The TPS4030x is a family of cost-optimized synchronous buck controllers that operate from3-V to 20-V input. The controller implements a voltage-mode control architecture with input-voltagefeed-forward compensation that responds instantly to a change in input voltage. The switchingfrequency is fixed at 300 kHz, 600 kHz, or 1.2 MHz.
The frequency spread-spectrum (FSS) feature adds to the switching frequency,significantly reducing the peak EMI noise and making it much easier to comply with EMIstandards.
The TPS4030x offers design with a variety of user-programmable functions, including softstart, overcurrent protection (OCP) levels, and loop compensation.
OCP level may be programmed by a single external resistor connected from the LDRV pin tocircuit ground. During initial power on, the TPS4030x enters a calibration cycle, measures thevoltage at the LDRV pin, and sets an internal OCP voltage level. During operation, the programmedOCP voltage level is compared to the voltage drop across the low-side FET when it is on todetermine whether there is an overcurrent condition. The TPS4030x then enters a shutdown andrestart cycle until the fault is removed.