CM3121-02SH

更新时间： 2024-09-26 22:37:19

品牌	Logo	应用领域
CALMIRCO		稳压器双倍数据速率
页数	文件大小	规格书
11页	218K
描述
Dual Linear Voltage Regulator for DDR-I and DDR-II Memory

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数据手册

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CM3121-02SH 数据手册

PRELIMINARY

CM3121

Dual Linear Voltage Regulator for DDR-I and DDR-II Memory

Features

Product Description

The CM3121 provides an integrated power solution for

DDR-I and DDR-II memory systems in consumer electron-

ics applications. The CM3121 is ideal for a 2.8V to 3.6V

supply for DDR-I memory and 2.2V to 2.8V for DDR-II mem-

ory. The CM3121 features two independent linear regula-

•

Fully integrated power solution for DDR memory

ICs

•

Ideal for DDR-I (2.5V

Lowest system cost and smallest footprint with just

two external output capacitors

) and DDR-II (1.8V

)

DDQ

tors for V

and V

supply regulation. The default

DDQ

•

Two linear regulators:

voltage for V

is 2.5V. The V

regulator SENSE pin

- V

regulator with a maximum output current

DDQ

allows for setting V

in the 2.2V to 2.8V range, or DDR-II

of 1.5A shared by DRAM and V regulator

DDQ

memories from 1.7V to 1.9V. The V regulator output is

- source-sink V regulator with maximum out-

always half the V

voltage, derived internally. A capacitor

DDQ

put current of 0.5A (DDR-I) or 0.3A (DDR-II)

Fault output indicates overcurrent condition in

either regulator, under voltage lock-out and over-

temperature condition

Reverse current protection if host is powered off

PSOP-8 package with integrated heat spreader

Lead-free versions available

should be connected to each of the two outputs.

•

When EN_DDR is set high, the two DDR regulators are dis-

abled to minimize overall system power dissipation such as

when memory is in standby.

•

The FAULT pin goes low whenever either of the two regula-

tors goes into current limit mode, the input voltage drops too

far or if overtemp occurs.

Applications

The CM3121 is available in a PSOP-8 package that has

excellent thermal dissipation. It is available with optional

lead-free finishing.

•

DDR-I and DDR-II memory power for:

− Set Top Boxes, DVD Players, Games

− Digital TVs, Flat Panel Displays

− Printers, Digital Projectors

− Embedded systems

− Communications systems

Typical Application Circuit

Circuit Schematic

2.8V to 3.3V

V_DDQ

V_CC

REGULATOR

V_REF

V_DDQ

REGULATOR

V_DDQ

DDQ

V_REF

V_DDQ= 2.5V

DDQ

SENSE

V_DDQ

SENSE_ V

SENSE

DDQ

EN_DDR

DDQ

EN_DDR

Enable DDR

Memory #

DDR

MEMORY

V_TT

REGULATOR

V_TT

REGULATOR

V_TT

V_TT=1.25V

VTT

SENSE V_TT

SENSE V

SENSE_V

FAULT

CPU

CORE

+ I/O

CURRENT LIMIT

OVERTEMP

LOW INPUT

FAULT

CURRENT LIMIT

OVERTEMP

LOW INPUT

GND

11/12/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112

●

Tel: 408.263.3214

●

Fax: 408.263.7846

●

www.calmicro.com

12 3 4 5 6 7...11

中文翻译

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与CM3121-02SH相关器件

型号	品牌	获取价格	描述	数据表
CM313	CML	获取价格	T-3 1/4 Miniature Bayonet Base
CM3131	CALMIRCO	获取价格	Triple Linear Voltage Regulator for DDR-I/-II Memory
CM3131-01SB	CALMIRCO	获取价格	Triple Linear Voltage Regulator for DDR-I/-II Memory
CM3131-01SH	CALMIRCO	获取价格	Triple Linear Voltage Regulator for DDR-I/-II Memory
CM3131-02SB	CALMIRCO	获取价格	Triple Linear Voltage Regulator for DDR-I/-II Memory
CM3131-02SH	CALMIRCO	获取价格	Triple Linear Voltage Regulator for DDR-I/-II Memory
CM3131-11SB	CALMIRCO	获取价格	Triple Linear Voltage Regulator for DDR-I/-II Memory
CM3131-11SH	CALMIRCO	获取价格	Triple Linear Voltage Regulator for DDR-I/-II Memory
CM3132	CALMIRCO	获取价格	Triple Linear Voltage Regulator for DDR-I Memory and CPU
CM3132-02SB	CALMIRCO	获取价格	Triple Linear Voltage Regulator for DDR-I Memory and CPU

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