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LP5900TL-1.8 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LP5900TL-1.8 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 10 page Typical Performance Characteristics. Unless otherwise specified,C IN =COUT = 0.47µF, VIN = VOUT(NOM) + 1.0V, VEN = 1.2V, IOUT =1mA,T A =25 oC. (Continued) Enable Start-up Time, (I L= 1mA, VOUT = 2.8V) Enable Start-up Time, (I L= 100mA, VOUT = 2.8V) 20144146 20144147 Dropout Over Temperature (100mA) 20144105 Application Hints POWER DISSIPATION AND DEVICE OPERATION The permissible power dissipation for any package is a measure of the capability of the device to pass heat from the power source, the junctions of the IC, to the ultimate heat sink, the ambient environment. Thus the power dissipation is dependent on the ambient temperature and the thermal resistance across the various interfaces between the die and ambient air. As stated in (Note 5) of the electrical character- istics, the allowable power dissipation for the device in a given package can be calculated using the equation: The actual power dissipation across the device can be rep- resented by the following equation: P D =(VIN –VOUT)xIOUT This establishes the relationship between the power dissipa- tion allowed due to thermal consideration, the voltage drop across the device, and the continuous current capability of the device. These two equations should be used to deter- mine the optimum operating conditions for the device in the application. EXTERNAL CAPACITORS Like any low-dropout regulator, the LP5900 requires external capacitors for regulator stability. The LP5900 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. INPUT CAPACITOR An input capacitor is required for stability. The input capacitor should be at least equal to or greater than the output capaci- tor. It is recommended that a 0.47 µF capacitor be connected between the LP5900 input pin and ground. www.national.com 8 |
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