LTC1473L

PRODUCTION

Dual Low Voltage PowerPath™ Switch Driver

Data Sheet Product Selection Table
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Overview

  • Power Path Management for Systems with Multiple DC Sources
  • Switches and Isolates Sources from 3.3V to 10V
  • All N-Channel Switching to Reduce Power Losses and System Cost
  • Built-In Step-Up Regulator for N-Channel Gate Drive
  • Capacitor Inrush and Short-Circuit Current Limited
  • User-Programmable Timer Prevents Overdissipation During Current Limiting
  • Undervoltage Lockout Prevents Operation with Low Inputs
  • Small Footprint: 16-Pin Narrow SSOP

The LTC1473L provides reliable and efficient switching between two DC power sources. This device drives two external sets of back-to-back N-channel MOSFET switches to route power to the input of a low voltage system. An internal boost regulator provides the voltage to fully enhance the logic-level N-channel MOSFET switches while an internal undervoltage lock-out circuit keeps the system alive down to 2.8V.

The LTC1473L senses current to limit inrush between the batteries and the system supply capacitor during switch-over transitions or during fault conditions. A user-programmable timer monitors the time the MOSFET switches are in current limit and latches them off when the programmed time is exceeded.

A unique “2-diode” logic mode ensures system start-up regardless of which input receives power first.

Applications

  • Portable Computers
  • Portable Instruments
  • Fault Tolerant Computers
  • Battery-Backup Systems
  • 3.3V/5V Power Management
LTC1473L
Dual Low Voltage PowerPath™ Switch Driver
Product Package 1 3.3V to 4-Cell NiMH Backup Switch
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

Data Sheet

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1473L
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