LT3663HMS8E#PBF

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LT3663HMS8E#PBF Application Field and Working Principle

The LT3663HMS8E#PBF is a synchronous step-down switch-mode DC regulator from the popular LT family of DC power regulators. This high-efficiency regulator operates from an input voltage from 3 V to 60 V and delivers up to 10 A continuous output current with a typical efficiencies of over 97%. The device integrates high-side and synchronous rectifiers, a 14.4 mΩ on-chip power switch, and other control and protection circuitry with an adjustable switching frequency up to 2 MHz.

The LT3663HMS8E#PBF is particularly suited for hand-held, battery-powered systems due to its tiny size. It is available in a small-footprint 8-pin HSOP package with a power density could be as high as 3.7 W/cm², introducing a significant improvement in power rail thermal performance in small, hand-held devices..

Working Principle

The LT3663HMS8E#PBF works on the buck converter topology. This type of topology uses the two active switches M1 and M2 to easily regulate the output voltage to its desired level. The inductor, along with the output capacitor, filters the output, which then is rectified by the output diode. Two resistors form the voltage divider to sense the output voltage.

Unlike other linear regulators, the buck converter creates a pulse-width modulated (PWM) signal in its input of the M2 transistor. When M2 is ON, the current flowing through the inductor rises; and when M2 is OFF, this current decreases. Due to this reason, M2 switches on and off, according to the PWM signal, to control the output voltage. The LT3663 is the controller IC responsible to deliver the PWM signal that drives the M2 switch.

The controller IC contains two sections: one for the PWM, and another for the control loop for the output voltage regulation. When the output current increases, automatically, the IC sends a signal to adjust the PWM signal in order to increase the duty cycle, and vice versa. Due to this signal, the voltage at the sense resistor within the control loop and the VREF signal, compared in the loop amplifier, decrease. This will signal the loop amplifier to alter the PWM signal, or in other words to increase the duty cycle, so the output voltage is regulated.

Protection Features

The LT3663HMS8E#PBF includes multiple protection features that can help protect against unexpected and/or catastrophic oversights. The pin includes temperature, input/output and over-current protection. The input, output and fault protection range is 3 V to 60 V and can help prevent the device from exceeding these voltage levels even if external conditions occur which might try to push rates outside of these ranges.

The thermal protection features ensure that the device remains at a safe operating temperature. It will monitor and adjust the power drawn from the core to prevent it from exceeding a certain value. The general fault protection is also incorporated, which will disable the device should any fault occur.

Conclusion

The LT3663HMS8E#PBF is a high power, synchronous, step-down DC regulator from the popular LT family of DC power regulators. It has exceptional efficiency, a tiny size, and a wide input and output voltage range. This regulator is designed for use in hand-held, battery-powered systems and it comes with multiple protection features to prevent catastrophic faults. This makes the LT3663HMS8E#PBF DC regulator an ideal choice for modern handheld systems requiring high power, efficiency and reliability.

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