LTC1735IS-1#PBF

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The LTC1735IS-1#PBF device is a member of the PMIC - Voltage Regulators - DC DC Switching Controllers family. It is designed to provide efficient, cost-effective control in switch-mode applications such as multiple output power supply systems, isolateduplink converters, and telecommunication systems. This device offers many features that include programmable operating frequency, integrated overshoot protection, programmable soft-start time, adjustable current limit, and power-good signal output.

The LTC1735IS-1#PBF is a oscillator and driver integrated circuit,designed to drive a low-side N-channel power MOSFET in a synchronous buck, boost, or inverting converter. It incorporates a precision oscillator and control circuitry that enables it to perform the following functions when operating in the buck topology:

• Constant frequency operation
• Dynamic voltage scaling
• Programmable overvoltage protection
• Programmable current limit
• Programmable soft start time
• Power good signal output

These functions are implemented through various internal circuitry, including a sense amplifier, comparator, oscillator, and voltage reference. The sense amplifier is used to monitor the output voltage of the converter, and to generate a current limit signal (LIMIT) if the output voltage exceeds a specified value. The LIMIT signal is used to ensure that the peak current limit of the power MOSFET is not exceeded. The dynamic voltage scaling (DVS) feature of the LTC1735IS-1#PBF is enabled by sensing the output voltage of the converter and adjusting the oscillator frequency accordingly. The programmable soft start time allows the output voltage to be ramped up slowly to reduce inrush currents and minimize output capacitor ripple. The power good signal output provides an indication of the output voltage status and is used to alert the system if the output voltage is outside of the valid range.

In addition to the control features, the LTC1735IS-1#PBF is also equipped with a fault detection circuit that monitors the power input and output of the converter, and will assert the power good output if the power input or output is outside of the valid range. This fault detection circuit is also programmed to open the MOSFET gate drive if any input or output voltage conditions exceed the specified limits.

The LTC1735IS-1#PBF is an ideal solution for applications with stringent requirements on efficiency and output voltage accuracy. It is designed to provide robust, reliable operation with a minimum of user supervision. The integrated features and ease of use make the LTC1735IS-1#PBF a cost effective solution for many switch-mode power supply applications.

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