XR76117ELTR-F

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XR76117ELTR-F belongs to the field of PMIC (Power Management Integrated Circuits), particularly Voltage Regulators, and DC DC Switching Regulators. It is a proprietary 1A high efficiency synchronous compact step-down regulator which supports switch frequency range from 200 kHz to 2.4MHz and suitable for low power low noise applications in portable device.

The XR76117ELTR-F integrates a 60V/1A synchronous BiSS-C MOSFET in a 4x4 QFN package. The device is optimized for load transient response, heavy load and light load efficiency, noise and ripple, and power savings in both active and standby modes. It uses an external current sense resistor to sense the current and provides accurate continuous load current regulation in no-load and light load conditions.

The features of XR76117ELTR-F are:

• Wide input voltage range of 2.5V to 60V
• ON/OFF control with external PMOS or NMOS
• Voltage tracking with external resistor divider
• Soft-start with external resistor
• Power-good output
• Programmable switching frequency
• Adjustable current limit protection
• Thermal warning/shutdown protection
• High efficiency operation without external Schottky diode

The working principle involves four main stages of operation. Operating voltage is applied to the XR76117ELTR-F and then the voltage regulation is performed by a series of comparators and logic circuits. The sensed load current is used to control an internal current limit signal. The power stage is used to convert the input voltage to regulated output voltage with efficiency of up to 98%.

The first stage is the activation of the power stage which reduces input voltage to the regulated output voltage. This is achieved by controlling the high and low sides of the power stage. Then the load current is then fed back to the point of regulation which is detected. The second stage occurs when the XR76117ELTR-F detects the load current. The sensed current is compared to the programmed current limit to determine the on/off ratio of the power stage. If the sensed current is higher than the programmed current limit then the power stage is turned off until the current drops below the programmed limit.

In the third stage the power stage is turned on and off according to the on/off ratio determined in the second stage. The power stage always operates at a fixed frequency even though the current is being turned on and off by controlling the duty cycle. This is called pulse width modulation. In the fourth stage the XR76117ELTR-F filters the noise generated by the high frequency switching of the power stage. This is done by using capacitors and inductors to reduce the ripple at the output.

The main advantage of using XR76117ELTR-F is its high efficiency, low noise and power savings in both active and standby modes. It also offers good load transient response, heavy load and light load efficiency, noise and ripple reduction, and precise programming control. Its wide input voltage range of 2.5V to 60V is great for high voltage applications, and its adjustable current limit protection plus thermal warning/shutdown protection ensures its reliability and safety.

In conclusion, XR76117ELTR-F is an excellent device for power management solutions requiring low power, low noise and high efficiency. It is great for designing step-down regulators for wide-input voltage range applications, and offers reliable protection features and precise programming control, enabling it to provide extraordinary performance for portable electronic devices.

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