bq24170
bq24172
SLUSAD2A –NOVEMBER 2010–REVISED NOVEMBER 2010
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ELECTRICAL CHARACTERISTICS (continued)
4.5V ≤ V(PVCC, AVCC) ≤ 17V, –40°C < TJ + 125°C, typical values are at TA = 25°C, with respect to AGND (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
BAT SHORT COMPARATOR
VBATSHT
Battery short falling threshold
Battery short rising hysteresis
Deglitch on both edges
Measure on SRN
2
200
V
VBATSHT_HYS
tBATSHT_DEG
VBATSHT
Measure on SRN
mV
µs
1
Charge Current during BATSHORT
Percentage of fast charge current
10%(4)
VREF REGULATOR
VVREF_REG
IVREF_LIM
VREF regulator voltage
VREF current limit
VAVCC > VUVLO, No load
3.267
35
3.3
6.0
3.333
90
V
VVREF = 0 V, VAVCC > VUVLO
mA
REGN REGULATOR
VREGN_REG
IREGN_LIM
REGN regulator voltage
REGN current limit
VAVCC > 10 V, ISET > 120 mV
5.7
40
6.3
V
VREGN = 0 V, VAVCC > 10 v, ISET > 120 mV
120
mA
TTC INPUT
tprechrg
Precharge Safety Timer
Fast Charge Timer Range
Fast Charge Timer Accuracy
Timer Multiplier
Precharge time before fault occurs
Tchg=CTTC*KTTC
1620
1
1800
5.6
1980
10
Sec
hr
tfastchrg
-10%
10%
KTTC
min/nF
VTTC_LOW
ITTC
VTTC_OSC_HI
VTTC_OSC_LO
TTC Low Threshold
TTC falling
0.4
55
V
µA
V
TTC Source/Sink Current
TTC oscillator high threshold
TTC oscillator low threshold
45
50
1.5
1
V
BATTERY SWITCH (BATFET) DRIVER
RDS_BAT_OFF BATFET Turn-off Resistance
RDS_BAT_ON
VAVCC > 5V
VAVCC > 5V
100
20
Ω
BATFET Turn-on Resistance
BATFET Drive Voltage
kΩ
VBATDRV_REG =VACN - VBATDRV when VAVCC > 5V
and BATFET is on
VBATDRV_REG
tBATFET_DEG
4.2
7
V
BATFET Power-up Delay to turn off
BATFET after adapter is detected
30
ms
AC SWITCH (ACFET) DRIVER
IACFET
ACDRV Charge Pump Current Limit
VACDRV - VCMSRC = 5V
60
6
µA
V
VACDRV_REG
Gate Drive Voltage on ACFET
VACDRV - VCMSRC when VAVCC > VUVLO
4.2
Maximum load between ACDRV and
CMSRC
RACDRV_LOAD
500
kΩ
AC/BAT SWITCH DRIVER TIMING
tDRV_DEAD Driver Dead Time
BATTERY DETECTION
Dead Time when switching between ACFET and
BATFET
10
µs
tWAKE
Wake timer
Max time charge is enabled
RSENSE = 10 mΩ
500
125
1
ms
mA
IWAKE
Wake current
50
200
tDISCHARGE
IDISCHARGE
IFAULT
Discharge timer
Max time discharge current is applied
sec
Discharge current
8
mA
Fault current after a timeout fault
2
mA
Measure on SRN (bq24170)
Measure on FB (bq24172)
Measure on SRN (bq24170)
Measure on VFB (bq24172)
100
50
mV/cell
mV
Wake threshold with respect to VREG To
detect battery absent during WAKE
VWAKE
2.9
1.45
V/cell
V
Discharge Threshold to detect battery
absent during discharge
VDISCH
(4) The minimum current is 120 mA on 10mΩ sense resistor.
12
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