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Numéro de sérieISL6308A
CategoriePower Management => PWM Controllers
DescriptionThree-Phase Buck PWM Controller With High Current Integrated MOSFET Drivers
The ISL6308A 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.
SociétéIntersil Corporation
DatasheetTélécharger ISL6308A datasheet
 
 
  • Description courte

  • Three-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers

    The 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 two 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 ISL6308A 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 or 3-Phase Operation· Precision Output Voltage Regulation - Differential Remote Voltage Sensing - ±0.8% System Accuracy Over-Temperature (for REF=0.6V and - ±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 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 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 to 1.5MHz per Phase· Digital Soft-Start· Capable of Start-up in a Pre-Biased Load· Pb-Free (RoHS Compliant)

    Applications

    · High Current DDR/Chipset Core Voltage Regulators· High Current, Low Voltage DC/DC Converters· High Current, Low Voltage FPGA/ASIC DC/DC Converters

    PART NUMBER ISL6308ACRZ* (Note) ISL6308AIRZ* (Note) ISL6308AEVAL1Z PART MARKING 6308A CRZ 6308A IRZ Evaluation Platform TEMP. RANGE (°C) to +85 PACKAGE Ld 6x6 QFN (Pb-free) Ld 6x6 QFN (Pb-free) PKG. DWG. # L40.6x6

    *Add "-T" suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

    CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2008. All Rights Reserved All other trademarks mentioned are the property of their respective owners.

    UGATE1 GND VSEN 12 OCSET 13 ICOMP 14 DROOP 15 ISUM 16 IREF BOOT3 LGATE1 PGOOD ISEN1 32
    UGATE1 SOFT-START x1 AND FAULT LOGIC GATE CONTROL LOGIC SHOOTTHROUGH PROTECTION PHASE1

    REF1 DAC REF0 DAC PVCC3 BOOT3 REF E/A FB CHANNEL CURRENT BALANCE 1 N GATE CONTROL LOGIC SHOOTTHROUGH PROTECTION