Replacing_a_9_V_battery_with_two_AA_cells

Published:2009/7/24 23:12:00 Author:Jessie | From:SeekIC

Figure 8-75 shows an LT1120 linear regulator used with a 9-V battery to provide a 5-V, 30-mA output. Figure 8-76 shows an LT1173-5 switching regulator used with a 9-V battery to provide the same output. Figure 8-77 shows the same LT1173-5 used with two AA cells to provide the same output (step-up). Figure 8-78 shows efficiency for the step-down circuits. Figure 8-79 shows efficiency for the step-up (two-AA cell) circuit. The battery life for the three circuits is shown in Figs. 8-80, 8-81, and 8-82, respectively. A study of these curves shows that efficiency remains higher, and battery life is longer, with the two AA cells, for the same voltage and current output. LINEAR TECHNOLOGY, DESIGN NOTE 63, P. 1, 2.



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