P9235A-RB Layout Guide
© 2019 Integrated Device Technology, Inc
4
March 19, 2019
Figure 2. Recommended Orientation for the P9235A-RB and Generic Placement Guide for Select
Critical Components
CS
P
CS
N
VIN
Peak
Detector
VD
EM
1
Coi
l A
ss
em
bly
P9235A-RB
SW_S
LDO33
LDO18
PREG
GP
IOA
6
LE
D1
LE
D2
VIN_LDO
R
SNS
GH_BRG1
SW_BRG1
GL_BRG1
GH_BRG2
SW_BRG2
GL_BRG2
M ISO
MOSI
L
P
C
P
L
Ext.
Memory
Flash
1
SS
SCLK
Note:
1. External memory is required for the P9235A-RB.
SCL
SDA
GND
GP
IOA
2
Recommendation: Once the final shape of the production or development PCB has been determined and the connection points for the power
transfer coil (L
TX
) have been chosen, place the P9235A-RB on the board as close to the center of the PCB as possible, taking into
consideration the mechanical requirements of the system under design. Determine its orientation based on the ability to route connections
and place the required components in the following order of priority. First place the input and boost capacitors as close to their respective pins
in this order of priority: V
IN
, LDO33, LDO18, BST_BRG1, BST_BRG2, DRV_VIN, and VBRG_IN. The main power current path the connection
from V
IN
through the sense resistor (R
SNS
), through 1 of the two half bridge power FETs, through the tank capacitor, through the Tx coil (Coil
Assembly) and out through 1 of the other half bridge power FETs. Figure 2 represents the optimal orientation of the P9235A-RB relative to the
other main components. Not all necessary connections are shown in Figure 2. For a complete diagram of the recommended connections, see
the schematic in Section 5. Trace widths are not to scale.
