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
illustrates the power connections for the USB3813 with various power supply configurations.
Single Supply Application
3.3V Internal
Logic
VBAT/+3.3V
Supply
3.3V Regulator
VBAT
4.7uF
(IN)
(OUT)
1.2V Regulator
(IN)
(OUT)
3.3V I/O
1.2V
Core Logic
HSIC
USB3813
GND
VDD33
1.0uF
VDDCOREREG
VDDCR12
1.0uF
Dual Supply Application (3.3V & 1.8V)
3.3V Internal
Logic
+3.3V
Supply
3.3V Regulator
(IN)
(OUT)
1.2V Regulator
(IN)
(OUT)
3.3V I/O
1.2V
Core Logic
HSIC
VBAT
4.7uF
USB3813
GND
VDD33
1.0uF
VDDCOREREG
+1.8V
Supply
VDDCR12
1.0uF
Figure 4.1 Power Connections
Revision 1.0 (06-17-13)
18
SMSC USB3813
DATASHEET
SMSC [ SMSC CORPORATION ]
