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PDF CM3131 Data sheet ( Hoja de datos )
| Número de pieza | CM3131 | |
| Descripción | Triple Linear Voltage Regulator | |
| Fabricantes | California Micro Devices | |
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CM3131
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
www.DataShee•t4U.cVoDmDQ 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
© 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
1
1 page  
Functional Description (cont’d)
www.DataSheet4U.com
S to R
S0
S1
S2
S3
S4
S5
VCC
3V/3.3V
3V/3.3V
3V/3.3V
<VCC MIN
<VCC MIN
<VCC MIN
VSTBY
5V/3.3V
5V/3.3V
5V/3.3V
5V/3.3V
5V/3.3V
5V/3.3V
EN
ON
ON
ON
ON
OFF
OFF
VDDQ OUT VTT OUT
VDDQ
VDDQ / 2
VDDQ
VDDQ / 2
VDDQ
VDDQ / 2
VDDQ STBY
0V
0V 0V
0V 0V
Sequencing Matrix for CM3131-11 for Suspend to RAM operation
CM3131
VCC
VSTBY
SEL
3V/3.3V 5V/3.3V ON
<VCC MIN 5V/3.3V OFF
X <VSTBY MIN OFF
0V X ON
<VCC MIN
X
X
EN
ON
ON
ON
ON
OFF
VDDQ OUT VTT OUT
VDDQ VDDQ / 2
VDDQ STBY
0V
0V 0V
0V 0V
0V 0V
Truth Table for CM3131-02
Table 3
S0
S1
S2
S3
S4
S5
VCC
VSTBY
SEL
3V/3.3V 5V/3.3V ON
3V/3.3V 5V/3.3V ON
3V/3.3V 5V/3.3V ON
<VCC MIN 5V/3.3V OFF
<VCC MIN
X
ON
<VCC MIN
X
ON
EN
ON
ON
ON
ON
OFF
OFF
VDDQ OUT VTT OUT
VDDQ VDDQ / 2
VDDQ VDDQ / 2
VDDQ VDDQ / 2
VDDQ STBY
0V
0V 0V
0V 0V
Sequencing Matrix for CM3131-02 for Suspend to RAM operation
© 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
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet CM3131.PDF ] | |
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