LTC3851AEMSE#PBF

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LTC3851AEMSE#PBF is a pulse-width modulated (PWM) current mode DC/DC switching controller designed for use in high-performance applications. It has been designed for flexibility and offers many features to reduce your design time. It is a versatile controller that can be used to control either buck or boost DC/DC converters. The LTC3851AEMSE#PBF provides a number of safety and protection features such as undervoltage lockout and overvoltage protection. It is available in a small 8-pin PowerPAD™ surface-mount package.

Overview

The LTC3851AEMSE#PBF is a synchronous, single-channel PWM current mode switching regulator which features a wide input voltage range, high efficiency, and a push-pull gate driver. This device is ideal for point-of-load (POL) applications as well as light industrial applications such as motor drive systems and parallel regulated power supplies. It is capable of providing circuit designers with flexibility when creating solutions for a wide variety of high current applications. It is fully compatible with the popular LTC3851 family of parts and offers several improvements such as an increased operating temperature range, improved transient response, higher efficiency ratings, and a configurable internal current limit.

Application fields

The LTC3851AEMSE#PBF is suited for a wide range of applications such as server drive systems, redundant power supplies, on-card regulated supplies, and bootstrap supplies. It is also suitable for use in distributed power systems, point-of-load converters, low profile power supplies, and telecom power supplies. It offers a high level of flexibility and can be used to regulate either a buck converter or an adjustable output converter. Its current mode control provides fast line and load transient response. Its high efficiency and low quiescent current make it ideal for applications with high efficiency requirements.

Working principle

The LTC3851AEMSE#PBF is a single-channel switching regulator controller based on a current mode control topology. It utilizes a high-performance current mode regulating technique that exhibits fast transients and wide dynamic ranges of control, making the controller ideal for use in high-performance applications. When operating in the buck configuration, the internal error amplifier senses the output voltage and generates an error signal that is sent to the PWM comparator where it is compared with an adjustable current reference, which is typically set at 60 to 65% of the equivalent DC output current. The PWM comparator then switches the MOSFET on and off to regulate the output voltage. When operating in the boost configuration, the controller senses the output voltage and, when it exceeds the setpoint, turns off the power switch to limit the voltage. The controller also has a programmable soft-start to prevent excessive inrush currents.

Conclusion

The LTC3851AEMSE#PBF is a high-performance, pulse-width modulated (PWM) current-mode DC/DC switching controller designed for use in high-performance applications. It offers flexibility, safety, and protection features, and the device can be used to control either a buck or boost converter with high efficiency, good transient response, and a wide range of adjustable current and voltage settings. This makes it ideal for a wide range of higher current applications, including servers and telecom power supplies, as well as low profile power supplies, distributed power systems, and parallel regulated supplies.

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