Simplified Block Diagram
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- LCD Monitors
- Notebook Displays
The EV kit operates from a +2.2V to +5.5V DC supply voltage. The step-up switching regulator is configured for a +8.5V output, providing at least 330mA from 3.0V. The positive charge pump is configured for a +23V output providing at least 20mA. The negative charge pump is configured for a -8V output providing at least 20mA. The high-speed operational amplifier is configured for +4.25V, capable of providing up to ±150mA peak. The high-voltage switch can be used to delay the output of the positive charge pump's startup. The delay time is set with an external capacitor.
The MAX8758 EV kit demonstrates low quiescent current and high efficiency for maximum battery life. Operation at 1.2MHz allows the use of tiny surface-mount components. The MAX8758 TQFN package (0.8mm maximum height) with low-profile external components allows this circuit to be less than 1.25mm high.