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ELECTRICALCHARACTERISTICS
bq24721
SLUS683–NOVEMBER2005
8Vdc
≤
V
(vcc)
≤
24vdc,0
°
C
≤
T
J
≤
125
°
c,allvoltageswithrespecttoagnd(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
BATTERYVOLTAGEREGULATION
V
bat_icr
VBATInputvoltagerangeV
(bat)
0PVCCV
T
J
=0
°
C–85
°
c–0.40.4%
fullvalidvoltagedacrange,
BatteryRegulationVoltageAccuracy
SMBusDACregister0
×
15
T
J
=0
°
C–125
°
c–0.50.5%
V
(vbatreg)
batvoltageregulationrange919.2v
pwmacadapterinputcurrentregulation,dpm(dynamicpowermanagement)
acp-acndifferentialvoltagerangev
(ireg_dpm)
=V
(acp)
-v
(acn)
V
(ireg_dpm)
1.28162.56mv
forinputcurrentregulationSMBusDACregister0
×
3f,bitsb0–b13
CurrentregulationLSBprogrammingV
(acp-acn)
/10m
Ω
I
(reg_步伐_dpm)
128mA
currentstepUsinga10m
Ω
senseresistor,r
(sns)
V
(acp)
–V
(acn)
>40.96mv
–33%
(4096mawith10m
Ω
)
V
CC
≥
V
CC
(最小值),
V
CC
≥
V
i(bat)
+V
(做-最大值)
,
(1)
V
(acp)
–V
(acn)
>20.48mv
currentregulationaccuracyoverdifferentialthresholdrange,v
(ireg)
,–55%
(2048mawith10m
Ω
)
Doesnotincludeerrorinducedbythe
toleranceofthesenseresistor,r
(sns)
V
(acp)
–V
(acn)
>5.12mv
–2525%
(512mawith10m
Ω
)
PWMBATTERYCHARGECURRENTREGULATION
srp-srndifferentialvoltagerangev
(ireg_chg)
=V
(srp)
-v
(srn)
V
(ireg_chg)
1.28162.56mv
forinputcurrentregulationSMBusDACregister0
×
14,bitsb0–b13
CurrentregulationLSBprogrammingV
(srp-srn)
/10m
Ω
I
(reg_步伐_chg)
128mA
currentstepUsinga10m
Ω
senseresistor,r
(sns)
V
(srp-srn)
>40.96mv
–33%
(4096mawith10m
Ω
)
V
CC
≥
V
CC
(最小值),
V
CC
≥
V
i(bat)
+V
(做-最大值)
,
(1)
V
(srp-srn)
>20.48mv
currentregulationaccuracyoverdifferentialthresholdrange,v
(ireg)
,–55%
(2048mawith10m
Ω
)
Doesnotincludeerrorinducedbythe
toleranceofthesenseresistor,r
(sns)
V
(srp-srn)
>5.12mv
–2525%
(512mawith10m
Ω
)
CHARGECURRENTAMPLIFIER–IBATAMPLIFIERandIADAPTAMPLIFIER
→
MUXTOIOUT
srp,srncommon-modeinput
2.520v
voltagerange
V
(iout_ibat)
IOUToutputvoltagerangewithIBATV
(iout)
=V
(srp,srn)
×
一个
(ibat)
03.5v
selectedV
(bat)
>2.5vorv
(bat)
>v
(iout)
+V
(做-最大值)
(1)
一个
(ibat)
VoltagegainA
(iout)
=V
(iout)
/v
(srp,srn)
20v/v
V
(srp,srn)
=40mVandhigher–22%
V
(bat)
>2.5vorv
(bat)
>
V
(iout)
+V
(做-最大值)
(1)
ChargecurrentamplifieraccuracyV
(srp,srn)
=20mVandhigher–33%
V
(srp,srn)
=5mVandhigher–2525%
acp,acncommon-modeinput
024V
voltagerange
V
(iout_iadapt)
IOUToutputvoltagerangewithV
(iout)
=V
(acp,acn)
×
一个
(iadp)
03.5v
IADAPTselectedV
(srp)
>2.5vorv
(srp)
>v
(iout)
+1V
一个
(iadp)
VoltagegainA
(iadp)
=V
(iout)
/v
(acp,acn)
20v/v
V
(acp,acn)
=40mVandhigher–22%
V
(bat)
>2.5vorv
(bat)
>
AdaptercurrentamplifieraccuracyV
(acp,acn)
=30mVandhigher–33%
V
(iout)
+V
(做-最大值)
(1)
V
(acp,acn)
=5mVandhigher–2525%
I
(输出_lim)
ioutoutputcurrentlimitioutshortedtoagnd4.5ma
(1)v
(做-最大值)
isdefinedasthemaximumdrop-outvoltage.v
(做-最大值)
=1vunlessotherwisespecified.inanactualapplication,v
(做-最大值)
=
(r
(sns)
*I
O
)+v
(dson_高_一侧_场效应晶体管)
+V
(dson_绕过_场效应晶体管)
.
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