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MIC26400 Buck Regulator

Micrel’s Hyper Speed Control™ architecture allows for ultra-fast transient response

Micrel - MC26400 Buck Regulator Micrel, Inc.'s MIC26400 is a constant-frequency synchronous buck regulator featuring a unique digitally modified adaptive ON-time control architecture. The MIC26400 operates over an input supply range of 4.5V to 26V and provides a regulated output at up to 5A of output current. The output voltage is adjustable down to 0.8V with a typical accuracy of ±1%, and the device operates at a switching frequency of 300kHz.

Micrel’s Hyper Speed Control TM architecture allows for ultra-fast transient response while reducing the output capacitance and also makes (High VIN)/(Low VOUT) operation possible. This digitally modified adaptive tON ripple control architecture combines the advantages of fixed frequency operation and fast transient response in a single device.

The MIC26400 offers a full suite of protection features to ensure protection of the IC during fault conditions. These include undervoltage lockout to ensure proper operation under power-sag conditions, internal soft-start to reduce inrush current, foldback current limit, “hiccup” mode short-circuit protection, and thermal shutdown.

  • Features
  • Applications
  • Diagram
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  • Foldback current limit and "hiccup" mode short-circuit protection
  • -40°C to +125°C junction temperature range
  • Hyper Speed Control™ architecture enables
    • High delta V operation (VIN = 26V and VOUT = 0.8V)
    • Small output capacitance
  • Supports safe start-up into a pre-biased load
  • Any Capacitor™ Stable
    • Zero ESR to high-ESR output capacitance
  • 300kHz switching frequency
  • Output down to 0.8V with ±1% accuracy
  • 28-pin 5mm x 6mm MLF® package
  • Internal compensation
  • Up to 95% efficiencyRoHS Compliant
  • 6ms internal soft-start
  • 5A output current capability
  • Thermal shutdown
  • 4.5V to 26V input voltage


  • Printers, scanners, graphic cards, and video cards
  • Distributed power systems
  • Communications/networking infrastructure
  • Set-top boxes, gateways, and routers


MIC26400 Diagram

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Digi-Key P/N Micrel P/N Description Current - Output Datasheet
576-3715-1-ND MIC26400YJL TR REG DC-DC BUCK ADJ 5A 28-MLF 5A Datasheet
 Available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)