LDO regulator features low noise, fast transient response

By Alex Pluemer, contributing writer

MagnaChip Semiconductor Corp . recently introduced a low-power, low-noise, and fast-transient low-dropout (LDO) regulator for ball-grid array (BGA) solid-state drive (SSD) components typically used in mobile devices.  LDO regulators are used to regulate DC output voltage even when the supply voltage approaches the output voltage. The benefits of LDO regulators compared to DC-to-DC regulators include no switching noise, smaller size, and design simplicity.

BGA SSDs integrate an SSD controller with a memory chip (i.e., DRAM or NAND flash) into a BGA package. BGA SSDs have the advantage of being approximately 60% smaller in size than non-BGA SSDs, making them suitable for mobile device applications, including laptops, tablets, and smartphones.

BGA SSDs require a stable power supply to support the high variation in their read/write loads.  The LDO regulator features an industry-leading 0.5% fast-transient response, according to the company, to support the need for a stable power supply. The device also provides a stable 1.2-V output voltage in the 1.65-V to 3.3-V input voltage range and a maximum current of 500 mA.

The LDO regulator delivers a low quiescent current of 75 µA, which improves power efficiency and extends battery life in mobile devices, and boasts a high power supply rejection ratio (PSRR) to eliminate input power noise. It also incorporates protection against current surges above rated specs and improved power monitoring.