LM2925T National Semiconductor, LM2925T Datasheet - Page 6

• Manufacturer Part Number: LM2925T
• Description: IC REG LDO W/DELAY RESET TO220-5
• Manufacturer: National Semiconductor

Specifications of LM2925T

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: Up to 26V
• Voltage - Dropout (typical): 0.82V @ 750mA
• Number Of Regulators: 1
• Current - Output: 500mA
• Current - Limit (min): 750mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LM2925T; LM2925

Application Hints
(Continued)
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
effective capacitance to zero. To maintain regulator stability
down to −40˚C, capacitors rated at that temperature (such as
tantalums) must be used.
RESET OUTPUT
The range of values for the delay capacitor is limited only by
stray capacitances on the lower extreme and capacitance
leakage on the other. Thus, delay times from microseconds
to seconds are possible. The low charging current, typically
2.0 microamps, allows the use of small, inexpensive disc ca-
pacitors for the nominal range of 100 to 500 milliseconds.
This is the time required in many microprocessor systems for
the clock oscillator to stabilize when initially powered up. The
RESET output of the regulator will thus prevent erroneous
data and/or timing functions to occur during this part of op-
eration. The same delay is incorporated after any other fault
condition in the regulator output is corrected.
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