IQ4805S

DC-DC converters are versatile and broadly used in various applications ranging from low power consumer electronics to large scale industrial, aerospace, and automobile applications. These converters accept a wide range of input voltages and output currents and provide efficient conversion of energy from one voltage level to another, with some form of regulation. The IQ4805S DC-DC converter is a high frequency (several hundred kilohertz), high current, high efficiency, synchronous electronic step-down converter designed to deliver the highest possible power density and performance in a small footprint.

IQ4805S Characteristics

The IQ4805S is ideal for low voltage (5V-12V) applications and can operate across a wide range of output current up to 20A. The device features a wide input voltage range (6-24V) and a non-inverting synchronous and near constant frequency voltage mode controller. The IQ4805S is optimized for size and efficiency, allowing it to achieve over 95% efficiency at high load currents without the need for an external sense resistor. The converter can also be programmed through external control pins, in order to tailor the output voltage, current limit, and slew rate according to the application requirements.

IQ4805S Application Field and Working Principle

The IQ4805S is ideally used in high current, low voltage applications where performance, efficiency, and size are key constraints. Some common applications for this device include power management / regulation, industrial, and automotive applications.

The working principle of the IQ4805S is based around the typical synchronous, constant frequency, voltage mode control architecture. On power up, an external resistor is used to select the output voltage, and feedback is used to maintain the set voltage. Energy is then transferred to the output with a high frequency synchronous current drive. This approach results in a high frequency (~1Mhz) circuit, with reduced components and improved efficiency.

Conclusion

The IQ4805S is an effective DC-DC converter for high current, low voltage applications. It’s ideal for applications where performance, efficiency, and size are key constraints. The working principle of the device is based around a high frequency, voltage mode architecture for improved efficiency and reduced component count.