LTC3122
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LTC3122

15V, 2.5A Synchronous Step-Up DC/DC Converter with Output Disconnect

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LTspice LTC3122 Demo Circuit - 5V to 12V Synchronous Boost Converter with Output Disconnect (1.8-5.5V to 12V @ 0.8A) Download 2.00KB LTspice LTC3122 Demo Circuit - Dual Supercapacitor Backup Power Supply (0.5-5V to 5V @ 50mA) Download 3.00KB
Part Models 10
1ku List Price Starting From $2.81
Features
  • VIN Range: 1.8V to 5.5V, 500mV After Start-Up
  • Output Voltage Range: 2.2V to 15V
  • 800mA Output Current for VIN = 5V and VOUT = 12V
  • Output Disconnects from Input When Shut Down
  • Synchronous Rectification: Up to 95% Efficiency
  • Inrush Current Limit
  • Up to 3MHz Adjustable Switching Frequency Synchronizable to External Clock
  • Selectable Burst Mode® Operation: 25μA IQ
  • Output Overvoltage Protection
  • Soft-Start
  • <1μA IQ in Shutdown
  • 12-Lead, 3mm × 4mm × 0.75mm Thermally Enhanced DFN and MSOP Packages
Additional Details
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The LTC3122 is a synchronous step-up DC/DC converter with true output disconnect and inrush current limiting. The 2.5A current limit along with the ability to program output voltages up to 15V makes the LTC3122 well suited for a variety of demanding applications. Once started, operation will continue with inputs down to 500mV, extending runtime in many applications.

The LTC3122 features output disconnect in shutdown, dramatically reducing input power drain and enabling VOUT to completely discharge. Adjustable PWM switching from 100kHz to 3MHz optimizes applications for highest efficiency or smallest solution footprint. The oscillator can also be synchronized to an external clock for noise sensitive applications. Selectable Burst Mode operation reduces quiescent current to 25μA, ensuring high efficiency across the entire load range. An internal soft-start limits inrush current during start-up.

Other features include a <1μA shutdown current and robust protection under short-circuit, thermal overload, and output overvoltage conditions. The LTC3122 is offered in both a low profile 12-lead (3mm × 4mm × 0.75 mm) DFN package and a 12-lead thermally enhanced MSOP package.

Applications

  • RF Power
  • Piezo Actuators
  • Small DC Motors
  • 12V Analog Rail From Battery, 5V, or Backup Capacitor
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file View Data Sheet
Documentation View All Documentation
LTspice LTC3122 Demo Circuit - 5V to 12V Synchronous Boost Converter with Output Disconnect (1.8-5.5V to 12V @ 0.8A) Download 2.00KB LTspice LTC3122 Demo Circuit - Dual Supercapacitor Backup Power Supply (0.5-5V to 5V @ 50mA) Download 3.00KB
Part Models 10
1ku List Price Starting From $2.81
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LTC3122

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UPDATED 04/03/2015
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LTC3122: 15V, 2.5A Synchronous Step-Up DC/DC Converter with Output Disconnect Data Sheet

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UPDATED 09/19/2012
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LTC3122: 出力切断機能を備えた15V、2.5A同期整流式の昇圧DC/DCコンバータ データシート

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UPDATED 08/24/2012
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DC1764A - Demo Manual redirect icon

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Reliability Data

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UPDATED 03/26/2018
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R526 Reliability Data redirect icon

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UPDATED 05/29/2013
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DN516 - 1μA IQ Synchronous Boost Converter Extends Battery Life in Portable Devices redirect icon

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DN516 - 静止電流1μA の同期整流式昇圧コンバータによる、 携帯デバイスのバッテリ寿命の延長 redirect icon

