MIC23050-SYML-TR

The Micrel MIC23050 is a high-efficiency, 600mA, PWM, synchronous buck (step-down) regulator featuring the HyperLight Load™ patented switching scheme that offers best-in-class light load efficiency and transient performance while providing very-small external components and low output ripple at all loads. The MIC23050 also has a very-low typical quiescent current draw of 20μA and can achieve over 89% efficiency even at 1mA. The device allows operation with a tiny inductor ranging from 0.47μH to 2.2μH and uses a small output capacitor that enables a sub-1mm height. In contrast to traditional light load schemes, the HyperLight Load™ architecture does not need to trade off control speed to obtain low standby currents and in doing so the device only needs a small output capacitor to absorb the load transient as the powered device goes from light load to full load. At higher loads the MIC23050 provides a constant switching frequency of greater than 4MHz while providing peak efficiencies greater than 93%. The MIC23050 comes in fixed output voltage options from 0.72V to 3.3V eliminating external feedback components. The MIC23050 is available in an 8-pin 2mm×2mm MLF with a junction operating range from -40°C to +125°C.

Applications

• Cellular phones
• Digital cameras
• Portable media players
• Wireless LAN cards
• WiFi/WiMax/WiBro modules
• USB-powered devices

Key features

• Input voltage: 2.7V to 5.5V HyperLight Load™
• 600mA output current
• Fixed output voltage from 0.72V to 3.3V
• Ultra-fast transient response
• 20μA typical quiescent current
• 4MHz in PWM in constant-current mode
• 0.47μH to 2.2μH inductor
• Low voltage output ripple − 25mVPP in HyperLight Load™ mode
• 3mV output voltage ripple in full PWM mode
• >93% efficiency
• ~89% at 1mA
• Micropower shutdown
• Available in 8-pin 2mm×2mm MLF
• -40°C to +125°C junction temperature range