Intersil has introduced two new PMBus™- compatible, single-phase digital hybrid DC-DC controllers which support Pointof-Load (PoL) power conversion for FPGAs, DSPs, ASICs, processors and general-purpose system rails.
The ISL68200 can drive external MOSFETs directly, while the ISL68201 with PWM output features Intersil’s DrMOS (Integrated Driver and MOSFET) power stage to create a complete voltage-regulator solution.
Both controllers are fully configurable with external pin-strap resistors. This results in a design flow which closely matches that of traditional analogue controllers, while still offering the flexibility and feature set of a digital interface. Designers can use the PMBus interface and Intersil’s PowerNavigator™ GUI software to read back measurements of the input voltage, output voltage, output current and temperature, to monitor fault reporting bits, and to perform on-the-fly changes to the output-voltage set point.
For systems in which PMBus functionality is not required, the interface can be used to debug the power supply during board bring-up, and then left disconnected in final production. This feature speeds development by allowing designers to quickly modify important parameters such as switching frequency, output voltage and loop gain to fine-tune power supply performance without using a soldering iron to
The ISL68200 and ISL68201 benefit from Intersil’s proprietary R4™ modulation technology. This provides a compensation-free control loop which eliminates the need for external compensation resistors and capacitors. The R4 modulator includes energy-saving light load efficiency modes of operation, and has excellent transient performance, adjusting both duty cycle and switching frequency in response to load transients.
- Input-voltage range: 4.5V to 24V
- Output-voltage range: 0.5V to 5.5V
- Eight switching frequency options from
300kHz to 1.5MHz
- Power-good monitor for soft-start and
- Precision Enable input for power
- FPGA, ASIC and memory power supplies
- Point-of-load digital power
- Servers and storage systems
- Telecoms and network equipment
- Wireless basestations
This six-layer board demonstrates a 17mm x 17mm 35A synchronous buck converter, based on the ISL68201 buck controller and the ISL99140 high-performance DrMOS power stage, which integrates a gate driver and MOSFETs.
Orderable Part Number: ISL68201-99140DEMO1Z