LTC3890EUH#PBF

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LTC3890EUH#PBF is a high performance dual synchronous DC/DC controller with integrated MOSFET drivers designed for point-of-load applications from 2.5V to 16V inputs. LTC3890EUH#PBF is designed specifically to reduce component count and cost by integrating the FET drivers and output clamps into the controller IC. The integrated MOSFET drivers operate over a wide supply range (2.7V to 16V) and deliver up to 10A (RMS) peak current drive. This high peak drive current is necessary for switching loss reduction and maximum efficiency in step-down applications.

The LTC3890EUH#PBF features a wide input voltage range, up to 9V VREF, adjustable soft-start, dynamic voltage scaling, cycle-by-cycle current limit and constant on-time control. Run, cycle-hole and tracking mode options allow for superior load transient performance. The device includes internal MOSFET drivers with a peak current rating of 10A (RMS) and is offered in a thermally enhanced 28-lead (4mm x 4mm) QFN package.

The LTC3890EUH#PBF can be used in many applications including power management for computing systems, automotive equipment and industrial devices. It can operate as a POL (point-of-load) regulator and can be used to design a power delivery system for a variety of applications such as servers, storage systems, networking devices, etc. It can also be used to design DC-DC converters for automotive and industrial applications as well as for renewable energy systems such as solar charge controllers.

Working Principle

The LTC3890EUH#PBF operates in one of two different modes: constant on-time or synchronous buck mode. In constant on-time operation the device operates at a constant switching frequency and the duty cycle is adjusted as needed to maintain output regulation. This mode offers improved light load efficiency compared to other controllers, as there is no minimum off-time. In synchronous buck mode, the internal synchronous PWM provides an adjustable frequency and duty cycle, allowing the user to select the desired output voltage and speed. In both modes the current loop regulates the output current and provides cycle-by-cycle current limit. The device also has the ability to operate in run, cycle-hole, and tracking modes to provide superior load transient performance.

The integrated MOSFET drivers operate over a wide supply range (2.7V to 16V) and deliver up to 10A (RMS) peak current drive. The drivers achieve a maximum current charge of 22uC for increased efficiency, reduced EMI and faster switching times. The drivers feature bursts of cycle-by-cycle current limit, allowing for greater current density and faster dynamic response. The device also features adjustable soft-start and dynamic voltage scaling, providing the user with maximum flexibility.

Conclusion

The LTC3890EUH#PBF is an advanced dual synchronous DC/DC controller with integrated MOSFET drivers. It can be used in a variety of applications ranging from servers and storage systems to automotive and industrial applications. With its wide input voltage range, adjustable soft-start and dynamic voltage scaling, the device is ideal for point-of-load applications from 2.5V to 16V inputs. The integrated MOSFET drivers also provide up to 10A (RMS) peak current drive with 22uC maximum charge, allowing for increased efficiency and reduced EMI. With its ability to operate in constant on-time or synchronous buck mode, the LTC3890EUH#PBF is an ideal solution for many power management applications.

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