Micrel, Inc. Supplier Page

MIC23254 Buck Regulator


Micrel buck regulator provides very high efficiency at light loads and ultra-fast transient response


Micrel - MIC23254 Buck RegulatorMicrel, Inc.'s MIC23254 is a low-input voltage, high-efficiency 4MHz dual 400mA synchronous buck regulator with HyperLight Load™ mode. HyperLight Load™ provides very high efficiency at light loads and ultra-fast transient response, which is perfectly suited for supplying processor core voltages. An additional benefit of this proprietary architecture is very low output ripple voltage throughout the entire load range with the use of small output capacitors. MIC23254 operates from an input voltage down to 2.5V for low battery states. The MIC23254 has a tiny 2mm x 2mm Thin MLF® package that saves precious board space by requiring only six additional external components to drive both outputs up to 400mA each.

The device is designed for use with a 1µH inductor and a 4.7µF output capacitor that enables a sub-1mm height. The MIC23254 has a very low quiescent current of 33µA with both outputs enabled and can achieve over 85% efficiency at 1mA. At higher loads the MIC23254 provides a constant switching frequency around 4MHz while providing peak efficiencies over 90%.

The MIC23254 fixed output voltage option is available in a 10-pin 2mm x 2mm Thin MLF®. The MIC23254 is designed to operate over the junction operating range from -40°C to +125°C.


  • Features
  • Applications
  • Diagram
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Features

  • Low input voltage range: 2.5V to 5.5V
  • Dual output current 400mA / 400mA
  • Up to 94% peak efficiency and 85% efficiency at 1mA
  • 33µA dual quiescent current
  • 1µH inductor with a 4.7µF capacitor
  • 4MHz in PWM operation
  • Ultra-fast transient response
  • -40°C to +125°C junction temperature range
  • 3mV output voltage ripple in full PWM mode
  • Fixed output:10-pin 2mm x 2mm Thin MLF®
  • 20mVpp in HyperLight Load™ modeRoHS Compliant
  • 0.01µA shutdown current
  • Low voltage output ripple

Applications

  • Mobile handsets
  • Portable media players
  • Portable navigation devices (GPS)
  • WiFi/WiMax/WiBro modules
  • Digital cameras
  • Wireless LAN cards
  • USB powered devices

Diagram

MIC23254 Diagram

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Digi-Key P/N Micrel P/N Description Voltage - Output Datasheet
576-3714-1-ND MIC23254-GCYMT TR IC REG BUCK 0.4A 1/1.8V 10TMLF 1V, 1.8V Datasheet
 Available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)