LAN9730 Datasheet, PDF (27/222 Pages) SMSC Corporation – High-Speed Inter-Chip (HSIC) USB 2.0

LAN9730/LAN9730i
3.0 POWER CONNECTIONS
The LAN9730/LAN9730i can be operated with the internal core regulator enabled or disabled. Figure 3-1 illustrates the
power connections for operating the device with the internal regulator enabled. Figure 3-2 illustrates the power connec-
tions for operating the device with the internal regulator disabled. In this mode, +1.2 V must be supplied to the device
by an external source.
FIGURE 3-1:
POWER CONNECTIONS - INTERNAL REGULATOR ENABLED
LAN9730/LAN9730i
+3.3 V
56-PIN VQFN
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
51 VDD33IO
25 _VDD33IO
35 _VDD33IO
48 _VDD33IO
52 _VDD33IO
0.5 A
120 Ohm @
100 MHz
0.1 µF
0.1 µF
0.1 µF
4 _VDD33A
8 _VDD33A
15 _VDD33A
+3.3 V
49 _{CORE_REG_EN}
Internal 1.2 V Core
Regulator
ENABLED
+3.3 V (IN)
+1.2 V (OUT)
VDD12CORE
50
1 µF
0.1 µF
Core Logic
VDD12CORE ₂₁
0.1 µF
PLL
&
Ethernet PHY
HSIC
USB PHY
VDD12PLL 9
VDD12USBPLL 17
0.5 A
120 Ohm @
100 MHz
0.1 µF
0.5 A
120 Ohm @
100 MHz
0.1 µF
VDD12A
VSS
0.5 A
120 Ohm @
100 MHz
12
Exposed Pad
0.1 µF
 2012-2015 Microchip Technology Inc.
DS00001946A-page 27