BQ24257 Datasheet, PDF (6/45 Pages) Texas Instruments – 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated Current Sense Resistor

bq24257
bq24258
SLUSBG0B – FEBRUARY 2013 – REVISED JULY 2013
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
bq24257 App Circuit, V_UVLO < V_IN < V_OVP AND V_IN > V_BAT+V_SLP, T_J = 0°C – 125°C and T_J = 25°C for typical values (unless
otherwise noted)
PARAMETER
BATTERY DETECTION
V_{BATREG_HI}
Battery detection high regulation
voltage
V_{BATREG_LO}
Battery detection low regulation
voltage
V_{BATDET_HI}
Battery detection comparator
TEST CONDITIONS
Same as V_BATREG
360 mV offset from V_BATREG
V_BATREG = V_{BATREG_HI}
V_{BATDET_LO}
Battery detection comparator
I_DETECT
Battery detection sink current)
t_DETECT
Battery detection time
T_safe
Safety Timer Accuracy
BATTERY CHARGER LiFePO4 (bq24258)
V_REG-OVCHG
V_FLT-CHG
V_OVCHG
V_OVCHG-HYS
t_DGL(OVCHG)
Over charge voltage regulation
Float charge regulation
Overcharge comparator for LiFePo
Deglitch on the overcharge
comparator
INPUT PROTECTION
I_IN
Input current limiting
V_BATREG = V_{BATREG_LO}
Always on during battery detection
For both V_{BATREG_HI} and V_{BATREG_LO}
V_BAT rising
V_BAT falling
I_{IN_LIMIT} = 100 mA
I_{IN_LIMIT} = 150 mA
I_{IN_LIMIT} = 500 mA
I_{IN_LIMIT} = 900 mA
I_{IN_LIMIT} = 1500 mA
I_{IN_LIMIT} = 2000 mA
I_{IN_LIMIT} = External
I_LIM
K_ILIM
V_ILIM
R_ILIM-SHORT
V_{IN_DPM}
V_{REF_DPM}
V_{DPM_SHRT}
V_UVLO
V_SLP
t_DGL(SLP)
V_OVP
Maximum input current limit
programmable range for IN input
Maximum input current factor for IN
input
Maximum ILIM pin voltage (in
regulation)
Short circuit resistance threshold
V_{IN_DPM} threshold range
V_{IN_DPM} threshold accuracy
DPM regulation voltage
VIN_DPM short threshold
IC active threshold voltage
IC active hysteresis
Sleep-mode entry threshold, V_SUPPLY-
VBAT
Sleep-mode exit hysteresis
Deglitch time for supply rising above
V_SLP+V_{SLP_EXIT}
Input supply OVP threshold voltage
(bq24258)
Input supply OVP threshold voltage
(bq24257)
V_OVP hysteresis
I_LIM = 500 mA to 2 A
SA mode
I²C mode
Both I2C and SA mode
External resistor setting only
If VDPM is shorted to ground, V_{IN_DPM}
threshold will use internal default value
V_IN rising
V_IN falling from above V_UVLO
V_IN falling
V_IN rising
Rising voltage, 2-mV over drive, t_RISE =
100ns
IN rising
IN rising
IN falling from V_OVP
MIN
TYP
MAX UNIT
–10%
V_BATREG
V_BATREG
- 480mV
V_BATREG
- 120 mV
V_BATREG
+ 120 mV
7.5
32
3.76
3.8
3.46
3.5
3.65
3.7
300
32
V
V
V
V
mA
ms
10%
3.84
V
3.54
V
3.75
V
mV
ms
90
95
135
142.5
450
475
810
860
1400
1475
1850
1950
I_LIM
=
K_ILIM
R_ILIM
500
100
150
500
mA
910
1550
2050
2000 mA
240
270
300
AΩ
65
4.2
4.2
-2%
1.15
3.15
0
40
IN_OVP
-200mV
6.3
0.42
83
1.2
0.3
3.35
175
50
100
32
IN_OVP
6.5
100
V
105
Ω
10
V
4.76
V
2%
1.25
V
V
3.5
V
mV
100 mV
160 mV
ms
IN_OVP
+200mV
V
6.7
6.8 mV
6
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