California Micro Devices Expands Family of USB Overcurrent Protection Switches for PCs
November 11 2003 - 9:30AM
PR Newswire (US)
California Micro Devices Expands Family of USB Overcurrent
Protection Switches for PCs CM3511/12/13 Provide Advanced
Protection Features for up to 4 USB Ports in a Single 8-Pin Device
MILPITAS, Calif., Nov. 11 /PRNewswire-FirstCall/ -- California
Micro Devices today announced three new USB overcurrent protection
switches to support notebook and desktop personal computers,
expanding its existing portfolio of USB ESD (electrostatic
discharge) protection and power solutions. The CM3511/12/13 USB
overcurrent switches support four USB ports in a single device.
This allows next-generation PCs, which will have up to 8 ports per
desktop, or 3-4 USB ports per notebook, to reduce the number of
overcurrent protection devices per system by 50% vs. more
traditional 2-port devices. The CM3511, CM3512, and CM3513 offer
improved reliability and advanced features that are not available
with other low-cost solutions such as Positive Temperature
Coefficient (PTC) polymers, while providing comparable costs per
port. (Photo: http://www.newscom.com/cgi-bin/prnh/20031111/SFTU027
) Advanced Port Protection Features The CM3511 is optimized for
systems supporting "wake-on-USB" functionality, and is the
industry's first solution with different current limits when the
system is in full-power mode vs. standby mode. Two output channels
are offered, with each channel supporting up to 2 USB ports. It
provides 1.2A current limit per output channel in normal operating
mode and 200mA current limit per output in system standby mode.
This feature allows system designers to limit the amount of current
a USB peripheral can draw when the system is in sleep mode,
conserving power and preventing system crashes that can occur if a
USB peripheral tries to draw too much current from a standby power
rail. The CM3512 also provides two output channels with a 1.2A
current limit per channel. Separate ENABLE pins per channel allows
independent channel control for improved power management. The
CM3513 provides a single output channel and supports up to four
ports on that channel with 2.4A current limit, simplifying design
for customers that do not need the individual channel control of
the CM3512. All three switches have built-in backdrive protection,
preventing self-powered USB devices from driving current back into
the system, which can damage internal circuits when the system is
powered down. A 10 ms deglitch "fault blanking interval" prevents
false overcurrent alarms that could be caused during hot-insertion
events or during short spikes of current such as can occur during
initial spin-up of a USB hard drive. Advantages over PTC Solutions
PTC devices have been a popular alternative to semiconductor
overcurrent protection devices due to their low cost. The CM3511,
CM3512, and CM3513 are designed to be cost-competitive with PTC
implementations while overcoming their inherent limitations. PTCs,
due to their chemical composition, exhibit operating changes over
time and with temperature, and exhibit much slower response times
than semiconductor solutions such as the CM3511, CM3512, and
CM3513. Other features of the CM35XX family that are not available
in PTC solutions include inrush current limiting, fault blanking
protection, and current backdrive protection. "Our customers have
been searching for a solution with the advantages of semiconductor
solutions at prices that are competitive with PTC devices," stated
Joe Salvador, director of marketing for computing and consumer
products. "With the USB overcurrent switches we're announcing
today, they can build a cost-competitive solution without
sacrificing critical protection features." Key Features and
Benefits: Features of the CM3511/12/13 include: -- USB overcurrent
protection for up to 4 ports -- Dual outputs, each with independent
overcurrent protection circuits (CM3511, CM3512) -- Current limits
at 1.2A per output (CM3511, CM3512) and 2.4A per output (CM3513) --
Overcurrent Flag outputs with 10 ms deglitch "fault blanking
interval" to prevent false overcurrent alarms -- Built-in backdrive
protection -- Support standby mode in PCs for peripherals to wake
the system and limit the current to under 200mA per output (CM3511)
-- Small 8-lead SOIC package for space savings. Table of Product
Features USB Overcurrent Ports Current Over Current Switch
Supported Limit / Output Flag (OC) CM3511 4 1.2A/ 200mA Each Output
per 2 ports CM3512 CM3512 4 1.2A per 2 Each Output ports CM3513 4
2.4A per One for all 4 ports USB Output Fault Blank / Overcurrent
Control Backdrive Application Package Switch (EN/SEL) Protection
CM3511 Select between Desktop & SOIC-8 Normal / Yes / Yes
Notebook PC Standby Mode CM3512 Individual Yes / Yes Desktop &
SOIC-8 Output Notebook PC ENABLE CM3513 Device Yes / Yes Desktop
& SOIC-8 ENABLE Notebook PC Pricing and Availability Evaluation
boards and samples of the CM3511/12/13 devices will be available in
mid-November. The CM3511/12/13 ICs are priced at $0.75 in 10,000
units. Volume production is scheduled for January, 2004. About
California Micro Devices Corporation California Micro Devices
Corporation is a leading supplier of application specific analog
semiconductor products for the mobile, computing and consumer
electronics 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/20031111/SFTU027
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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