Synchronous Step Down Controller 32-Pin MLPQ T/R

The IR3622A IC integrates a dual synchronous Buck controller, providing a high performance and flexible solution. The IR3622A can be configured as 2-independent outputs or as current shared single output. The current share configuration is ideal for high current applications. The IR3622A enables output tracking and sequencing of multiple rails in either ratiometric or simultaneous fashion. The IR3622A features 180° out of phase operation which reduces the required input/output capacitance and results in lower number of capacitors. The switching frequency is programmable from 200kHz to 600kHz per phase using one external resistor. In addition, IR3622A also allows the switching frequency to be synchronized to an external clock signal. Other key features offered by this device include two independent programmable soft starts, two independent power good outputs, precision enable input, and under voltage lockout function. The current limit is provided by sensing the lower MOSFET"s on-resistance for optimum cost and performance. The output voltages are monitored through dedicated pins to protect against open circuit, and enhance faster response to an overvoltage event.

• Dual Synchronous Controller with 180° Out of Phase Operation
• Configurable to 2-Independent Outputs or Current Shared Single Output
• Output Voltage Tracking
• Power up / down Sequencing
• Current Sharing Using Inductor’s DCR
• +/-1% Accurate Reference Voltage
• Programmable Switching Frequency up 600kHz
• Programmable Over Current Protection
• Hiccup Current Limit Using MOSFET Rds(on) sensing
• Latched Overvoltage Protection
• Dual Programmable Soft-Starts
• Programmable Enable Input
• Pre-Bias Start-up
• Dual Power Good Outputs
• On Board Regulator
• External Frequency Synchronization
• Thermal Protection
• 32-Lead MLPQ Package