LTC1871 Series

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

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

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

Part	Package / Case	Output Configuration	Number of Outputs	Duty Cycle (Max) [Max]	Operating Temperature [Max]	Operating Temperature [Min]	Frequency - Switching [Min]	Frequency - Switching [Max]	Topology	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Mounting Type	Function	Output Type	Supplier Device Package	Output Phases	Control Features
Analog Devices Inc./Maxim Integrated LTC1871EMS#PBF	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive or Negative	1	92 %	85 C	-40 ¯C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	2.5 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control
Analog Devices Inc./Maxim Integrated LTC1871HMS#TRPBF	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive or Negative	1	92 %	150 °C	-40 °C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	2.5 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control
Analog Devices Inc./Maxim Integrated LTC1871EMS#TR	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive or Negative	1	92 %	85 C	-40 ¯C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	2.5 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control
Analog Devices Inc./Maxim Integrated LTC1871IMS#TRPBF	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive or Negative	1	92 %	125 °C	-40 C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	2.5 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control
Analog Devices Inc./Maxim Integrated LTC1871HMS	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive or Negative	1	92 %	150 °C	-40 C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	2.5 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control
Analog Devices Inc./Maxim Integrated LTC1871IMS-7	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive	1	92 %	125 °C	-40 C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	6 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control
Analog Devices Inc./Maxim Integrated LTC1871HMS#PBF	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive or Negative	1	92 %	150 °C	-40 °C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	2.5 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control
Analog Devices Inc./Maxim Integrated LTC1871EMS-7#TRPBF	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive	1	92 %	85 C	-40 ¯C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	6 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control
Analog Devices Inc./Maxim Integrated LTC1871IMS#PBF	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive or Negative	1	92 %	125 °C	-40 C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	2.5 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control
Analog Devices Inc./Maxim Integrated LTC1871EMS-1#TRPBF	10-TFSOP 10-MSOP (0.118" 3.00mm Width)	Positive or Negative	1	92 %	85 C	-40 ¯C	50 kHz	1 MHz	Boost Flyback SEPIC	36 V	2.5 V	Surface Mount	Step-Up Step-Up/Step-Down	Transistor Driver	10-MSOP	1	Enable Frequency Control

Description

The LTC1871-1 is a wide input range, current mode, boost, flyback or SEPIC controller that drives an Nchannel power MOSFET and requires very few external components. It eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maximizing efficiency. Higher output voltage applications are possible with the LTC1871-1 by connecting the SENSE pin to a resistor in the source of the power MOSFET.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.The LTC1871-1 differs from the LTC1871 by having a lower pulse skip threshold, making it ideal for applications requiring constant frequency operation at light loads. The lower pulse skip threshold also helps maintain constant frequency operation in applications with a wide input voltage range. For applications requiring primary-to-secondary side isolation, please refer to the LTC1871 datasheet.The LTC1871-1 is available in the 10-lead MSOP package.Vin RangeINTVccFeaturesLTC18712.5V to 36V5.2V-LTC1871-12.5V to 36V5.2VLower Burst Mode Threshold (0.195V vs. 0.3V)LTC1871-76V to 36V7VDrives 6V Gate N-Channel MOSFETsLTC1871X2.5V to 36V5.2V175°C Junction Temp, 100% Tested at 175°CApplicationsTelecom Power SuppliesPortable Electronic Equipment