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2022-09-24 23:33:15
ISL6439 - Single Synchronous Buck PWM Controller for Broadband Gateway Applications
The ISL6439 easily enables the implementation of a DC-DC buck converter with complete control and protection schemes. Designed to drive N-channel MOSFETs in a synchronous buck topology, the ISL6439 integrates control, output regulation, monitoring and protection functions into a single package. The ISL6439 provides simple single feedback loop, voltagemode control with fast transient response. The output voltage can be precisely regulated down to 0.8V, with a maximum tolerance over temperature and line voltage of ±1.5% voltage variation. Fixed frequency oscillators reduce design complexity while balancing cost and efficiency for typical applications. The error amplifier features a 15MHz gain bandwidth product and 6V/µs slew rate, enabling high switching bandwidth for fast transient performance. The resulting PWM duty cycle ranges from 0% to 100%. Provides protection under overcurrent conditions by monitoring the RDS(ON) of the upper MOSFET to suppress PWM operation properly. This method simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor.