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LT1304 Datasheet(PDF) 10 Page - Linear Technology |
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LT1304 Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page 10 LT1304/LT1304-3.3/LT1304-5 OPERATIO LOAD CURRENT (mA) 1 100 90 80 70 60 50 40 30 20 10 0 10 100 1304 F12 200 TYPICAL APPLICATIONS VIN SW SHDN GND LBI LBO ILIM FB LT1304 + + 220 µF 100 µF 0.01 µF 47k 2 CELLS 33 µH** IQ ≈ 10µA 5V 100mA 1% METAL FILM SUMIDA CD54-330 * ** 1304 TA03 47k 22k 1.21M* 3.83M* MBR0530 200k 2N3906 Super Burst TM Low IQ DC/DC Converter LOAD CURRENT (mA) 40 50 70 60 80 90 100 1304 TA04 0.01 0.1 1.0 10 VIN = 3V VIN = 2V Super Burst Efficiency Super Burst is a trademark of Linear Technology Corporation. Figure 12 shows overall energy conversion efficiency, assuming availability of 6.5WH of battery energy. This efficiency approximates the electrical efficiency at load current levels from 1mA to 10mA, but drops severely at load currents above 10mA (load power above 50mW). The moral of the story is this: if your system needs 5V at more than 40mA to 50mA, consider using a NiCd battery (1/10 the internal impedance) instead of a AA cell alkaline battery. Figure 12. Overall System Efficiency Including Battery Efficiency vs Load Current. Internal Impedance of Alkaline AA Cells Accounts for Rapid Drop in Efficiency at Higher Load Current |
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