AIC1383B
3A Termination Regulator
FEATURES
3A 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, TO-252 and TO-263 Packages
DESCRIPTION
AIC1383B linear regulator is designed to
achieve 3A source and sink current while
regulating an output voltage to within 45mV.
AIC1383B 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 AIC1383B against
fault conditions.
APPLICATIONS
Mother Board
Graphic Cards
DDR Termination Voltage Supply
TYPICAL APPLICATION CIRCUIT
V
IN
=2.5V
+
C
IN
470µF
1
2
3
VIN
VOUT
GND
VCNTL
VREF
5
R1
100K
C1
100pF
C
OUT
220µF
R2
100K
+
V
OUT
4
V
CNTL
=3.3V
+
C
CNTL
47µF
AIC1383B
EN
CES7002A
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-1383BP-03 010405
1
AIC1383B
ORDERING INFORMATION
AIC1383BXXX XX
PACKING TYPE
TR: TAPE & REEL
PACKAGE TYPE
M5: TO-263-5
E5: TO-252-5
S: SOP-8
C: COMMERCIAL
P: LEAD FREE COMMERCIAL
Example:
AIC1383BCE5TR
3A Version, in TO-252-5 Package,
Tape & Reel Packing Type
AIC1383BPE5TR
3A Version, in Lead Free TO-252-5
Package, Tape & Reel Packing
PIN CONFIGURATION
TO-263-5
FRONT VIEW
1: VIN
2: GND
3. VCNTL
4. VREF
5: VOUT
TO-252-5
TOP VIEW
1: VIN
2: GND
3. VCNTL
4. VREF
5: VOUT
12345
1234 5
SOP-8
TOP VIEW
VIN 1
GND 2
VREF 3
VOUT 4
8 VCNTL
7 VCNTL
6 VCNTL
5 VCNTL
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Lead Temperature (Solder, 10sec)
Thermal Resistance
θ
JC
TO-263
TO-252
SO-8
Thermal Resistance
θ
JA
(Assume no ambient airflow, no heatsink)
TO-263
TO-252
SO-8
-0.4V to 7V
-40°C~85°C
125°C
-65°C ~150°C
260°C
3°C /W
12.5°C /W
40°C /W
60°C /W
100°C /W
160°C /W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
2
AIC1383B
TEST CIRCUIT
2.5
V
1
2
3
VIN
GND
VREF
VCNTL
AIC1383
B
4
VOUT
5
V
OUT
+
1.
25V
C
OUT
10µF
3.3
V
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)
(Note2)
Output Voltage
Output Voltage Offset
TEST CONDITIONS
Keep operate V
CNTL
≥V
IN
at
power on and off sequences
I
OUT
= 0mA
I
OUT
= 0mA
SYMBOL
V
IN
V
CNTL
V
OUT
V
OS
∆V
LOR
I
Q
I
CNTL
0
I
IL
3.2
4
-20
35
35
8
3
MIN.
1.6
3.0
TYP.
2.5
3.3
V
REF
20
45
45
30
10
1
6.5
MAX.
6
6
UNIT
V
V
mV
mV
µA
mA
µA
A
Load Regulation (DDR1/2) I
OUT
=0.1mA ~ +3A
(Note2)
Quiescent Current
I
OUT
=0.1mA ~ -3A
V
REF
<0.2V, V
OUT
= OFF
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: DDR2 is not available for TO-263 package.
Note 3: V
OS
is the voltage measurement, which is defined as V
OUT
subtracted V
REF.
Note 4: Load regulation is measured at constant junction temperature, using pulse testing with a low ON time.
Note 5: Current limit is measured by pulsing a short time.
Note 6: For operate system safely; V
CNTL
must be always greater than V
IN
.
3
AIC1383B
TYPICAL PERFORMANCE CHARACTERISTICS
0.52
Threshold Voltage (V)
0.48
0.44
0.40
0.36
0.32
V
IN
=2.5V
Threshold Voltage (V)
V
CNTL
=3.3V
0.52
0.48
0.44
0.40
0.36
0.32
V
CNTL
=5V
V
IN
=2.5V
-20
0
Temperature
(
°C)
20
40
60
80
100
120
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.
6
Output Voltage Offset (mV)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-40
Sourcing Current (A)
V
CNTL
=3.3V
V
IN
=2.5V
V
REF
=1.25V
No Load
5
V
CNTL
=3.3V
V
IN
=2.5V
V
REF
=1.25V
4
3
-20
0
20
40
60
80
100
120
2
-40
-20
0
20
40
60
80
100
120
Temperature (
°C)
Fig. 3 Output Voltage Offset vs. Temp.
Temperature (
°C)
Fig. 4 Current-Limit (Sourcing) vs. Temp.
6
Sinking Current (A)
5
V
CNTL
=3.3V
V
IN
=2.5V
V
REF
=1.25V
V
CNTL
=3.3V
V
IN
=2.5V, V
REF
=1.25V
V
OUT
, 50mV/div
I
OUT
,
2A/div
4
3
2
-40
-20
0
20
40
60
80
100
120
Temperature (
°C)
Fig. 5 Current-Limit (Sinking) vs. Temp.
Fig. 6 Transient Response at 1.25V
TT
/3A
4
AIC1383B
TYPICAL PERFORMANCE CHARACTERISTICS
V
CNTL
=3.3V
V
IN
=2.5V
V
REF
=1.25V
V
CNTL
=3.3V
V
IN
=2.5V
V
REF
=1.25V
(Continued)
Iout, 2A/div
Iout, 2A/div
Fig. 7 Output Short-Circuit Protection (Sinking)
Fig. 8 Output Short-Circuit Protection (Sourcing)
BLOCK DIAGRAM
VCNTL
VIN
+
Control
VREF
VOUT
-
Current
Limit
Thermal
Shutdown
VOUT
Shutdown
GND
5
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