LTC3727A-1 Datasheet | Linear Technology

Features n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 14V n Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise n OPTI-LOOP® pensation Minimizes COUT n ±1% Output Voltage Accuracy n Power Good Output Voltage Monitor n Phase-Lockable Fixed Frequency 250k Hz to 550k Hz n Dual N-Channel MOSFET Synchronous Drive n Wide VIN Range: 4V to 36V Operation n Very Low Dropout Operation: 99% Duty Cycle n Adjustable Soft-Start Current Ramping n Foldback Output Current Limiting n Output Overvoltage Protection n Low Shutdown IQ: 20μA n Selectable Constant Frequency or Burst Mode® Operation n Small 28-Lead SSOP Package APPLICATIONS n Tele Systems n Automotive Systems n Battery-Operated Digital Devices High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators DESCRIPTION The LTC®3727A-1 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows phase-lockable frequency of up to 550k Hz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase. The LTC3727A-1 is an improved version of the LTC3727 family of parts. It has smaller output ripple while in the drop-out condition and shorter minimum on-time. OPTI-LOOP pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. There is a precision 0.8V reference and a power good output indicator. A wide 4V to 30V (36V maximum) input supply range enpasses all battery chemistries. A RUN/SS pin for each controller provides soft-start. Current foldback limits MOSFET heat dissipation during short-circuit conditions. Output overvoltage protection circuitry protects the controller until VOUT returns to normal. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP are registered trademarks of...