BQ24707 Datasheet, PDF (6/36 Pages) Texas Instruments – 1-4 Cell Li+ Battery SMBus Charge Controller With Independent Comparator and Advanced Circuit Protection

bq24707
bq24707A
SLUSA78B – JULY 2010 – REVISED MARCH 2011
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ELECTRICAL CHARACTERISTICS (continued)
4.5 V ≤ V_(VCC) ≤ 24 V, 0°C ≤ T_J ≤ 125°C, typical values are at T_A = 25°C, with respect to GND (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
CHARGE UNDER-CURRENT COMPARATOR (CHG_UCP)
V_{UCP_FALL}
Charge under current falling threshold
LIGHT LOAD COMPARATOR (LIGHT_LOAD)
V_SRP falling towards V_SRN
1
5
9
V_{LL_FALL}
Light load falling threshold
V_{LL_RISE_HYST}
Light load rising hysteresis
BATTERY LOWV COMPARATOR (BAT_LOWV)
Measure voltage drop across current sensing resistor
1.25
Measure voltage drop across current sensing resistor
1.25
V_{BATLV_FALL}
Battery LOWV falling threshold
V_{BATLV_RHYST}
Battery LOWV rising hysteresis
I_BATLV
Battery LOWV charge current limit
THERMAL SHUTDOWN COMPARATOR (TSHUT)
V_SRN falling
V_SRN rising
10mΩ current sensing resistor
2.4
2.5
2.6
200
0.5
T_SHUT
Thermal shutdown rising temperature
Temperature rising
155
T_{SHUT_HYS}
Thermal shutdown hysteresis, falling
Temperature falling
20
ILIM COMPARATOR
V_{ILIM_FALL}
ILIM as CE falling threshold
V_{ILIM_RISE}
ILIM as CE rising threshold
LOGIC INPUT (SDA, SCL)
V_ILIM falling
V_ILIM rising
60
75
90
90
105
120
V_{IN_ LO}
Input low threshold
V_{IN_ HI}
Input high threshold
I_{IN_ LEAK}
Input bias current
LOGIC OUTPUT OPEN DRAIN (ACOK, SDA, IFAULT, CMPOUT)
V=7V
0.8
2.1
–1
1
V_{OUT_ LO}
Output saturation voltage
I_{OUT_ LEAK}
Leakage current
ANALOG INPUT (ACDET, ILIM)
5 mA drain current
V=7V
500
–1
1
I_{IN_ LEAK}
Input bias current
V=7V
ANALOG INPUT (CMPIN has 50kΩ series resistor and 2000kΩ pull down resistor)
–1
1
I_{IN_LEAK}
Input bias current
PWM OSCILLATOR
V=7V
1
3.5
7
F_SW
PWM switching frequency
F_SW+
PWM increase frequency
F_SW–
PWM decrease frequency
PWM HIGH SIDE DRIVER (HIDRV)
ChargeOption() bit [9] = 0 (default)
ChargeOption() bit [10:9] = 11
ChargeOption() bit [10:9] = 01
600
750
900
665
885
1100
465
615
765
R_{DS_HI_ON}
High side driver (HSD) turn-on resistance
R_{DS_HI_OFF}
High side driver turn-off resistance
V_{BTST_REFRESH}
Bootstrap refresh comparator threshold voltage
PWM LOW SIDE DRIVER (LODRV)
V_BTST – V_PH = 5.5 V, I = 10mA
V_BTST – V_PH = 5.5 V, I = 10mA
V_BTST – V_PH when low side refresh pulse is requested
12
20
0.65
1.3
3.85
4.3
4.7
R_{DS_LO_ON}
Low side driver (LSD) turn-on resistance
R_{DS_LO_OFF}
Low side driver turn-off resistance
PWM DRIVER TIMING
V_REGN = 6 V, I = 10 mA
V_REGN = 6 V, I = 10 mA
15
25
0.9
1.4
t_{LOW_HIGH}
Driver dead time from low side to high side
20
t_{HIGH_LOW}
Driver dead time from high side to low side
20
INTERNAL SOFT START
I_STEP
Soft start step size
t_STEP
Soft start step time
INDEPENDENT COMPARATOR ⁽²⁾
In CCM mode, 10mΩ current sense resistor
64
In CCM mode, 10mΩ current sense resistor
240
V_{IC_REF1}
V_{IC_REF2}
R_S
R_DOWN
Comparator reference
Comparator reference
Series resistor
Pull down resistor
ChargeOption() bit [4] = 0, rising edge (default)
ChargeOption() bit [4] = 1, rising edge
0.585
2.375
0.6
2.4
50
2000
0.615
2.425
(2) User can adjust threshold via SMBus ChargeOption() REG0x12.
UNIT
mV
mV
mV
V
mV
A
°C
°C
mV
mV
V
V
μA
mV
μA
μA
μA
kHz
kHz
kHz
Ω
Ω
V
Ω
Ω
ns
ns
mA
μs
V
V
kΩ
kΩ
6
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