CM3205 Ver la hoja de datos (PDF) - California Micro Devices Corp

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componentes Descripción

Fabricante

CM3205

DDR VDDQ and Termination Voltage Regulator

California Micro Devices Corp 

Typical Operating Characteristics

VDDQ Transient Response

PRELIMINARY

CM3205

VTT Transient Response

VDDQ

VTT

IOUT

VIN = 3.3V

IOUT Step: 10mA ~ 3A

IOUT

VIN = 3.3V

IOUT Step: -2.5A ~ +2.5A

Pin Descriptions

PIN(S)

1

2

3

4

5

NAME

PIN DESCRIPTIONS

DESCRIPTION

This pin is for VDDQ output voltage adjustment. The VDDQ output voltage is set using an

external resistor divider connected to ADJSD. The output voltage is determined by the

following formula:

VDDQ

=

1.215V × R-----1----+-----R-----2-

R1

ADJSD

VDDQ

GND

VIN

VTT

where R1 is the ground-side resistor and R2 is the upper resistor of the divider.

Connect these resistors to the VDDQ output at the point of regulation.

In addition, this input functions as a shutdown pin. Apply a voltage higher than VIN-1.2V

to this pin to simultaneously shutdown both VDDQ and VTT outputs. The outputs are

restored when the voltage on this pin falls below VIN-1.2V. A low-leakage diode in

series with the shutdown input signal is recommended to avoid interference with the

voltage adjustment setting.

VDDQ regulator output voltage pin.

GROUND reference pin. The back tab is also ground and serves as the package

heatsink. It should be soldered to the circuit board copper to remove excess heat from

the IC.

Input voltage pin, typically 3.3V from the power supply.

VTT regulator output voltage pin, which is preset to 50% of VDDQ.

© 2006 California Micro Devices Corp. All rights reserved.

05/08/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com

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