LT1533CS#PBF

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The LT1533CS#PBF is a monolithic controller in a fixed voltage series, generally used for various DC/DC switching regulator applications. As an IC series featuring fully integrated gate drivers and regulation loops, the LT1533CS#PBF raises the bar for high performance DC/DC switching at high voltage levels.

Multiple integrated features of the LT1533CS#PBF, including current limit and short circuit protection, PWM slopes, overvoltage protection and short-to-ground protection, make it an ideal choice for high performance DC/DC regulator applications. The monolithic integrated architecture saves space, power, and thermal management. Combining an efficient, adjustable output current limit with a low minimum on-time (low gate control on resistance), the LT1533CS#PBF preserves the stability of the oscillator and optimizes system performance by reducing the output voltage ripple.

The LT1533CS#PBF is available in the TO-220-5, TO-263-5, TO-263-7 and SOT-223-5 packages, with a UVLO (under voltage lock out) of 11V, and operating temperature range from -40 to +85 degree Celsius. The LT1533CS#PBF’s regulation loop allows for a wide input voltage range which prefaces circuit configuration flexibility. It is suitable for heavy capacitive load applications, where high current and fast transient times can be safely managed.

The LT1533CS#PBF supports a wide range of input voltage, wide output voltage setpoints, fast transient response and high mean time to failure (MTTF) through the use of a patented daisy chain architecture that includes current-sense configuration and dual level loop compensation techniques. Its integrated output voltage monitoring feature adds additional protection by allowing the user to set the desired voltage under-voltage/over-voltage thresholds. With its improved transient response, the LT1533CS#PBF is well-suited for applications requiring high speed switching of loads exceeding the rated output voltage.

The LT1533CS#PBF offering is available in different configurations, like optimized for switching power supply design or conventional DC/DC Converter applications. Moreover, the user can configure various parameters such as output voltage, maximum duty cycle, and current limit without the need of external components, allowing for easy and efficient design.

The LT1533CS#PBF’s operating principle is relatively simple. A PWM signal is generated by a voltage feedback loop and fed to an internal oscillator circuit, which generates a sawtooth waveform with a constant frequency. The PWM signal is combined with the sawtooth waveform when compared to a voltage reference and the resulting output is used to control the gate of an output power MOSFET. Thus, the MOSFET is switched on and off in a pulse width modulation (PWM) method to control the average voltage between the input and the output of the converter. Finally, an internal current limiting circuit is used to monitor the load current and can be adjusted to regulate the current level.

The LT1533CS#PBF is suitable for DC/DC converter applications such as battery, ATX supply, handheld device, automotive and industrial motor drives, as well as, voltage regulators, DC/DC converters, buck converters, linear regulators and voltage stabilizers.

In conclusion, the LT1533CS#PBF series is a high-performance digital switch-mode power supply controller, designed for applications which require high performance, high voltage regulators or DC/DC converters. With embedded protection features, the LT1533CS#PBF is optimally suited for various and varied applications, with no external components required for configuration.

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