5_V_from_four_cells_switchabie_step_up_step_down

Published:2009/7/24 23:41:00 Author:Jessie | From:SeekIC

Figure 8-104 shows a MAX639 connected to provide a 5-V output from four cells，This circuit switches from step-down to step-up mode as the battery output fallsbelow 5 V The circuit operates over an input-voltage range of 3 V to 6.5 V. with aquiescent current (VIN＝5.5 V) of 50 μA, and 110 μA for a VIN of 4.5 V The maximum load current is 200 mA with a VIN of 3.75 V Battery life is 17.2 hours(using four alkaline AA cells with 100-mA load)．Figure 8-105 shows the efficiencycurves．MAXIM BATTERY MANAGEMENT CIRCUIT COLLECTION, 1994. P. 24.



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