LTC7801HUFD#PBF

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The LTC7801HUFD#PBF is a DC to DC switching controller designed for use in highest efficiency, low-input-voltage, isolated DCDCs. The LTC7801HUFD#PBF controller can operate from input voltages as low as 1.5V while providing a wide output range up to 36V with a high efficiency performance of up to 96%. It features a Compensated Peak Current Mode control, allowing it to regulate current across a wide load range, out of the box. The LTC7801HUFD#PBF also includes an integrated RSA (Ramp Set Amplifier) to minimize EMI (electromagnetic interference) noise, together with an on-board comparator and MOSFET driver.

The LTC7801HUFD#PBF can control both step-down (buck) and step-up (boost) converters, as well as flyback and SEPIC (Single Ended Primary Inductance Converter) topologies. It is also suitable for ultra-low-voltage systems requiring a strong synchronization between a wide range of input and output voltages, such as low-voltage, high-ampere-hour battery packs. The LTC7801HUFD#PBF also provides valley-mode compensation to improve the transient performance.

The LTC7801HUFD#PBF integrates fast response and high performance features, enabling greater flexibility in soft-start, load transient response and low component count designs. The LTC7801HUFD#PBF has a fast internal MOSFET gate driver to reduce gate charge loss and improve the overall efficiency. It also features an integrated 1.5A peak current gate driver, which allows it to operate large MOSFETs with low gate resistance. It also has a wide operating temperature range of -40°C to +125°C.

The LTC7801HUFD#PBF is specifically designed for use in high capacity, 8A+ DC to DC switchmode converters operating from low input voltages. Its main applications include telecom and datacom components, laptop PC/notebook etc. It offers enhanced performance, low component count designs, and a comprehensive set of features such as adjustable-frequency compensation and valley-mode compensation. It is available in a 6-pin SOT23 package.

The LTC7801HUFD#PBF DC to DC converter works based on the Power topology. It is basically a switch mode power supply (SMPS) technique with a high frequency via the open loop structure. The input voltage range is from 1.5V to 36V and the output requires a minimum of 5V up to 36V and any intermediate voltage value. The MOSFETs consist of two NMOSs and two PMOSs in a voltage-driven configuration. The PMOSs are used to regulate the output voltage by controlling the duty cycle, whereas the NMOSs are used to turn the power switch on and off.

The duty cycle of the switches varies depending on the output voltage and the feedback signal. The power stage of the LTC7801HUFD#PBF is connected to the four inductor pins of the SMPS. The control loop of the SMPS is controlled by the PWM controller which regulates the duty cycle and governs the switching of the MOSFETs to obtain the required output voltage. The typical power stage of the LTC7801HUFD#PBF includes an L-C-R network consisting of an inductor, a capacitor and a resistor. The inductor stores the energy, the capacitor filters the output voltage, and the resistor provides necessary current to the PWM controller.

The output is regulated by an internal error amplifier in order to keep the output voltage in line with the reference voltage. The voltage reference is generated from a Zener diode. The output voltage is then monitored by a voltage divider circuit on the output line and fed back to the control loop of the switch mode power supply. The output voltage is then regulated by the PWM controller and the switch MOSFETs in order to maintain a constant output voltage.

In conclusion, the LTC7801HUFD#PBF is a robust DC to DC switching controller designed for use in highest efficiency, low-input-voltage, isolated DCDCs with a wide operating temperature range of -40°C to +125°C. It features a Compensated Peak Current Mode control and includes an integrated RSA (Ramp Set Amplifier) to minimize EMI (electromagnetic interference) noise, together with an on-board comparator and MOSFET driver. It is suitable for ultra-low-voltage systems requiring a strong synchronization between a wide range of input and output voltages. The output is regulated by an internal error amplifier, with the PWM controller governing the switching of the MOSFETs to provide a constant output voltage.

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