Microchip | MIC2285AYMT-TR

The MIC2285AYMT TR is a high efficiency 8 MHz PWM synchronous buck (step-down) regulator that features a LOWQ ® LDO standby mode that draws only 18 µA of quiescent current. The MIC2285A allows an ultra-low noise, small size, and high efficiency solution for portable power applications.

In PWM mode, the MIC2285 A operates with a constant frequency 8 MHz PWM control. Under light load conditions, such as in system sleep or standby modes, the PWM switching operation can be disabled to reduce switching losses. In this light load LOWQ ® 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.

Features:

• 2.7 to 5.5 V supply/input voltage
• Light load LOWQ ® LDO mode
• 20 µA quiescent current
• Low noise, 75 µVrms
• 8 MHz PWM mode
• Output current to 600 mA
• >90% efficiency
• 100% maximum duty cycle
• Adjustable output voltage option down to 1 V
• Fixed output voltage options available
• Ultra-fast transient response
• Requires only a 0.47 µH inductor
• Enables sub 0.55 mm profile solution
• Fully integrated MOSFET switches
• Micropower shutdown
• Thermal shutdown and current limit protection
• 2 mm x 2 mm x 0.55 mm MLF ® package
• –40 ° C to +125 ° C junction temperature range 

Applications:

• Cellular phones
• PDAs
• USB Peripherals