Analog Devices LTC3899EFE | Demoboard DC1898A

Description

Demonstration circuit 1898A is a triple output synchronous step-up/dual step-down supply featuring the LTC3899EFE. The circuit is using a drop-in layout: the main buck circuit components fit in an area of ¾˝ × 1½˝, while the main boost circuit area is ¾˝ × 1¾˝. The package style for the LTC3899EFE is a 38-pin exposed pad TSSOP package.

The main features of the board include rail tracking (buck channels only), an internal 5V linear regulator for bias,separate RUN pins for each output, a DRVSET jumper to set the gate drive voltage and a Mode selector that allowsthe converter to run in CCM, pulse skip or Burst Mode® operation. Synchronization to an external clock is also possible.

The LTC3899EFE buck outputs are supplied from the boost output. With this boost-then-buck topology, the buck outputs maintain regulation over the entire input range. The resultant wide input voltage range of 2.5V to 60V issuitable for automotive or other battery fed applicationswhere low quiescent current is important. The LT3899EFE data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for democircuit 1898A

More information

• Datasheet
• IC product information