Evaluates: MAX9552
MAX9552 Evaluation Kit
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Quick Start
Recommended Equipment
• 7V to 20V, 5ADC power supply (VDD)
• One voltmeter
Procedure
The MAX9552 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Use low-impedance cables to connect the
power supply to the VDD and GND pads on the EV kit.
Do not turn on the power supply until all connections
are completed.
1) Set the power-supply output to 16V and turn off the
power supply.
2) Connect the power-supply ground to the GND pad
on the EV kit.
3) Connect the power-supply output to the VDD pad
on the EV kit.
4) Turn on the power supply.
5) Verify that all the outputs (OUTA, OUTB, OUTC, and
OUTD) are approximately 8V.
6) Use low-impedance cables when connected to
external loads.
Detailed Description
The MAX9552 EV kit is a fully assembled and tested
surface-mount PCB that contains a MAX9552 IC. The
MAX9552 is a quadruple high-current VCOM buffer for
driving TFT LCDs. Each buffer is capable of sourcing or
sinking large transient load current to quickly restore
the VCOM voltage, making the MAX9552 an ideal
buffer for driving large capacitive loads in TFT LCDs.
The MAX9552 EV kit outputs (OUTA, OUTB, OUTC, and
OUTD) are set to V
DD
/ 2 by voltage-divider resistors
R1–R8, respectively. To set the outputs to other volt-
ages (from 2V to V
DD
- 2V), select different voltage-
divider resistors.
The MAX9552 EV kit provides four test points (INA-,
INB-, INC-, and IND-) to accept external feedback from
a remote-sense node, and then applies it to the nega-
tive input terminals of the buffers. To use external feed-
back sensing, cut open the PCB trace that runs directly
between the respective negative input test point and
the output pad, and connect the external feedback
sense line to the selected test point (INA-, INB-, INC-,
and IND-).
