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AIC1383 Schematic ( PDF Datasheet ) - Analog Intergrations Corporation

Teilenummer AIC1383
Beschreibung 1.5A Termination Regulator
Hersteller Analog Intergrations Corporation
Logo Analog Intergrations Corporation Logo 




Gesamt 7 Seiten
AIC1383 Datasheet, Funktion
AIC1383
1.5A Termination Regulator
FEATURES
1.5A Source and Sink Current Ability
Support DDR1 (1.25VTT) and DDR2 (0.9VTT)
Requirements
Low Output Voltage Offset, ±20mV
High Accuracy Output Voltage at Full-Load
Adjustable VOUT by External Resistor
Low External Component Count
Current Limit protection
Thermal Protection
SOP-8 Package
APPLICATIONS
Mother Board
Graphic Cards
DDR Termination Voltage Supply
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.
TYPICAL APPLICATION CIRCUIT
VIN=2.5V
CIN
470µF
+
R1
100K
1 VIN
2 GND
8
VCNTL
7
VCNTL
EN
CES7002A
C1 R2
100pF 100K
3 VREF
6
VCNTL
VOUT=1.25V 4 VOUT
5
VCNTL
+ COUT
AIC1383
220µF
VCNTL=3.3V
+
CCNTL
47µF
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 Datasheet, Funktion
AIC1383
PIN DESCRIPTIONS
PIN 1:
PIN 2:
PIN 3:
VIN
GND
VREF
- Input supply pin. It provides
main power to create the
external reference voltage by
divider resistors for regulating
VREF and VOUT.
- Ground pin.
- Reference voltage input. Pull
this pin low to shutdown device.
APPLICATION INFORMATION
Layout Consideration
AIC1383 is in SOP-8 package resulting in unable
to dissipate heat easily when it operates in high
current. In order to prevent maximum junction
temperature exceeded, the suitable copper area
has to use.
PIN 4: VOUT - Output pin.
PIN 5~8: VCNTL - Input supply pin. It is used to
supply all the internal control
circuitry.
The large copper at VCNTL pins is available, and
the heat dissipation is relieved. Using via to lead
heat into the bottom layer to strengthen as below
figures show.
All capacitors should be placed as close as
possible to relative pins.
Fig. 10. Top layer
Fig. 11. Bottom layer
Fig. 12. Placement
6

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