The MIC33163 is a highly-efficient synchronous buck regulator with integrated inductor which provides the optimal trade-off between footprint and efficiency. The MIC33163 operates at 4MHz switching frequency and provides up to 1A output current. In addition, the 100% duty cycle and HyperLight Load® (HLL) mode-of-operation delivers very-high efficiency at light loads and ultra-fast transient response which makes the MIC33163 perfectly suited for any space constrained application and great alternative for low dropout regulators. An additional benefit of this proprietary architecture is very low output ripple voltage throughout the entire load range with the use of small output capacitors. The MIC33163 provides a small compact total solution size of 4.6mm × 7mm with very few tiny external components. At higher loads, the MIC33163 provides a constant switching frequency around 4MHz while achieving peak efficiencies up to 93%. It also includes under-voltage lockout to ensure proper operation under power-sag conditions, internal soft-start to reduce inrush current, foldback current limit, power good (PG) indicator and thermal shutdown. The MIC33163 is available in 20-pin 2.5mm × 3.0mm × 1.1mm QFN package with an operating junction temperature range from -40°C to +125°C.Integrated MOSFETs and inductor 100% duty cycle 4MHz PWM operation in continuous mode 1A output current Low output voltage ripple 85% typical efficiency at 1mA, up to 93% peak efficiency Ultra-fast transient response Advanced copper lead frame design provides superior thermal performance Low-radiated emission (EMI) per EN55022, class B Adjustable output voltage 0.7V to 5V Thermal-shutdown and current-limit protection Configurable soft-start with pre-bias start-up capability Low profile 2.5mm × 3.0mm × 1.1mm QFN packages 0.1µA shutdown current 33µA quiescent current