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LTC3122 - 15V, 2.5A Synchronous Step-Up DC/DC Converter with Output Disconnect

The LTC®3122 is a synchronous step-up DC/DC converter with true output disconnect and inrush current limiting. The 2.5A current limit along with the ability to program output voltages up to 15V makes the LTC3122 well suited for a variety of demanding applications. Once started, operation will continue with inputs down to 500mV, extending runtime in many applications.

The LTC3122 features output disconnect in shutdown, dramatically reducing input power drain and enabling VOUT to completely discharge. Adjustable PWM switching from 100kHz to 3MHz optimizes applications for highest efficiency or smallest solution footprint. The oscillator can also be synchronized to an external clock for noise sensitive applications. Selectable Burst Mode operation reduces quiescent current to 25μA, ensuring high efficiency across the entire load range. An internal soft-start limits inrush current during start-up.

Other features include a <1μA shutdown current and robust protection under short-circuit, thermal overload, and output overvoltage conditions. The LTC3122 is offered in both a low profile 12-lead (3mm × 4mm × 0.75 mm) DFN package and a 12-lead thermally enhanced MSOP package.

Features VIN Range: 1.8V to 5.5V, 500mV After Start-Up Output Voltage Range: 2.2V to 15V 800mA Output Current for VIN = 5V and VOUT = 12V Output Disconnects from Input When Shut Down Synchronous Rectification: Up to 95% Efficiency Inrush Current Limit Up to 3MHz Adjustable Switching Frequency Synchronizable to External Clock Selectable Burst Mode® Operation: 25μA IQ Output Overvoltage Protection Soft-Start <1μA IQ in Shutdown 12-Lead, 3mm × 4mm × 0.75mm Thermally Enhanced DFN and MSOP Packages Typical Application

Applications RF Power Piezo Actuators Small DC Motors 12V Analog Rail From Battery, 5V, or Backup Capacitor Packaging

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