LTC1871

PRODUCTION

LTC1871

Wide Input Range, No R_SENSE^™ Current Mode Boost, Flyback and SEPIC Controller

PRODUCTION

High Efﬁ ciency 3.3V Input, 5V Output Boost Converter (Bootstrapped) slide

High Efﬁ ciency 3.3V Input, 5V Output Boost Converter (Bootstrapped)

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Part Models 7

1ku List Price Starting From $3.19

Features

High Efficiency (No Sense Resistor Required)
Wide Input Voltage Range: 2.5V to 36V
Current Mode Control Provides Excellent Transient Response
High Maximum Duty Cycle (92% Typ)
±2% RUN Pin Threshold with 100mV Hysteresis
±1% Internal Voltage Reference
Micropower Shutdown: I_Q = 10μA
Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor
Synchronizable to an External Clock Up to 1.3 × f_OSC
User-Controlled Pulse Skip or Burst Mode^® Operation
Internal 5.2V Low Dropout Voltage Regulator
Output Overvoltage Protection
Capable of Operating with a Sense Resistor for High Output Voltage Applications
Small 10-Lead MSOP Package

Additional Details

The LTC1871 is a wide input range, current mode, boost, flyback or SEPIC controller that drives an N-channel power MOSFET and requires very few external components. Intended for low to medium power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maximizing efficiency.

The IC’s operating frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 2.5V and a low shutdown quiescent current of 10μA make the LTC1871 ideally suited for battery-operated systems.

For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/ SYNC pin. Higher output voltage boost, SEPIC and flyback applications are possible with the LTC1871 by connecting the SENSE pin to a resistor in the source of the power MOSFET.

The LTC1871 is available in the 10-lead MSOP package.


	Vin Range	INTVcc	Features
LTC1871	2.5V to 36V	5.2V	-
LTC1871-1	2.5V to 36V	5.2V	Lower Burst Mode Threshold (0.195V vs. 0.3V)
LTC1871-7	6V to 36V	7V	Drives 6V Gate N-Channel MOSFETs
LTC1871X	2.5V to 36V	5.2V	175°C Junction Temp, 100% Tested at 175°C

Applications

Telecom Power Supplies
Portable Electronic Equipment

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 7

1ku List Price Starting From $3.19

Technical Documents 9

LTC1871: Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller Data Sheet 01/29/2008

R384 Reliability Data 03/26/2018

DC414B - Demo Manual 08/31/2015

DC415A - Demo Manual 07/25/2011

DN296 - LTC1871 No RSENSE Controller Is Small and Efficient in Boost, Flyback and SEPIC Applications 04/01/2014

Design Note 296: LTC1871 No R_SENSE Controller Is Small and Efficient in Boost, Flyback and SEPIC Applications 10/01/2002

Design Note 481: 2-Phase, Dual Output Synchronous Boost Converter Solves Thermal Problems in Harsh Environments 11/07/2022

Using Transformers in LTspice/Switcher CAD III 09/01/2006

The LTC1871 Achieves the Industry’s Highest Efficiency for Single-Ended Boost, Flyback and SEPIC Topologies 09/01/2001

Design Resources 7

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
LTC1871EMS#PBF	10-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1871EMS#TR	10-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1871EMS#TRPBF	10-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1871HMS#PBF	10-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1871HMS#TRPBF	10-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1871IMS#PBF	10-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1871IMS#TRPBF	10-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC1871EMS#PBF
Pin/Package Drawing
10-Lead MSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1871EMS#TR
Pin/Package Drawing
10-Lead MSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1871EMS#TRPBF
Pin/Package Drawing
10-Lead MSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1871HMS#PBF
Pin/Package Drawing
10-Lead MSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1871HMS#TRPBF
Pin/Package Drawing
10-Lead MSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1871IMS#PBF
Pin/Package Drawing
10-Lead MSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1871IMS#TRPBF
Pin/Package Drawing
10-Lead MSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Jun 5, 2024

- 24_0004

Epoxy Change from Henkel 8290 to 8290A for MSOP (3)

LTC1871EMS#PBF

PRODUCTION

LTC1871EMS#TRPBF

PRODUCTION

LTC1871IMS#PBF

PRODUCTION

LTC1871IMS#TRPBF

PRODUCTION

pdf

PCN24_0004_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Feb 4, 2020

- 20_0130

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

LTC1871EMS#PBF

PRODUCTION

LTC1871EMS#TR

LTC1871EMS#TRPBF

PRODUCTION

LTC1871HMS#PBF

PRODUCTION

LTC1871HMS#TRPBF

PRODUCTION

LTC1871IMS#PBF

PRODUCTION

LTC1871IMS#TRPBF

PRODUCTION

pdf

PCN20_0130_Form

xls

Material_Report

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC1871EMS#TR

LTC1871HMS#PBF

PRODUCTION

LTC1871HMS#TRPBF

PRODUCTION

pdf

PCN22_0244_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Jul 12, 2022

- 22_0157

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]

LTC1871HMS#PBF

PRODUCTION

LTC1871HMS#TRPBF

PRODUCTION

pdf

PCN22_0157_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Detailed Parts List

Jun 21, 2022

- 22_0050

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

LTC1871HMS#PBF

PRODUCTION

LTC1871HMS#TRPBF

PRODUCTION

pdf

PCN22_0050_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Aug 16, 2021

- 20_0040

Discontinuation of Lead Finished Parts for MSOP Package.

