Three-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers
Jump to Page Section:
Overview
Description
The ISL6308 is a three-phase PWM control IC with integrated MOSFET drivers. It provides a precision voltage regulation system for multiple applications including, but not limited to, high current low voltage point-of-load converters, embedded applications and other general purpose low voltage medium to high current applications. The integration of power MOSFET drivers into the controller IC marks a departure from the separate PWM controller and driver configuration of previous multi-phase product families. By reducing the number of external parts, this integration allows for a cost and space saving power management solution. Output voltage can be programmed using the on-chip DAC or an external precision reference. A 2-bit code programs the DAC reference to one of 4 possible values (0. 6V, 0. 9V, 1. 2V and 1. 5V). A unity gain, differential amplifier is provided for remote voltage sensing, compensating for any potential difference between remote and local grounds. The output voltage can also be offset through the use of single external resistor. An optional droop function is also implemented and can be disabled for applications having less stringent output voltage variation requirements or experiencing less severe step loads. A unique feature of the ISL6308 is the combined use of both DCR and rDS(ON) current sensing. Load line voltage positioning and overcurrent protection are accomplished through continuous inductor DCR current sensing, while rDS(ON) current sensing is used for accurate channel-current balance. Using both methods of current sampling utilizes the best advantages of each technique. Protection features of this controller IC include a set of sophisticated overvoltage and overcurrent protection. Overvoltage results in the converter turning the lower MOSFETs ON to clamp the rising output voltage and protect the load. An OVP output is also provided to drive an optional crowbar device. The overcurrent protection level is set through a single external resistor. Other protection features include protection against an open circuit on the remote sensing inputs. Combined, these features provide advanced protection for the output load.
Features
- Integrated Multi-Phase Power Conversion
- 1, 2, or 3-Phase Operation
- Precision Output Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.8% System Accuracy Over-Temperature (for REF = 0.6V and 0.9V)
- ±0.5% System Accuracy Over-Temperature (for REF = 1.2V and 1.5V)
- Usable for Output Voltages not Exceeding 2.3V
- Adjustable Reference-Voltage Offset
- Precision Channel Current Sharing
- Uses Loss-Less rDS(ON) Current Sampling
- Optional Load Line (Droop) Programming
- Uses Loss-Less Inductor DCR Current Sampling
- Variable Gate-Drive Bias - 5V to 12V
- Internal or External Reference Voltage Setting
- On-Chip Adjustable Fixed DAC Reference Voltage with 2-bit Logic Input Selects from Four Fixed Reference Voltages (0.6V, 0.9V, 1.2V, 1.5V)
- Reference can be Changed Dynamically
- Can use an External Voltage Reference
- Overcurrent Protection
- Multi-tiered Overvoltage Protection
- OVP Pin to Drive Optional Crowbar Device
- Selectable Operation Frequency up to 1.5MHz Per Phase
- Digital Soft-Start
- Capable of Start-Up in a Pre-Biased Load
- Pb-Free (RoHS Compliant)
Applications
Applications
- High Current DDR/Chipset core voltage regulators
- High Current, Low voltage DC/DC converters
- High Current, Low voltage FPGA/ASIC DC/DC converters
Documentation
| Document title | Document type
|
Date Date | |
|---|---|---|---|
| PDF 1.26 MB | Datasheet | ||
| PDF 509 KB | Application Note | ||
| PDF 397 KB | Application Note | ||
| PDF 1.17 MB | End Of Life Notice | ||
| PDF 683 KB | Manual - Development Tools | ||
| PDF 202 KB | Product Change Notice | ||
| PDF 326 KB | Product Change Notice | ||
| PDF 398 KB | Product Change Notice | ||
| PDF 145 KB | Product Change Notice | ||
| PDF 223 KB | Product Change Notice | ||
| PDF 243 KB | Product Change Notice | ||
| PDF 183 KB | Product Change Notice | ||
| PDF 173 KB | Product Change Notice | ||
| PDF 79 KB | Product Change Notice | ||
| PDF 248 KB | Product Change Notice | ||
15 items
|
|||
Design & Development
Software & Tools
Software & Tools
| Software title
|
Software type
|
Company
|
|---|---|---|
| iSim:PE Offline Simulation Tool iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs.
|
Simulator | Renesas |
1 item
|
||
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Product Options
Processing table
| QFN | Tube | 500 | ||
| QFN | Reel | 4000 |
Tips for Using This Parametric Table:
- Hide Filters button in header: Collapse or expands filters
- Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
- Reset button in header: Reset all filters to the page default
- Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
- Export button in header: Export the filtered results of the table to an Excel document
- Filter parts search bar in header: Type to filter table results by part number
- Hide column button in column headers: Select to hide columns in table
- AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
- Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
- Document icon next to product name in row: View the featured document for this product
- Chip icon next to the right of the document icon in row: View the block diagram for this product
- Cart icon to the right of the chip icon: Indicates that samples are available for this product