The IR3823 SupIRBuck^® is an integrated voltage regulator designed for space-constrained, energy-efficient netcom, server, and storage applications. The IR3823 delivers up to 3 A with superior efficiency in an ultra-compact 3.5 x 3.5 mm package. Efficiencies in excess of 97.5% are obtainable for designs converting power from a 6 V input to a 4.8 V output. The extremely high initial efficiency allows switching at up to 1.5 MHz from a 12 V supply to enable a complete 3 A power supply solution in less than 130 mm². Featuring constant frequency and virtually jitter-free operation with synchronization capability, the new device is well suited to noise-sensitive applications, while the higher bandwidth reduces component count to shrink PCB footprint. A tri-level selectable soft-start feature is also offered for ease of sequencing.

• Single input voltage range from 5 V to 21 V
• Wide input voltage range from 1.0 V to 21 V with external V_cc bias voltage
• Output voltage from 0.6 V to 0.86% of PVin
• Enhanced line/load regulation with feed forward
• Programmable switching frequency up to 1.5 MHz
• Three user selectable soft-start time options
• Thermally compensated current limit with robust hiccup mode over current protection
• Synchronization to an external clock
• Precise reference voltage (0.6 V ± 0.6%)
• Open-drain PGood indication
• Output over voltage protection
• Enable input with under voltage lockout (UVLO)
• V_cc under-voltage lockout (UVLO)
• Enhanced pre-bas start-up
• Integrated MOSFET drivers and bootstrap diode
• Thermal shut down
• -40ºC to 125ºC operating junction temperature
• 3.5 mm x 3.5 mm PQFN package
• Lead-free, Halogen-free, and RoHS6 compliant