LTC3858EUH - High Performance Dual Step-Down Switching Regulator Controller

The LTC3858EUH is a high-performance dual step-down switching regulator controller that is designed to manage power requirements for a variety of applications. Manufactured by Linear Technology, this advanced controller is housed in a compact 32-lead QFN package, making it suitable for space-constrained designs.

This robust controller operates over a wide input voltage range of 4.5V to 38V, enabling it to handle a broad spectrum of power sources, from single-cell Li-Ion batteries to intermediate bus voltages in complex systems. The LTC3858EUH is capable of producing two independent output voltages ranging from 0.8V to 24V, which can be beneficial for systems requiring multiple supply rails with high efficiency and tight regulation.

Featuring a powerful 1.1Ω on-chip gate drivers, the LTC3858EUH is designed to drive external N-channel MOSFETs at high frequencies up to 750kHz per phase, allowing for smaller inductor and capacitor sizes, which results in a more compact power supply design. The device also offers a phase-lockable frequency of up to 850kHz, providing flexibility in component selection and optimization of the power supply layout.

One of the key features of the LTC3858EUH is its current mode operation, which provides excellent line and load transient response. Additionally, the controller includes optional active voltage positioning (AVP) with adjustable gain and offset, improving the transient response further and reducing the output capacitance required.

The LTC3858EUH also incorporates a range of protection features to ensure reliable operation under adverse conditions. These include overvoltage protection, undervoltage lockout, overcurrent protection, and thermal shutdown. Moreover, the tracking and soft-start capabilities enable a controlled startup sequence for sensitive loads, minimizing inrush currents and preventing voltage overshoot.

In summary, the LTC3858EUH is a versatile and high-performance solution for dual output power supplies, offering advanced features and protection mechanisms to meet the stringent requirements of modern electronic systems.