LMR12020XSD/NOPB

The LMR12020XSD/NOPB is a switched capacitor voltage converter designed for a wide range of 4V to 14V input voltage applications. It can be used to generate a variety of output voltages from 0.8V to 12V. The device is capable of up to 1 A output current and supports PWM dimming when used with an external control circuit. The device is available in an SOIC-14 package, with a full complement of protection features, and can withstand harsh environments.

Features of the LMR12020XSD/NOPB

• Efficiency as high as 94%
• Wide 4V to 14V input range
• On/off logic and PWM dimming control
• Open output detection
• Overvoltage protection
• Output over-current protection
• Thermal shutdown protection
• Thermal overload protection

The LMR12020XSD/NOPB is a DC/DC converter based on a switched capacitor voltage conversion topology. The device employs a unique architecture which combines a dual-phase interleaved switching converter and a low side voltage detector. This architecture allows for high efficiency and fast transient response. The device can be used for either step-up or step-down voltage conversion, making it ideal for a wide variety of applications, such as automotive, industrial, networking, or consumer electronics.

The device combines an internal high-side switch, a low-side switch, and a low-side voltage detector to convert the input voltage to the desired output voltage. The device also features a current-mode control topology to ensure high efficiency and fast transient response. To improve the efficiency at light loads, the device employs an auto-skip cycle feature which reduces the number of switching cycles at light loads.

Applications of the LMR12020XSD/NOPB

• Battery-operated electronics
• Automated test equipment
• Industrial controls
• Networking and telecommunications
• Notebook and desktop computer peripherals
• Portable electronics

Working Principle of the LMR12020XSD/NOPB

The LMR12020XSD/NOPB consists of two P-channel MOSFETs on the high side and two N-channel MOSFETs on the low side. The high side MOSFETs are used to provide the input current, while the low side MOSFETs are used to return the current to the input. The device also features a low-side voltage detector which is used to sense the output voltage.

The device employs a current-mode control scheme. When the output voltage increases, the low-side voltage detector senses the output voltage and sends a signal to the current-mode controller, which then reduces the pulse width of the high-side switches to reduce the input current. This decrease in input current reduces the voltage across the inductor, so that the output voltage is maintained.

When the output voltage decreases, the low-side voltage detector senses the drop in output voltage and sends a signal to the current-mode controller, which then increases the pulse width of the high-side switches to increase the input current. This increase in input current increases the voltage across the inductor, so that the output voltage is maintained.

The device also includes protection features such as open output detection, overvoltage protection, output over-current protection, and thermal shutdown protection, to ensure safe and reliable operation.