Intersil’s new ISL8002B synchronous step-down switching regulator produces up to 2A of continuous output current from a 2.7V-5.5V input supply.
The device’s 2MHz switching frequency provides excellent transient response. It uses a peak current-mode control architecture to allow for operation at very low duty cycles.
Several innovative features of the ISL8002B contribute greatly to the improvement of system reliability. For example, the regulator’s output tracking and sequencing of FPGAs and processors ensures sensitive multi-rail power supplies properly start up and shut down. In addition, its output rails are configurable for coincidental, ratiometric or sequential settings, which means that an FPGA’s or MPU’s internal ESD diodes are not biased or overstressed when outputs are rising or falling.
The ISL8002B’s under-voltage lock-out and other protection and stability features safeguard the system from damage when an unwanted electrical fault event occurs. Its unique negative-current protection prevents switch failure.
The ISL8002B’s high level of integration enables the designer to realise a complete synchronous step-down DC-DC converter in a footprint smaller than 64mm2. The regulator itself is housed in a 2mm x 2mm, 8-pin TDFN package. By integrating high-side PMOS and low-side NMOS MOSFETs that feature low onresistance, the ISL8002B eliminates the need for a bootstrap capacitor and diode, and its high efficiency allows for the use of small inductors.
Also from Intersil, the ISL85003 is a 4.5V-18V, 3A synchronous buck regulator which can be combined with the ISL8002B in a two-stage solution to convert a 12V rail to a 5V rail. The ISL85403 can also be combined in a two-stage solution with the ISL8002B to step down a 24V rail to a 5V rail.
- Industrial equipment
- Medical equipment
- Telecoms and networking equipment
- Games consoles
- Selectable PFM or PWM operation
- Over-current and short-circuit protection
- Over-temperature protection
- Over-voltage protection
- Up to 95% peak efficiency