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AS1374-BWLT18285 Datasheet(PDF) 11 Page - ams AG |
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AS1374-BWLT18285 Datasheet(HTML) 11 Page - ams AG |
11 / 19 page AS1374 Datasheet - Application In form atio n www.austriamicrosystems.com/LDOs/AS1374 Revision 1.8 10 - 18 9 Application Information 9.1 Dropout Voltage Dropout is the input to output voltage difference, below which the linear regulator ceases to regulate. At this point, the output voltage change follows the input voltage change. Dropout voltage may be measured at different load currents, but is usually specified at maximum output. As a result, the MOSFET maximum series resistance over temperature is obtained. More generally: VDROPOUT = ILOAD x RSERIES (EQ 1) Dropout is probably the most important specification when the regulator is used in a battery application. The dropout performance of the regulator defines the useful “end of life” of the battery before replacement or re-charge is required. Figure 26. Graphical Representation of Dropout Voltage Figure 26 shows the variation of VOUT as VIN is varied for a certain load current. The practical value of dropout is the differential voltage (VOUT- VIN) measured at the point where the LDO output voltage has fallen by 100mV below the nominal, fully regulated output value. The nominal regulated output voltage of the LDO is that obtained when there is 500mV (or greater) input-output voltage differential. 9.2 Efficiency Low quiescent current and low input-output voltage differential are important in battery applications amongst others, as the regulator efficiency is directly related to quiescent current and dropout voltage. Efficiency is given by: Efficiency = % (EQ 2) Where: IQ = quiescent current of LDO Dropout Voltage 100mV VIN VOUT VOUT VIN VOUT VIN=VOUT(TYP)+0.5V VIN V LOAD I LOAD V IN IQ I LOAD + ----------------------------------------- 100 |
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