_5V_from_a_3_V_battery_with_no_inductors

Published:2009/7/24 8:44:00 Author:Jessie | From:SeekIC

This inductorless dc/dc converter generates a regulated +5 V at up to 100 mA from a single lithium cell. When powered by a DL123A (smaller than an AA cell), the circuit provides 40 mA of load current for 12 hours or more. The MAX660 in a doubler configuration steps up the battery voltage to +6 V, which is then regulated down to + 5 V by the MAX667. The surface-mount version of this circuit occupies only 1/2 square inches of PC-board space, because the circuit uses capacitors instead of inductors. The circuit capitalizes on the low dropout voltage of the MAX667 (typically less than 100 mV at 150 mA) and the 100-mA load capability and 95% efficiency of the MAX660.



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