The IR3588 CHiL digital control IC along with the optimized single-phase IR3552 and optimized dual-phase IR3548 PowIRstage devices, from International Rectifier, reduce footprint and extend battery life, while offering lower operating current and sleep state power of less than 1 mW. The IR3588 matched with the dual-phase IR3548 is optimized for high performance VR12.6 Ultrabooks up to 25 W while the IR3588 paired with the single-phase IR3552 is designed for standard VR12.6 Ultrabooks up to 15 W. The IR3588 maintains full digital flexibility and offers true-off capability for PS4, ultrafast DVID Up and Down performance and lossless input current telemetry. The PowIRstage devices integrate a low quiescent synchronous buck gate driver, and synchronous MOSFETs and Schottky diode into a compact PQFN package. The IR3548 PowIRstage device supports up to 30 A per phase and delivers up to 95% efficiency at 7.2 to 1.8 Vnom in a 6 x 8 mm PQFN. The IR3552 supports up to 40 A and offers 94% efficiency at 12 to 1.8 Vnom in a 4 x 6 mm PQFN.