HIP6311ACBZ

The HIP6311A Multi-Phase Buck PWM control IC is used in applications such as controlling microprocessor core voltage regulation by driving 2 to 4 synchronous-rectified buck channels in parallel. It utilizes a multi-phase buck topology to increase ripple frequency and reduce input and output ripple currents, resulting in fewer components, reduced component ratings, lower power dissipation, and a smaller implementation area .

The HIP6311A control IC detects an over-voltage condition in the system when the VSEN pin goes more than 15% above the programmed VID level. This over-voltage condition is latched, disabling normal PWM operation and causing PGOOD to go low. The latch can only be reset by lowering and returning VCC high to initiate a POR and Soft-Start sequence.

The core output voltage that can be adjusted using the HIP6311A control IC's 5-bit digital-to-analog converter ranges from 1.100V to 1.850V. This adjustment is made with an unsurpassed system accuracy of ±0.5% over temperature. The DAC allows for precision droop, channel-current balancing, load sharing, and over-current protection based on the voltage developed across the on-resistance of the lower MOSFETs during conduction, which is sampled for current sensing purposes. The PGOOD monitor feature of the control IC holds low until the core voltage increases to within 8% of the programmed voltage, and an over-voltage condition is detected when the output voltage exceeds 115% of the programmed VID, resulting in the converter shutting down and PGOOD being pulled low. During an under-voltage condition (output voltage 10% below the programmed VID), PGOOD transitions low, but the converter continues to operate.