LP3990MF-2.8/NOPB National Semiconductor, LP3990MF-2.8/NOPB Datasheet - Page 11

• Manufacturer Part Number: LP3990MF-2.8/NOPB
• Description: IC REG LDO 150MA 2.8V SOT23-5
• Manufacturer: National Semiconductor

Specifications of LP3990MF-2.8/NOPB

• Regulator Topology: Positive Fixed
• Voltage - Output: 2.8V
• Voltage - Input: Up to 6V
• Voltage - Dropout (typical): 0.12V @ 150mA
• Number Of Regulators: 1
• Current - Output: 150mA (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Other names: *LP3990MF-2.8; LP3990MF-2.8; LP3990MF-2.8NOPB; LP3990MF-2.8NOPBTR; LP3990MF-2.8NOPBTR; LP3990MF-2.8TR

costly) than a ceramic capacitor with the same ESR value. It
should also be noted that the ESR of a typical tantalum will
increase about 2:1 as the temperature goes from 25°C down
to -40°C, so some guard band must be allowed.
ENABLE CONTROL
The LP3990 features an active high Enable pin, V
turns the device on when pulled high. When not enabled the
regulator output is off and the device typically consumes 2nA.
If the application does not require the Enable switching fea-
ture, the V
output permanently on.
To ensure proper operation, the signal source used to drive
the V
specified turn-on/off voltage thresholds listed in the Electrical
Characteristics section under V
Micro SMD MOUNTING
The micro SMD package requires specific mounting tech-
niques, which are detailed in National Semiconductor Appli-
cation Note AN-1112.
EN
input must be able to swing above and below the
EN
pin should be tied to V
IL
and V
IN
to keep the regulator
IH
.
EN
, which
11
For best results during assembly, alignment ordinals on the
PC board may be used to facilitate placement of the micro
SMD device.
Micro SMD LIGHT SENSITIVITY
Exposing the micro SMD device to direct light may affect the
operation of the device. Light sources, such as halogen
lamps, can affect electrical performance, if placed in close
proximity to the device.
Light with wavelengths in the infra-red portion of the spectrum
is the most detrimental, and so, fluorescent lighting used in-
side most buildings, has little or no effect on performance.
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