BQ24170 Datasheet, PDF (12/35 Pages) Texas Instruments – 1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-Alone Battery Charger

bq24170
bq24172
SLUSAD2A – NOVEMBER 2010 – REVISED NOVEMBER 2010
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ELECTRICAL CHARACTERISTICS (continued)
4.5V ≤ V(PVCC, AVCC) ≤ 17V, –40°C < T_J + 125°C, typical values are at T_A = 25°C, with respect to AGND (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNITS
BAT SHORT COMPARATOR
V_BATSHT
Battery short falling threshold
V_{BATSHT_HYS}
Battery short rising hysteresis
t_{BATSHT_DEG}
Deglitch on both edges
V_BATSHT
Charge Current during BATSHORT
VREF REGULATOR
Measure on SRN
Measure on SRN
Percentage of fast charge current
2
V
200
mV
1
µs
10% ⁽⁴⁾
V_{VREF_REG}
VREF regulator voltage
I_{VREF_LIM}
VREF current limit
REGN REGULATOR
V_AVCC > V_UVLO, No load
V_VREF = 0 V, V_AVCC > V_UVLO
3.267
35
3.3 3.333
V
90 mA
V_{REGN_REG}
I_{REGN_LIM}
TTC INPUT
REGN regulator voltage
REGN current limit
V_AVCC > 10 V, ISET > 120 mV
V_REGN = 0 V, V_AVCC > 10 v, ISET > 120 mV
5.7
6.0
6.3
V
40
120 mA
t_prechrg
t_fastchrg
Precharge Safety Timer
Fast Charge Timer Range
Fast Charge Timer Accuracy
Precharge time before fault occurs
T_chg=C_TTC*K_TTC
1620
1
-10%
1800 1980 Sec
10 hr
10%
K_TTC
Timer Multiplier
V_{TTC_LOW}
TTC Low Threshold
I_TTC
TTC Source/Sink Current
V_{TTC_OSC_HI}
TTC oscillator high threshold
V_{TTC_OSC_LO}
TTC oscillator low threshold
BATTERY SWITCH (BATFET) DRIVER
TTC falling
5.6
min/nF
0.4
V
45
50
55 µA
1.5
V
1
V
R_{DS_BAT_OFF}
R_{DS_BAT_ON}
V_{BATDRV_REG}
BATFET Turn-off Resistance
BATFET Turn-on Resistance
BATFET Drive Voltage
V_AVCC > 5V
V_AVCC > 5V
V_{BATDRV_REG} =V_ACN - V_BATDRV when V_AVCC > 5V
and BATFET is on
4.2
100 Ω
20 kΩ
7
V
t_{BATFET_DEG}
BATFET Power-up Delay to turn off
BATFET after adapter is detected
30
ms
AC SWITCH (ACFET) DRIVER
I_ACFET
V_{ACDRV_REG}
R_{ACDRV_LOAD}
ACDRV Charge Pump Current Limit
Gate Drive Voltage on ACFET
Maximum load between ACDRV and
CMSRC
V_ACDRV - V_CMSRC = 5V
V_ACDRV - V_CMSRC when V_AVCC > V_UVLO
60
µA
4.2
6
V
500
kΩ
AC/BAT SWITCH DRIVER TIMING
t_{DRV_DEAD}
Driver Dead Time
Dead Time when switching between ACFET and
BATFET
10
µs
BATTERY DETECTION
t_WAKE
I_WAKE
t_DISCHARGE
I_DISCHARGE
I_FAULT
V_WAKE
Wake timer
Wake current
Discharge timer
Discharge current
Fault current after a timeout fault
Wake threshold with respect to V_REG To
detect battery absent during WAKE
Max time charge is enabled
R_SENSE = 10 mΩ
Max time discharge current is applied
Measure on SRN (bq24170)
Measure on FB (bq24172)
500
ms
50
125
200 mA
1
sec
8
mA
2
mA
100
mV/cell
50
mV
V_DISCH
Discharge Threshold to detect battery
absent during discharge
Measure on SRN (bq24170)
Measure on VFB (bq24172)
2.9
V/cell
1.45
V
(4) The minimum current is 120 mA on 10mΩ sense resistor.
12
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