BQ40Z50-R2 Datasheet, PDF (9/51 Pages) Texas Instruments – 1-Series, 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager

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bq40z50-R2
SLUSCS4 – JUNE 2017
7.6 Power Supply Control
Typical values stated where T_A = 25°C and VCC = 14.4 V, Min/Max values stated where T_A = –40°C to 85°C and VCC =
2.2 V to 26 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP
MAX UNIT
V_{SWITCHOVER–}
BAT to V_CC
switchover
voltage
V_BAT < V_{SWITCHOVER–}
1.95
2.1
2.2 V
V_SWITCHOVER+
V_CC to BAT
switchover
voltage
V_BAT > V_{SWITCHOVER–} + V_HYS
2.9
3.1
3.25 V
V_HYS
Switchover
voltage hysteresis
V_SWITCHOVER+ – V_{SWITCHOVER–}
1000
mV
BAT pin, BAT = 0 V, VCC = 25 V, PACK = 25 V
1
I_LKG
Input Leakage
current
PACK pin, BAT = 25 V, VCC = 0 V, PACK = 0 V
BAT and PACK terminals, BAT = 0 V, VCC = 0 V, PACK
= 0 V, PBI = 25 V
1 _µA
1
7.7 AFE Power-On Reset
Typical values stated where T_A = 25°C and VCC = 14.4 V, Min/Max values stated where T_A = –40°C to 85°C and VCC =
2.2 V to 26 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
V_REGIT–
Negative-going
voltage input
V_REG
1.51
1.55
1.59 V
V_HYS
Power-on reset
hysteresis
V_REGIT+ – V_REGIT–
70
100
130 mV
t_RST
Power-on reset
time
200
300
400 µs
7.8 AFE Watchdog Reset and Wake Timer
Typical values stated where T_A = 25°C and VCC = 14.4 V, Min/Max values stated where T_A = –40°C to 85°C and VCC =
2.2 V to 26 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP
MAX UNIT
t_WDT
t_WAKE
t_FETOFF
AFE watchdog
timeout
AFE wake timer
FET off delay after
reset
t_WDT = 500
t_WDT = 1000
t_WDT = 2000
t_WDT = 4000
t_WAKE = 250
t_WAKE = 500
t_WAKE = 1000
t_WAKE = 512
t_FETOFF = 512
372
744
1488
2976
186
372
744
1488
409
500
1000
2000
4000
250
500
1000
2000
512
628
1256
ms
2512
5024
314
628
ms
1256
2512
614 ms
7.9 Current Wake Comparator
Typical values stated where T_A = 25°C and VCC = 14.4 V, Min/Max values stated where T_A = –40°C to 85°C and VCC =
2.2 V to 26 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
V_WAKE
V_WAKE(DRIFT)
Wake voltage
threshold
Temperature drift
of V_WAKE accuracy
V_WAKE = ±0.625 mV
V_WAKE = ±1.25 mV
V_WAKE = ±2.5 mV
V_WAKE = ±5 mV
±0.3 ±0.625
±0.6 ±1.25
±1.2
±2.5
±2.4
±5.0
0.5%
±0.9
±1.8
mV
±3.6
±7.2
°C
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