MIC2285

The Micrel MIC2285 is a high efficiency 8MHz pulse width modulated (PWM) synchronous buck (stepdown) regulator that features a LowQ® LDO standby mode that draws only 18µA of quiescent current. The MIC2285 allows an ultra-low noise, small size, and high efficiency solution for portable power applications.

In PWM mode, the MIC2285 operates with a constant frequency 8MHz 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 18µA 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.

The MIC2285 operates from a 2.7V to 5.5V input voltage and features internal power MOSFETs that can supply up to 500mA output current in PWM mode. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions.

The MIC2285 is available in the 10-pin 3mm x 3mm MLF® package with a junction operating range from -40°C to +125°C.

Features
  • 2.7 to 5.5V supply/input voltage
  • Light load LowQ® LDO mode
  • 20µA quiescent current
  • Low noise, 75µVrms
  • 8MHz PWM mode
  • Output current to 500mA
  • >90% efficiency
  • 100% maximum duty cycle
  • Adjustable output voltage option down to 1V
  • Fixed output voltage options available
  • Ultra-fast transient response
  • Uses a tiny 0.47µH inductor
  • Enables sub 1mm profile solution
  • Fully integrated MOSFET switches
  • Micropower shutdown
  • Thermal shutdown and current limit protection
  • Pb-free 10-pin 3mm x 3mm MLF® package
  • -40°C to +125°C junction temperature range
Parameter
Parameter Name Value Value
Regulator Type Step Down (Buck) Step Down (Buck)
# of Outputs 1 1
Input Voltage Range Min (V) 2.7 2.7
Input Voltage Range Max (V) 5.5 5.5
Output Voltage Range Min (V) 1 1
Output Voltage Range Max (V) 5.5 5.5
Quiescent Current (mA) typ 0.79 0.79
Switching Frequency (kHz) 8000 8000
Synchronous Rectifier Yes Yes
Operating Temp Range -40 to 125 -40 to 125
Vfb (V) 1 1
Duty Cycle Max (%) 1 1
SHUTDOWN Current (µA) (Typ) 0.01 0.01
Documents
MIC2285 - 8MHz PWM Synchronous Buck Regulator with LDO Standby ModeData Sheets11/05/2015559KB
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC2285AYMT-TR0.07300010UDFN2x2x0.6mmNiPdAue4
MIC2285YML-TR0.64370210VDFN3x3x0.9mmNiPdAue4
MIC2285 - 8MHz PWM Synchronous Buck Regulator with LDO Standby Mode MIC2285