Analog Devices LT3973 | Demoboard DC1730A

Description

Demonstration circuit 1730A features the LT3973, a monolithicstep-down switching regulator which consumes only2.5μA quiescent current. The demo circuit is designed fora 5V, 750mA output from a 5.6V to 42V input. The wideinput range of the LT3973 allows a variety of input sourcesincluding automotive batteries and 24V industrial supplies.In order to reduce the number of components and solutionsize, the catch diode and boost diode are integrated. Theswitching frequency is adjustable up to 2.2MHz. At lightloads, the regulator operates in Burst Mode® to maintainhigh efficiency and low output ripple.The current mode control scheme creates fast transientresponse and good loop stability. During short circuit andovervoltage conditions, the catch diode current is limitedto protect the part. Users can populate R7 and R8 on theEN/UVLO pin to provide a programmable under voltagelockout. In addition, the shutdown feature can be utilizedby placing jumper JP1 in the OFF position.The LT3973 data sheet gives a complete description of thepart, operation and application information. The data sheetmust be read in conjunction with this quick start guide forworking on or modifying the demo circuit 1730A.

More information

• Datasheet
• IC product information