Dual PWM and Linear Controller 24-Pin QSOP

The ISL6446A is a high-performance, triple output controllerthat provides a single high-frequency power solution primarilyfor Broadband, DSL and Networking applications. This deviceintegrates complete control, monitoring and protectionfunctions for two synchronous buck PWM controllers and onelinear controller. Input voltage ripple and total RMS inputcurrent is substantially reduced by synchronized 180°out-of-phase operation of the two PWMs. The two PWM buck converters provide simple voltage modecontrol. The output voltage of the converters can be preciselyregulated to as low as 0.6V, with a maximum tolerance of±1.5% over-temperature and line variations. Programmableswitching frequency down to 100kHz provides optimized lowcost solution for ATX power supplies. It is also able to operateup to 2.5MHz to deliver compact solutions. The linearcontroller provides a low-current output.

• 4.5V to 5.5V or 5.5V to 24V input voltage range
• Three programmable power output voltages
  • Two PWM controllers with out-of-phase operation
  • Voltage-mode PWM control
  • One linear controller
• Programmable switching frequency from 100kHz to 2.5MHz
• Fast transient response
  • High-bandwidth error amplifier
• Extensive circuit protection functions
  • Undervoltage, and over-temperature
  • Overvoltage with latch-off mode
  • Programmable overcurrent limit with latch-off mode
  • Lossless current sensing (no sense resistor needed)
• Externally adjustable soft-start time
  • Independent enable control
  • Voltage tracking capability
  • Able to soft-start into a prebiased load
• PGOOD output with delay