BQ24150A Datasheet, PDF (35/41 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support

bq24150A
bq24151A
www.ti.com ..................................................................................................................................................................................................... SLUS931 – APRIL 2009
• Place 4.7µF input capacitor as close to PMID pin and PGND pin as possible to make high frequency current
loop area as small as possible. Place 1µF 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 39).
VBUS
L1
R1
SW
V _BAT
VIN
C1
PMID
C2
High
Frequency
Current
Path
PGND
BAT
C3
Figure 37. High Frequency Current Path
Charge Current Direction
R _SNS
To Inductor
To Capacitor and battery
Current Sensing Direction
To CSIN and CSOUT pin
Figure 38. Sensing Resistor PCB Layout
Vin+
Vin-
1uF
4.7uF
VBUS
PMID
SW
PGND
Figure 39. Input Capacitor Position and PCB Layout Example
Copyright © 2009, Texas Instruments Incorporated
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