Analog Devices LTC3622

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 ultralowquiescent 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 allowthe 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 ExternalFrequency Synchronization
• ±1% Output Voltage Accuracy
• Current Mode Operation for Excellent Line and LoadTransient Response
• Phase Shift Programmable with External Clock
• Selectable Current Limit
• Internal Compensation and Soft-Start
• Compact 14-Pin DFN (3mm × 4mm) Package

Typical applications

• Point-of-Load Supplies
• Portable – Handheld Scanners
• Battery Powered Systems

More information

• Datasheet
• IC product information