LM2984T National Semiconductor, LM2984T Datasheet - Page 11

• Manufacturer Part Number: LM2984T
• Description: IC,VOLT REGULATOR,FIXED,+5V,BIPOLAR,ZIP,11PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LM2984T

• Rohs Compliant: NO

Typical Performance Characteristics
Ripple Rejection (V
Output Voltage
Output Capacitor ESR
(Standby Output, Pin 9)
Application Hints
OUTPUT CAPACITORS
The LM2984 output capacitors are required for stability.
Without them, the regulator outputs will oscillate, sometimes
by many volts. Though the 10 µF shown are the minimum
recommended values, actual size and type may vary de-
pending upon the application load and temperature range.
Capacitor effective series resistance (ESR) also affects the
IC stability. Since ESR varies from one brand to the next,
some bench work may be required to determine the mini-
OUT
)
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DS011252-49
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Ripple Rejection (V
Output Capacitor ESR
(Buffer Output, Pin 10)
Device Dissipation vs
Ambient Temperature
11
(Continued)
buf
mum capacitor value to use in production. Worst case is usu-
ally determined at the minimum ambient temperature and
the maximum load expected.
Output capacitors can be increased in size to any desired
value above the minimum. One possible purpose of this
would be to maintain the output voltages during brief condi-
tions of negative input transients that might be characteristic
of a particular system.
Capacitors must also be rated at all ambient temperatures
expected in the system. Many aluminum type electrolytics
will freeze at temperatures less than −30˚C, reducing their
)
DS011252-11
DS011252-50
Ripple Rejection (V
Output Capacitor ESR
(Main Output, Pin 11)
DS011252-9
stby
)
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DS011252-12
DS011252-51