Analog Devices LT8606 | Demoboard DC2564A

Description

Demonstration Circuit 2564A is a 42V, 0.35A micropowersynchronous step-down regulator featuring the LT®8606.The demo board is designed for 5V output from a 5.5Vto 42V input. The wide input range allows a variety ofinput sources, such as automotive batteries and industrialsupplies. The LT8606 is a compact, high efficiency,high speed synchronous monolithic step-down switchingregulator that consumes less than 3μA of quiescentcurrent when output is regulated at 5V. Top and bottompower switches, compensation components and othernecessary circuits are inside of the LT8606 to minimizeexternal components and simplify design.The SYNC pin on the demo board is grounded by defaultfor low ripple Burst Mode® operation. Move JP1 to PULSESKIPPING position can change the operation mode topulse-skipping operation. Once JP1 is on SPREAD SPECTRUMposition, VCC is applied to the SYNC pin for lowEMI spread spectrum operation. To synchronous to anexternal clock, move JP1 to SYNC and apply the external clock to the SYNC turret. Figure 1 shows the efficiencyof the circuit.The demo board has an EMI filter installed. The radiatedEMI performances of the board (with EMI filter) are shownin Figures 2 and 3. The red/green lines in Figures 2 and3 are CISPR25 Class 5 peak/average limit. To use theEMI filter, the input should be tied to VEMI, not VIN. Aninductor L2, which is a 0Ω jumper on the board by defaultnow, can be added in the EMI filter to further reduce theconducted emission.The LT8606 data sheet gives a complete description ofthe part, operation and application information. The datasheet must be read in conjunction with this demo manualfor DC2564A.

More information

• Datasheet
• IC product information