BQ24735 Datasheet, PDF (8/42 Pages) Texas Instruments – 1-4 Cell Li+ Battery SMBus Charge Controller for Supporting Turbo Boost Mode with N-Channel Power MOSFET Selector

bq24735
SLUSAK9 – SEPTEMBER 2011
www.ti.com
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
INPUT OVER-CURRENT COMPARATOR (ACOC)⁽²⁾
V_ACOC
Adapter over current rising threshold with
respect to input current limit, voltage
across input sense resistor rising edge
ChargeOption() bit [1] = 1 (Default)
ChargeOption() bit [1] = 0 Disable function
300% 333% 366%
V_{ACOC_min}
Min ACOC threshold clamp voltage
ChargeOption() Bit [1] = 1 (333%),
InputCurrent () = 0x0400H (10.24mV)
40
45
50
V_{ACOC_max}
Max ACOC threshold clamp voltage
ChargeOption() Bit [1] = 1 (333%),
InputCurrent () = 0x1F80H (80.64mV)
135
150
165
t_{ACOC_DEG}
ACOC deglitch time (Specified by design)
Voltage across input sense resistor rising to disable
charge
2.3
4.2
6.6
BAT OVER-VOLTAGE COMPARATOR (BAT_OVP)
V_{OVP_RISE}
Over voltage rising threshold as
percentage of V_{BAT_REG}
V_{OVP_FALL}
Over voltage falling threshold as
percentage of V_{BAT_REG}
CHARGE OVER-CURRENT COMPARATOR (CHG_OCP)
V_SRN rising
V_SRN falling
103% 104% 106%
102%
V_{OCP_RISE}
Charge over current rising threshold,
measure voltage drop across current
sensing resistor
ChargeCurrent()=0x0xxxH
ChargeCurrent()=0x1000H – 0x17C0H
ChargeCurrent()=0x1800 H– 0x1FC0H
54
60
66
80
90
100
110
120
130
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 DEPLETION COMPARATOR (BAT_DEPL) [1]
Measure the voltage drop across current sensing
resistor
1.25
1.25
V_{BATDEPL_FALL}
Battery depletion falling threshold,
percentage of voltage regulation limit, V_SRN
falling
ChargeOption() bit [12:11] = 00
ChargeOption() bit [12:11] = 01
ChargeOption() bit [12:11] = 10
ChargeOption() bit [12:11] = 11 (Default)
55.53% 59.19%
58.68% 62.65%
62.17% 66.55%
66.06% 70.97%
63.5%
67.5%
71.5%
77%
ChargeOption() bit [12:11] = 00
225
305
400
V_{BATDEPL_RHYST}
Battery depletion rising hysteresis, V_SRN
rising
ChargeOption() bit [12:11] = 01
ChargeOption() bit [12:11] = 10
240
325
430
255
345
450
ChargeOption() bit [12:11] = 11 (Default)
280
370
490
t_{BATDEPL_RDEG}
Battery Depletion Rising Deglitch
(Specified by design)
Delay to turn off ACFET and turn on BATFET during
LEARN cycle
600
BATTERY LOWV COMPARATOR (BAT_LOWV)
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
10 mΩ 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)
V=7V
0.8
2.1
–1
1
V_{OUT_ LO}
I_{OUT_ LEAK}
Output saturation voltage
Leakage current
5 mA drain current
V=7V
500
–1
1
UNIT
mV
mV
ms
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
ms
V
mV
A
°C
°C
mV
mV
V
V
μA
mV
μA
(2) User can adjust threshold via SMBus ChargeOption() REG0x12.
8
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