LTC3251
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LTC3251

500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters

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LTspice LTC3251 - Inductorless (Charge Pump) DC/DC Converters Download 1.32 KB
Part Models 6
1ku List Price Starting From $2.60
Features
  • Up to 500mA Output Current
  • No Inductors
  • 2.7V to 5.5V Input Voltage Range
  • 2x Efficiency Improvement Over LDOs
  • 2-Phase, Spread Spectrum Operation for Low Input and Output Noise
  • Shutdown Disconnects Load from VIN
  • Adjustable Output Voltage Range: 0.9V to 1.6V
    • Fixed Output Voltages: 1.2V, 1.5V
  • Super Burst, Burst and Burst Defeat Operating Modes
  • Low Operating Current: IIN = 35µA (Burst Mode® Operation)
  • Super Burst Operating Current: IIN = 10µA
  • Low Shutdown Current: IIN = 0.01µA Typ
  • Soft-Start Limits Inrush Current at Turn-On
  • Short-Circuit and Overtemperature Protected
  • Available in a Thermally Enhanced 10-Pin MSOP Package
Additional Details
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The LTC3251/LTC3251-1.2/LTC3251-1.5 are 2-phase charge pump step-down DC/DC converters that produce a regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve twice the typical efficiency of a linear regulator. No inductors are required. VOUT is resistor programmable from 0.9V to 1.6V or fixed at 1.2V or 1.5V, with up to 500mA of load current available.

A unique 2-phase spread spectrum architecture provides a very low noise regulated output as well as low noise at the input. The parts have four operating modes: Continuous Spread Spectrum, Spread Spectrum with Burst Mode operation, Super Burst™ mode operation and shutdown.

Low operating current (35µA in Burst Mode operation, 10µA in Super Burst mode operation) and low external parts count make the LTC3251/LTC3251-1.2/LTC3251-1.5 ideally suited for space-constrained battery-powered applications. The parts are short-circuit and over-temperature protected, and are available in a thermally enhanced 10-pin MSOP package.

Applications

  • Handheld Devices
  • Cellular Phones
  • Portable Electronic Equipment
  • DSP Power Supplies
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Documentation View All Documentation
LTspice LTC3251 - Inductorless (Charge Pump) DC/DC Converters Download 1.32 KB
Part Models 6
1ku List Price Starting From $2.60
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LTC3251

Documentation

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Data Sheet

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UPDATED 08/24/2007
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LTC3251: 500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters Data Sheet

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UPDATED 08/09/2004
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LTC3251: 500mA、高効率、低ノイズ、インダクタ不要の降圧DC/DCコンバータ データシート

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User Guide

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UPDATED 09/24/2009
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DC506A - Demo Manual redirect icon

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Reliability Data

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UPDATED 03/23/2018
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Design Note

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UPDATED 11/04/2022
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Design Note 310: New Step-Down Charge Pumps are Tiny, Efficient and Very Low Noise redirect icon

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Documentation

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. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3251EMSE#PBF 10-Lead MSOP w/ EP external-link
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LTC3251EMSE#TRPBF 10-Lead MSOP w/ EP external-link
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LTC3251EMSE-1.2#PBF 10-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
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LTC3251EMSE-1.2#TRPBF 10-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3251EMSE-1.5#PBF 10-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
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LTC3251EMSE-1.5#TRPBF 10-Lead MSOP w/ EP external-link
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Jun 5, 2024

- 24_0003

Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LTC3251EMSE#PBF

PRODUCTION

LTC3251EMSE#TRPBF

PRODUCTION

LTC3251EMSE-1.2#PBF

PRODUCTION

LTC3251EMSE-1.2#TRPBF

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LTC3251EMSE-1.5#PBF

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LTC3251EMSE-1.5#TRPBF

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Qualification Results Summary

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Delta Qualification Matrix

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Feb 4, 2020

- 20_0130

Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3251EMSE#PBF

PRODUCTION

LTC3251EMSE#TRPBF

PRODUCTION

LTC3251EMSE-1.2#PBF

PRODUCTION

LTC3251EMSE-1.2#TRPBF

PRODUCTION

LTC3251EMSE-1.5#PBF

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LTC3251EMSE-1.5#TRPBF

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PCN20_0130_Form

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Material_Report

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Jun 5, 2024

- 24_0003

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LTC3251EMSE#PBF

PRODUCTION

LTC3251EMSE#TRPBF

PRODUCTION

LTC3251EMSE-1.2#PBF

PRODUCTION

LTC3251EMSE-1.2#TRPBF

PRODUCTION

LTC3251EMSE-1.5#PBF

PRODUCTION

LTC3251EMSE-1.5#TRPBF

PRODUCTION

pdf

PCN24_0003_Form

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xls

Material_Report

Download

pdf

Qualification Results Summary

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xlsm

Delta Qualification Matrix

Download
Feb 4, 2020

- 20_0130

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Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3251EMSE#PBF

PRODUCTION

LTC3251EMSE#TRPBF

PRODUCTION

LTC3251EMSE-1.2#PBF

PRODUCTION

LTC3251EMSE-1.2#TRPBF

PRODUCTION

LTC3251EMSE-1.5#PBF

PRODUCTION

LTC3251EMSE-1.5#TRPBF

PRODUCTION

pdf

PCN20_0130_Form

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Material_Report

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Software & Part Ecosystem

Evaluation Kits 1

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DC506A

LTC3251EMSE Demo Board | Spread-Spectrum, Low Noise, Inductorless Step-Down Charge Pump, 3.2V ≤ VIN ≤ 5.5V, VOUT @ Up to 500mA

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DC506A

LTC3251EMSE Demo Board | Spread-Spectrum, Low Noise, Inductorless Step-Down Charge Pump, 3.2V ≤ VIN ≤ 5.5V, VOUT @ Up to 500mA

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DC506A
LTC3251EMSE Demo Board | Spread-Spectrum, Low Noise, Inductorless Step-Down Charge Pump, 3.2V ≤ VIN ≤ 5.5V, VOUT @ Up to 500mA
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Product Detail

Demonstration circuit 506A is a two-phase, step down charge pump DC/DC converter featuring the LTC3251EMSE. It produces a regulated 1.5V output voltage at up to 500mA of output current from a 3.2V to 5.5V input. The LTC3251's unique two-phase, spread spectrum architecture provides high efficient and low noise operation.

Resources

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DC506A - Schematic Download

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DC506A - Design File Download

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DC506A - Demo Manual Download

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Evaluation Kits1

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DC506A

LTC3251EMSE Demo Board | Spread-Spectrum, Low Noise, Inductorless Step-Down Charge Pump, 3.2V ≤ VIN ≤ 5.5V, VOUT @ Up to 500mA

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LTC3251 - Inductorless (Charge Pump) DC/DC Converters Download

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