LT3685EDD#TRPBF Integrated Circuits (ICs)

The LT3685EDD#TRPBF is a 3A high-efficiency, synchronous DC/DC converter with a wide input voltage range optimized for use in automotive and industrial applications. This device provides adjustable output voltage in the range of 1.5V to 8.0V, with an option of a separate, fixed output voltage setting that can be enabled by an external voltage source. The operating temperature range of the LT3685EDD#TRPBF extends from -40 to 125°C, a key feature for applications that operate in extreme temperatures. In addition, this device offers both low external component count and a thermal shutdown circuit.

LT3685EDD#TRPBF Application Field

The LT3685EDD#TRPBF is well-suited for a variety of automotive and industrial applications, including power supply systems, power management, and energy storage. Furthermore, it is suitable for a range of charging and discharging applications, such as automotive alternator charging, auxiliary battery charging, battery test systems, and solar power harvesting.

LT3685EDD#TRPBF Working Principle

The LT3685EDD#TRPBF is designed to be a low-noise, high-efficiency DC/DC converter that\'s adjustable to a range of output voltages. It integrates a high-side MOSFET, a low-side MOSFET, high-side MOSFET current-sense circuitry, low-side MOSFET current-sense circuitry, and a low-noise, current-mode PWM controller. The device regulates the output voltage by sensing the voltage drop across the MOSFETs and adjusting the duty cycle of the PWM compared to the voltage at the feedback node of the device. Furthermore, the device is capable of both synchronous and non-synchronous operation, offering an adjustable switching frequency up to 1.2MHz for optimal efficiency.

The LT3685EDD#TRPBF features a low supply current of 200uA and a low quiescent current of 1.3mA when in shutdown mode. To maximize battery life and reduce power loss, it enables both hysteretic operation and forced continuous conduction mode. Furthermore, the device integrates a range of safety features, such as fixed and adjustable undervoltage lockout, current limit, and overtemperature protection.