LTC1871 - Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller


  • 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: IQ = 10μA
  • Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor
  • Synchronizable to an External Clock Up to 1.3 × fOSC
  • 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

Typical Application

LTC1871 Typical Application
LTC1871 Typical Application


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


For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC1871EMS MS-10 MS E 05-08-1661 RoHS
LTC1871EMS#PBF MS-10 MS E 05-08-1661 RoHS
LTC1871EMS#TR MS-10 MS E 05-08-1661 RoHS
LTC1871EMS#TRPBF MS-10 MS E 05-08-1661 RoHS
LTC1871HMS MS-10 MS H 05-08-1661 RoHS
LTC1871HMS#PBF MS-10 MS H 05-08-1661 RoHS
LTC1871HMS#TRPBF MS-10 MS H 05-08-1661 RoHS
LTC1871IMS MS-10 MS I 05-08-1661 RoHS
LTC1871IMS#PBF MS-10 MS I 05-08-1661 RoHS
LTC1871IMS#TR MS-10 MS I 05-08-1661 RoHS
LTC1871IMS#TRPBF MS-10 MS I 05-08-1661 RoHS

LTC1871 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC1871EMS MS-10 E $6.28 $5.30 No
LTC1871EMS#PBF MS-10 E $3.14 $2.65 Yes
LTC1871EMS#TR MS-10 E $5.42 No
LTC1871EMS#TRPBF MS-10 E $2.71 Yes
LTC1871HMS MS-10 H $9.66 $6.76 No
LTC1871HMS#PBF MS-10 H $4.83 $3.38 Yes
LTC1871HMS#TRPBF MS-10 H $3.44 Yes
LTC1871IMS MS-10 I $8.76 $6.10 No
LTC1871IMS#PBF MS-10 I $4.38 $3.05 Yes
LTC1871IMS#TR MS-10 I $6.22 No
LTC1871IMS#TRPBF MS-10 I $3.11 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC414B LTC1871EMS | Boost Controller, 3V ≤ VIN ≤ 5V, Vout = 5V @ 7A $125.00
DC415A LTC1871EMS | High Efficiency SEPIC Converter, 5V-15V Input, 12Vout @ 2Amp $125.00
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