LTC3621-2

Features n Wide VIN Range: 2.7V to 17V n Wide VOUT Range: 0.6V to VIN n 95% Max Efficiency n Low IQ < 3.5µA, Zero-Current Shutdown n Constant Frequency (1MHz/2.25MHz) n Full Dropout Operation with Low IQ n 1A Rated Output Current n ±1% Output Voltage Accuracy n Current Mode Operation for Excellent Line and Load Transient Response n Synchronizable to External Clock n Pulse-Skipping, Forced Continuous, Burst Mode® Operation n Internal Compensation and Soft-Start n Overtemperature Protection n Compact 6-Lead DFN (2mm × 3mm) Package or Thermally-Enhanced MS8E Package with Power Good Output and Independent SGND Pin Applications n Portable-Handheld Scanners n Industrial and Embedded Computing n Automotive Applications n Emergency Radio LTC3621/LTC3621-2 17V, 1A Synchronous Step-Down Regulator with 3.5µA Quiescent Current Description The LTC®3621/LTC3621-2 is a high efficiency 17V, 1A synchronous monolithic step-down regulator. The switching frequency is fixed to 1MHz or 2.25MHz with a ±40% synchronizing range. The regulator features ultralow quiescent current and high efficiencies over a wide VOUT range. The step-down regulator operates from an input voltage range of 2.7V to 17V and provides an adjustable output range from 0.6V to VIN while delivering up to 1A of output current. A user-selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency; Burst Mode operation provides the highest efficiency at light loads, while pulse-skipping ...