MIC2285A

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

In PWM mode, the MIC2285A 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 MIC2285A operates from 2.7V to 5.5V input and features internal power MOSFETs that can supply up to 600mA output current in PWM mode. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions.

The MIC2285A is available in the 10-pin 2mm x 2mm Thin MLF® package with a junction operating range from -40°C to +125°C.

Features
  • Light load LowQ® LDO mode
  • 20 µA quiescent current
  • Low noise, 75 µVrms
  • 8MHz PWM mode
  • Output current to 600mA
  • >90% efficiency
  • 100% maximum duty cycle
  • Adjustable output voltage option down to 1V
  • Fixed output voltage options available
  • Ultra-fast transient response
  • Requires only a 0.47µH inductor
  • Enables sub 0.55mm profile solution
  • Fully integrated MOSFET switches
  • Micropower shutdown
  • Thermal shutdown and current limit protection
  • 10-pin 2mm x 2mm x 0.55mm 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
MIC2285A - 8MHz PWM Synchronous Buck Regulator with LDO Standby ModeData Sheets11/05/2015546KB
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC2285AYMT-TR0.07300010UDFN2x2x0.6mmNiPdAue4
MIC2285A - 8MHz PWM Synchronous Buck Regulator with LDO Standby Mode MIC2285A