LTC3803IS6#TRPBF

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The LTC3803IS6#TRPBF is a synchronous, current mode PWM DC-DC controller that is used for isolated and non-isolated power supplies. This device replaces linear controllers in DC/DC power supply designs and provides higher efficiency, reduced thermal stress and offers an ultra-low quiescent current. It can be configured as a single, dual or multi-phase controller with specified ratios of output voltage or current. This feature enables the use of a single device to control multiple independent power supplies. The device offers fast transient response, small form factor and is ideal for power supply designs with space limitations.

Application Field

The LTC3803IS6#TRPBF is a high-performance synchronous buck DC/DC controller used to support isolated and non-isolated DC/DC power supplies in a variety of applications. Its ability to accurately regulate outputs, fast transient response, and small form factor make it an ideal choice for power supplies in various portable systems, including notebook computers, cellular phones, and digital cameras. It can also be used in automotive, medical, and industrial applications where fast transient response, low-noise operation, and tight regulation are essential.

Working principle

The LTC3803IS6#TRPBF DC/DC controller operates in a synchronous buck topology, in which an external MOSFET switches power between the input and the output. During each switching period, the MOSFET is first switched on to charge the output capacitor, then is switched off, so that the output capacitor discharges the current to the load. As the input voltage varies, the controller changes its on time to maintain a constant output while providing high efficiency. Closed loop control is also provided with an external feedback resistor and a programmable reference voltage. Fast transient response is also provided with current slope limiting and feed forward control.

The device includes an internal sleep mode which automatically reduces the quiescent current to 0.7µA when the output is not required, thereby increasing the efficiency and the efficiency of the overall system. A fault and power detect circuit is also available which monitors the power and the output conditions to alert the system when a fault is detected. This feature provides safeguards to protect the system from experiencing thermal or electrical over-stress.

The LTC3803IS6#TRPBF is a highly integrated and configurable synchronous, current-mode DC/DC controller designed to offer high efficiency, low noise operation, and fast transient response. With its flexible and configurable features, it is an ideal solution for designs that require fast transient response, high efficiency, and a small form factor.

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