BQ2947_17 Datasheet, PDF (16/27 Pages) Texas Instruments – Overvoltage Protection for 2-Series to 4-Series Cell Li-Ion Batteries with External Delay Capacitor

bq2947
SLUSB15F – SEPTEMBER 2012 – REVISED JANUARY 2017
10 Power Supply Recommendations
The maximum power of this device is 20 V on V_DD.
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11 Layout
11.1 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 CD should be placed close to the IC 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 fuse blown event.
11.2 Layout Example
Place the RC filters close to the
device terminals
Power Trace Line
VCELL3
VCELL 2
VCELL 1
VDD
V4
V3
PWPD
V2
OUT
CD
VSS
V1
Pack +
Pack -
Ensure trace can support sufficient current
flow for fuse blow
Figure 19. Layout Example
16
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