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LM4120AIM5-2.5 Datasheet(PDF) 11 Page - Texas Instruments |
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LM4120AIM5-2.5 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 26 page LM4120 www.ti.com SNVS049D – FEBRUARY 2000 – REVISED JULY 2015 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information The standard application circuit for the LM4120 is shown in Figure 29. The device is designed to be stable with ceramic output capacitors in the range of 0.022 µF to 0.047 µF. The minimum required output capacitor is 0.022 µF. These capacitors typically have an ESR of about 0.1 Ω to 0.5 Ω. Smaller ESR can be tolerated, but larger ESR cannot be tolerated. The output capacitor can be increased to improve load transient response, up to about 1 µF. However, values above 0.047 µF must be tantalum. With tantalum capacitors in the 1-µF range, a small capacitor between the output and the reference pin is required. This capacitor will typically be in the 50-pF range. Care must be taken when using output capacitors of 1 µF or larger. These applications must be thoroughly tested over temperature, line, and load. An input capacitor is typically not required. However, a 0.1-µF ceramic can be used to help prevent line transients from entering the LM4120. Larger input capacitors must be tantalum or aluminium. The reference pin is sensitive to noise, and capacitive loading. Therefore, the PCB layout must isolate this pin as much as possible. The enable pin is an analog input with very little hysteresis. About 6 µA into this pin is required to turn the part on, and it must be taken close to GND to turn the part off (see Electrical Characteristics for thresholds). If the shutdown feature is not required, then this pin can safely be connected directly to the input supply. Figure 19. Voltage Reference With Negative Output Circuit Figure 20. Precision High-Current Low-Dropout Regulator Circuit Copyright © 2000–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM4120 |
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