ANALOG DEVICES LTC1628CG#TRPBF DC/DC Controller, Synchronous Buck, 3.5V to 36V Supply, 2 Output, 99.4% Duty Cycle, 310kHz, SSOP-28

LTC®1628 is a high performance dual step-down switching regulator controller that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows adjustment of the frequency up to 300KHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with future microprocessor generations, and a wide input supply range encompasses all battery chemistries. Current foldback limits MOSFET dissipation during short-circuit conditions when overcurrent latch off is disabled. Typical applications are notebook and palmtop computers, PDAs, battery chargers, portable instruments, battery-operated digital devices, DC power distribution systems.

• Out-of-phase controller reduces required input capacitance and power supply induced noise
• OPTI-LOOP® compensation minimizes COUT, ±1% output voltage accuracy
• Dual N-channel MOSFET synchronous drive, very low dropout operation: 99% duty cycle
• Adjustable soft-start current ramping, foldback output current limiting
• Output overvoltage protection, remote output voltage sense
• Selectable constant frequency or Burst Mode® operation
• Regulated feedback voltage range from 0.792 to 0.808V (ITH1, 2 voltage=1.2V, TA=25°C. VIN=15V)
• Feedback current is �50nA
• 28-lead plastic SSOP package
• Operating temperature rating range from 0°C to 85°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