DESCRIPTION

The LTC® 1871-7 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.

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

APPLICATIONS

■ Telecom Power Supplies

■ 42V Automotive Systems

■ 24V Industrial Controls

■ IP Phone Power Supplies