LTC3621 Datasheet

• Wide V_IN Range: 2.7V to 17V
• Wide V_OUT Range: 0.6V to V_IN
• 95% Max Efficiency
• Low I_Q < 3.5μA, Zero-Current Shutdown
• Constant Frequency (1MHz/2.25MHz)
• Full Dropout Operation with Low I_Q
• 1A Rated Output Current
• ±1% Output Voltage Accuracy
• Current Mode Operation for Excellent Line and Load Transient Response
• Synchronizable to External Clock
• Pulse-Skipping, Forced Continuous, Burst Mode^® Operation
• Internal Compensation and Soft-Start
• Overtemperature Protection
• Compact 6-Lead DFN (2mm × 3mm) Package or Thermally-Enhanced MS8E Package with Power Good Output and Independent SGND Pin
• AEC-Q100 Qualified for Automotive Applications

• Portable-Handheld Scanners
• Industrial and Embedded Computing
• Automotive Applications
• Emergency Radio

The LTC3621/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 V_OUT 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 V_IN 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.