DC1730A

LINEAR TECHNOLOGY DC1730A Demonstration Board for 42V, 750mA Step-Down Regulator with 2.5μA Quiescent Current

The demonstration board features LT3973 monolithic step down switching regulator which consumes only 2.5µA quiescent current. The board is designed for a 5V, 750mA output from a 5.6V to 42V input. The wide input range of the LT3973 allows a variety of input sources including automotive batteries and 24V industrial supplies. In order to reduce the number of components and solution size, the catch diode and boost diode are integrated. The switching frequency is adjustable up to 2.2MHz. At light loads, the regulator operates in burst mode to maintain high efficiency and low output ripple. The current mode control scheme creates fast transient response and good loop stability. During short circuit and overvoltage conditions, the catch diode current is limited to protect the part. Users can populate R7 and R8 on the EN/UVLO pin to provide a programmable undervoltage lockout. In addition, the shutdown feature can be utilized by placing jumper JP1 in the OFF position.

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84% efficiency

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Typical switching frequency of 600KHz

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Excellent start up and dropout performance

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Internal catch diode current limit

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Power good flag