MIC2177

The Micrel MIC2177 is a 200kHz synchronous buck (step-down) switching regulator designed for high-efficiency, battery-powered applications.

The MIC2177 operates from a 4.5V to 16.5V input and features internal power MOSFETs that can supply up to 2.5A output current. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions. It also features a shut down mode that reduces quiescent current to less than 5µA.

The MIC2177 achieves high efficiency over a wide output current range by switching between PWM and skip mode. Operating mode is automatically selected according to output conditions. Switching frequency is preset to 200kHz and can be synchronized to an external clock signal of up to 300kHz.

The MIC2177 uses current-mode control with internal current sensing. Current-mode control provides superior line regulation and makes the regulator control loop easy to compensate. The output is protected with pulse-by-pulse current limiting and thermal shutdown. Undervoltage lockout turns the output off when the input voltage is less than 4.5V.

The MIC2177 is packaged in a 20-pin wide power SO package with an operating temperature range of -40°C to +85°C.

See the MIC2178 for externally selected PWM or skip-mode operation.

Features
  • 4.5V to 16.5V input voltage range
  • Dual-mode operation for high efficiency (up to 96%)
  • PWM mode for > 200mA load current
  • Skip mode for < 200mA load current
  • 100 mΩ internal power MOSFETs at 12V input
  • 200kHz preset switching frequency
  • Low quiescent current
  • 1.0mA in PWM mode
  • 500µA in skip mode
  • < 5µA in shutdown mode
  • 100% duty cycle for low dropout operation
  • Current-mode control
  • Simplified loop compensation
  • Superior line regulation
  • Current limit
  • Thermal shutdown
  • Undervoltage lockout
Parameter
Parameter Name Value Value
Regulator Type Step Down (Buck) Step Down (Buck)
# of Outputs 1 1
Input Voltage Range Min (V) 4.5 4.5
Input Voltage Range Max (V) 16.5 16.5
Output Voltage Range Min (V) 1.245 1.245
Output Voltage Range Max (V) 16.5 16.5
Output Current (A) max 2 2
Quiescent Current (mA) typ 0.5 0.5
Switching Frequency (kHz) 200 200
Synchronous Rectifier Yes Yes
Operating Temp Range -40 to 85 -40 to 85
Vfb (V) 1.245 1.245
Duty Cycle Max (%) 1 1
SHUTDOWN Current (µA) (Typ) 1 1
Light Load Efficiency Mode Yes Yes
Documents
MIC2177 - 2.5A Synchronous Buck RegulatorData Sheets11/05/2015219KB
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC2177-3.3YWM0.5420000.97368420SOIC.300inMatte Tine3
MIC2177-3.3YWM-TR0.5420000.31187520SOIC.300inMatte Tine3
MIC2177-5.0YWM0.5420000.97368420SOIC.300inMatte Tine3
MIC2177-5.0YWM-TR0.5420000.31187520SOIC.300inMatte Tine3
MIC2177YWM0.5420000.97368420SOIC.300inMatte Tine3
MIC2177YWM-TR0.5420000.31187520SOIC.300inMatte Tine3
MIC2177 - 2.5A Synchronous Buck Regulator MIC2177
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