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产品
输出
nc − 非 内部的 连接
1
2
3
4
5
dcq pACKAGE
NR
输出
地
在
EN
2
1
3
4
7
8
6
5
NC
FB
NR
在
NC
EN
地
sot223-6
(t运算 视图)
dgn pACKAGE
msop powerpAD
(t运算 视图)
I
输出
= 10 毫安
I
输出
= 250 毫安
V
在
= 4.3 v,
V
输出
= 3.3 v,
C
在
= 1
µ
f,
C
输出
= 10
µ
f,
C
NR
= 0.01
µ
F
40
20
10
10 100 1 k 10 k
波纹 拒绝 (db)
60
70
频率 (hz)
TPS79433
波纹拒绝
vs
频率
90
100 k 1 m 10 m
0
30
50
80
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
I
输出
= 250 毫安
I
输出
= 1 毫安
C
输出
= 2.2
µ
f,
C
NR
= 0.1
µ
f,
V
在
= 3.8 v
TPS79428
输出谱的 噪音 密度
vs
频率
频率(hz)
100 1000 10000 100000
6
地
输出 谱的 噪音 密度 (
µ
v/
√
hz)
tps79401,tps79418
tps79425,tps79428
tps79430,tps79433
SLVS349D–NOVEMBER2001–REVISEDOCTOBER2004
ultralow-噪音,highpsrr,fastrf250-malow-dropoutlinear
REGULATORS
•
250-malow-dropoutregulatorwithenable
thetps794xxfamilyoflow-落后(ldo)直线的
voltageregulatorsfeatureshighpower-supplyrejec-
•
availablein1.8v,2.5v,2.8v,3v,3.3v,和
tionratio(psrr),ultralow-噪音,faststart-向上,和
可调整的(1.2vto5.5v)
excellentlineandloadtransientresponsesinsmall
•
highpsrr(60dbat10khz)
外形,msop-8powerpad™andsot223-6pack-
•
ultralownoise(32µvrms,tps79428)
ages.eachdeviceinthefamilyisstablewithasmall
2.2-µfceramiccapacitorontheoutput.thefamily
•
faststart-uptime(50µs)
usesanadvanced,proprietarybicmosfabrication
•
stablewitha2.2-µfceramiccapacitor
processtoyieldextremelylowdropoutvoltages(e.g.,
•
excellentload/linetransientresponse
155mvat250ma).eachdeviceachievesfast
开始-uptimes(approximately50µswitha0.001-µf
•
verylowdropoutvoltage(155mvatfull
bypasscapacitor)whileconsuminglowquiescent
加载)
电流(170µatypical).moreover,whenthedevice
•
availableinmsop-8andsot223-6packages
isplacedinstandbymode,thesupplycurrentis
reducedtolessthan1µa.thetps79428exhibits
approximately32µV
RMS
ofoutputvoltagenoiseat
•
rf:vcos,接受者,adcs
2.8voutputwitha0.1-µfbypasscapacitor.appli-
cationswithanalogcomponentsthatare
•
音频的
噪音-敏感的,suchasportablerfelectronics,
•
bluetooth™,wirelesslan
benefitfromthehighPSRRandlownoisefeaturesas
•
CellularandCordlessTelephones
wellasthefastresponsetime.
•
handheldorganizers,pdas
pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
bluetoothisatrademarkofbluetoothsig,公司
powerpadisatrademarkoftexasinstruments.
allothertrademarksarethepropertyoftheirrespectiveowners.
productiondatainformationiscurrentasofpublicationdate.
copyright©2001–2004,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
necessarilyincludetestingofallparameters.
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