5A to 2A dc-dc converters are ultra-small

MURATA POWER SOLUTIONS MYR series of PicoBK Non-Isolated 5A to 2A dc-dc converters integrate a coil and a control IC into a single package. The ultra-small form-factor measures from 2.5 x 2.0 x 1.0 mm to 3.1 x 4.7 x 1.3 mm depending on model. Device are significantly smaller than discrete solutions. Units achieve high efficiency, low noise, and high heat dissipation. The environmentally friendly, low power consumption step-down devices are designed for a 2.5V to 5.5V source such as a Li-ion battery to as high as 18V for some models.

click here for more info