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 RSENSE™ Mode for VDS < 36V
Small 10-Lead MSOP Package
LTC1871-7 Applications
Telecom Power Supplies
42V Automotive Systems
24V Industrial Controls
IP Phone Power Supplies
LTC1871-7 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.
