LP2998EVAL National Semiconductor, LP2998EVAL Datasheet - Page 13

• Manufacturer Part Number: LP2998EVAL
• Description: BOARD EVALUATION FOR LP2998
• Manufacturer: National Semiconductor

Specifications of LP2998EVAL

• Channels Per Ic: 1 - Single
• Current - Output: 1.5A
• Voltage - Input: 2.2 ~ 5.5V
• Regulator Type: Positive Fixed
• Operating Temperature: -40°C ~ 125°C
• Board Type: Fully Populated
• Utilized Ic / Part: LP2998
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -

DDR-II APPLICATIONS
With the separate VDDQ pin and an internal resistor divider
it is possible to use the LP2998 in applications utilizing DDR-
II memory.
tions of recommended circuits with output curves displayed
If it is not desirable to use the 1.8V rail it is possible to connect
the output stage to a 3.3V rail. Care should be taken to not
exceed the maximum operating junction temperature as the
thermal dissipation increases with lower V
Figure 6
and
Figure 7
FIGURE 5. SSTL-2 Implementation With Higher Voltage Rails
show several implementa-
FIGURE 7. DDR-II Termination With Higher Voltage Rails
FIGURE 6. Recommended DDR-II Termination
TT
output voltages.
13
in the Typical Performance Characteristics.
the recommended circuit configuration for DDR-II applica-
tions. The output stage is connected to the 1.8V rail and the
AVIN pin can be connected to either a 2.5, 3.3V or 5.5V rail.
For this reason it is not recommended to power PVIN with a
rail higher than the nominal 3.3V. The advantage of this con-
figuration is that it has the ability to source and sink a higher
maximum continuous current.
30026913
30026912
30026914
Figure 6
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