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.

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, P Core and I/O
• Telecom Systems