LTC3621 Datasheet | Linear Technology

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 pensation and Soft-Start n Overtemperature Protection n pact 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 puting 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 mode provides the lowest voltage ripple. The MODE pin can also be used to allow the user to sync the switching frequency to an external clock. LTC3621 Options PART NAME LTC3621 LTC3621-3.3 LTC3621-5 LTC3621-2 LTC3621-23.3 LTC3621-25 FREQUENCY 1.00MHz 1.00MHz 1.00MHz 2.25MHz 2.25MHz 2.25MHz VOUT Adjustable 3.3V 5V Adjustable 3.3V 5V L, LT, LTC, LTM, Burst Mode, Linear Technology, the Linear logo and LTSpice are registered trademarks and Hot Swap and LTpower CAD are trademarks of Linear...