www.德州仪器.com
bq24030,bq24031,bq24032,
bq24032a,bq24035,bq24038,bq24039
SLUS618C–AUGUST2004–REVISEDJUNE2005
electricalcharacteristics(持续)
overjunctiontemperaturerange(0°c
≤
T
J
≤
125°c)andtherecommendedsupplyvoltagerange(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
SWITCHINGPOWERSOURCETIMING
onlyacpowerorusbpowerapplied.
measurefrom:
switchingpowersourcefromin-
t
sw-bat
[xxpg:lo
→
hitoi(xx)>5ma],50
puts(acorusb)tobattery
xx=acorusbi(输出)=100ma,
R
TRM
=50K
switchingfromactousb,或者,µs
measurefrom:
t
sw-交流/usb
usbtoacbyinputsourcere-100
i(交流)<5matoi(usb)>5maori(usb)
moval.
(20)
<5ma
→
i(交流)>5ma;
switchingfromactousb,或者
i(输出)=100ma,r
TMR
=50k,
t
sw-psel
usbtoacbytogglingpsel,50100
iset2=hi,r
输出
>15
Ω
,v
DPPM
=2.5v
bq24030/1/2/2a/5/8only
THERMALSHUTDOWNREGULATION
(21)
T
(shtdwn)
TemperaturetripT
J
(q1andq3only)155
ThermalhysteresisT
J
(q1andq3only)30°c
T
j(reg)
TemperatureregulationlimitT
J
(q2)115135
UVLO
V
(uvlo)
UndervoltagelockoutDecreasingV
CC
2.452.502.65v
Hysteresis27mV
(20)thepowerhandoffisimplementedoncethepgpingoeshigh(removedsourcespg)whichiswhentheremovedsourcedropstothe
batteryvoltage.ifthebatteryvoltageiscriticallylow,thesystemmaylosepowerunlessthesystemtakescontrolofthepselpinand
switchestotheavailablepowersourcepriortoshutdown.theusbsourceoftenhaslesscurrentavailable;所以,thesystemmayhaveto
reduceitsloadwhenswitchingfromactousb(bq24030/1/2/2a/5/8).
(21)reachingthermalregulationreducesthechargingcurrent.batterysupplementcurrentisnotrestrictedbyeitherthermalregulationor
关闭.inputpowerfetsturnoffduringthermalshutdown.thebatteryfetisonlyprotectedbyashort-circuitlimitwhichtypically
doesnotcauseathermalshutdown(inputfetsturningoff)byitself.
8
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