The LTM4703 from Analog Devices is a complete 12 A step-down Silent Switcher 3 μModule® (micromodule) regulator in a tiny 6.25 mm x 6.25 mm x 5.07 mm ball grid array (BGA) package. The package includes the switching controller, power MOSFETs, an inductor, and support components. Operating over an input voltage range of 3 V to 16 V, the LTM4703 supports an output range of 0.3 V to 6 V. A single resistor sets the output voltage, providing unity gain operation over the output range resulting in virtually constant output noise that is independent of the output voltage. Only bulk input and output capacitors are needed to finish the design.

The LTM4703 employs Silent Switcher 3 architecture with internal hot loop bypass capacitors to achieve low electromagnetic interference (EMI) and high efficiency. Also, the LTM4703 has an ultra-low-noise architecture to obtain exceptional low-frequency (<100 kHz) output noise. These low-EMI and low-noise features make the LTM4703 ideal for high-current and noise-sensitive applications that benefit from the high efficiency of a synchronous switching regulator. The LTM4703 is available with a RoHS-compliant terminal finish.

The EVAL-LTM4703-AZ evaluation board is a step-down DC/DC switching converter featuring the LTM4703 μModule regulator. The EVAL-LTM4703-AZ is designed to deliver 12 A maximum output current from a 4 V to 16 V input with a default switching frequency of 400 kHz. An external resistor is placed from the RT pin to GND (R7) to set the switching frequency.