Cost-Effective Voltage/Current Protection
BQ2970, BQ2971, BQ2972, BQ2973
SLUSBU9H – MARCH 2014 – REVISED JUNE 2021
BQ297xx Cost-Effective Voltage and Current Prot...
Description
BQ2970, BQ2971, BQ2972, BQ2973
SLUSBU9H – MARCH 2014 – REVISED JUNE 2021
BQ297xx Cost-Effective Voltage and Current Protection Integrated Circuit for SingleCell Li-Ion and Li-Polymer Batteries
1 Features
Input voltage range pack+: VSS – 0.3 V to 12 V FET drive:
– CHG and DSG FET drive output Voltage sensing across external FETs for
overcurrent protection (OCP) is within ±5 mV (typical) Fault detection
– Overcharge detection (OVP) – Over-discharge detection (UVP) – Charge overcurrent detection (OCC) – Discharge overcurrent detection (OCD) – Load short-circuit detection (SCP) Zero voltage charging for depleted battery Factory programmed fault protection thresholds
– Fault detection voltage thresholds – Fault trigger timers – Fault recovery timers Modes of operation without battery charger enabled
– NORMAL mode ICC = 4 µA – Shutdown Iq = 100 nA Operating temperature range TA = –40°C to +85°C Package:
– 6-pin DSE (1.50 mm × 1.50 mm × 0.75 mm)
PACK +
NC COUT DOUT
2. 2 k
V– BAT VSS
330
CELLP CELLN
PACK–
S
D
S
CHG
DSG
Simplified Schematic
0.1 µF
OCD Detection Accuracy (mV)
2 Applications
Tablet PCs Mobile handsets Handheld data terminals
3 Description
The BQ2970 battery cell protection device provides an accurate monitor and trigger threshold for overcurrent protection during high discharge/charge current operation or battery overcharge conditions.
The BQ2970 device provides the protection functions for Li-ion/Li-polymer cells, and monitors a...
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