Regulator has output tracking and sequencing for FPGAs and MPUs

March 10, 2015 // By Graham Prophet
Designed to provide a compact solution size and high frequency switching for point of load conversions, Intersil’s ISL8002B is a 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 2 MHz switching frequency optimises 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.

The ISL8002B enables greater system reliability through features such as; the regulator’s output tracking and sequencing of FPGAs and MPUs ensures sensitive multi-rails properly start up and shut down. 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. Negative current protection prevents switch failure.

The ISL8002B’s transient response and high level of integration enable a complete synchronous step-down DC/DC converter solution in less than a 0.10 in² footprint. By integrating low RDS(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.

A demonstration board is available; ($23).

In an 8-pin TDFN package the device is priced at $1 (1000).


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