DC-DC power modules are used in a wide range of industrial applications to provide the supply voltages required by low voltage, active or mixed-signal devices such as MCUs, ADCs, sensors and switches. By using power modules, industrial equipment designers can distribute power where it is needed, at the point of load, instead of using a centralized power scheme, which requires long traces and is susceptible to EMI.
Micrel’s MIC28304 micro power module is ideal for such applications. It provides a turnkey DC-DC conversion circuit in a 64-pin, 12mm x 12mm QFN package which enables designers to put the desired supply rail where they need it and to protect devices from high-voltage transients, as shown in Figure 1. The MIC28304, an integrated synchronous buck conversion solution, supports inputs of up to 70V and up to 3A, while handling a large difference between the input and output voltage values. This makes it ideal for noise-sensitive applications that are subject to voltage transients as high as 70V.
In typical applications, the MIC28304 is followed by a load switch to power 3.3V or 5V circuitry, and a multi-buck conversion stage to power microcontrollers, thus providing for correct power sequencing.
By using the MIC28304 module, designers avoid the need to evaluate, design, test and procure multiple discrete components for a buck conversion circuit. The micro power module is easy to integrate into a board design and may be placed near active components, thus helping reduce the number of long supply traces on the board.
The MIC28304 also offers better EMI performance than discrete solutions because of the close proximity of the components inside its package compared to discrete components, as shown in Figure 2. What is more, a design using the MIC28304 is more robust than a discrete solution since the module’s components are encapsulated inside its package and thus protected from vibrations and humidity.
The MIC28304 is offered in HyperLight Load® control and Hyper Speed Control™ options to address applications with various load power and sequencing conditions. HyperLight Load control maintains high efficiency in light-load conditions, and is normally used in systems that require the use of stand-by modes, as shown in Figure 3.
For applications in which the load varies, Hyper Speed Control offers fast responses to output-load transients.
|Part Number||Switching Frequency||Features|
|MIC28304-1YMP||200kHz - 600kHz||HyperLight Load|
|MIC28304-2YMP||200kHz - 600kHz||Hyper Speed Control|