MAX8795A Evaluation Kit (MAX8795AEVKIT) (MAX8795AEVKIT)
The MAX8795A evaluation kit (EV kit) is a fully assembled and tested surface-mount printed-circuit board (PCB) 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 (op amps). The primary step-up converter is configured for a +14V output (VMAIN) and provides at least 500mA from a +4.5VDC supply voltage.
The positive and negative linear-regulator controllers postregulate the charge-pump outputs for TFT gate-on and gate-off supplies. The positive linear regulator is set to +25V output (VPOS) and provides at least 20mA. The negative linear regulator is set to -10V output (VNEG) and provides at least 50mA. Power to the positive charge-pump input comes from the step-up switching-regulator output, while power to the negative charge-pump input comes from the power ground.
The EV kit also features five high-performance op amps designed to drive the LCD backplane (VCOM). Power to the VCOM buffers comes from the step-up switching regulator output. The MAX8795A EV kit demonstrates low quiescent current and high efficiency for maximum battery life. High-frequency (1.2MHz) operation allows the use of tiny surface-mount components to minimize the thickness of LCD panel designs.
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