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17V, Dual 1A Synchronous Step-Down Regulator with Ultralow Quiescent Current
Published: Jul 25,2014853 Read
The LTC3622 is a dual 1A output, high efficiency synchronous monolithic step-down regulator capable of operating from input supplies up to 17V. The switching frequency is fixed to 1MHz or 2.25MHz with a ±50% synchronization range to an external clock. The regulator features ultralow quiescent current and high efficiency over a wide output voltage range.
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The step-down regulators operate from an input voltage range of 2.7V to 17V and provide an adjustable output 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 ripple noise. The switching regulators can be synchronized to an external clock. Furthermore, fixed VOUT options are available to eliminate the external feedback resistors.
Features:
－ Dual Step-Down Outputs: 1A Per Channel
－ Wide VIN Range: 2.7V to 17V
－ Wide VOUT Range: 0.6V to VIN
－ Up to 95% Efficiency
－ No-Load IQ = 5μA with Both Channels Enabled; IQ < 4μA with Only One Channel Enabled
－ High Efficiency, Low Dropout Operation (100% Duty Cycle)
－ Constant Frequency (1MHz/2.25MHz) with External Frequency Synchronization
－ ±1% Output Voltage Accuracy
－ Current Mode Operation for Excellent Line and Load Transient Response
－ Phase Shift Programmable with External Clock
－ Selectable Current Limit
－ Internal Compensation and Soft-Start
－ Compact 14-Pin DFN (3mm × 4mm) Package
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