LTC3608 Datasheet | Linear Technology

Features n 8A Output Current n Wide VIN Range = 4V to 18V n Internal N-Channel MOSFETs n True Current Mode Control n Optimized for High Step-Down Ratios n t ON(MIN) ≤ 100nsec n Extremely Fast Transient Response n Stable with Ceramic COUT n ±1% 0.6V Voltage Reference n Power Good Output Voltage Monitor n Adjustable On-Time/Switching Frequency n Adjustable Current Limit n Programmable Soft-Start n Output Overvoltage Protection n Optional Short-Circuit Shutdown Timer n Low Shutdown IQ: 15µA n Available in a 7mm × 8mm 52-Lead QFN Package Applications n Point of Load Regulation n Distributed Power Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6100678, 6580258, 5847554, 6304066. 18V, 8A Monolithic Synchronous Step-Down DC/DC Converter Description The LTC®3608 is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 8A output current from a 4V to 18V (20V maximum) input supply. It uses a valley current control architecture to deliver very low duty cycle operation at high frequency with excellent transient response. The operating frequency is selected by an external resistor and is pensated for variations in VIN and VOUT. The LTC3608 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads. Fault protection is provided by internal foldback current limiting, an output overvoltage parator and an optional short-circuit shutdown timer. Soft-start capability for supply sequencing is acplished using an external timing capacitor. The regulator current limit is user programmable. A power good output voltage monitor indicates when the output is in regulation. The...