MICROCHIP MIC23051-C4YML-TR

A high efficiency 600 mA PWM synchronous buck (step-down) regulator featuring HyperLight Load®, a 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. It has an output voltage scaling feature that toggles between two different voltage levels. It also has a very low typical quiescent current draw of 20 μA and can achieve over 85% efficiency even at 1 mA. The device allows operation with a tiny inductor ranging from 0.47 μH to 2.2 μH and uses a small output capacitor that enables a sub 1 mm height solution. In contrast to traditional light load schemes, 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 it provides a constant switching frequency of greater than 4 MHz while providing peak efficiencies greater than 93%. It is available in fixed output voltage options eliminating external feedback components. It is available in an 8-pin 2 mm×2 mm DFN with a junction operating range from -40°C to +125°C.

• Input Voltage: 2.7V to 5.5V
• 600 mA Output Current
• Fixed Output Voltage 1.25V, 1.2V, 1.4V and 1.8V with Voltage Scaling Down Using VSC pin to: 0.95V, 1.0V, 1.15V and 1.0V
• Ultra-Fast Transient Response
• 20 μA Typical Quiescent Current
• 4 MHz CCM PWM Operation in Normal Mode
• 0.47 μH to 2.2 μH Inductor
• Low Voltage Output Ripple - 25 mVPP Ripple in HyperLight Load® Mode - 3 mV Output Voltage Ripple in Full PWM Mode

• 93% Efficiency

• ~85% at 1 mA
• Micropower shutdown
• Available in 8-pin 2 mm x 2 mm DFN Package
• -40°C to +125°C Junction Temperature Range

• Cellular Phones
• Digital Cameras
• Portable Media Players
• Wireless LAN Cards
• WiFi/WiMax/WiBro Modules
• USB Powered Devices