BQ2970 Datasheet, PDF (7/31 Pages) Texas Instruments – Cost-Effective Voltage and Current Protection Integrated Circuit

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bq2970, bq2971, bq2972, bq2973
SLUSBU9C – MARCH 2014 – REVISED MARCH 2016
Programmable Fault Detection Thresholds (continued)
Release of
V_OCD
V_OCC
Release of
V_OCC
V_SCC
V_SCCR
PARAMETER
CONDITION
Release of discharging
overcurrent detection voltage
Release when BAT – V– > 1 V
Charging overcurrent detection Factory Device Configuration: –45 mV to ^{TA = 25°C}
voltage
–155 mV in 5-mV steps
T_A = –40°C to
85°C
Release of overcurrent
detection voltage
Release when VSS – V– ≥ OCC (min)
Short Circuit detection voltage
Factory Device Configuration: 300 mV,
400 mV, 500 mV, 600 mV
T_A = 25°C
Release of Short Circuit
detection voltage
Release when BAT – V– ≥ 1 V
MIN
–10
–15
–100
TYP MAX UNIT
1
V
10 mV
15 mV
40
mV
100 mV
1
V
7.7 Programmable Fault Detection Timer Ranges
PARAMETER
CONDITION
t_OVPD
t_UVPD
Overcharge detection delay time
Over-discharge detection delay
time
Factory Device Configuration: 0.25 s, 1 s, 1.25 s, 4.5 s
Factory Device Configuration: 20 ms, 96 ms, 125 ms, 144
ms
t_OCDD
Discharging overcurrent detection
delay time
Factory Device Configuration: 8 ms, 16 ms, 20 ms, 48 ms
t_OCCD
Charging overcurrent detection
delay time
Factory Device Configuration: 4 ms, 6 ms, 8 ms, 16 ms
t_SCCD Short Circuit detection delay time 250 µs (fixed)
MIN
–20%
–20%
–20%
–20%
–50%
TYP MAX UNIT
20% s
20% ms
20% ms
20% ms
50% µs
7.8 Typical Characteristics
0.050
0.045
0.040
0.035
0.030
0.025
0.020
0.015
0.010
0.005
0.000
±40 ±20 0
V_BAT = 1.5 V
20 40 60
Temperature (ƒC)
80 100 120
C001
6
5
4
3
2
1
0
±40
±20 0 20 40 60
Temperature (ƒC)
V_BAT = 3.9 V
80 100 120
C002
Figure 1. 1.5-V I_BAT Versus Temperature
Figure 2. 3.9-V I_BAT Versus Temperature
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