Power Managers Reduce Footprint

Reporting a footprint reduction of 72%, the MAX8621Y and MAX8621Z power managers integrate 4-MHz step-down dc/dc converters, four LDO regulators, a reset timer, and an open-drain driver in 24-pin TQFN packages measuring 4 mm x 4 mm. A comparable design employing seven discrete SOT23 components would, reportedly, consume 75 mm² of board space. The device’s converter outputs are sequenced to ensure proper microprocessor startup, and the LDOs provide individual on/off controls. This allows the devices replace discrete designs without requiring software to be rewritten. Both devices exhibit efficiencies up to 92%, allowing the use of a 1 ΜH inductor. The four LDOs deliver outputs up to 45 µV_RMS, two of which supply 300 mA (out 1 and 2) while the remainders contribute 150 mA each (out 3 and 4). Other features include an operating temperature range from -40°C to +85°C. Prices start at $3.70 each/1,000. MAXIM INTEGRATED PRODUCTS, Sunnyvale, CA. (800) 998-8800.