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Product Detailed Parameters
- Description：IC POE CNTRL 1 CHANNEL 8DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Type：Controller (PD)
- Number of Channels：1
- Power - Max：12.95 W
- Internal Switch(s)：Yes
- Auxiliary Sense：No
- Standards：802.3af (PoE)
- Voltage - Supply：57V (Max)
- Current - Supply：3mA
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：8-WFDFN Exposed Pad
- Supplier Device Package：8-DFN (3x3)
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Overview
The LTC4257IDD#PBF is a Powered Device (PD) power switch IC compliant with IEEE 802.3af standards, manufactured by Analog Devices Inc. It operates within a supply voltage range of -57 V and features a maximum on-resistance of 2 Ohms. The device limits input current to 375 mA and draws a typical operating supply current of 3 mA. Designed for surface mount applications, it is housed in an 8-lead DFN package. The component supports an operating temperature range from -40°C to +85°C, ensuring reliable performance in standard industrial environments.
Feature Summary
- Complies with IEEE 802.3af Powered Device standards
- Integrated high-voltage power switch with current limiting
- Low quiescent current operation for energy efficiency
Applications
- Power over Ethernet (PoE) powered devices
- LAN interface power management circuits
- Industrial communication equipment requiring PoE integration
Procurement Notes
Verify the exact part number suffix carefully. The provided model lacks the specific '-1' designation found in official documentation for this series. Confirm whether the required component is the LTC4257IDD-1#PBF or the base LTC4257IDD#PBF variant, as functional differences may exist between family members. Cross-reference the manufacturer's ordering guide to ensure the correct electrical specifications are met for the design.
Selection Notes
Select this component for applications requiring strict adherence to IEEE 802.3af PD protocols. Ensure the system design accommodates the -57 V operating voltage range and the 375 mA current limit. Verify that the DFN-8 package footprint matches the PCB layout constraints. Consider thermal dissipation requirements given the 2 Ohm on-resistance under load conditions.
Part Context
This component belongs to the LTC4257 family of Power Switch ICs designed specifically for PoE/LAN applications. It serves as a critical interface element for powering networked devices via Ethernet cables. The series is characterized by its compliance with legacy PoE standards and robust protection features against over-current and over-voltage events common in LAN environments.
