The MAX1531 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that provides
logic and bias power required for liquid crystal display
(LCD) monitors. The EV kit contains a step-down
switching regulator, a logic-supply linear regulator, a
source-driver-supply linear regulator, a gamma-reference
linear regulator, a two-stage positive charge
pump and linear regulator for the TFT gate-on supply,
and a one-stage negative charge pump and linear regulator
for the TFT gate-off supply. The source-driver
supply, the gamma-reference supply, the gate-on supply,
and the gate-off supply can be sequenced in any
power-up order. The EV kit also includes a MAX1522
step-up switching regulator to provide a higher output
voltage option for the source-driver supply and the
gamma reference.
The EV kit produces the output voltages listed in the
features column using a +10.5V to +24V input voltage
range. The input range can be reduced to +9.5V if the
included MAX1522 step-up regulator circuit is used. If
lower output voltages are acceptable, the input range
can be further reduced to +8V.
The EV kit features undervoltage protection for the
input, overcurrent protection for the step-down switching
regulator, and overload protection for the sourcedrive
linear regulator. Operation at 500kHz allows the
use of small surface-mount components. The EV kit
also evaluates the MAX1530.
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