LTC3895IFE#PBF

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The LTC3895IFE#PBF is a sophisticated, second generation synchronous DC/DC step-down switching controller that provides a constant frequency, valley current mode control with internal slope compensation. Integrated in the IC is a wide input voltage range buck regulator, internal 50V power MOSFET driver, numerous features designed to minimize external components, while still maintaining versatile and precise design control. With its synchronous operation and exceptional level of integration, the LTC3895IFE#PBF is ideal for a wide range of Point of Load power supplies.

The LTC3895IFE#PBF is a member of the switching regulators family of products available from Linear Technology. Within this product family it is classified as a PMIC (power management IC), Voltage Regulator, and DC/DC Switching Controller. This class of products are used for voltage regulation, current regulation, and DC/DC conversion and provides a single solution of many problems. These types are used in applications requiring precise control of output voltage and current, as well as in applications requiring precise control of input ripple current.

The LTC3895IFE#PBF is specifically designed for a wide range of point-of-load power supplies. Due to its exceptional level of integration, it is suitable for applications involving one or multiple outputs over a wide range of voltages and current levels. It provides a programmable output voltage regulation with input voltage levels up to 50V, low quiescent current, low output ripple, and fast transient response. The wide input voltage range allows the device to accommodate a large range of system voltages including –12V to 24V, as well as input/output combinations of up to 200V. As a result, it can be used to power FPGAs, ASICs, microprocessors, and digital signal processors.

The LTC3895IFE#PBF is a versatile and flexible device that operates with a wide variety of power topologies. It is well suited for continuous-conduction or discontinuous-conduction mode operation, and includes a switching frequency synchronization function for multi-phase applications. In addition, it can be used to synchronize its switching frequency to an external clock. The controller also offers a constant on-time mode, enabling the use of small external inductors, as well as high-efficiency operation. The device includes a variety of control and protection features for improved system reliability as well.

The outermost component of the LTC3895IFE#PBF is the switching MOSFET driver. This device is used to switch high-side MOSFETs at high frequency. The driver provides the necessary current and voltage levels to safely turn on and off the power device. It also provides overcurrent protection, an internal PWM oscillator with adjustable frequency, clock synchronization, and input under-voltage protection. In addition, it provides a programmable cycle-by-cycle current limit.

At the center of the LTC3895IFE#PBF is the digital control loop which implements voltage/current mode control. This control loop regulates the output voltage and current of the system. It utilizes a valley current mode control, with an adjustable slope compensation scheme. The loop provides multiple protection and fault signals to the host controller, and allows for adjustable soft-start or pre-bias operation. In addition, the control loop includes a slew-rate control to manage the inrush current at startup.

The LTC3895IFE#PBF is a fully integrated switching controller that provides excellent performance, high efficiency, wide input and output range, adjustable modulation, fast transient recovery and slope compensation, and flexible synchronization options in a single package. With these features, it is well suited for a wide range of PoL applications.

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