Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
• +10.8V to +13.2V, 3A DC power supply
• Digital multimeters (DMMs)
Procedure
The MAX17014 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1) Connect the positive terminal of the DC power sup-
ply to the VIN pad. Connect the negative terminal of
the DC power supply to the PGND pad.
2) Preset the power supply to +12V and disable the
output.
3) Verify that the jumpers follow the default settings in
Table1.
4) Turn on the power supply.
5) Verify that the step-down regulator output (OUT) is
+3.3V.
6) Verify that the step-up regulator output (AVDD) is
+16V.
7) Verify that the gate-on supply (VGON) is +35V.
8) Verify that the gate-off supply (VGOFF) is -6V.
9) Verify that the op-amp outputs (VCOM1, VCOM2)
are +8V.
Detailed Description
The MAX17014 EV kit evaluates the MAX17014 multiple-
output power-supply IC, which is designed primarily for
TFT LCD panels used in monitors and TVs. The EV kit
contains a step-down switching regulator to generate
the logic supply rail, a step-up switching regulator to
generate the source driver supply, and two charge-
pump regulators to generate the gate driver supplies.
The EV kit also includes two high-performance op amps
designed to drive the LCD back plane (VCOM).
Although the IC specifies a +8V to +16.5V input range,
the EV kit is optimized for +10.8V to +13.2V input supply.
Jumper Selection
Several jumper settings in the following tables illustrate
features of the MAX17014 EV kit.
Switching Frequency Selection (FSEL)
The step-down and step-up regulators on the MAX17014
EV kit switch at the same frequency, but are 180° out-of-
phase with each other. The EV kit features a 2-pin jumper
(JU1) to select the operating frequency. The EV kit is
optimized for 1.2MHz switching frequency; proper oper-
ation at 600kHz may require component changes. Table
2 lists the selectable JU1 jumper options.
High-Voltage Switch Mode (MODE)
The MAX17014 EV kit features an option to select the
operating mode (delay or no delay) for the high-voltage
switches. On the rising edge of the CTL pin, GON con-
nects to SRC. On CTL’s falling edge, GON may con-
nect immediately to DRN (no delay), or GON may con-
nect to DRN after a delay set by capacitor C9. Refer to
the
High-Voltage Switch Control
section in the
MAX17014 IC data sheet for a more detailed descrip-
tion of the two modes of operation. Jumper JU2 selects
the high-voltage switch mode for the MAX17014. Table
3 lists the selectable JU2 jumper options.
Step-Down and Negative Charge-Pump
Regulator Enable Input (EN1)
The MAX17014 EV kit features a jumper (JU3) to con-
trol the step-down and negative charge-pump regulator
enable input (EN1). By default, a shunt is installed
across JU3 to provide EN1 logic-high. When EN1 is
Evaluates: MAX17014
MAX17014 Evaluation Kit
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