LT8618
LT8618-3.3
LT8618C

Demonstration circuit 2822A features the LT8618, a high efficiency 65V, 100mA synchronous step-down regulator. The DC2822A demo board is designed for 100mA at 5V output from a 5.5V to 60V input with switching frequency of 2MHz. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8618 is a high efficiency, and high frequency synchronous monolithic step-down switching regulator in a 3mm × 2mm DFN package with exposed pads for low thermal resistance. The regulator’s ultralow 2.5μA quiescent current with the output in full regulation enables applications requiring highest efficiency at very light load currents, such as automotive and battery powered portable instruments.

Peak current mode control with minimum on-time of as small as 35ns allows high step-down conversion even at high frequency. The LT8618 switching frequency can be programmed via an oscillator resistor over a 200kHz to 2.2MHz range. The default frequency of the DC2822A is 2MHz.

The DC2822A demo board has an EMI filter installed. The EMI performance of the board is shown on Figure 2. The red line in radiated EMI performance is CISPR25 Class 5 peak limit. The figure shows that the circuit passes the test with a wide margin.

The LT8618 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo manual. The layout recommendations for best thermal performance are available in the data sheet Application Information section. Contact ADI applications engineer for technical support.

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 INTV_CC 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.

Demonstration circuit SCP-LT8618-BEVALZ is a high efficiency 60V, 100mA synchronous step-down regulator. The wide input range also allows output voltage inversion by using the SCP-LT8618-IEVALZ version of this board.

Like all boards in the Signal Chain Power series, this board is designed to be easily plugged into other SCP boards to form a complete signal chain power system, enabling fast evaluation of low power signal chains. To evaluate this board, some universal SCP hardware is required, namely:

To properly evaluate SCP series demo boards, you will need the SCP Configurator companion software. SCP Configurator can help you choose the right board and topology for your design.

Note that the Demo Manual does not cover details important to the operation and configuration regarding the LT8618. Please refer to the LT8618 datasheet for a complete description of the part.

Demonstration circuit SCP-LT8618-BEVALZ is a high efficiency 60V, 100mA synchronous step-down regulator. The wide input range also allows output voltage inversion by using the SCP-LT8618-IEVALZ version of this board.

Like all boards in the Signal Chain Power series, this board is designed to be easily plugged into other SCP boards to form a complete signal chain power system, enabling fast evaluation of low power signal chains. To evaluate this board, some universal SCP hardware is required, namely:

To properly evaluate SCP series demo boards, you will need the SCP Configurator companion software. SCP Configurator can help you choose the right board and topology for your design.

Note that the Demo Manual does not cover details important to the operation and configuration regarding the LT8618. Please refer to the LT8618 datasheet for a complete description of the part.