Synchronous Buck Regulator with Output Tracking and Sequencing

Intersil Corporation announced the ISL8002B synchronous buck (step-down) switching regulator that delivers up to 2A of continuous output current from a 2.7V to 5.5V input supply. The device's 2MHz switching frequency provides superior transient response, and its key features—programmable soft-start, and output tracking and sequencing of FPGAs and microprocessors—increase system reliability for point-of load conversions in networking, factory automation, instrumentation, and medical equipment.

The ISL8002B enables greater system reliability through several innovative features. For example, the regulator's output tracking and sequencing of FPGAs and MPUs ensures sensitive multi-rails properly start up and shut down. In addition, its output rails are configurable for coincidental, ratiometric, or sequential settings, ensuring the FPGA or MPU's internal ESD diodes are not biased or overstressed during rising or falling outputs. The ISL8002B's undervoltage lockout and several other protection/stability features (overvoltage, overcurrent, undercurrent, negative current, over temperature and short-circuit) safeguard the system from damage when an unwanted electrical fault event occurs. And its unique negative current protection prevents switch failure.

The ISL8002B's superior transient response and high level of integration enable a complete synchronous step-down DC/DC converter solution in less than a 0.10 inch² footprint. By integrating low R_DS(ON) high-side PMOS and low-side NMOS MOSFETs, the buck regulator eliminates the need for a bootstrap capacitor and diode, and its high efficiency allows the use of small inductors to further reduce board space.

Key Features