Power Regulation, Conversion and Management – IR3891: Dual Output SupIRBuck® Voltage Regulator


IR3891: Dual Output SupIRBuck® Voltage Regulator
The IR3891 is a dual output SupIRBuck voltage regulator that is optimized for single rail operation from 5V to 12V input or 1V to 21V input with external 5V bias. Available in a compact 5 x 6mm PQFN package, the IR3891 offers an ultra compact solution for applications requiring up to 4A per channel in as little as 165mm2. The IR3891 features a proprietary modulator scheme that enables jitter-free and noise-free operation to allow higher frequency or higher bandwidth operation for better transient response and fewer output capacitors to reduce overall system size.
• 0.5V to 0.86*PVIN output voltage range
• Enhanced line/load regulation with feed-forward
• Internal digital soft start
• Thermally compensated current limit
• External synchronization with smooth clocking
• Sequence pin for sequencing applications
• Dual output, 4A per phase
• Programmable switching frequency up to 1.5MHz
• Enable input with voltage monitoring capability
• Hiccup mode overcurrent protection
• Precision reference voltage (0.5V ±1%)
• 100k MSRP: $3.46 US