LTC3805MPMSE-5#PBF

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The LTC3805MPMSE-5#PBF is an adjustable, current-mode synchronous-buck DC/DC switching controller that is ideally suited for generating the fixed and adjustable outputs required by modern integrated circuits, including those with DDR memory interfaces. The field-programmable output voltage is created by efficiently alternating the inductor current between two “buck” phases. When the current mode technique is employed, high performance is achievable over a wide range of load and line conditions.

The LTC3805MPMSE-5#PBF is an adjustable, current-mode synchronous-buck DC/DC switching controller that is optimally designed to provide the high efficiency, fast transient response, and performance needed in a wide variety of applications. When operating in current-mode control, the LTC3805MPMSE-5#PBF provides high-speed dynamic current regulation, along with fast response to differing load and line conditions. By providing two power stages, the LTC3805MPMSE-5#PBF can maintain current level accuracy over a wide range of line and load conditions.

The LTC3805MPMSE-5#PBF contains several features for maximum flexibility, including a programmable oscillator frequency (up to 500 kHz) for optimization of system efficiency and transient response; a jitter-free input undervoltage lockout (UVLO) latch; an adjustable soft start time; an adjustable output voltage from 0.6 V to 5 V; an adjustable switching frequency from 10 kHz to 500 kHz; and adjustable output current limit.

The LTC3805MPMSE-5#PBF synchronous buck DC/DC switching controller is available in an 8-pin TSSOP package and provides a very high current level accuracy over the entire line, load and temperature range. It has a wide input voltage range (7 V to 75 V) and is capable of delivering up to 30 W of input power. The controller has many integrated features typically found only in more expensive devices, such as frequency dithering, over-temperature shutdown and thermal overload protection, adjustable output current limit, adjustable output voltage and rise time, adjustable frequency and external soft-start, and synchronous rectification.

The principle of operation of the LTC3805MPMSE-5#PBF is based on a continuous current mode. During operation, when the output is loaded, the synchronous Buck DC/DC switching controller regulates the inductor current to keep it constant relative to a programmed level. The inductor current is then regulated between zero and a maximum or peak current set by the current limit (I_LIMIT) voltage. At any given time, the inductor current is alternating between the phase 1 and phase 2 Buck stages.

In phase 1 of its operation, the current in the inductor builds up and is controlled by the voltage V_COMP. When the voltage reaches a set level, the controller switches to phase 2 and the current becomes negative. In phase 2, the current levels down until it reaches zero and the controller switches back to phase 1. This process is repeated in a cycle, resulting in efficient and precise regulation of the output voltage.

In summary, the LTC3805MPMSE-5#PBF is designed to provide a field programmable and adjustable current-mode synchronous-buck DC/DC switching controller that is ideal for applications requiring high efficiency, fast transient response and load regulation. This part has all the features necessary to meet the most demanding requirements of applications such as high performance DDR memory and CPUs, wireless base station power supplies, and Li-ion battery-powered systems.

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