LTC3621

RECOMMENDED FOR NEW DESIGNS

17V, 1A Synchronous Step-Down Regulator with 3.5μA Quiescent Current

Analog Devices LTC3621 Product Info

10 February 2026 5

Features

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

Part details & applications

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.

LTC3621 Options
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