Cypress CY4603, User Manual

Page: 61 / 94

HX3 Kits User Guide, Doc. #: 001-91203 Rev. *D 61
Hardware
5.1.3 Functional Description
5.1.3.1 Power Supply
This section describes the hardware circuit implemented on the CY4609 RDK hardware to supply
the required 5-V, 3.3-V, and 1.2-V power supplies, as shown in
Figure 5-2 . It also describes the cir-
cuit implemented to monitor and control overcurrent conditions on downstream ports.
Figure 5-2. Power Regulators for 3.3-V and 1.2-V Power Domains
HX3 (CYUSB3304-68LTXC) requires four power domains, as detailed in Table 5-1 .
These power domains can be served using two power supplies (3.3 V and 1.2 V). The CY4609 RDK
is designed to support these power supplies using two independent DC-DC regulators. The 5-V sup-
ply from the AC-DC adapter is fed to a 5-V-to-3.3-V DC-DC regulator (AOZ1021AI) to create a 3.3-V
supply. The output from this regulator is fed to a 3.3-V-to-1.2-V DC-DC regulator (SC189CSKTRT) to
create a 1.2-V supply.
The DC jack used on the RDK supports the AC-DC adapter with a center-positive configuration. If an
AC-DC adapter with a center-negative configuration is connected to the RDK, the blocking diode of
the MOSFET (Q1) provides reverse-polarity protection and avoids damage to the hardware.
The power LED (PWR) is connected on the input 5-V line and glows continuously when a 5-V supply
is provided to the hardware.
Table 5-1. HX3 Power Domains
Parameter Description Min Typical Max Unit
AVDD12 1.2-V Analog supply 1.14 1.2 1.26 V
DVDD12 1.2-V Core supply 1.14 1.2 1.26 V
AVDD33 3.3-V Analog supply 3 3.3 3.6 V
VDDIO 3.3-V I/O supply 3 3.3 3.6 V
GREEN
(3A)
(1.2A)
3.3V @ 3A REGULATOR
1.2V @ 1.5A REGULATOR
5V@5A DC INPUT
5V @ 5A ADAPTER INPUT
Jumper for Current
Consumption Measurement
V1p2
VCC_5V
V3p3
V3p3
R4
7.5K
TP6
TP5
C1
2.2nF
TP1
C89
0.1UF_16V
C7
22uF_6.3V
TP13
R5
10K
L1
4.7uH
+
C4
22uF_16V
R7
2.4K
+ C87
10UF_16V
U3
SC189CSKTRT
GN
D
2
IN1
1
EN
3
VOUT
4
LX
5
R2
7.5K
C5
22uF_10V
J2
HDR_1X2
1 2
TP10
G
D S
Q1
SUD50P04-09L-E3
3
1
4
R6
150R
C6
10uF_10V
J1
PJ-102BH
2
3
1
U2
AOZ1021AI
PG
N
D
1
VIN
2
EN
6
LX1
7
LX2
8
FB
4
COMP
5
AG
N
D
3
L3
2.2uH
PWR
LTST-C190KGKT