LTC1871-7

` 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 = 10A
` 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<sup>®</sup> Operation
` Output Overvoltage Protection
` Can be Used in a No R<sub>SENSE</sub><sup>TM</sup> Mode for V<sub>DS</sub> < 36V
` Small 10-Lead MSOP Package

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

V_IN Voltage ................................................... 0.3V to 36V
INTV_CC Voltage .............................................. 0.3V to 9V
INTV_CC Output Current .............................................. 50mA
GATE Voltage ............................... 0.3V to V_INTVCC + 0.3V
I_TH, FB Voltages .......................................... 0.3V to 2.7V
RUN Voltage ................................................... 0.3V to 7V
MODE/SYNC Voltage .........................................0.3V to 9V
FREQ Voltage .................................................0.3V to 1.5V
SENSE Pin Voltage ......................................... 0.3V to 36V
Operating Temperature Range (Note 2) .. 40°C to 85°C
Junction Temperature (Note 3) ................................ 125°C
Storage Temperature Range ................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................... 300°C

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. Burst Mode operation at light loads, a low minimum operating supply voltage of 6V and a low shutdown quiescent current of 10A 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.