BQ24171 Datasheet, PDF (10/35 Pages) Texas Instruments – JEITA Compliant Stand-Alone Switch-Mode Li-Ion and Li-Polymer Battery Charger with Integrated MOSFETs and Power Path Selector

bq24171
SLUSAF2A – FEBRUARY 2011 – REVISED MAY 2011
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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
CHARGE OVER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
V_{OCP_CHRG}
Charge Over-Current Rising Threshold,
V_SRP>2.2V
V_{OCP_MIN}
Charge Over-Current Limit Min, V_SRP<2.2V
V_{OCP_MAX}
Charge Over-Current Limit Max, V_SRP>2.2V
HSFET OVER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
Current as percentage of fast charge current
Measure V_SRP-SRN
Measure V_SRP-SRN
I_{OCP_HSFET}
Current limit on HSFET
Measure on HSFET
CHARGE UNDER-CURRENT COMPARATOR (CYCLE-BY-CYCLE)
V_UCP
Charge under-current falling threshold
BAT SHORT COMPARATOR
Measure on V_(SRP-SRN)
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
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
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
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
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
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
t_{BATFET_DEG}
BATFET Power-up Delay to turn off
BATFET after adapter is detected
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
AC/BAT SWITCH DRIVER TIMING
t_{DRV_DEAD}
Driver Dead Time
Dead Time when switching between ACFET and
BATFET
MIN
8
1
3.267
35
5.7
40
1620
1
-10%
45
4.2
4.2
500
TYP MAX UNITS
160%
45
mV
75
mV
11.5
A
5
9 mV
2
V
200
mV
1
µs
10% ⁽⁴⁾
3.3 3.333
V
90 mA
6.0
6.3
V
120 mA
1800
5.6
50
1.5
1
1980
10
10%
0.4
55
Sec
hr
min/nF
V
µA
V
V
100 Ω
20 kΩ
7
V
30
ms
60
µA
6
V
kΩ
10
µs
(4) The minimum current is 120 mA on 10mΩ sense resistor.
10
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