CM3121-02SH datasheet(6/11 Pages) CALMIRCO

Part #	CM3121-02SH

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

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Manufacturer	CALMIRCO [California Micro Devices Corp]

Direct Link	http://www.calmicro.com

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430 N. McCarthy Blvd., Milpitas, CA 95035-5112

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Tel: 408.263.3214

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Fax: 408.263.7846

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www.calmicro.com

11/12/04

CM3121

PRELIMINARY

Note 3: All parameters specified at TA = -40°C to +85°C unless otherwise noted.

Note 4: Note that the IDDQ current specified is the load current output from the VDDQ pin. VDDQ also supplies current internally to the

VTT regulator when it is sourcing current. The maximum source current can be up to 0.5A. So the maximum total current

from the VDDQ regulator is the external VDDQ current IDDQ added to the maximum VTT sourcing current ITT. All load currents

are specified as such, but the VDDQ current limit is specified at a current just above the total maximum current.

Table 1: Truth Table for CM3121

VDDQ Regulator Parameters

VCC MIN

Input Voltage

VDDQ = 2.5V, IDDQ = 1.5A,

SENSE_VDDQ = 0V, Note 4

2.2

V

VDDQ

Default Output Voltage Range

IDDQ = 0.01A,VCC = 3.3V,

SENSE_VDDQ = 0V, Note 4

1.75

1.80

1.85

V

VDDQ ADJ

Adjustable Output Voltage

Range

VCC = 3.3V, SENSE_VDDQ tied to

external resistors R1 and R2, Note 4

1.6

2.8

V

VDDQ LD

Load Regulation

TA = 25°C, VCC = 2.5V,

0.01A

≤ IDDQ ≤ 1.0A, Note 4

--

2.5

%

VDDQ LINE Line Regulation

TA = 25°C, IDDQ = 0.01A,

2.2V

≤ VCC ≤ 2.8V, Note 4

-1.0

-

1.0

%

eN DDQ

Output Noise Voltage

BW = 10Hz - 100kHz, CDDQ = 10µF49

µ

Vrms

IDDQ LIM

Current Limit

Note 4

1.7

2.0

A

IDDQ SC

Short Circuit Current

VDDQ < 0.3V

0.5

A

VTT Regulator Parameters

VTT

Output Voltage Range

VDDQ = 1.8V, ITT = 0.01A,

0.86

0.90

0.94

V

VTT LD

Load Regulation

TA = 25°C, VDDQ = 1.8V,

0.01A

≤ ITT ≤ ±0.3A

-1.0

-

1.0

%

VTT LINE

Line Regulation

TA = 25°C, ITT = 0A,

2.2V

≤ VCC ≤ 2.8V

-1.0

-

1.0

%

eN TT

Output Noise Voltage

BW = 10Hz - 100kHz, CTT = 10µF51

µ

Vrms

ITT LIM

Current Limit

0.4

0.6

A

ITT SC

Short Circuit Current

VTT < 0.3V

0.3

A

VCC(1)

EN_DDR

VDDQ OUT

VTT OUT

2.8V to 3.6V

Low

VDDQ

VDDQ / 2

X

High

0V

ELECTRICAL OPERATING CHARACTERISTICS (CONT’D) (SEE NOTE 3)

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