Datasheet

High
Frequency
Current
Path
L1
R1
C3
C1
VBUS
PMID
C2
PGND
SW
V
BAT
BAT
V
IN
ChargeCurrentDirection
ToCSINandCSOUTpin
R
SNS
ToInductor ToCapacitorandbattery
CurrentSensingDirection
PMID
SW
PGND
4.7uF
1uF
Vin+
Vin-
AGND
VBUS
PMID
SW
PGND
4.7uF
1uF
Vin+
Vin-
AGND
VBUS
bq24155
www.ti.com SLUS942 –FEBRUARY 2010
• Place 4.7uF input capacitor as close to PMID pin and PGND pin as possible to make high frequency current
loop area as small as possible. Place 1uF input capacitor as close to VBUS pin and PGND pin as possible to
make high frequency current loop area as small as possible (see Figure 25).
Figure 23. High Frequency Current Path
Figure 24. Sensing Resistor PCB Layout
Figure 25. Input Capacitor Position and PCB Layout Example
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