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. 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 * 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: IQ = 10μA * Programmable Operating Frequency (65kHz to 900kHz) with One External Resistor https://elecena.pl/product/7560964/wide-input-range-no-r-current-mode-boost-flyback-and-sepic-controller 2017-02-02 https://elecena.pl/product/7560964/wide-input-range-no-r-current-mode-boost-flyback-and-sepic-controller 2017-02-04 https://elecena.pl/product/7560964/wide-input-range-no-r-current-mode-boost-flyback-and-sepic-controller 2025-01-19