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The MAX1518 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains a
step-up switching regulator, a positive charge pump
postregulated by a high-voltage linear regulator, a negative
charge pump postregulated by a high-voltage
negative linear regulator, and five high-current operational
amplifiers. The step-up switching circuit is configured
for a +13V output (VMAIN) and provides up to
650mA from a +4.5V to +5.5V DC supply voltage.
The positive linear regulator is configured for a +25V
output (VPOS) using two charge-pump stages providing
up to 10mA. The negative linear regulator is configured
for a -8V output (VNEG) using a single chargepump
stage providing up to 15mA. The DC input
source or the step-up switching regulator output provides
power for the positive charge-pump input. The
DC input source or the power ground provides power
for the negative charge-pump input.
The MAX1518 EV kit demonstrates low-quiescent current
and high efficiency for maximum battery life.
Operation at 1.2MHz allows the use of tiny surfacemount
components.
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