BQ24171_15 Datasheet, PDF (10/39 Pages) Texas Instruments – bq24171 JEITA-Compliant Stand-Alone, Switched-Mode Li-Ion and Li-Polymer Battery Charger With Integrated MOSFETs and Power Path Selector

bq24171
SLUSAF2C – FEBRUARY 2011 – REVISED APRIL 2015
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Electrical Characteristics (continued)
4.5 V ≤ V(PVCC, AVCC) ≤ 17 V, –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
CHARGE OVERCURRENT COMPARATOR (CYCLE-BY-CYCLE)
V_{OCP_CHRG}
Charge Overcurrent Rising Threshold, V_SRP
> 2.2 V
Current as percentage of fast charge current
160%
V_{OCP_MIN}
Charge Overcurrent Limit Min, V_SRP < 2.2 V Measure V_SRP-SRN
45
V_{OCP_MAX}
Charge Overcurrent Limit Max, V_SRP > 2.2 V Measure V_SRP-SRN
75
HSFET OVERCURRENT COMPARATOR (CYCLE-BY-CYCLE)
I_{OCP_HSFET}
Current limit on HSFET
Measure on HSFET
CHARGE UNDERCURRENT COMPARATOR (CYCLE-BY-CYCLE)
8
11.5
V_UCP
Charge undercurrent falling threshold
BAT SHORT COMPARATOR
Measure on V_(SRP-SRN)
1
5
9
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
200
1
10% ⁽²⁾
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
90
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
6.3
40
120
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
10
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
0.4
45
50
55
1.5
1
R_{DS_BAT_OFF}
R_{DS_BAT_ON}
V_{BATDRV_REG}
BATFET Turnoff Resistance
BATFET Turnon Resistance
BATFET Drive Voltage
V_AVCC > 5 V
100
V_AVCC > 5 V
20
V_{BATDRV_REG} = V_ACN - V_BATDRV when V_AVCC > 5 V
and BATFET is on
4.2
7
t_{BATFET_DEG}
BATFET Power-up Delay to turn off
BATFET after adapter is detected
30
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 = 5 V
V_ACDRV – V_CMSRC when V_AVCC > V_UVLO
60
4.2
6
500
AC/BAT SWITCH DRIVER TIMING
t_{DRV_DEAD}
Driver Dead Time
Dead Time when switching between ACFET and
BATFET
10
UNIT
mV
mV
A
mV
V
mV
µs
V
mA
V
mA
Sec
hr
min/nF
V
µA
V
V
Ω
kΩ
V
ms
µA
V
kΩ
µs
10
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