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 CM3131 Family Delivers Lowest Cost and
Smallest Footprint Solution for PCs and Set-Top Boxes MILPITAS,
Calif., Dec. 8 /PRNewswire-FirstCall/ -- California Micro Devices ,
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 percent and a 55 percent 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 $0.73 each
and the CM3131-02 is priced at $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
http://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.
http://www.newscom.com/cgi-bin/prnh/20031208/SFM067
http://photoarchive.ap.org/ DATASOURCE: California Micro Devices
CONTACT: Richard Haas of California Micro Devices, +1-408-934-3108,
or Web site: http://www.calmicro.com/
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