Analog Devices LTC3859ALEUHF | Demoboard DC2122A

Description

Demonstration circuit 2122A is a triple output synchronous step-up/dual step-down supply featuring the LTC®3859AL. This demonstration circuit is designed for two buck 5V/5A, 8.5V/3A outputs supplied by a boosted 10V/7A output. Benefiting from this feature, the buck outputs are able tomaintain regulation over a wide input voltage range of 4.5V to 36V which is suitable for automotive or other battery fed applications. Also, the demonstration circuit uses a drop-in layout that the main buck circuit components fit in an area of ¾" by 1½", while the main boost circuit area is ¾" by 1¾". The package style for the LTC3859AL is a 38-pin exposed pad QFN package. The main features of the board include rail tracking (buckchannels only), an internal 5V linear regulator for bias, separated RUN pins for each output, a PGOOD signal (CH1 only), an overvoltage indicator for CH3 and a Mode selector that allow the converter to run in CCM, pulse skip or Burst Mode® operation. Synchronization to an external clock isalso possible. The LT3859AL data sheet gives a complete description of these parts, operation and application information.The data sheet must be read in conjunction with this quick start guide for demo circuit 2122A.

More information

• Datasheet
• IC product information