ISL6443: 300kHz Dual, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller

The ISL6443 is a high-performance, triple-output controller optimized for converting wall adapter, battery or network intermediate bus DC input supplies into the system supply voltages required for a wide variety of applications. Each output is adjustable down to 0.8V. The two PWMs are synchronized 180° out of phase reducing the RMS input current and ripple voltage.

The ISL6443 incorporates several protection features. An adjustable overcurrent protection circuit monitors the output current by sensing the voltage drop across the lower MOSFET. Hiccup mode overcurrent operation protects the DC/DC components from damage during output overload/short circuit conditions. Each PWM has an independent logic-level shutdown input (SD1 and SD2).

A single PGOOD signal is issued when soft-start is complete on both PWM controllers and their outputs are within 10% of the set point and the linear regulator output is greater than 75% of its setpoint. Thermal shutdown circuitry turns off the device if the junction temperature exceeds +150°C.

Key Features
  • Wide Input Supply Voltage Range
    • Variable 5.6V to 24V
    • Fixed 4.5V to 5.6V
  • Three Independently Programmable Output Voltages
  • Switching Frequency 300kHz
  • Out of Phase PWM Controller Operation
    • Reduces Required Input Capacitance and Power Supply Induced Loads
  • No External Current Sense Resistor
    • Uses Lower MOSFET's rDS(ON)
  • Bidirectional Frequency Synchronization for Synchronizing Multiple ISL6443s
  • Programmable Soft-Start
  • Extensive circuit protection functions
    • PGOOD
    • UVLO
    • Overcurrent
    • Over-temperature
    • Independent Shutdown for Both PWMs
  • Excellent Dynamic Response
    • Voltage Feed-Forward with Current Mode Control
  • QFN Packages:
    • QFN - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline
    • Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
  • Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
  • Power Supplies with Multiple Outputs
  • xDSL Modems/Routers
  • DSP, ASIC, and FPGA Power Supplies
  • Set-Top Boxes
  • Dual Output Supplies for DSP, Memory, Logic, µP Core and I/O
  • Telecom Systems
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN1243: Getting Started with iSim and iSim:PEPDF28 Aug 2015228 KB
AN1652: iSim:PE Users GuidePDF13 Nov 20141.45 MB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL6443 DatasheetPDF17 Nov 2014321 KB
User Guides
TitleTypeUpdatedSizeOther Languages
ISL6443EVAL2Z User GuidePDF13 Nov 2014402 KB
White Papers
TitleTypeUpdatedSizeOther Languages
Five Easy Steps to Create a Multi-Load Power SolutionPDF30 Jan 2017502 KB
How Green is Your Cloud?PDF05 May 2015275 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL6443IR28 Ld QFN0.0728240
ISL6443IR-T28 Ld QFN T+R0.07281240
ISL6443IR-TK28 Ld QFN T+R0.0728240
ISL6443IRZ28 Ld QFN0.07283260RoHS
ISL6443IRZ-T28 Ld QFN T+R0.07283260RoHS
ISL6443IRZ-TK28 Ld QFN T+R0.07283260RoHS
ISL6443EVAL2ZN/ARoHS
ISL6443EVAL2N/A
ISL6443 Datasheet 17 Nov 2014
28 Ld QFN T+R ISL8118
ISL6443
AN1243: Getting Started with iSim and iSim:PE 28 Aug 2015
AN1652: iSim:PE Users Guide 13 Nov 2014
ISL6443EVAL2Z User Guide 13 Nov 2014
Five Easy Steps to Create a Multi-Load Power Solution 30 Jan 2017
How Green is Your Cloud? 05 May 2015