FAN54013_12 Datasheet, PDF (34/36 Pages) Fairchild Semiconductor – FAN54010 / FAN54011 / FAN54012 / FAN54013 / FAN54014

Table 23. Register Bit Definitions
This table defines the operation of each register bit for all IC versions. Default values are in bold text.
Bit
Name
Value Type
Description
4
T_120
3
ICHG
R
Thermal regulation comparator; when=1 and T_145=0, the charge current is limited
to 22.1 mV across R_SENSE
R 0 indicates the ICHARGE loop is controlling the battery charge current
2
IBUS
R 0 indicates the IBUS (input current) loop is controlling the battery charge current
1 VBUS_VALID
R 1 indicates VBUS has passed validation and is capable of charging
0
CV
R
1 indicates the constant-voltage loop (OREG) is controlling the charger and all
current limiting loops have released
PCB Layout Recommendations
Bypass capacitors should be placed as close to the IC as
possible. In particular, the total loop length for CMID should
be minimized to reduce overshoot and ringing on the SW,
PMID, and VBUS pins. All power and ground pins must be
routed to their bypass capacitors, using top copper whenever
possible. Copper area connecting to the IC should be
maximized to improve thermal performance if possible.
Figure 51. PCB Layout Recommendations
© 2011 Fairchild Semiconductor Corporation
FAN5401X Family • Rev. 1.0.4
34
www.fairchildsemi.com