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LT1304-3.3 Datasheet(PDF) 9 Page - Linear Technology |
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LT1304-3.3 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LT1304/LT1304-3.3/LT1304-5 OPERATIO VLBO 2V/ DIV VLBI 200mV/DIV 1304 F08 LOAD CURRENT (mA) 1 100 200 1304 F10 10 1000 100 10 1 Figure 10. Battery Life vs Load Current. Dots Specify Actual Measurements LOAD CURRENT (mA) 1 6 5 4 3 2 1 0 10 100 1304 F11 200 Figure 11. Output Watt Hours vs Load Current. Note Rapid Fall-Off at Higher Discharge Rates Figure 8. Low-Battery Detector Transfer Function. Pull-Up R = 22k, VIN = 2V, Sweep Frequency = 10Hz VIN SW GND ILIM SENSE SHDN LB0 LB1 LT1304-5 C2 100 µF C1 100 µF B1 2 CELLS L1 22 µH D1 VOUT 5V 200mA B1 = 2 × EVEREADY INDUSTRIAL ALKALINE AA CELLS #EN91 C1, C2 = AVX TPSD107M010R0100 D1 = MOTOROLA MBRS130L L1 = SUMIDA CD54-220 1304 F09 + + Figure 9. 2-Cell to 5V Converter Used in Battery Life Study Battery Life How may hours does it work? This is the bottom line question that must be asked of any efficiency study. AA alkaline cells are not perfect power sources. For efficient power transfer, energy must be taken from AA cells at a rate that does not induce excessive loss. AA cells internal impedance, about 0.2 Ωfreshand0.5Ωend-of-life,results in significant efficiency loss at high discharge rates. Figure 10 illustrates battery life vs load current of Figure 9’s LT1304, 2-cell to 5V DC/DC converter. Note the acceler- ated decrease in hours at higher power levels. Figure 11 plots total watt hours vs load current. Watt hours are determined by the following formula: WH = ILOAD(5V)(H) Figure 11’s graph varies significantly from electrical effi- ciency plot pictured on the first page of this data sheet. Why? As more current is drawn from the battery, voltage drop across the cells’ internal impedance increases. This causes internal power loss (heating), reducing cell termi- nal voltage. Since the regulator input acts as a negative resistance, more current is drawn from the battery as the terminal voltage decreases. This positive feedback action compounds the problem. |
Similar Part No. - LT1304-3.3_15 |
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Similar Description - LT1304-3.3_15 |
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