MAX17075 Evaluation Kit
High-Voltage Switch Control (CTL)
Jumper JU2 configures the positions of the high-
voltage switch control pin (CTL) of the MAX17075 IC.
The CTL pin can be controlled by an external logic con-
troller connected to the EV kit’s CTL pad. Remove the
shunt from jumper JU2 before connecting an
external controller to the CTL pad. See Table 2 for JU2
shunt positions.
Step-Up Regulator, Output-Voltage Selection section in
the MAX17075 IC data sheet for instructions on select-
ing resistors R8 and R9.
Positive Charge-Pump Output (SRC)
The positive charge-pump output (SRC) is set to +30V
by voltage-divider resistors R15 and R16. To set SRC to
other voltages (up to approximately 3xAVDD, limited to
+36V), select different voltage-divider resistors. Refer to
the Design Procedure, Charge-Pump Regulators,
Output-Voltage Selection section in the MAX17075 IC
data sheet for instructions on selecting resistors R15
and R16.
High-Voltage Switch Output (VGON)
Dummy Load
The MAX17075 EV kit features a capacitive dummy
load of 1500pF (C18) at the VGON output pad to simu-
late a TFT panel load to test the switch array. When
testing with an actual LCD panel, disconnect the
dummy load. Jumper JU3 connects and disconnects
the dummy load. Table 3 lists the selectable JU3
jumper options.
Negative Charge-Pump Output (VGOFF)
The negative charge-pump output (VGOFF) is set to
-7V by voltage-divider resistors R6 and R7. To set
VGOFF to other voltages (from 0 to -AVDD approxi-
mately), select different voltage-divider resistors. Refer
to the Design Procedure, Charge-Pump Regulators,
Output-Voltage Selection section in the MAX17075 IC
data sheet for instructions on selecting resistors R6 and
R7.
Output-Voltage Selection
Step-Up Switching Regulator Output Voltage
(AVDD)
Evluates:MAX1075
The MAX17075 EV kit’s step-up switching-regulator out-
put (AVDD) is set to +13V by feedback resistors R8 and
R9. To generate output voltages other than +13V (up to
+18V), select different voltage-divider resistors.
Operation at significantly higher output voltages could
reduce the available output current, and require
changes in component values or voltage rating for
capacitors C3 and C4. Refer to the Design Procedure,
Op-Amp Output (OUT)
The op-amp output (OUT) is set to +6.5V by voltage-
divider resistors R3 and R4. To set the outputs to other
voltages (from 0 to AVDD), select different voltage-
divider resistors.
Table 2. JU2 Jumper Selection (CTL)
SHUNT POSITION
CTL PIN CONNECTED TO
HIGH-VOLTAGE SWITCH CONFIGURATION
COM pin connected to SRC pin
COM pin disconnected from DRN pin
Installed
VIN
COM pin connected to DRN pin
COM pin disconnected from SRC pin
Not installed*
None
GND through resistor R5
CTL driven by external logic controller
CTL high: COM pin connected to SRC pin
CTL low: COM pin connected to DRN pin
External logic controller
through the CTL pad
*Default position.
Table 3. JU3 Jumper Selection (C18)
SHUNT POSITION
VGON
OPERATION
Dummy load testing
Installed
Connected to C18
Not connected to C18
Not installed*
Normal operation, no load
*Default position.
4
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