LTC1625CGN#PBF

LTC®1625 is a synchronous step-down switching regulator controller that drives external N-Channel power MOSFETs using few external components. Current mode control with MOSFET VDS sensing eliminates the need for a sense resistor and improves efficiency. The frequency of a nominal 150KHz internal oscillator can be synchronized to an external clock over a 1.5:1 frequency range. Burst Mode™ operation at low load currents reduces switching losses and low dropout operation extends operating time in battery-powered systems. A forced continuous mode control pin can assist secondary winding regulation by disabling burst mode operation when the main output is lightly loaded. Fault protection is provided by foldback current limiting and an output overvoltage comparator. Typical applications are notebook and palmtop computers, PDAs, cellular telephones and wireless modems, battery chargers, distributed power.

• Highest efficiency current mode controller, no sense resistor required
• Stable high current operation, dual N-channel MOSFET synchronous drive
• ±1% 1.19V reference, programmable fixed frequency with injection lock
• Very low drop out operation: 99% duty cycle, forced continuous mode control pin
• Pin selectable output voltage, foldback current limit, output overvoltage protection
• Logic controlled micropower shutdown: IQ <lt/> 30µA
• Feedback current is 50nA max (VPROG pin open, ITH=1.19V)
• Input DC supply current is 500µA (normal mode)
• 16-lead plastic SSOP package
• Operating ambient temperature range from 0°C to 70°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party