California Micro Devices Introduces Industry's First Three-in-One All-Linear DDR Regulator
December 08 2003 - 6:30AM
PR Newswire (US)
California Micro Devices Introduces Industry's First Three-in-One
All-Linear DDR Regulator MILPITAS, California, December 8
/PRNewswire/ -- - CM3131 Family Delivers Lowest Cost and Smallest
Footprint Solution for PCs and Set-Top Boxes California Micro
Devices (Nasdaq: CAMD), today announced the industry's first fully
integrated, all-linear DDR voltage regulator solutions for
cost-sensitive PC and consumer set-top applications. The CM3131
family of highly integrated all-linear voltage regulators provides
a complete, single-chip power solution for Double Data Rate (DDR)
and DDR II SDRAM memories and are the industry's first products to
integrate three separate linear regulators to provide VDDQ, VTT and
VSTBY power from a single chip. When compared to existing switching
regulator based solutions, the CM3131 family of solutions
eliminates the need for multiple external FETs and inductors,
allowing for a solution cost reduction of up to 70 per cent and a
55 per cent reduction in board space. The CM3131 also incorporates
innovative intelligent power sequencing control logic to simplify
transitions between various PC power states (S0-S5), providing
further solution cost savings. (Photo:
http://www.newscom.com/cgi-bin/prnh/20031208/SFM067 ) Because the
CM3131 uses an all-linear integrated approach, an entire DDR power
solution can be implemented using one CM3131 in a small PSOP-8
package with a single external N-FET, eliminating the need for the
multiple FETs and inductors that are required in switching
solutions. For high power systems, the CM3131 is also available in
a PSOP-14 package that allows two external unmatched N-FETS to be
connected, distributing heat dissipation between them while still
providing lower cost, component count, and board space than
competing solutions. "We worked very closely with leading customers
during the definition of this product to achieve their goal of the
lowest cost and smallest footprint possible for a complete DDR and
DDR II power subsystem," said Joe Salvador, director of marketing
for computing and consumer electronics products at California Micro
Devices. "This product family demonstrates our continued investment
in developing unique application specific analog products for our
PC and consumer customers." How They Work To provide the main
power, a linear regulator driving an external N-FET provides up to
15A of current at 2.5V for DDR and 1.8V for DDR II. An optional
external feedback resistor divider allows the system designer to
adjust the output voltage for use with different memory controllers
requiring other voltages. The VTT regulator is a linear sink source
regulator powered from the VDDQ output that supplies the VTT supply
required by DDR-I memory termination resistors. This regulator
sinks or sources up to 2A to or from the DDR-I bus termination
resistors, or 0.9A at 0.9V for the chipset in DDR-II, to support
both single- and dual-channel memory configurations. The VTT output
voltage accurately tracks VDDQ/2 to plus or minus 1%. The standby
LDO is powered from a standby voltage, VSTBY, of 3.3V or 5V, and
supplies a regulated output of up to 500mA to the VDDQ of the DDR
memory to enable it to retain its contents during the standby mode.
Different Parts for Greater Design Flexibility There are three
initial members of the CM3131 family. The CM3131-01 and CM3131-11
are both available in a PSOP-8 package. The primary difference
between these two parts is in the power sequencing control logic,
allowing system designers greater flexibility in their system
implementations. The CM3131-11 is optimized for applications where
the main input power rail is automatically powered down during the
transition to "suspend to RAM" sleep mode. The CM3131-11 autosenses
this transition, switching from the main VDDQ linear controller to
the standby LDO and also driving the output of the VTT regulator to
0.0V without the need for any additional control logic, simplifying
the design and further reducing cost. For systems where the main
power rail doesn't necessarily shut down during system sleep modes,
the CM3131-01 provides a select pin to explicitly control this
transition. The third member of the family, the CM3131-02, provides
both power sequencing options in a PSOP-14 package, and is designed
to drive two external unmatched N-FETs for improved thermal
characteristics in high-current designs. Key Features and Benefits
Features of the CM3131 family of all-linear voltage regulators
include: - Industry's first integrated three-in-one all-linear
voltage regulator for DDR with minimal external components - Up to
70% cost savings vs. other approaches - Up to 55% reduction in
board space, with 4 to 7 fewer major components (ICs, FETs,
inductors), as well as fewer resistors and capacitors - Integrated
power sequencing logic for simplified system design and better
power control - Over-current and over-temperature thermal shutdown
to prevent overheating - Excellent accuracy: VTT = VDDO/2 plus or
minus 1% load regulation - Small, 8 lead PSOP packages
(CM3131-01,-11); or 14 lead PSOP (CM3131-02). Pricing and
Availability The CM3131-01 and CM3131-11 are currently sampling
along with evaluation boards. The CM3131-02 will be sampling in
January 2004. The CM3131-01 and CM3131-11 are priced at US$0.73
each and the CM3131-02 is priced at US$0.82 each in 10,000 unit
quantities. Volume production is scheduled for Q1 CY2004. About
California Micro Devices Corporation California Micro Devices
Corporation is a leading supplier of application specific analog
semiconductor products for the computing, consumer electronics and
mobile markets. Key products include Application Specific
Integrated Passive (ASIP(TM)) devices and power management ICs.
Detailed corporate and product information may be accessed at
www.calmicro.com. NOTE: ASIP(TM) and Application Specific
Integrated Passive(TM) are trademarks of California Micro Devices.
All other trademarks are property of their respective owners.
Photo: NewsCom: http://www.newscom.com/cgi-bin/prnh/20031208/SFM067
AP Archive: http://photoarchive.ap.org PRN Photo Desk,
photodesk@prnewswire.com Web site: http://www.calmicro.com CONTACT:
Richard Haas of California Micro Devices, tel +1 408-934-3108, or
richardh@calmicro.com. /FCMN Contact: richardh@calmicro.com
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