LTC1148HVCN-3.3#PBF

The LTC1148HVCN-3.3#PBF is a High Voltage DC-DC Step-Down Controller from Linear Technology that offers high efficacy and is suitable for battery powered systems, small converters and vehicle applications. This high-voltage controller works off an input voltage operating range of 4V to 20V and supplies an output voltage of 3.3V with a maximum output current of 5A. It is a highly efficient Switched Mode Power Supply (SMPS) that offers low power consumption and a wide input voltage range. The main features of the LTC1148HVCN-3.3#PBF are its 0.5μA low quiescent current, fast transient response, adjustable soft-start time, ideal diode emulation mode with >95% efficiency, and an adjustable maximum operating frequency up to 500KHz.

The LTC1148HVCN-3.3#PBF has a variety of applications in the DC-DC step-down market, such as laptop computer adapters, battery-powered medical systems, automotive electronics, distributed power systems, wireless communications, and portable/embedded designs. It is ideal for applications that need an accurately regulated 3.3V output or for variably-loaded systems, since the output voltage can be set to an exact voltage. The LTC1148HVCN-3.3#PBF also offers a variety of advanced features, such as adjustable soft-start, which allows the system to gradually increase the output voltage and current, reducing the output voltage turn-on-on-transients; forced Continuous Conduction Mode (CCM) operation, which allows the controller to immediately reduce the output ripple voltage and output power in the event of an overload without entering a discontinuous mode; and adjustable Slew Rate Control, which allows the controller to smoothly increase or decrease the output current of the switch corresponding to an increase or decrease in output voltage.

The LTC1148HVCN-3.3#PBF is designed to provide high-efficiency, low-cost, and reliable power conversion. The Input voltage is applied to the VIN pin, then it passed through an internal switch, the output is then regulated to a set voltage by the current limit circuit and is connected to the VOUT pin. The controller senses the Feedback voltage, compares it with its reference voltage, and adjusts the input current according to the difference between them. Internally it also differentiates between a drop in the output voltage to shut off the controller, and a rise in the output voltage to turn it back on. This provides a voltage regulation loop that constantly keeps the output voltage in check.

In summary, the LTC1148HVCN-3.3#PBF is an efficient high-voltage DC-DC step-down controller suitable for various applications. Its adjustable soft-start time, ideal diode emulation mode, and adjustable maximum operating frequency up to 500KHz make this device suitable for use in very efficient, low power consuming systems. Additionally, its small package size, heavy duty cycle performance, and wide temperature range make this device suitable for use in automotive electronics and battery-based medical systems.