LT3575IFE#TRPBF

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LT3575IFE#TRPBF, manufactured by Linear Technology, is a high-efficiency synchronous buck regulators with integrated FETs. Its output capability ranges up to 5A. Applications of LT3575IFE#TRPBF includes tablet, smart phone, wireless base station, servers, appliances, and other powe electronics products.

LT3575IFE#TRPBF consists of a high side power switch and a low side power switch as well as a voltage reference. It can reach low output voltages down to 0.6V with high efficiency. Integrated output disconnect, undervoltage lockout and short circuit protection ensure safe operation. It also features an adjustable current limit that allows external resistor to set the current limit for the device. Additionally, its soft start scheme can prevent output overshoot to avoid possible damages from large in-rush current.

Working principle of LT3575IFE#TRPBF is straightforward. When an external voltage is supplied, the Buck operation will be started when enabled. An internal oscillator sets the switching frequency and duty cycle that keep the output voltage at the output voltage setting. The minimum on-time of the device will be adjusted to maintain the output voltage at the set value. In this way, even if the input voltage is varying or the load current is changing, the output voltage will still be regulated.

When the function of LT3575IFE#TRPBF is enabled and disabled, the output of the device is disconnected by the output control duty. During the disabled status, the output voltage will be frozen at the voltage before the shutoff. The device also employs an active low shutdown control that is used to shutdown the output. This feature is mainly used to conserve power.

In terms of over current protection, the device also adopts an adjustable current sense solution. The current sense threshold is programed by an external resistor, and the internal set point is set to one fourth of the total output current. Whenever this threshold value is exceeded, the output control duty will be disabled, which will shuttingdef down the output and prevents the device from current overload.

In conclusion, LT3575IFE#TRPBF is a switch-mode power regulator concept that can be used in a wide range of power conversion applications such as LED drivers, battery charging and portable electronic devices. It provides high efficiency, flexibility and protection. Moreover, the adjustable current sense circuit can offer the system a reliable over current protection.

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