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AS1364 pdf datasheet

2072275 2008-07-29 | rar | 666 | 次下載 | 10積分

資料介紹

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 的工作電壓為 2 至 5.5V,可理想應用于雙節(jié)或三節(jié)標準電池及單節(jié)鋰離子電池供電的應用.在 1A 典型負載條件下,AS1364 工作時的最低壓差為 140mV,并具有 35μA 的超低靜態(tài)電流,關斷電流僅有 10nA,從而最大程度延長了電池使用壽命.

????? AS1364 提供電壓可調或預置輸出電壓版本,其電壓范圍為 1.2 至 5.0V.1A 負載條件下,最差情況的輸出電壓精度也可達到 2% 甚至更好.可調電壓版本可實現(xiàn)最大設計靈活性,且不需旁路電容,預置電壓版本則可借助一個旁路引腳來改善噪聲性能.因此,可調版本的噪聲可實現(xiàn) 50μVrms 的不錯性能,而預置版本則可進一步實現(xiàn)10μVrms 的卓越性能.另外,在輸出電壓達到標稱值的 6% 容差之內時,AS1364 將給出一個電源正常的輸出信號.

?????? AS1364 的數(shù)字使能引腳可實現(xiàn)系統(tǒng)級動態(tài)電源管理功能.此外,AS1364 還能提供高溫和過流保護.AS1364 適用的工作環(huán)境溫度范圍為 -40至+85°C.