2 System Overview
Table 2-1 lists the key system specifications of this design.
Table 2-1. Key System Specifications
Parameter Conditions Spec Range Unit
Minimum Typical Maximum
Cell architecture BQ76942 3 10 Series
BQ769142 3 14 Series
BQ76952 3 16 Series
Cell balancing peak current Cell voltage: 4000 mV 117 mA
Charge current 27 A
Discharge current 27 A
Pre-discharge current Pack voltage: 48 V 160 mA
Cell Voltage accuracy 25°C ±5 mV
0°C–60°C ±10 mV
Pack current accuracy < 2 A ±10 mA
> 2 A ±0.5 %
Primary OV protection Threshold 4200 mV
Delay 2 s
Secondary OV protection Threshold 4325 mV
Delay 1 s
Primary UV protection Threshold 2530 mV
Delay 2 s
Secondary UV protection Threshold 2250 mV
Delay 1 s
OCD protection - level 1 Threshold 10 A
Delay 425 ms
OCD protection - level 2 Threshold 30 A
Delay 56 ms
OCC protection Threshold 10 A
Delay 425 ms
SCD protection Threshold 200 A
Delay 300 µs
Over temperature protection Charge 55 °C
Discharge 60 °C
Under temperature protection Charge 0 °C
Discharge –20 °C
Maximum pack+ voltage Charge MOSFET off 120 V
Standby mode current consumption 100 µA
Ship mode current consumption 10 µA
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TIDUEY5 – JANUARY 2021
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