• Input voltage: 2.7V to 5.5V
• Output voltage: fixed or adjustable (down to 0.7V)
• Up to 2A output current
• Up to 94% peak efficiency
• 85% typical efficiency at 1mA
• Power Good output
• Programmable soft-start
• 22µA typical quiescent current
• 3MHz PWM operation in continuous conduction mode
• Ultra fast transient response
• Active output discharge when disabled
• Low output voltage ripple
• Fully integrated MOSFET switches
• 0.01µA shutdown current
• Thermal shutdown and current limit protection
• -40°C to +125°C junction temperature range

The MIC23155 is a high efficiency 3MHz 2A synchronous buck regulator with HyperLight Load^® mode, Power Good output indicator, and programmable soft start. HyperLight Load^® provides very high efficiency at light loads and ultra fast transient response which makes the MIC23155 perfectly suited for supplying processor core voltages. 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 MIC23155 is designed for use with a very small inductor, down to 0.47µH, and an output capacitor as small as 2.2µF that enables a total solution size, less than 1mm in height.

The MIC23155 has a very low quiescent current of 22µA and achieves a peak efficiency of 94% in continuous conduction mode. In discontinuous conduction mode, the MIC23155 can achieve 85% efficiency at 1mA.