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Evaluation board available.
NEXSEM
3A SOURCE/SINK TERMINATION REGULATOR
DESCRIPTION
NX1730 is a 3A source and sink Low Dropout Regulator
designed for DDRI and DDRII termination application.
Current limit circuitry in both sink and source side plus
internal thermal shutdown protects the device under short
circuit condition . NX1730 can be disabled by pulling
down the Reference Pin below 0.2V using external small
signal transistor or a MOSFET.
The NX1730 can also be used as an adjustable output
voltage regulator using an external reference.
NX1730 is available in TO-252 package for low cost yet
excellent thermal capability.
NX1730
PRELIMINARY DATA SHEET
Pb Free Product
FEATURES
n Independent power sequencing
n Support DDR I (1.25V VTT) and DDRII (0.9V VTT)
n 3A Source and Sink current capability
n Shut down by pulling REFEN pin low
n Current Limit
n Thermal Shut down
n TO-252 package
n Pb-free and RoHS compliant
APPLICATIONS
n DDR Memory Termination Supply
n Desktop Motherboard or Notebook applications
n Graphic Card
n Set Top Box
n Active Terminal Bus Termination
VCNTL
+3.3V
EN
2N7002
C1
0.1uF
CCNTL
1uF
VCNTL
R1
100k
R2
100k
Figure1 - Typical application of NX1730
REFEN
NX1730
VOUT
GND
TYPICAL APPLICATION
VIN
+2.5V
VOUT
+1.25V
VIN
CIN
100uF
Co
100uF
R3
1k
ORDERING INFORMATION
Rev. 2.0
12/19/05
Device Temperature Package Pb-Free
NX1730CDTR 0 to 70oC TO-252-5L Yes
NX1730CMTR 0 to 70oC MLPD-8L Yes
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NEXSEM
θ≈47/
CW
θ≈45/
CW
PARAMETER
SYM
Test Condition
Min
TYP
MAX
Units
OS
Load Regulation
2A
CNTL
SHDNVREFEN
Short Circuit Protection
Protection
Temperature
Temperature
Shutdown Function
Output=Low
0.2
ABSOLUTE MAXIMUM RATINGS(NOTE1)
Input Voltage ................................................. 6.5V
Power Dissipation @ 25oC
TO_252/MLPD_8L ........................................... 1.471W
ESD Susceptibility .......................................... 2kV
Lead Temperature(Soldering,10sec.) ................. 260oC
Storage Temperature Range ............................. -65oC to 150oC
Operating Junction Temperature Range ............. -40oC to 125oC
PACKAGE INFORMATION
5-LEAD PLASTIC TO_252 8-LEAD PLASTIC MLPD
NX1730
o
JA
NX1730
(NOTE2)
5
VOUT
4
REFEN
3
VCNTL(TAB)
2
GND
1
VIN
NC
VIN
NC
VCNTL
1
2
3
4
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over VIN=2.5V, V
and TA = 25oC.
Output Offset Voltage
Input Voltage Range(DDRI/II)
Operating Current of VCNTL
Current In Shutdown Mode I
V
delta_V
V
IN
V
CNTL
I
IOUT=0A -20 0 20 mV
IL:From 0A to
LOAD
IL:From 0A to -2A
Keep V
CNTL
>=VIN on
operation power on and
power off sequences
No Load 0.5 mA
<0.2V,RL=180ohm 90 µA
JA
CNTL
o
PAD
(Gnd)
=3.3V,V
(NOTE3)
8
NC
7
VOUT
6
VSENSE
REFEN
5
REFEN
=1.25V,C
=10uF(ceramic),
OUT
-20 0 20 mV
1.7 2.5/1.8
3 3.3/5 6
V
Current Limit
Over Temperature
Thermal Shutdown
Thermal Shutdown
Rev. 2.0
12/19/05
I
LIMIT
T
SD
delta_T
SD
3.3V<=V
3.3V<=V
<=5V 150 °C
CNTL
<=5V 35 °C
CNTL
Ouput=High 0.6
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3.1 4
A
VShutdown Threshold Trigger
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NEXSEM
Symbol
Pin Description
NX1730
PIN DESCRIPTIONS
VIN Regulator's power supply voltage.
GND Ground.
REFEN Reference voltage input and Regulator's enable.
VOUT Output voltage.
VCNTL Gate drive voltage.
NOTE1: Stresses above those listed in "ABSOLUTE MAXIMUM RATINGS", may cause permanent damage to
the device. This is a stress only rating and operation of the device at these or any other conditions above those
indicated in the operational sections of this specification is not implied.
NOTE2: Mounted on a 1" square copper.
NOTE3: PAD is GND.
Rev. 2.0
12/19/05
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