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: I_Q = 10µA
• Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor
• Synchronizable to an External Clock Up to 1.3 × f_OSC
• User-Controlled Pulse Skip or Burst Mode® Operation
• Output Overvoltage Protection
• Can be Used in a No R_SENSE^TM Mode for V_DS < 36V
• Small 10-Lead MSOP Package

Typical Application

Description

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.