MICROCHIP MIC2206-1.2YML-TR

The 2 MHz PWM synchronous buck (step-down) regulator features an LDO standby mode that draws only 18 μA of quiescent current. It allows an ultra-low noise, small size, and high efficiency solution for portable power applications. In PWM mode, it operates with a constant frequency 2 MHz PWM control. Under light load conditions, the PWM switching operation can be disabled to reduce switching losses. In this light load mode, the LDO maintains the output voltage and draws only 18 μA of quiescent current. The LDO mode of operation saves battery life while not introducing spurious noise and high ripple as experienced with pulse skipping or bursting mode regulators. It operates from 2.7V to 5.5V input and features internal power MOSFETs that can supply up to 600 mA output current in PWM mode. It can operate with a maximum duty cycle of 100% for use in low dropout conditions. It is available in a 3 mm×3 mm VDFN-10L package with an operating junction temperature range from -40°C to +125°C.

• 2.7 to 5.5V Supply Voltage
• Light Load LDO mode - 18 μA quiescent current - Low Noise, 75 µVRMS
• 2 MHz PWM Mode - Output Current to 600 mA - >95% Efficiency - 100% Maximum Duty Cycle
• Output Voltage Scaling (1V Output in LOWQ Mode)
• Ultra-Fast Transient Response
• Stable with 1 μF Ceramic Output Capacitor
• Fully Integrated MOSFET Switches
• Micropower Shutdown
• Thermal Shutdown and Current Limit Protection
• Pb-Free 3 mm x 3 mm x 0.9 mm VDFN Package
• -40°C to +125°C Junction Temperature Range

• Cellular Phones
• PDAs
• USB Peripherals