Overview

Features and Benefits

  • Dual N-Channel MOSFET Synchronous Drive
  • Programmable/Synchronizable Fixed Frequency
  • VOUT Range: 0.8V to 7V
  • Wide VIN Range: 3.5V to 36V Operation
  • Very Low Dropout Operation: 99% Duty Cycle
  • OPTI-LOOP Compensation Minimizes COUT
  • ±1% Output Voltage Accuracy
  • Power Good Output Voltage Monitor
  • Internal Current Foldback
  • Output Overvoltage Crowbar Protection
  • Latched Short-Circuit Shutdown Timer with Defeat Option
  • Optional Programmable Soft-Start
  • Remote Output Voltage Sense
  • Logic Controlled Micropower Shutdown: IQ < 25µA
  • Available in 16-Lead Narrow SSOP and SO Packages

Product Details

The LTC1735-1 is a synchronous step-down switching regulator controller optimized for CPU power. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.

The operating frequency (synchronizable up to 500kHz) is set by an external capacitor allowing maximum flexibility in optimizing efficiency. The output voltage is monitored by a power good window comparator that indicates when the output is within 7.5% of its programmed value, conforming to Intel Mobile CPU Specifications.

Protection features include internal foldback current limiting, output overvoltage crowbar and optional short-circuit shutdown. Soft-start is provided by an external capacitor that can be used to properly sequence supplies. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum).

Pin defeatable Burst Mode operation provides high efficiency at low load currents while 99% duty cycle provides low dropout operation.


Features
LTC1735 -
LTC1735-1 Power Good

Applications

  • Notebook and Palmtop Computers, PDAs
  • Power Supply for Mobile Pentium® III Processor with SpeedStep Technology
  • Cellular Telephones and Wireless Modems

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:

LTC1735
LTC1735-1

Product Recommendations

LTC1735-1 Companion Parts

Recommended Related Parts

Recommended Suggested Oscillator

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.

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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.


Price Table Help

 

Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.