XR77103-A1R0 Universal PMIC 3 Output Buck Regulator EVB User Manual
System Set-Up
March 10, 2022
010-A1R0UMR00
5
System Set-Up
lists a summary of the jumpers and factory settings to configure the EVB for operation. For additional information,
refer to the XR77103-A1R0 data sheet.
Jumper J3
Jumper J8
Jumper J11
For operation from a 5V rail, it is required that the LDO
output is connected to V
IN
, which can be accomplished by
populating J11. This enhances the operation of the drivers
for V
IN
< 5V.
Important:
Remove J11 for operation at higher V
IN
. The
board also has Zener diode placeholders which can be
installed to protect the IC if higher V
IN
is accidentally
applied.
Table 4:
Factory Settings
Jumper
Factory Setting
Description
EN Pin
J3
Jumper 1-2
EN pin is tied to V
CC
and channels are enabled at power up.
PGOOD Pin
J8
Jumper 1-2
PGOOD is pulled up to V
CC
.
5V Operation
J11
No jumper
LDO output is not tied to
V
IN
.
VIN Connection to Individual Channels
J14, J20, J24
Jumpers installed
VIN is connected to VIN1, VIN2, and VIN3.
SYNC Pin
J15
No jumper
SYNC is not tied to GND on the board.
Table 5:
Jumper J3 Options for the EN Pin
Jumper Options
Description
Jumper 1-2 (default)
The EN (enable) pin is tied to V
CC
and channels are enabled at power up.
Jumper 2-3
The EN (enable) pin is tied to GND, permanently disabling the channels.
No jumper
The jumper is open, allowing EN to be controlled external to the board.
Table 6:
Jumper J8 Pull Up Options for the PGOOD Pin
Jumper Options
Description
Jumper 1-2 (default)
PGOOD is pulled up to the VCC pin.
No jumper
PGOOD is not pulled up by this jumper.
