LTC4417 Supply Prioritizer

Linear Technology introduces the prioritized PowerPath™ controller

Image of Linear Technology's LTC4417 Supply PrioritizerLinear Technology's LTC4417 connects one of three valid power supplies to a common output based on priority. Priority is defined by pin assignment, with V1 assigned the highest priority and V3 the lowest priority. A power supply is defined as valid when its voltage has been within its overvoltage (OV) and undervoltage (UV) window continuously for at least 256 ms. If the highest priority valid input falls out of the OV/UV window, the channel is immediately disconnected and the next highest priority valid input is connected to the common output. Two or more LTC4417s can be cascaded to provide switchover between more than three inputs.

The LTC4417 incorporates fast non-overlap switching circuitry to prevent both reverse and cross conduction while minimizing output droop. The gate driver includes a 6 V clamp to protect external MOSFETs. A controlled output ramp feature minimizes start-up inrush current. Open drain VALID outputs indicate the input supplies have been within their OV/UV window for 256 ms.

VideoPrioritized PowerPath Controllers

Image of Linear Technology's LTC4417 Supply Prioritizer - Typical Application Image of Linear Technology's LTC4417 Supply Prioritizer - Graph
Features
  • Selects highest priority supply from three inputs
  • Blocks reverse and cross conduction currents
  • Wide operating voltage range: 2.5 V to 36 V
  • -42 V protection against reverse battery connection
  • Fast switchover minimizes output voltage droop
  • Low 28 µA operating current
  • P-channel MOSFET gate protection clamp
  • < 1 µA current draw from supplies less than VOUT
  • 1.5% input OV/UV protection
  • Adjustable OV/UV hysteresis
  • Cascadable for additional input supplies
  • 24-lead narrow SSOP and 4 mm x 4 mm QFN packages
Applications
  • Industrial handheld instruments
  • High availability systems
  • Battery backup systems
  • Servers and computer peripherals

LTC4417 Supply Prioritizer

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC OR CTRLR SRC SELECT 24QFNLTC4417CUF#PBFIC OR CTRLR SRC SELECT 24QFN2428 - ImmediateView Details
IC OR CTRLR SRC SELECT 24QFNLTC4417IUF#PBFIC OR CTRLR SRC SELECT 24QFN0View Details
IC OR CTRLR SRC SELECT 24SSOPLTC4417IGN#PBFIC OR CTRLR SRC SELECT 24SSOP841 - ImmediateView Details
IC OR CTRLR SRC SELECT 24QFNLTC4417HUF#PBFIC OR CTRLR SRC SELECT 24QFN786 - Immediate
1092 - Factory Stock
View Details
IC OR CTRLR SRC SELECT 24SSOPLTC4417HGN#PBFIC OR CTRLR SRC SELECT 24SSOP330 - Immediate
1815 - Factory Stock
View Details
IC OR CTRLR SRC SELECT 24SSOPLTC4417CGN#PBFIC OR CTRLR SRC SELECT 24SSOP215 - Immediate
1265 - Factory Stock
View Details

LTC4417 Supply Prioritizer Demo Board

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
BOARD DEMO LTC4417DC1717ABOARD DEMO LTC441713 - Immediate
246 - Factory Stock
View Details
Published: 2017-10-02