TPS53126 Step-Down Controllers Texas Instruments TPS53126 Step-Down Controllers feature D-CAP2™ Mode Control with the fast transient response and no external parts required for loop compensation. The TI TPS53126 also has a proprietary circuit that enables the devices to adapt to low ESR output capacitors and ultra-low ESR ceramic capacitors. The TI TPS53126 step-down controller has a wide input voltage range of 4.5V to 24V and an output voltage range of 0.76V to 5.5V.