The PM6670S is a complete DDR2/3 power supply regulator designed for portable applications to meet JEDEC specifications. It integrates a constant on-time (COT) buck controller, a 2 Apk sink/source low dropout regulator (LDO), and a 15 mA low noise buffered reference. The COT architecture ensures a fast transient response supporting both polymeric and ceramic output capacitors. An embedded integrator control loop compensates the DC voltage error caused by the output ripple. The 2 Apk sink/source linear regulator provides the memory termination voltage with a fast load transient response. The device is fully compliant with system sleep states S3, S4, and S5, setting the LDO output to high-impedance in the suspend-to-RAM state, and performing the tracking discharge of all outputs in the suspend-to-disk state.
The document provides a comprehensive guide for the PM6670S device, a constant on-time buck controller with integrated LDO designed for portable applications requiring DDR2 or DDR3 memory power. It details the switching section (VDDQ) and termination voltage generation (VTT), supporting both polymeric and ceramic output capacitors.
The device supports an input voltage range from 4.5 V to 28 V.
The controller has a fixed soft-start duration of 3 ms.