Sunnyvale, Calif. - Advanced Analogic Technologies' AAT3239
is a low-dropout regulator (LDO) designed for high continuous load currents and with particular attention to the device's thermal characteristics for maintaining an overall high level of performance. The 500-mA source, for battery-powered applications, features fast line and load transient response, high-speed turn-on and shut-down, and a high power-supply-rejection-ratio (PSRR).
"As load currents and input-to-output voltage differences rise in next generation cellular phones, notebook computers and other portable products, designers need LDOs with better power handling and thermal performance than standard SOT and MSOP packages," noted Erik Ogren, product marketing manager from AnalogicTech. "Mounted in a specially-designed 8-pin TSOPJW package, the 3-by-2.85 mm AAT3239 offers a 500 mA output current, capable of supporting a wide range of low-voltage digital circuits."
The AAT3239 is factory-programmed to deliver 1.5, 1.85 or 3.3 volts to within ±1.5 percent. At 300 mA, the AAT3239's dropout voltage is typically 400 mV. Quiescent current is 70 microamps. Users can enhance PSRR performance and minimize output noise by adding a small external capacitor from the device's reference output to ground. PSRR is typically 67 dB at 1 kHz, 45 dB at 1 MHz.
The chip features output short-circuit protection and a thermal-shutdown circuit to protect the device in extreme operating conditions. Pricing starts at 78 cents each in 1k quantities.