Electronic Design

Step-Down DC/DC Controller Interfaces With I²C/PMBus

linear_0829-ALinear Technology's LTC3883/-1 power system combines a synchronous step-down dc/dc controller with an I²C-based PMBus interface for digital power system management. The device allows for digital programming and read back for real-time control and monitoring of critical point-of-load converter functions. Programmable control parameters include output voltage, margining and current limits, input and output supervisory limits, switching frequency and tracking. Configurations are saved to the internal EEPROM over the device’s I²C serial interface, using the company's LTpowerPlay GUI-based development software. Applications include high current ASIC, FPGA and processor supplies in telecom, datacom, computing and storage markets. The LTC3883/-1 controller is available in a thermally enhanced 5 x 5 mm QFN-32 package, with extended temperature range grade specified over a -40°C to 105°C operating junction range. An industrial grade part is also available, specified over -40°C to 125°C. Pricing starts at $4.82 each/1000 and both versions are available from stock.


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