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 fewcomponents 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 10uA 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.
FERTURES
■Optimized for High Input Voltage Applications
■Wide Chip Supply Volitage 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: lo=10uA
■Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor
■Synchronizable to an External Clock Up to 1.3x fosc■User-Controlled Pulse Skip or Burst Mode? Operation Output Overvoltage Protection
■ Can be Used in a No RSENSETM Mode for Vos<36V
■Small 10-Lead MSOP Package
Feature
- High Efficiency (No Sense Resistor Required)
- Wide Input Voltage Range: 2.5V to 36V
- 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
- Internal 5.2V Low Dropout Voltage Regulator
- Output Overvoltage Protection
- Capable of Operating with a Sense Resistor for High Output Voltage Applications
- Small 10-Lead MSOP Package
Applications
- Telecom Power Supplies
- Portable Electronic Equipment
(Picture: Pinout)
