Current triple synchronous step-down converter with I2C controlled dynamic voltage scaling

The Texas Instruments TPS65263-1Q1 incorporates triple-synchronous buck converters with 4V to 18V wide input voltage. The converter with constant frequency peak current mode is designed to simplify its application while giving designers options to optimize the system according to targeted applications. The switching frequency of the converters is adjustable from 200kHz to 2.3MHz with an external resistor. 180-degrees out-of-phase operation between buck1 and buck2, buck3 (buck2 and buck3 run in phase) minimizes the input filter requirements. The initial startup voltage of each buck can be set with external feedback resistors. The output voltage of buck2 can be dynamically scaled from 0.68V to 1.95V in 10mV steps with I2C-controlled 7bits VID. The VID voltage transition slew rate is programmable with 3bits control through I2C bus to optimize overshoot/undershoot during VID voltage transition. Each buck in the device can be I2C controlled for enabling/disabling output voltage, setting the PSM or FCC mode at light load condition and reading the power-good status, overcurrent warning, and die temperature warning. The devices features overvoltage, overcurrent, short-circuit, and overtemperature protection.