Torex Semiconductor Ltd. has developed two new series of step-down, synchronous dc-dc converters with Torex’s unique HiSAT-COT (High-Speed circuit Architecture for Transients with Constant On Time) fast transient response control in an ultra-small package (1.2mm x 1.4mm x 0.3mm). The XC9259 series and XC9262 series are step-down synchronous dc-dc converters with a low ON resistance. These dc-dc converters are housed in the ultra-small LGA-8B01 (1.2mm x 1.4mm x 0.3mm) package.
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Compared to regular COT control, Torex’s HiSAT-COT control enables greater suppression of frequency fluctuations caused by the load and input voltage. The response speed is eight times faster than previous products, and the output voltage drop is reduced by 50%. A 1005-size ceramic capacitor can be used
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The output voltage can be set internally to a value from 0.8V to 3.6V (±2.0%) in steps of 0.05V. The only external components used are a coil and capacitor, and a high-efficiency, stable power supply with an output current of 1.0A (XC9259 series) or 1.5A (XC9262 series) can be obtained. Oscillation frequencies are 1.2MHz or 3.0MHz (XC9262 series only), and 6.0MHz (XC9259 series only), allowing selection of the optimum frequency for the application.
By stopping all circuits during standby, the quiescent current is reduced to 1.0μA or less. The soft start function starts the IC in a quick 0.30ms (TYP.). An internal UVLO (Under Voltage Lock Out) function forcibly shuts OFF the internal Pch MOS driver transistor when the input voltage drops to 2.0V or less. The B type includes a CL discharge function that discharges the output capacitor during standby. These converters are designed for various portable devices, as well as applications such as microprocessors where it is desirable to prevent malfunctioning.
source: http://www.powerpulse.net/story.php?storyID=32287
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