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Linear regulators eye SoCs, DDR memory in digital consumer apps

Posted: 19 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear regulator? soc? ddr memory? double data rate memory? cm3132?

The new CM3132 and CM3121 devices from california micro devices Corp. (CMD) are touted to be the industry's first family of fully-integrated, all linear regulator solutions optimized for powering SoCs and DDR (Double Data Rate) memory in digital consumer electronics and PC peripherals.

According to the company, the new products are designed to provide the industry's lowest cost and smallest footprint power solutions, replacing multiple discrete regulators and eliminating the need for costly external FETS and inductors.

The CM3132 integrates three all linear regulators to supply the system's VCORE power, plus the VDDQ and VTT power for DDR memory. The VCORE regulator can supply up to 1.5A with an adjustable output voltage as low as 1.2V, the VDDQ regulator provides up to 1.5A with a fixed output voltage of 2.5V, and the VTT regulator is a push-pull linear regulator that accurately sources and sinks current at 1.25V up to 500mA.

Meanwhile, the CM3121 integrates the DDR VDDQ and VTT power supplies for customers who want a single chip DDR solution but want to retain a separate VCORE regulator. The VDDQ regulator can supply up to 1.5A with an adjustable output voltage from 1.7V to 2.8V, allowing it to be used for DDR I and DDR II memories, and the VTT regulator accurately sources and sinks up to 500mA at half of VDDQ.

"Competing DDR power solutions have been optimized for higher current PC applications," said Joe Salvador, CMD's director of marketing for computing and digital consumer products. "These solutions typically consist of integrated switching regulators that require external FETs and inductors as well as a separate VCORE regulator. By optimizing our design for lower current application requirements, we can provide a complete DDR + SoC power solution in a single, low-cost 8-pin package," Salvador added.

Other features

Suitable for PC printers and digital consumer applications such as digital TVs, STBs, DVD players, PVRs (personal video recorders) and game consoles, both products integrate overcurrent protection, overtemperature protection and reverse current protection, as well as under voltage lockout. Both are housed in PSOP-8 packages, and are available in eutectic and lead free versions.

The CM3132 and CM3121 are currently sampling along with evaluation boards. The CM3132 is priced at $1.16 each and the CM3121 is priced at 77 cents each in 1,000-unit quantities. Volume production is scheduled for Q4 2004.

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