LTC1871EMS#TR

pdf

PDN20_0040_Form

xls

Material_Report

Filter by Model

Part Models

Product Lifecycle

PCN

Jun 5, 2024

- 24_0004

Epoxy Change from Henkel 8290 to 8290A for MSOP (3)

LTC1871EMS#PBF

PRODUCTION

LTC1871EMS#TRPBF

PRODUCTION

LTC1871IMS#PBF

PRODUCTION

LTC1871IMS#TRPBF

PRODUCTION

pdf

PCN24_0004_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Feb 4, 2020

- 20_0130

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

LTC1871EMS#PBF

PRODUCTION

LTC1871EMS#TR

LTC1871EMS#TRPBF

PRODUCTION

LTC1871HMS#PBF

PRODUCTION

LTC1871HMS#TRPBF

PRODUCTION

LTC1871IMS#PBF

PRODUCTION

LTC1871IMS#TRPBF

PRODUCTION

pdf

PCN20_0130_Form

xls

Material_Report

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC1871EMS#TR

LTC1871HMS#PBF

PRODUCTION

LTC1871HMS#TRPBF

PRODUCTION

pdf

PCN22_0244_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Jul 12, 2022

- 22_0157

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]

LTC1871HMS#PBF

PRODUCTION

LTC1871HMS#TRPBF

PRODUCTION

pdf

PCN22_0157_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Detailed Parts List

Jun 21, 2022

- 22_0050

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

LTC1871HMS#PBF

PRODUCTION

LTC1871HMS#TRPBF

PRODUCTION

pdf

PCN22_0050_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Aug 16, 2021

- 20_0040

Discontinuation of Lead Finished Parts for MSOP Package.

LTC1871EMS#TR

pdf

PDN20_0040_Form

xls

Material_Report

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DC414B

LTC1871EMS | Boost Controller, 3V ≤ VIN ≤ 5V, VOUT = 5V @ 7A

LTC1871EMS | Boost Controller, 3V ≤ VIN ≤ 5V, VOUT = 5V @ 7A

Download

DC414B

LTC1871EMS | Boost Controller, 3V ≤ VIN ≤ 5V, VOUT = 5V @ 7A

Buy Now View Details

Product Detail

Demonstration circuit DC414 is a step-up (Boost) DC-DC converter featuring the LTC1871 controller. The circuit is capable of providing an output voltage of 5V at 7A (10A peak) from an input supply of 3.3V. External frequency synchronization is provided, as are two modes of operation at light load conditions: Burst mode™ operation to reduce switching losses and maintain high operating efficiency, and continuous mode to provide constant operating frequency with low quiescent current. The LTC1871 is a No R_SENSE^™ current mode step-up controller. It eliminates the need for a current sense resistor and maximizes the efficiency of the demo circuit —up to 95%. The LTC1871 can operate up to a frequency of 1MHz, allowing for the use of small inductors and capacitors. The low shutdown quiescent current of 10μA makes the LTC1871 ideally suited for battery-operated systems. Applications include telecom power supplies, cellular phones, PDAs and portable electronic equipment.

Resources

ZIP

DC414B - Design Files

596.00K

PDF

DC414B - Demo Manual

63.00K

PDF

DC414B - Schematic

28.00K

DC415A

LTC1871EMS | High Efficiency SEPIC Converter, 5V-15V Input, 12VOUT @ 2Amp

DC415A

LTC1871EMS | High Efficiency SEPIC Converter, 5V-15V Input, 12VOUT @ 2Amp

Buy Now View Details

Product Detail

Demonstration circuit 415 is a SEPIC (step-up or step-down) DC/DC converter featuring the LTC1871 controller. The circuit is capable of providing an output voltage of 12V at 2A from an input voltage of 5V to 15V. External frequency synchronization is provided, as are two modes of operation at light load conditions: Burst Mode^® operation reduces switching losses and maintains high efficiency operation; and continuous mode which provides constant operating frequency with low quiescent current.

Resources

PDF

DC415A - Demo Manual

88.00K

PDF

DC415A - Schematic

70.00K

ZIP

DC415A - Design File

583.00K

DC414B

LTC1871EMS | Boost Controller, 3V ≤ VIN ≤ 5V, VOUT = 5V @ 7A

DC415A

LTC1871EMS | High Efficiency SEPIC Converter, 5V-15V Input, 12VOUT @ 2Amp

LTspice 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.