AIC1383
1.5A Termination Regulator
FEATURES
1.5A Source and Sink Current Ability
Support DDR1 (1.25V
TT
) and DDR2 (0.9V
TT
)
Requirements
Low Output Voltage Offset,
±20mV
High Accuracy Output Voltage at Full-Load
Adjustable V
OUT
by External Resistor
Low External Component Count
Current Limit protection
Thermal Protection
SOP-8 Package
DESCRIPTION
AIC1383 linear regulator is designed to achieve
1.5A source and sink current while regulating
an output voltage to within 25mV.
AIC1383 converts voltage supplies range from
1.6V to 6V into an output voltage that adjusts by
two external voltage divider resistors. It
provides an excellent voltage source for active
termination
schemes
of
high-speed
transmission lines as those seen in high-speed
memory buses, and it meets the JEDEC SSTL-
2 and SSTL-3 specifications for termination of
DDR-SRAM.
Built-in current limiting in source and sink mode,
with thermal shutdown provide maximal
protection to the AIC1383 against fault
conditions.
APPLICATIONS
Mother Board
Graphic Cards
DDR Termination Voltage Supply
TYPICAL APPLICATION CIRCUIT
1
+
R
1
100K
2
3
EN
CES7002A
C1
R2
100pF 100K
V
OUT
=1.25V
+
4
8
V
IN
=2.5
V
C
IN
470µF
VIN
GND
VREF
VOUT
VCNTL
VCNTL
VCNTL
VCNTL
+
7
6
5
C
CNTL
47µF
V
CNTL
=3.3
V
C
OUT
220µF
AIC1383
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-1383P-02 010405
1
AIC1383
ORDERING INFORMATION
AIC1383XXXX
PACKING TYPE
TR: TAPE & REEL
PACKAGE TYPE
S: SOP-8
C: COMMERCIAL
P: LEAD FREE COMMERCIAL
Example:
AIC1383CSTR
1.5A Version, in SOP-8 Package, Tape &
Reel Packing Type
AIC1383PSTR
1.5A Version, in Lead Free SOP-8
Package, Tape & Reel Packing Type
VIN 1
GND 2
VREF 3
VOUT 4
8
7
6
5
VCNTL
VCNTL
VCNTL
VCNTL
PIN CONFIGURATION
SOP-8
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
Operating Temperature Range
Junction Temperature Range
Storage Temperature Range
Lead Temperature (Solder, 10sec)
Thermal Resistance
θ
JC
Thermal Resistance
θ
JA
SO-8
SO-8
-0.4V to 7V
-40°C~85°C
125°C
-65°C ~150°C
260°C
40°C /W
160°C /W
(Assume no ambient airflow, no heatsink)
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
2.5V/
1.8V
1
VIN
VCNTL
VCNTL
VCNTL
VCNTL
8
7
6
5
3.3V
2 GND
3 VREF
4 VOUT
1.25V
/0.9V
V
OUT
+
C
OUT
10µF
AIC1383
2
AIC1383
ELECTRICAL CHARACTERISTICS
(V
CNTL
=3.3V, V
IN
=2.5V, V
REF
=0.5V
IN
,
C
OUT
=10µF, T
A
=25°C, unless otherwise specified) (Note 1)
PARAMETER
Input Voltage (DDR1/2)
Output Voltage
Output Voltage Offset
Load Regulation (DDR1/2)
Quiescent Current
TEST CONDITIONS
Keep operate V
CNTL
≥V
IN
at
power on and off sequences
I
OUT
= 0mA
I
OUT
= 0mA
I
OUT
=0.1mA ~ +1.5A
I
OUT
= 0.1mA ~ -1.5A
V
REF
<0.2V, V
OUT
= OFF
SYMBOL
V
IN
V
CNTL
V
OUT
V
OS
∆V
LOR
I
Q
I
CNTL
-20
10
10
8
3
MIN.
1.6
3.0
TYP.
2.5/1.8
3.3
V
REF
20
25
25
30
10
1
I
IL
2.1
3
4.5
6
MAX.
UNIT
V
V
mV
mV
µA
mA
µA
A
Operating Current of V
CNTL
No load
V
REF
Bias Current
Current Limit
THERMAL PROTECTION
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
3.3V≤V
CNTL
≤5V
Guaranteed by design
V
REF
=1.25V
T
SD
125
150
30
°C
°C
SHUTDOWN SPECIFICATIONS
Shutdown Threshold
Output ON (V
REF
=0V 1.25V)
Output OFF (V
REF
=1.25V 0V)
0.8
0.2
V
Note 1
:
Specifications are production tested at T
A
=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
Note 2:
V
OS
is the voltage measurement, which is defined as V
OUT
subtracted V
REF.
Note 3:
Load regulation is measured at constant junction temperature, using pulse testing with a low ON time.
Note 4:
Current limit is measured by pulsing a short time.
Note 5:
For operate system safely; V
CNTL
must be always greater than V
IN
.
3
AIC1383
TYPICAL PERFORMANCE CHARACTERISTICS
0.55
0.55
V
CNTL
=3.3V
Threshold Voltage (V)
Threshold Voltage (V)
0.50
V
CNTL
=5V
0.50
V
IN
=2.5V
V
IN
=2.5V
0.45
0.45
0.40
0.40
0.35
0.35
0.30
-40
-20
0
Temperature (°C)
20
40
60
80
100
120
0.30
-40
-20
0
20
40
60
80
100
120
Fig. 1 Turn-On Threshold vs. Temp.
Temperature (°C)
Fig. 2 Turn-On Threshold vs. Temp
3.0
2.5
V
CNTL
=3.3V, V
IN
=2.5V
V
CNTL
=3.3V
V
OUT
=1.25V
5
Output Voltage Offset (mV)
2.0
Sourcing Current (A)
V
IN
=2.5V
V
REF
=1.25V
No Load
4
3
1.5
2
1.0
V
CNTL
=3.3V
1
0.5
V
IN
=2.5V
V
OUT
=1.25V
0.0
-40
-20
0
20
40
o
60
80
100
120
0
-40
-20
0
20
40
60
80
100
120
Temperature( C)
Fig. 3 Output Voltage Offset vs. Temperature
Temperature (°C)
Fig. 4 Current-Limit (Sourcing) vs. Temperature
5
4
Sinking Current (A)
V
CNTL
=3.3V
V
IN
=2.5V
V
OUT
=1.25V
3
2
1
0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Fig. 5 Current-Limit (Sinking) vs. Temperature
4
AIC1383
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
=2.5V
V
CNTL
=3.3V
V
REF
=1.25V
V
IN
=2.5V
V
CNTL
=3.3V
V
REF
=1.25V
(Continued)
I
OUT
: 1A/DIV
I
OUT
: 1A/DIV
Fig. 6
Output Short-Circuit (Sinking)
Fig. 7 Output Short-Circuit Protection (Sourcing)
V
OUT
: 50mV/DIV
V
IN
=2.5V
V
CNTL
=3.3V
V
REF
=1.25V
V
OUT
: 50mV/DIV
V
IN
=1.8V
V
CNTL
=3.3V
V
REF
=0.9V
I
OUT
: 1A/DIV
I
OUT
: 1A/DIV
Fig. 8 Transient Response at 1.25V
TT
/1.5A
Fig. 9 Transient Response at 0.9V
TT
/1.5A
BLOCK DIAGRAM
VCNTL
VIN
+
Control
VREF
VOUT
-
Current
Limit
Thermal
Shutdown
VOUT
Shutdown
GND
5
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