LTC1871X

RECOMMENDED FOR NEW DESIGNS

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

Part Models: 2
1ku List Price: Starting From $147.20

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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
±2% Internal Voltage Reference
Micropower Shutdown: I_Q = 10μA
Programmable Operating Frequency (65kHz to 900kHz) 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

LTC1871X is a wide input range, current mode, boost, flyback or SEPIC controller that drives an N-channel power MOSFET. LTC1871X is rated to 175°C junction temperature and is 100% tested at 175°C. 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 65kHz to 900kHz 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 LTC1871X 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 LTC1871X by connecting the SENSE pin to a resistor in the source of the power MOSFET. The LTC1871X is available in the 10-lead MSOP package.


	V_IN Range	INTV_CC	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: 2
1ku List Price: Starting From $147.20

Documentation

Data Sheet 1

LTC1871X: Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller Data Sheet 01/31/2017

Reliability Data 1

R384 Reliability Data 03/26/2018

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
LTC1871XMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1871XMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN
No Match Found
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LTC1871XMS#PBF	PRODUCTION
LTC1871XMS#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

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.

Latest Discussions

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