Key facts
- Brand
- Linear Technology
- Model
- LTC4257
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-09
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Linear Technology LTC4257 Datasheet
The LTC4257 is a Power over Ethernet (PoE) PD interface controller that integrates a 25 kΩ signature resistor, classification current source, input‑current limit with thermal foldback, undervoltage lockout, and power‑good signalling in an 8‑lead package. It is intended for IP phones, wireless access points and other IEEE 802.3af powered devices.
The datasheet provides absolute maximum ratings, electrical characteristics, pin descriptions, package dimensions, typical performance curves, and application notes on detection, classification and thermal protection. It also lists ordering information for the SO and DFN package variants.
Linear Technology LTC4257 specifications
| Maximum Supply Voltage (Vin) | -57 V |
|---|---|
| Power Good Output Low Voltage | 1 mA |
| Thermal Shutdown Trip Temperature | 140 °C |
Source: Linear Technology LTC4257 IEEE 802.3af PD Interface Controller Datasheet
All Linear Technology LTC4257 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the maximum operating voltage for the LTC4257?
The LTC4257 can operate up to a maximum supply voltage of –57 V.
From: Linear Technology LTC4257 IEEE 802.3af PD Interface Controller Datasheet