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, µP Core and I/O

• Telecom Systems