Overview

Features and Benefits

  • Very High Efficiency: Over 95% Possible
  • Wide VIN Range: 3.5V to 16V
  • Current Mode Operation for Excellent Line and Load Transient Response
  • High Efficiency Maintained Over Three Decades of Output Current
  • Low 160µA Standby Current at Light Loads
  • Logic Controlled Micropower Shutdown: IQ <20µA
  • Short-Circuit Protection
  • Very Low Dropout Operation: 100% Duty Cycle
  • High Efficiency in a Small Amount of Board Space
  • Output Can Be Externally Held High in Shutdown
  • Available in 8-Pin SO Package

Product Details

The LTC1147 series are step-down switching regulator controllers featuring automatic BurstMode operation to maintain high efficiencies at low output currents. These devices drive an external P-channel power MOSFET at switching frequencies exceeding 400kHz using a constant off-time current mode architecture providing constant ripple current in the inductor.

The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 14V (16V maximum). Constant off-time architecture provides low dropout regulation limited by only the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor.

The LTC1147 series incorporates automatic power saving Burst Mode operation to reduce switching losses when load currents drop below the level required for continuous operation. Standby power is reduced to only 2mW at VIN = 10V (at IOUT = 0). Load currents in Burst Mode operation are typically 0mA to 300mA.

For applications where even higher efficiency is required, refer to the LTC1148 data sheet and Application Note 54.

Applications

  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery-Operated Digital Devices
  • Cellular Telephones
  • DC Power Distribution Systems
  • GPS Systems

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice

Models for the following parts are available in LTspice:

LTC1147-3
LTC1147-3.3
LTC1147-5
LTC1147L
LTC1147L-3
LTC1147L-3.3

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Sample & Buy

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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