Texas Instruments LM3940IMPX-3.3 TO-261-4, TO-261AA SOT-223-4

CategoriesIntegrated Circuits (ICs)
PMIC - Voltage Regulators - Linear
Manufacturer Texas Instruments
Series-
Packaging Digi-Reel®
Part StatusDiscontinued at Digi-Key
Output ConfigurationPositive
Output TypeFixed
Number of Regulators1
Voltage - Input (Max)7.5V
Voltage - Output (Min/Fixed)3.3V
Voltage - Output (Max)-
Voltage Dropout (Max)0.2V @ 100mA
Current - Output 1A
PSRR-
Control Features-
Protection Features Over Temperature, Short Circuit
Operating Temperature-40°C ~ 125°C
Mounting Type Surface Mount
Package / Case TO-261-4, TO-261AA
Supplier Device PackageS OT-223-4

Base Part Number LM3940

It is important to note that for most capacitors, ESR is specified only at room temperature. However, the designer must ensure that the ESR will stay inside the limits shown over the entire operating temperature range for the design. For aluminum electrolytic capacitors, ESR will increase by about 30X as the temperature is reduced from 25°C to −40°C. This type of capacitor is not well-suited for low temperature operation. Solid tantalum capacitors have a more stable ESR over temperature, but are more expensive than aluminum electrolytics. A cost-effective approach sometimes used is to parallel an aluminum electrolytic with a solid tantalum, with the total capacitance split about 75/25% with the aluminum being the larger value. If two capacitors are paralleled, the effective ESR is the parallel of the two individual values. The “flatter” ESR of the Tantalum will keep the effective ESR from rising as quickly at low temperatures.

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  1. bigeer2019年4月15日 19:28

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