L200CH

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DC DC Switching Regulators are of various types and the L200CH application field and working principle are also different from others. Generally, L200CH is a high precision DC DC Buck Converter which is especially suitable for very low input voltage applications such as at the battery side of portable systems. As a result, there are various benefits associated with L200CH starting from a very low quiescent current of 4.6uA, single switch operational boosting the efficiency of the system in comparison with other DC-DC switching regulators. Moreover, it is also fully protected by Over Voltage Protection (OVP) as well as under Voltage Lockout (UVLO). The overload protection is available via foldback current limit which helps in maintaining the system operation integrity and reliability. Furthermore, due to the availability of the wide input voltage range, it can support a wide variety of input voltage levels.

In the L200CH application field, the IC is mainly used in portable systems such as mobile based communication systems, GPS, laptops and portable media players. The applications of the L200CH range from providing supply voltage to the system to providing 5V power from a Li-battery to the system. Moreover, this DC DC switching regulator is also used as a voltage source for powering a small motor for toys or for carrying out pulse modulation for controlling servo motors in remote-controlled cars.

L200CH is a synchronous DC DC Buck converter IC which works on the principle of Pulse Width Modulation (PWM). The PWM technique helps in obtaining highly precise control over the load current from the load capacitor. It works by switching the power across the capacitor to get a desired load current. As the two switches i.e M1 and M2 have opposite polarities, the transfer of current takes place by switching between the two switches. In this way, the four nodes i.e. The current source, the ground, the load and the input are configured in a CORNER-FET structure which helps in resolving the noise gains due to PWM.

L200CH consists of the integrated features of a current source and over voltage protection (OVP) circuitry which makes it suitable for use in very low power applications. The OVP circuit helps in managing the voltage levels within predetermined limits and regulates the external power supply of the system. Moreover, it also includes a dc/dc regulator which is used for off-loading the current from the load capacitor and thereby making the system more efficient in operation. Furthermore, the integrated foldback current limit feature of the L200CH helps in providing a robust over-load protection to the system.

For the efficient functioning of the device, it requires an external clock, control logic and an output capacitor. The external clock generates the switching frequency which is then used by the control logic for the generation of the PWM signals. The output capacitor provides a load to the current source and helps in maintaining the output voltage at a certain level, either constant or with slight ripple voltage.

In conclusion, L200CH is a highly efficient DC-DC Buck Converter which is especially suitable for portable systems and low input voltage applications. Its low quiescent current, over and under voltage protection, and integrated foldback current limit makes it more suitable for such applications. Moreover, the CORNER-FET structure helps in resolving the noise gains due to PWM and helps the system to run in a more efficient manner.

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