link speeds.
Q6: What is the maximum power that LTC4257IS8-1#PBF can deliver to a PD? A6: The maximum power that LTC4257IS8-1#PBF can deliver depends on the external power supply and the current limit set by the system designer. It complies with the IEEE 802.3af standard, which specifies a maximum power delivery of 15.4W per port.
Q7: Can LTC4257IS8-1#PBF be used in PoE+ (IEEE 802.3at) applications? A7: No, LTC4257IS8-1#PBF is designed for IEEE 802.3af-compliant PoE applications. For PoE+ applications, you would need a different PSE controller that supports the higher power requirements specified by the IEEE 802.3at standard.
Q8: What are the typical applications of LTC4257IS8-1#PBF? A8: LTC4257IS8-1#PBF is commonly used in various PoE-enabled devices such as IP phones, wireless access points, security cameras, and other network-connected devices that require both data and power over Ethernet cables.
Q9: Does LTC4257IS8-1#PBF require any external components? A9: Yes, LTC4257IS8-1#PBF requires external components such as resistors, capacitors, and an inductor to implement the complete PSE circuitry. The specific component values and configurations depend on the application requirements.
Q10: Where can I find more information about LTC4257IS8-1#PBF? A10: You can find detailed information about LTC4257IS8-1#PBF, including its datasheet, application notes, and technical support resources on the Analog Devices website or by contacting their customer support team.