Speaker Amp Makes Smartphones Louder

A boosted 2.2W Class D amplifier, the MAX98500 integrates a boost converter to provide a constant output power and, therefore, louder audio output over a wide range of battery supply voltages. It also includes a battery-tracking automatic-level-control circuit that limits the maximum output swing as the supply voltage drops to prevent battery voltage from collapsing. The device accepts a 2.5V to 5.5V supply range and is operational down to 2.3V. Other features include a total efficiency of 85% and a 2.1 mm x 2.1 mm, 16-bump wafer-level package with a 0.5-mm lead pitch. Prices start at $0.72 each/1,000. MAXIM INTEGRATED PRODUCTS, Sunnyvale, CA. (800) 998-8800.