L5989D

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The L5989D is a DC/DC converter that is part of the regulation and power management integrated circuit (PMIC) product family. It is a switching regulator that provides an adjustable regulated output of up to 15 volts. The L5989D is a monolithic integrated circuit consisting of a switch-mode voltage regulator, an internal power MOSFET, and a voltage reference. Its output current limit can be adjusted from 0 to 3A with external resistors. This makes it suitable for a wide range of applications including power management systems in automotive, industrial, and consumer equipment, as well as high-current supplies.

The L5989D\'s main feature is its low input voltage drop due to its switch-mode architecture. It is designed to operate with the minimum amount of power loss, allowing for maximum efficiency. This makes it well suited for applications where power efficiency is important.

The L5989D is a non-synchronous, step-down (buck) converter with a single switch. It has an integrated high-side N-channel MOSFET with an on-resistance of typically 0.38Ω. The converter operates in "pulse-width modulation" (PWM) mode. This mode is characterized by the converter switching at a constant frequency and varying the switch "on" time to adjust the output voltage and/or current. The switching frequency is determined by an external resistor and is adjustable from 250 kHz to 2.3MHz.

The L5989D is designed with a cycle-by-cycle current limit feature. This allows the converter to limit its output current under certain conditions, providing protection against overcurrent conditions. The cycle-by-cycle current limit can be programmed with an external resistor.

The L5989D can also be configured for forced PWM mode. This mode sets the ON time of the switch to a fixed value, resulting in a constant output voltage. This mode can be used to provide a regulated output with low noise and ripple.

The L5989D also has a power good output that indicates the status of the output voltage. The power good threshold is set with an external resistor and can be adjusted from 0.8 to VCC.

Other features of the L5989D include a power-saving standby mode, low dropout, undervoltage lockout, an adjustable soft-start feature, a soft-stop function, and thermal shutdown protection. It is offered in a Thermally Enhanced 5x5 mm QFN package.

The L5989D is a versatile device that can be used in a variety of applications requiring a regulated DC output. With its low input voltage drop, its adjustable current limit, and its adjustable output voltage, it is an ideal choice for many power-management applications.

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