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AS1364 pdf datasheet

2072275 2008-07-29 | rar | 666 | 次下载 | 10积分

资料介绍

The AS1364 operates from a 2 to 5.5 V supply and hence it is ideal for dual or triple standard-cell and single Li-Ion battery powered applications. The regulator offers very low dropout voltage of 140mV at 1A. The quiescent current too is very low of just 35microA during operation and 10nA at shutdown. Battery life is greatly maximized while using AS1364.

“There is a growing demand of applications requiring high currents and the need of a LDO smoothed voltage,” commented Walter Moshammer, marketing director of standard linear at austriamicrosystems.

“At currents rated around 1A, the dropout voltage is the most important factor for lifetime and efficiency of the system. Austriamicrosystems’ AS1364 fulfils these needs completely,” added Moshammer enthusiastically.

The AS1364 can be an adjustable version or it comes with pre-programmed output voltages in the range of 1.2 to 5.0V with a very high output voltage accuracy of 0.75 percent. The adjustable version allows high flexibility in design and does not require a bypass capacitance, while the pre-programmed version provides better noise performance with a bypass pin.

The regulator has low output voltage noise of 50microVrms in the adjustable version and only 10microVrms in the pre-programmed version. The AS1364 also has a power-ok output that signals when the output voltage drops out of regulation by about six percent.

AS1364 的工作电压为 2 至 5.5V,可理想应用于双节或三节标准电池及单节锂离子电池供电的应用.在 1A 典型负载条件下,AS1364 工作时的最低压差为 140mV,并具有 35µA 的超低静态电流,关断电流仅有 10nA,从而最大程度延长了电池使用寿命.

AS1364 提供电压可调或预置输出电压版本,其电压范围为 1.2 至 5.0V.1A 负载条件下,最差情况的输出电压精度也可达到 2% 甚至更好.可调电压版本可实现最大设计灵活性,且不需旁路电容,预置电压版本则可借助一个旁路引脚来改善噪声性能.因此,可调版本的噪声可实现 50µVrms 的不错性能,而预置版本则可进一步实现10µVrms 的卓越性能.另外,在输出电压达到标称值的 6% 容差之内时,AS1364 将给出一个电源正常的输出信号.

AS1364 的数字使能引脚可实现系统级动态电源管理功能.此外,AS1364 还能提供高温和过流保护.AS1364 适用的工作环境温度范围为 -40至+85°C.