BQ24735_17 Datasheet, PDF (37/46 Pages) Texas Instruments – 1- to 4-Cell Li+ Battery SMBus Charge Controller for Supporting Turbo Boost Mode With N-Channel Power MOSFET Selector

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bq24735
SLUSAK9B – SEPTEMBER 2011 – REVISED APRIL 2015
Layout Guidelines (continued)
The low-side MOSFET short circuit voltage drop threshold can be adjusted through SMBus command.
ChargeOption() bit [7] =0, 1 sets the low-side threshold, 135 mV and 230 mV, respectively. The high-side
MOSFET short circuit voltage drop threshold can be adjusted through SMBus command. ChargeOption() bit [8] =
0, 1 disables the function and set the threshold, 750 mV, respectively. For a fixed PCB layout, host should set
proper short-circuit protection threshold level to prevent unintentional charger shutdown in normal operation.
12.2 Layout Example
PHASE
L1 R1
V_BAT
High
V_IN
Frequency
Current
BAT
C1
Path
GND
C2
Figure 25. High-Frequency Current Path
To Inductor
Charge Current Direction
R _SNS
To Capacitor and battery
Current Sensing Direction
To SRP and SRN pin
Figure 26. Sensing Resistor PCB Layout
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