Analog Devices LT8618C | Demoboard DC3214A

Description

Demonstration circuit 3214A features the LT8618C, a high efficiency 65V, 100mA synchronous step-down regulator in 12-Lead 2mm . 2mm LQFN package. The demo board is designed for 100mA at 5V output from a 5.9V to 65V input, with the switching frequency programmed at 2MHz.The LT8618C is a compact high efficiency, and high frequency synchronous monolithic step-down switching regulator, with internal soft-start capacitor, compensation network, BST and INTVCC capacitors.The operation mode can be configured via the SYNC/MODE pin for forced continuous mode, Burst Mode® operation, or spread spectrum mode. The low quiescent current and high efficiency in Burst Mode make it an ideal solution for applications requiring highest efficiency at light load conditions, such as automotive housekeeping supplies, industrial sensors, flow meters, Internet of Things, and battery powered portable instruments.The demo board DC3214A has an EMI filter installed. The EMI performance of the board running in spread spectrum mode is shown in Figure 2 in the demo manual, where the red lines are CISPR25 Class 5 average limits. The circuit passes the average limit with a wide margin.The LT8618/LT8618C data sheet gives a complete description of the part, operation, and application information. The data sheet must be read in conjunction with the DC3214A demo manual. Contact ADI applications engineer for technical support.

Features

• High Efficiency Synchronous Operation

• 90% Efficiency at 30mA, 12VIN to 3.3VOUT

• Pin Selectable Forced Continuous or Burst Mode® Operation (LT8618C Only)
• Ultralow Quiescent Current Burst Mode Operation
• < 2.5μA IQ Regulating 48VIN to 3.3VOUT
• Output Ripple < 10mVP-P
• 3.4V to 60V Input Operation Range (65V Max)
• Fast Minimum Switch-On Time: 35ns
• Adjustable (All) And Synchronizable (LT8618C Only) Switching Frequency: 200kHz to 2.2MHz
• Fixed 3.3V Output Voltage Version (LT8618-3.3)
• Accurate 1V Enable Pin Threshold (All) with Adjustable Hysteresis (LT8618C Only)
• Internal Compensation
• Output Soft-Start and Tracking
• Small 12-Lead 2mm × 2mm LQFN (LT8618C) and 10-Lead 3mm × 2mm DFN Packages
• AEC-Q100 Qualified for Automotive Applications (LT8618/LT8618-3.3)

Typical applications

• Industrial Internet of Things
• 4mA to 20mA Current Loops, Flow Meters
• Automotive Housekeeping Supplies
• Industrial Sensors

More information

• Datasheet
• IC product information