LT2940IDD#PBF

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The LT2940IDD#PBF is a high efficiency, monolithically integrated switching regulator specifically designed to provide dual regulation. It utilizes a built-in step-down switching regulator and an LDO regulator to utilize the same controller IC, hence making it easier and more efficient to use. This device is ideal applications such as battery-powered products, portable power tools, and portable medical applications which require both a step-down and LDO regulator.

The LT2940IDD#PBF employs switching topologies in its step-down regulator, allowing for increased efficiency at high load currents and converter output currents above 50mA. It can be used as a single output regulator or as a dual regulator, with each output independently controlled. With the dual outputs, it can be used with Hybrid Battery Chargers or multi-chemistry battery banking systems. It also integrates a selectable current limit into the IC for extra protection.

The LT2940IDD#PBF offers high efficiency at the the output of its step-down regulator, up to 95% in fixed frequency mode, and up to 98% in hysteretic mode. Its LDO regulator also provides high efficiency, up to 90%. Its wide input supply rangefrom 4.5V to 18V also allows it to be used in a variety of applications.

The LT2940IDD#PBF supports both fixed frequency and hysteretic modes of operation. In fixed frequency mode, the switching frequency is synchronous and programmable, offering a wide range of coefficients between 200kHz and 2.5MHz. This option is ideal for high current and high power applications, as the frequency can be adjusted for optimal efficiency at each load current.

Inhysteretic mode, the switching frequency is not programmable and is tightly controlled based on load conditions. This eliminates external frequency compensation and allows for optimized efficiency at light loads. Both modes feature independent control for dual output applications.

The LT2940IDD#PBF integrates a wide range of protection and diagnostic features, including both Overtemperature Protection (OTP) and Overcurrent Protection (OCP). This device supports a robust thermal control, allowing for higher current levels and better efficiency, while still supporting a wide temperature range. The OCP will reduce the output current as needed, while the OTP will shut down the output if a fault is detected.

The LT2940IDD#PBF is also equipped with a low noise mode to reduce emitted EMI, as well as a wide range of adjustable on-time, enabling the user to tailor the performance to the desired application needs. Additionally, the LT2940IDD#PBF also offers an adjustable soft start, allowing a controlled start-up and eliminating inrush current.

The LT2940IDD#PBF is an ideal candidate for a wide range of applications, from high power portable prosumer products to lighting applications, such as LED drivers and street lamps. Its compact design, high efficiency, and robust protection features make it a great choice for applications requiring both a step-down and LDO regulator.

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