LTC1871

PRODUCTION

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

Part Models: 7
1ku List Price: Starting From $3.19

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Part Details

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

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

Part Models: 7
1ku List Price: Starting From $3.19

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

Part Models	Product Lifecycle	PCN

Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LTC1871EMS#PBF	PRODUCTION
LTC1871EMS#TR
LTC1871EMS#TRPBF	PRODUCTION
LTC1871HMS#PBF	PRODUCTION
LTC1871HMS#TRPBF	PRODUCTION
LTC1871IMS#PBF	PRODUCTION
LTC1871IMS#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1871EMS#TR
LTC1871HMS#PBF	PRODUCTION
LTC1871HMS#TRPBF	PRODUCTION
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]
		PCN22_0157_Form Material_Report Qualification Results Summary Delta Qualification Matrix Detailed Parts List
LTC1871HMS#PBF	PRODUCTION
LTC1871HMS#TRPBF	PRODUCTION
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1871HMS#PBF	PRODUCTION
LTC1871HMS#TRPBF	PRODUCTION
Aug 16, 2021 - 20_0040 Discontinuation of Lead Finished Parts for MSOP Package.
		PDN20_0040_Form Material_Report
LTC1871EMS#TR		PDN20_0040_Form Material_Report

Hardware Ecosystem

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LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC1871
LTC1871-1
LTC1871-7

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.

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Part Details

Documentation

Reliability Data 1

Design Note 3

Technical Articles 2

Hardware Ecosystem

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

Latest Discussions

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