TI TPS56302PWPR

The high-performance TPS56302 synchronous-buck regulator provides two supply voltages to power the core and I/O of digital signal processors. The TPS56302 is identical to the TPS56300 except that the reference voltages of the LDO and switching regulator have been reversed. The switching regulator, using hysteretic control with droop compensation, supports high current and efficiency for the I/O and other peripheral components. The LDO controller, suitable for powering the core voltage, drives an external N-channel power MOSFET and functions as an LDO regulator and as a power distribution switch. To promote better system reliability during power up, voltage sequencing and protection are controlled such that the core and I/O power up together with the same slow-start voltage. At power down, the LDO and ripple regulator are discharged towards ground for added protection. The TPS56302 also includes inhibit, slow-start, and under-voltage lockout features to aide in controlling power sequencing. A tri-level voltage identification definition (VID) sets both regulated voltages to any of 9 preset voltage pairs from 1.3 V to 3.3 V. Other voltages are possible by implementing an external voltage divider. Strong MOSFET drivers, with a typical peak current rating of 2-A sink and source are included on chip, which allows paralleling MOSFETs to be driven and allowing higher current to be controlled. The high-side driver features a floating bootstrap driver with an internal bootstrap synchronous rectifier. Many protection features are incorporated within the device to ensure better system integrity. An open-drain output power good status circuit monitors both output voltages, and is pulled low if either output falls below the threshold. An over current shutdown circuit protects the high-side power MOSFET against short-to-ground faults, while over voltage protection turns off the output drivers and LDO controller if either output exceeds its threshold. Under voltage protection turns off the high-side and low-side MOSFET drivers and the LDO controller if either output is 25% below VREF. Lossless current-sensing is implemented by detecting the drain-source voltage drop across the high-side power MOSFET while it is conducting. The TPS56302 is fully compliant with TI DSP power requirements.