Evaluation kit EVAL-LT7170-AZ is a single-phase monolithic DC/DC synchronous step-down regulator with a 2.9V or 1.5V with EXTVCC to 16V input range featuring LT®7170. The output can supply up to 20A continuous load current. The Silent Switcher® regulator structure is incorporated into the LT7170 to minimize EMI and reduce PCB layout sensitivity. It also integrates digital power system management functionality, allowing for programmability and telemetry with a PMBus/I2C compliant serial interface. Refer to the LT7170 data sheet for more detailed information.
The EVAL-LT7170-AZ evaluation board is designed for 1.0V output with a switching frequency set at 1MHz. The controlled on-time valley current-mode control with 25ns typical minimum on-time enables a high switching frequency at a low output voltage with excellent transient response in a small overall solution size.
The EVAL-LT7170-AZ has EMI filters installed for improved conducted and radiated EMI performances, which are shown in Figure 5. The red lines in Figure 5 are the CISPR32 limit for industrial application requirement. The figure shows that the circuit passes the test with a wide margin.
The EVAL-LT7170-AZ powers up to default settings and produces power based on the NVM configuration without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the power system management features of the part, download the GUI software LTpowerPlay® onto the PC and use ADI’s I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly, and store the configuration in NVM, view telemetry of voltage, current, temperature, and fault status. The NVM can be programmed up to three times.
