FAN1655MX datasheet(1/9 Pages) FAIRCHILD

Part #	FAN1655MX

Description	3A DDR Bus Termination Regulator

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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REV. 1.1.4 3/24/04

Features

• Sinks and sources 2.1A continuous, 3A peak

•0 to +125°C operating temperature range

• 5mA Buffered VREFOUT = VDDQ/2

• Load regulation: VTT = VREFOUT ± 40mV

• On-chip thermal limiting

•Low Cost SO-14, Power-Enhanced eTSSOP or

8-pin 5x6mm MLP packages

•Low-Current Shutdown Mode

• Output Short Circuit Protection

Applications

• DDR Terminator VTT supply

Description

The FAN1655 is a low-cost bi-directional LDO speciﬁcally

designed for terminating DDR memory bus. It can both sink

and source up to 2.1A continuous, 3A peak, providing

enough current for most DDR applications. Load regulation

meets the JEDEC spec, VTT = VREFOUT ± 40mV.

The FAN1655 includes a buffered reference voltage capable

of supplying up to 5mA current. On-chip thermal limiting

provides protection against a combination of power overload

and ambient temperature that would create an excessive

junction temperature. A shutdown input puts the FAN1655

into a low power mode.

The FAN1655 regulator is available in a power-enhanced

eTSSOP™-16, standard SOIC-14, and an 8-Lead MLP

package.

Block Diagram

VSS

+

-

VTTSENSE

VTTFORCE

+

-

VDD

SHDN

VDDQ

200k

FAN1655

VSSQ

VREFIN

VREFOUT

FAN1655

3A DDR Bus Termination Regulator

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