BQ2961_17 Datasheet, PDF (22/33 Pages) Texas Instruments – Overvoltage Protection for 2-Series, 3-Series, and 4-Series Cell Li-Ion Batteries with Regulated Output Supply

bq2961, bq2962
SLUSBU5D – NOVEMBER 2013 – REVISED JANUARY 2017
100 Ÿ
Protector ^{Pack +}
FETs
VCELL4
VCELL3
VCELL2
VCELL1
1 NŸ
1 NŸ ^{0.1 µF}
1 NŸ ^{0.1 µF}
1 NŸ ^{0.1 µF}
0.1 µF
VDD
V4 _bq2961
V3 ^bq2962
OUT
REG
VSS
V2
V1
PWPD
5 (*)
External
Circuit
e.g., RTC
0.1 µF
* can be removed if Vss
will be connected first
during cell connection
0.47 µF
Pack ±
Copyright © 2017, Texas Instruments Incorporated
Figure 24. bq2961 and bq2962 Schematic
10 Power Supply Recommendations
The maximum power is 15 V for bq2960 and 20 V for bq2961 and bq2962 on VDD.
Connect VSS first during power up.
NOTE
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11 Layout
11.1 Layout Guidelines
Use the following layout guidelines.
1. Ensure the RC filters for the Vx pins and VDD pin are placed as close as possible to the target terminal,
reducing the tracing loop area.
2. The capacitor for REG should be placed close to the device terminals.
3. Ensure the trace connecting the fuse to the gate, source of the NFET to the Pack– is sufficient to withstand
the current during a fuse blown event.
11.2 Layout Example
Place the RC filters close
to device terminals
Power Trace Line
VCELL3
VCELL2
VCELL1
VDD
OUT
V4
REG
5 (*)
V3
VSS
PWPD
V2
V1
External
Circuit
e.g., RTC
Pack +
Pack ±
22
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* can be removed if Vss
will be connected first
during cell connection
Ensure trace can support sufficient
current flow for fuse blow
Figure 25. Layout Example
Copyright © 2013–2017, Texas Instruments Incorporated
Product Folder Links: bq2961 bq2962