LT4275 PD Controller

By Analog Devices Inc 184

LT4275 PD Controller

The LT4275 from Linear Technology is a pin-for-pin compatible family of IEEE 802.3 and LTPoE++ powered device (PD) controllers.

The LT4275A employs a proprietary LTPoE++ classification scheme, delivering 38.7 W, 52.7 W, 70 W, or 90 W of power at the PD RJ45 connector. The LT4275A is fully compatible with IEEE 802.3. The LT4275B is an IEEE 802.3at compliant, Type 2 (PoE+) PD delivering up to 25.5 W.

The LT4275 internal charge pump provides an N-channel MOSFET solution, eliminating a larger and more costly P-channel MOSFET. A low RDS(ON) MOSFET also maximizes power delivery and efficiency, reduces power and heat dissipation, and eases thermal design. Startup inrush current is adjustable with an external capacitor. The LT4275 also includes a power good output, on-board signature resistor, under-voltage lockout, and thermal protection. The LT4275A / LT4275B drives a single opto-coupler to indicate the power level of the attached PSE. Pin-selectable support for non-standard low voltage operation is provided. Auxiliary power override is supported with the AUX pin.

  • 100 V absolute maximum input voltage
  • Wide junction temperature range (-40°C to 125°C)
  • Over-temperature protection
  • Integrated signature resistor
  • Available in 10-lead MSOP and 3 mm x 3 mm DFN packages
  • External Hot Swap™ N-channel MOSFET for lowest power dissipation and highest system efficiency
  • Programmable aux power support as low as 9 V
  • Optional support of non-standard low voltage PoE
  • High power wireless data systems
  • Outdoor security camera equipment
  • Commercial and public information displays
  • High temperature industrial applications