A built-in transient load tester facilitates transient load tests. The MAX1778 TSSOP package (1.1mm max) with low-profile external components allows this circuit to be less than 1.2mm in height. High-frequency operation (500kHz/1MHz) allows the use of tiny surface-mount components and fast transient response. The MAX1778 EV kit demonstrates low quiescent current and high efficiency (over 91%). The step-up switching regulator output provides power to the V COM buffer. The V COM buffer provides a +4V output and more than 150mA of peak current. Power for the LDO regulator circuit is provided from the input supply. The EV kit also features an LDO linear regulator circuit, which is configured for a +2.5V output that provides more than 200mA of current. Power for both charge-pump inputs is provided from the step-up switching regulator output. The negative charge-pump circuit is configured for a -5V output and provides more than 20mA of current.
The positive charge-pump circuit is configured for a +20V output that provides more than 10mA of current. The EV kit can be powered from a +2.7V to +5.5V supply. The step-up switching circuit is configured for a +8V output that provides up to 250mA of current from a +3.0V supply. The MAX1778 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a step-up switching regulator, two charge-pump voltage-regulator circuits, a V COM buffer, and a low-drop out linear regulator (LDO). The MAX1630/MAX1631/MAX1632 EV kits can also be used to evaluate other output voltages. These circuits are configured to deliver up to 3A of output current on each of the main PWM outputs with greater than 90% efficiency. Connecting the transformer to the 5V side provides slightly better efficiency and lower stress voltages. Connecting the transformer to the 3.3V side allows lower input voltage. The main differences between the MAX1630 and MAX1632 EV boards are in the turns ratio (1:4 or 1:2.2) and in the location of the transformer connection (3.3V side or 5V side).
Double buffered parallel to serial converter Pc#
The MAX1630 and MAX1632 EV boards provide the triple-output 3.3V/5V/12V circuit, and the MAX1631 EV board provides the dual-output 3.3V/5V circuit.Īll three use the same PC board but have different components to accommodate different input voltage ranges.
The MAX1630/MAX1631/MAX1632 evaluation kits (EV kits) each consist of one of three preassembled and tested evaluation boards (EV boards) that embody the standard application circuits.
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