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PMIC - Voltage Regulators - DC DC Switching Controllers

The LTC3812EFE-5#TRPBF is a high-voltage synchronous monolithic DC-DC switching controller designed for high-current, high-precision applications. It operates with input voltage up to 60 volts and output voltages as low as 1.8 volts. The output current is 5A and the output voltage is adjustable. The LTC3812EFE-5#TRPBF switching controller uses a wide range of feature set, minimizing the need for external components, reducing system costs and resulting in a smaller form factor.

The purpose of the LTC3812EFE-5#TRPBF application is to provide the necessary control voltage to operate in a step down or buck converter in various power management applications. It is a digitally programmable switching controller which uses the external integrated MOSFETs to perform the necessary functions. The LT3812EFE-5#TRPBF is designed to offer high-efficiency, low-noise, and fast transient response, as well as dynamic load sensing and regulation for point-of-load regulation in high-input voltage applications.

Features of LTC3812EFE-5#TRPBF

• Integrated LED driver with open LED indicator output.
• Internal PWM generator.
• Oscillator frequency Range: 375 kHz to 1.2 MHz.
• Input voltage range: 5 V to 60 V.
• Output voltage range: 0.8 V to 26 V.
• Output overvoltage protection up to 28 V.
• Undervoltage lockout.
• Programmable thermal protection.
• Programmable soft-start.
• Dynamic Loadline control.

Working Principle of LTC3812EFE-5#TRPBF

The LTC3812EFE-5#TRPBF works on the principle of synchronous buck topology. It operates with a maximum operating frequency of 1.2MHz and a minimum operating frequency of 375KHz and is a constant frequency pulse width modulation (PWM) controller. It includes a high-power stage and a low-power stage to control the power conversion.

The high-power stage consists of an oscillator, voltage reference and error amplifier coupled with a high-side driver. It handles the high power switching from the input voltage to the output. The error amplifier compares the voltage reference to the current output amplifier output to generate the PWM signal.

The low-power stage handles the low power control for the controller. It consists of a comparator, MOSFET driver and a few other components. It is used to provide the gate drive for the synchronous MOSFET.

In its complete application, the LTC3812EFE-5#TRPBF is connected to a pair of external power MOSFETs, a diode and a filter inductor to form the synchronous step-down power regulator. The output voltage is varied by adjusting a voltage reference and the duty cycle of the MOSFETs is varied using the PWM signal. The voltage reference also provides an indication of the output voltage at the non-inverting Operational Amplifier input of the oscillator.

The LTC3812EFE-5#TRPBF controllers provide superior line and load regulation as well as higher levels of transient response, flexibility and accuracy. The LTC3812EFE-5#TRPBF provides a range of features such as digital soft-start, programmable overvoltage protection and dynamic load line control. It is suitable for numerous high-voltage, high-current applications such as cellular base stations, industrial and high-power DC-DC converters.

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