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CM3131 Datasheet(PDF) 1 Page - California Micro Devices Corp

Part # CM3131
Description  Triple Linear Voltage Regulator for DDR-I/-II Memory
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Manufacturer  CALMIRCO [California Micro Devices Corp]
Direct Link  http://www.calmicro.com
Logo CALMIRCO - California Micro Devices Corp

CM3131 Datasheet(HTML) 1 Page - California Micro Devices Corp

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© 2004 California Micro Devices Corp. All rights reserved.
02/02/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
CM3131
1
Triple Linear Voltage Regulator for DDR-I/-II Memory
Features
Integrated power solution for DDR-I and DDR-II
memory systems with few external components
Three all-linear regulators for VDDQ, VTT and
VSTBY power supply applications
Lowest system cost and smallest footprint for
DDR power solutions
VDDQ regulator/driver utilizes external N-FET to
provide up to 15A current at 2.5V/1.8V
VTT source/sink regulator provides up to 2A at
1.25V for DDR-I systems or 0.65A at 0.9V for
the DDR-II memory controller (not DDR-II
memory)
LDO standby regulator provides up to 500mA at
2.5V for DDR-I and at 1.8V for DDR-II systems
Can be ganged for higher current applications
Over temperature and reverse current protection
Over current protection for VSTBY and VTT
regulator
Available in 8 lead and 14 lead PSOP packages
Lead-free versions available
Applications
Desktop PCs, notebooks, and workstations
Set top boxes, digital TVs, printers
Embedded systems
Product Description
The CM3131 family of all-linear regulators provides
an integrated power solution for DDR-I/-II memory
systems in both run-time and standby modes of
operation.
The
CM3131
is
ideal
for
designs
incorporating both a main 3.3V and a standby (3.3V
or
5V)
supply.
The
CM3131
features
three
independent linear regulators for VDDQ, VTT and VSTBY
supply regulation and will maintain an accuracy of
±1% across the operating temperature range.
The CM3131 is offered in two configurations. The
CM3131-01/11 drives a single external N-FET on a
single VDDQ rail. The CM3131-02 drives two external
unmatched N-FETs on two VDDQ rails. Each VDDQ rail
incorporates an adjustment pin (SENSE) to enable
setting VDDQ in the 2.2V to 2.8V range, supporting
DIMMs with different supply requirements or DDR-II
type devices.
The CM3131-01/11 is available in 8-lead PSOP
package and the CM3131-02 is available in 14-lead
PSOP package.
The CM3131 devices are also available with optional
lead-free finishing.
Electrical Schematic


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