LTC3850EGN Dual Output Synchronous Step-Down DC/DC Controller

The LTC3850EGN is a high-performance, dual-output synchronous step-down DC/DC controller manufactured by Linear Technology, now part of Analog Devices. This versatile controller is designed to drive all N-channel power MOSFET stages, which can generate outputs that can be as low as 0.8V with a high degree of accuracy. The LTC3850EGN operates over a wide input voltage range of 4.5V to 24V, making it suitable for a variety of applications, including computing systems, telecommunications, automotive, and industrial equipment.

One of the key features of the LTC3850EGN is its powerful 1.1Ω on-chip gate drivers. These drivers are capable of minimizing switching losses by driving the external MOSFETs efficiently, which is particularly beneficial when managing high current levels. The device also offers a selectable fixed frequency from 250kHz to 750kHz and can be synchronized to an external clock within the same frequency range.

The LTC3850EGN includes a TRACK/SS (tracking/soft-start) pin, which allows for the tracking of an external voltage or provides a controlled ramp-up of the output voltage. This feature is essential for applications that require a specific start-up sequence. Additionally, the device ensures a safe operation through its overvoltage protection, undervoltage lockout, and overcurrent protection features.

For thermal management, the LTC3850EGN incorporates a phase-lockable frequency modulation (PLL) for reduced noise and a foldback current limit for enhanced system reliability. The device is available in a compact 28-lead SSOP package, which is ideal for space-constrained applications.

Overall, the LTC3850EGN is a robust, efficient, and flexible solution for modern power supply designs that require dual outputs with precise voltage regulation. Its combination of features ensures that it can meet the stringent requirements of a wide range of electronic systems, providing designers with a reliable and high-performance power management solution.