USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications
Datasheet
4.2.2.2
3.3V + 1.8V
VBAT must be tied to the 3.3V system supply. VDDCOREREG must be tied to the 1.8V system supply.
In this configuration the 3.3V regulator will operate in dropout mode and the 1.2V regulator will be
active.
4.3
Power Connection Diagrams
Figure 4.1 illustrates the power connections for the USB3813 with various power supply configurations.
Single Supply Application
HSIC
3.3V Internal
Logic
1.2V
Core Logic
3.3V I/O
VBAT/+3.3V
Supply
3.3V Regulator
1.2V Regulator
VBAT
(IN)
(OUT)
(IN)
(OUT)
4.7uF
USB3813
GND
VDD33
VDDCOREREG
VDDCR12
1.0uF
1.0uF
Dual Supply Application (3.3V & 1.8V)
HSIC
3.3V Internal
Logic
1.2V
Core Logic
3.3V I/O
+3.3V
Supply
3.3V Regulator
1.2V Regulator
VBAT
(IN)
(OUT)
(IN)
(OUT)
4.7uF
USB3813
GND
VDD33
VDDCOREREG
VDDCR12
1.0uF
+1.8V
Supply
1.0uF
Figure 4.1 Power Connections
Revision 1.0 (06-17-13)
18
SMSC USB3813
DATASHEET
SMSC [ SMSC CORPORATION ]
