Overview

Support is limited to customers who have already adopted these products.

The ISL6443A 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 at 180° out of phase, thus reducing the RMS input current and ripple voltage. The ISL6443A 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 (SD1SD1 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.

ISL6443A Functional Diagram
ISL6443A Functional Diagram
  • 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 ISL6443As
  • 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 (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

Design & Development

Boards & Kits

ISL6443AEVAL2Z Step-Down PWM & Linear Controller Eval Board

ISL6443AEVAL2Z

Evaluation
Learn More

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

The ISL6443AEVAL2Z evaluation board highlights the operation of the ISL6443A 300kHz, dual, 180° out-of-phase, step-down pulse width modulating (PWM) and single linear...

Featured Documents:
ISL6443AEVAL2Z User Guide

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.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    MOQ
    Buy / Sample
    Part Number
    ISL6443AIRZ
    circleObsolete
    memory
    view_in_ar
    		QFN Tube 1200
    ISL6443AIRZ-TK
    circleObsolete
    memory
    view_in_ar
    		QFN Reel 1000
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