The TPS7H3302 is a 3-A sink and source LDO provides low output noise to meet system needs. In order to improve efficiency in the LDO, the TPS7H3302 LDO can operate from low VLDOIN voltage rail, thus using dual voltage source one for the VLDOIN that supports high-current and an alternate voltage sources that enables the VDDQSNS pin to track VDDQ.

In some cases VLDOIN and VDDQSNS pins are tied together. In the memory system, VDDQ is a high-current supply that powers the core, the I/O, and the logic of the memory. VTTREF is a low-current, precision reference voltage that provides a threshold between a logic high (one) and a logic low (zero) that adapts to changes in the I/O supply voltage. By providing a precision threshold that adapts to the supply voltage, VTTREF realizes wider noise margins than those possible with a fixed threshold and normal variations in termination and drive impedance. Specifications vary for different DDR technologies. For example DDR3 JEDEC JESD79-3F specifies 0.49 to 0.51 times VDDQ and draws only tens to hundreds of microamps. The TPS7H3302 VTTREF is designed to sink and source up to 10 mA.