Features

• Dual Step-Down Outputs: 1A Per Channel
• Wide V_IN Range: 2.7V to 17V
• Wide V_OUT Range: 0.6V to V_IN
• Up to 95% Efficiency
• No-Load I_Q = 5μA with Both Channels Enabled; I_Q < 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) and 16-Lead MSOP Packages

Typical Application

Description

The LTC®3622 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.

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 V_OUT options are available to eliminate the external feedback resistors.