Overview

Features and Benefits

  • 5V Output Current: 100mA (VIN ≥ 3V)
  • 3.3V Output Current: 80mA (VIN ≥ 2.5V)
  • Ultralow Power: 20µA Quiescent Current
  • Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ
  • VIN Range: 2V to 5.5V
  • 800kHz Switching Frequency
  • No Inductors
  • Very Low Shutdown Current: <2µA
  • Shutdown Disconnects Load from VIN
  • PowerGood/Undervoltage Output
  • Adjustable Soft-Start Time
  • Short-Circuit/Thermal Protection
  • Available in 8-Pin MSOP

Product Details

The LTC1751 family are micropower charge pump DC/DC converters that produce a regulated output voltage at up to 100mA. The input voltage range is 2V to 5.5V. Extremely low operating current (20µA typical with no load) and low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make them ideally suited for small, battery-powered applications.

The LTC1751 family operate as Burst Mode switched capacitor voltage doublers to achieve ultralow quiescent current. They have thermal shutdown capability and can survive a continuous short circuit from Vout to GND. The PGOOD pin on the LTC1751-3.3 and LTC1751-5 indicates when the output voltage has reached its final value and if the output has an undervoltage fault condition. The FB pin of the adjustable LTC1751 can be used to program the desired output voltage or current. An optional soft-start capacitor may be used at the SS pin to prevent excessive inrush current during start-up.

The LTC1751 family is available in an 8-pin MSOP package.

Applications

  • Li-Ion Battery Backup Supplies
  • Local 3V and 5V Conversion
  • Smart Card Readers
  • PCMCIA Local 5V Supplies
  • White LED Backlighting

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 (3)

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:

LTC1751
LTC1751-3
LTC1751-3.3
LTC1751-5

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.


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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.