LT1268BCT#PBF

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LT1268BCT#PBF is a non-synchronous DC/DC buck switching regulator. It is suitable for use as a direct replacement or upgrade from linear or low current buck regulators in a variety of applications including video player, notebook, hard disk drive, Liquid Crystal Display (LCD), television, router, monitor and set-top boxes. This is a family of ever-evolving, efficient and cost-effective integrated circuits. It is designed to offer maximum flexibility through the wide range of available packages and pin-compatible parts.

The LT1268BCT#PBF offers a synchronous rectifying, high-side N-Channel MOSFET and a low-side P-Channel MOSFET, which results in a higher efficiency compared to other switching regulators. The integrated high-side driver provides the necessary gate drive to both MOSFETs, further enhancing efficiency and reducing the external components count. In addition, a unique dynamic frequency control feature reduces power dissipation and increases system efficiency.

In order to ensure stability with a variety of external capacitor’s, the LT1268BCT#PBF integrates a voltage-mode PWM controller. Its oscillator frequency is set by an external resistor, allowing for flexibility in design and performance. The LT1268BCT#PBF operates in the 0.4V to 10V output voltage range and is capable of providing up to 4A continuous output current. An internal soft-start function eliminates the inrush current at start up, further improving system performance and efficiency.

Working principle of the LT1268BCT#PBF is fairly simple. It consists of a PWM controller and two power MOSFETs. The PWM controller is connected to the input voltage supply and serves to provide the control signals for the two MOSFETs. The PWM controller is initialized to determine the on and off times of the two MOSFETs, and accordingly, the output voltage as well as the current.

The LT1268BCT#PBF is used in a variety of applications such as personal computers, embedded microcontrollers, audio power amplifiers, DVD players, and Global Positioning System (GPS) receivers. It is also used in portable electronic products such as cell phones, digital cameras, and portable media players.

The LT1268BCT#PBF can be used to reduce output noise generated by conventional linear regulators, while allowing a buck switching regulator to operate within a narrow 3.3volt to 5volt voltage range. The device also provides an input current limitation up to 200mA, which allows designers to guarantee the available input current is sufficient to feed any output load.

In summary, the LT1268BCT#PBF is an ever-evolving family of non-synchronous DC/DC buck switching regulators. It offers a synchronous rectifying, high-side N-Channel MOSFET and a low-side P-Channel MOSFET, which results in higher efficiency than other switching regulators. It is used in a variety of applications, including personal computers, embedded microcontrollers, audio power amplifiers, DVD players, Global Positioning System (GPS) receivers, cell phones, digital cameras, and portable media players. Its working principle is simple; the PWM controller is connected to the input voltage supply and serves to provide the control signals for the two MOSFETs. It also provides an input current limitation up to 200mA, which allows designers to guarantee the available input current is sufficient to feed any output load.

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