The uP1566 is a high performance synchronous buck controller with 1.5A source/sink LDO for memory system power. It also provides a buffered low noise reference VTTREF. The uP1566 has wide operation range from 4.5V to 26V for input voltage and 0.75V to 3.3V for memory output voltage. The synchronous buck of the uP1566 adopts uPI proprietary robust constant on-time (RCOTTM) PWM scheme that features easy-to-use, low external component count, fast transient response and quasi-constant frequency operation over the operation range. The 1.5A source/sink LDO for VTT has fast transient response, requiring only two 10uF of ceramic output capacitors. In addition, the LDO supply input is available externally to significantly reduce the total power losses. The uP1566 supports all the sleep state controls, in S3 state (suspend to RAM) VTT is disable and in S4/S5 (suspend to disk) VDDQ, VTT and VTTREF are soft off. The uP1566 has complete functions including under voltage protection, over current protection, over oltage protection, power-up sequencing, power OK output, and thermal shutdown. The uP1566 is available in WQFN3x3-20L package.