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Documentation

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
LTC3122EDE#PBF 12-Lead DFN (4mm x 3mm w/ EP) external-link
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LTC3122EDE#TRPBF 12-Lead DFN (4mm x 3mm w/ EP) external-link
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LTC3122EMSE#PBF 12-Lead MSOP w/ EP external-link
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LTC3122EMSE#TRPBF 12-Lead MSOP w/ EP external-link
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LTC3122HMSE#PBF 12-Lead MSOP w/ EP external-link
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LTC3122HMSE#TRPBF 12-Lead MSOP w/ EP external-link
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LTC3122IDE#PBF 12-Lead DFN (4mm x 3mm w/ EP) external-link
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LTC3122IDE#TRPBF 12-Lead DFN (4mm x 3mm w/ EP) external-link
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LTC3122IMSE#PBF 12-Lead MSOP w/ EP external-link
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LTC3122IMSE#TRPBF 12-Lead MSOP w/ EP external-link
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Feb 4, 2020

- 20_0129

Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3122EMSE#PBF

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LTC3122EMSE#TRPBF

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LTC3122HMSE#PBF

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Oct 11, 2022

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package

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LTC3122HMSE#TRPBF

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Apr 18, 2022

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

LTC3122HMSE#PBF

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LTC3122HMSE#TRPBF

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Feb 4, 2020

- 20_0129

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Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3122EMSE#PBF

PRODUCTION

LTC3122EMSE#TRPBF

PRODUCTION

LTC3122HMSE#PBF

PRODUCTION

LTC3122HMSE#TRPBF

PRODUCTION

LTC3122IMSE#PBF

PRODUCTION

LTC3122IMSE#TRPBF

PRODUCTION

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PCN20_0129_Form

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Material_Report

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Oct 11, 2022

- 22_0244

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC3122HMSE#PBF

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LTC3122HMSE#TRPBF

PRODUCTION

pdf

PCN22_0244_Form

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xls

Material_Report

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pdf

Qualification Results Summary

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xlsm

Delta Qualification Matrix

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Apr 18, 2022

- 22_0050

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

LTC3122HMSE#PBF

PRODUCTION

LTC3122HMSE#TRPBF

PRODUCTION

pdf

PCN22_0050_Form

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xls

Material_Report

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Qualification Results Summary

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RECOMMENDED FOR NEW DESIGNS

15V, 5A 2-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect

Evaluation Kit

Evaluation Kits 1

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DC1764A

LTC3122EDE Demo Board I 1.8V to 5.5VIN, 12VOUT @ 0.8A

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DC1764A

LTC3122EDE Demo Board I 1.8V to 5.5VIN, 12VOUT @ 0.8A

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DC1764A
LTC3122EDE Demo Board I 1.8V to 5.5VIN, 12VOUT @ 0.8A
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Product Detail

Demonstration circuit 1764A is a 5.5V input, 12V output at 800mA synvhronous boost DC/DC power supply featuring the LTC3122. The IC includes internal high and low side 2.5A switches and features selectable PWM or Burst Mode® operation for high efficiency at low output current. The board operates from an input voltage as low as 1.8V and continues to operate down to 500mV once started. The output is fixed at 12V although other voltages between 2.2V and 15V can be selected by resistor changes.


The IC includes soft-start and input current limit, adjustable switching frequency with the ability to synchronize to an external clock, and output overvoltage protection with output disconnect.

Resources

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DC1764A - Schematic Download

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DC1764A - Design Files Download

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DC1764A - Demo Manual Download

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Evaluation Kits1

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DC1764A

LTC3122EDE Demo Board I 1.8V to 5.5VIN, 12VOUT @ 0.8A
Tools & Simulations

Tools & Simulations 2

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.

spice tool Lt Spice

LTC3122 Demo Circuit - 5V to 12V Synchronous Boost Converter with Output Disconnect (1.8-5.5V to 12V @ 0.8A) Download

2.00K

spice tool Lt Spice

LTC3122 Demo Circuit - Dual Supercapacitor Backup Power Supply (0.5-5V to 5V @ 50mA) Download

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