LTC3853IUJ#PBF

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The LTC3853IUJ#PBF is an integrated synchronous step-down switch-mode DC/DC controller. It has a wide input voltage range to convert an input voltage of 2.25V to 38V down to regulated output voltages. It features a wide range of options to improve system performance, maximize battery life and simplify design.

This device operates with a current-mode architecture, allowing for fast transient response times and excellent control loop performance. Its wide frequency range (100kHz to 2MHz) also means that designs can get the most out of output inductors. Additionally, this device supports true differential current-sensing for increased loop stability, improved transient response and better accuracy. Furthermore, the LTC3853IUJ#PBF enables soft-start and flexible external compensation and input voltage monitoring.

The LTC3853IUJ#PBF is ideal for applications in space-constrained industrial, automotive, PCB and portable applications, such as medical and harsh industrial fan applications, where noise is critical. It has a wide operating temperature range of -40C to 85C and provides high-efficient switch-mode power conversion.

The LTC3853IUJ#PBF works by controlling two external NMOS power switches. One switch is the high side and the other is the low side. These switches modulate the switch on-time and the switch off-time of their corresponding switch to output a constant voltage at the output. This voltage can be programmed using an external voltage setting resistors. The LTC3853IUJ#PBF inherently includes a current sensing, current limiting, thermal limiting and current optimization circuits that help to maximize efficiency and optimize the performance of the output voltage. The device also includes a differential-mode input that is used for optimizing the input supply noise reduction, providing a cleaner output voltage.

The device is designed to be used in a standard two-phase, two-switch synchronous buck converter. In order to optimize the output voltage performance, the device provides an auto-skip feature, which spreads the current load across the two phases and provides efficient delivery of the output current.

The LTC3853IUJ#PBF includes several additional features that help to maximize system performance and increase the available options. These include an adjustable output voltage down to 0.6V, adjustable output current limit, thermal shutdown, UVLO, current limiting and output voltage tracking, as well as enable/disable switching for both high-side and low-side switches.

Overall, the LTC3853IUJ#PBF is an ideal device for space-constrained applications that require a compact, high-efficiency, synchronous step-down switch-mode DC-DC converter. It provides excellent transient response, a wide range of options to optimize system performance, and operates over a wide temperature range to accommodate even the most demanding industrial applications.

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