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LTC1871-7 - High Input Voltage, Current Mode Boost, Flyback and SEPIC Controller

The LTC1871-7 is a current mode, boost, flyback and SEPIC controller optimized for driving 6V-rated MOSFETs in high voltage applications. The LTC1871-7 works equally well in low or high power applications and requires few components to provide a complete power supply solution. The switching 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 6V and a low shutdown quiescent current of 10µA make the LTC1871-7 well suited for battery-operated systems. For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/SYNC pin. The LTC1871-7 is available in the 10-lead MSOP package.

Features Optimized for High Input Voltage Applications Wide Chip Supply Voltage Range: 6V to 36V Internal 7V Low Dropout Voltage Regulator Optimized for 6V-Rated MOSFETs 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 Output Overvoltage Protection Can be Used in a No RSENSETM Mode for VDS < 36V Small 10-Lead MSOP Package Typical Application

Applications Telecom Power Supplies 42V Automotive Systems 24V Industrial Controls IP Phone Power Supplies Packaging

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