LTC3803IS6-5#TRMPBF

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The LTC3803IS6-5#TRMPBF is a synchronous buck switching controller with integrated voltage feedback and current sensing that operates over a wide input voltage range and has excellent power conversion efficiency. This makes it ideal for use in portable handheld applications, such as cellular phone battery charging systems, digital cameras, and power supplies.

This controller is optimized for operation with low-loss, low-cost external N-channel MOSFETs. The operating frequency is set with an external timing capacitor and an enabling pin is available for shutdown capability. An adjustable current trip-point circuit provides an output disconnect feature to protect against short-circuit conditions and prevent accidental shorting of the output.

The LTC3803IS6-5#TRMPBF is constructed using a standard, 5-pin, leadless surface mount SOT-23 package to ensure low-profile size and easy assembly. All switch pin connections are brought out to the same side of the package, providing a simpler, more cost-effective solution.

The LTC3803IS6-5#TRMPBF is a monolithic, high-efficiency step-down switching controller that operates with input voltages from 4.5V to 25V and offers a wide range of VOUT, which can be adjusted from 0.6V to VIN or from 0.8V to 15V with an external resistor divider. The device uses a constant frequency, current-mode control architecture with a high-speed loop compensation amplifier for excellent stability. A high-side current sense amplifier ensures accurate current sensing and control, allowing maximum efficiency and excellent line and load transient responses.

The 330kHz switching frequency provides good noise immunity and allows the use of small filters and inductors for low-cost solutions. The device can also be synchronized to an external clock for a wide range of applications. The thermal shutdown and current limit features protect both the device and the power supply against any overload condition.

In battery-powered handheld applications, efficient power conversion is critical. The LTC3803IS6-5#TRMPBF achieves superior efficiency with its adjustable voltage and current control features, while its low Iq maximizes the system’s battery life. Additionally, the device is reverse-current protected and the output soft-start reduces in-rush current during start-up.

The LTC3803IS6-5#TRMPBF is a versatile step-down switching controller that is well suited for numerous applications requiring efficient, low-cost power conversion. Its wide input voltage range and adjustable output voltage and current make it ideal for powering wireless devices, portable medical equipment, and industrial devices.

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