Datasheet

Power Supply (VCC)
The MAX4983E EV kit can be powered by the P1 USB
port (through the 3.3V LDO) or by an external power sup-
ply (VIN). The on-board MAX8511 linear regulator (U2)
provides the regulated 3.3V from the USB bus voltage
(5V) provided at P1. To evaluate the board with an exter-
nal supply, configure jumper JU3 according to Table 4.
On-Board VBUS Power Switching
The EV kit includes a power-switching circuit, designed
with n-channel and p-channel MOSFETs, that routes the
P1 USB bus voltage (V1) to the P2 or P3 USB ports. The
power-switching circuit is controlled by the state of the
CB control pin, which is set through jumper JU1. See
Table 5 for operation.
Evaluates: MAX4983E/MAX4984E
MAX4983E Evaluation Kit
_______________________________________________________________________________________ 3
Table 4. Jumper JU3 Function
* Default position.
SHUNT
POSITION
VCC
SUPPLY
DESCRIPTION
1-2*
On-board
supply
Device powered by on-board
linear regulator (3.3V)
2-3
External
supply
Device powered by user-
supplied 2.8V to 5.5V power
supply connected to VIN and
GND pads
Table 5. Relay Operation (Jumper JU1)
* Default position.
SHUNT
POSITION
CB PIN DESCRIPTION
1-2*
Connected to
GND
P1 USB bus voltage (V1) routed
to USB port P2 (V2 = V1)
2-3
Connected to
VCC
P1 USB bus voltage (V1) routed
to USB port P3 (V3 = V1)
CB
V1
V2
V3
Figure 1. VBUS Power Switching