The LTC3619EMSE#TRPBF is a monolithic switching regulator controller from Analog Devices, Inc. It is used to generate buck-boost switch-mode regulators with user-adjustable switching frequencies up to 3MHz. The controller provides up to 75V input voltage, is integrated with a low-side switch, and has external synchronization capabilities. It also works well with a wide range of inductors and capacitors, has undershoot and overshoot protection, and is capable of autonomously detecting the output voltage polarity, automatically transitioning from step-down to step-up operation and vice versa. The device meets the requirements for no-load power supply operation, has a 1.5% reference accuracy, and offers protection for short-circuits, open-circuits, and open-loop and over temperature conditions.