Dual (180°Out-of-Phase) PWM and Linear Controller

The ISL6446 is a high-performance, triple output controller that provides a single high-frequency power solution primarily for broadband, DSL and networking applications. This device integrates complete control, monitoring and protection functions for two synchronous buck PWM controllers and one linear controller. Input voltage ripple and total RMS input current is substantially reduced by synchronized 180° out-of-phase operation of the two PWMs.

Features

• 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

Applications

• ATX power supplies

• DSP, ASIC and FPGA point of load regulation

• Industrial and security networking applications