MIC26400 Buck Regulator

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

Image of Micrel's MIC26400 Buck RegulatorMicrel, 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 4.5 V to 26 V and provides a regulated output at up to 5 A of output current. The output voltage is adjustable down to 0.8 V with a typical accuracy of ±1%, and the device operates at a switching frequency of 300 kHz.

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.

  • 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 = 26 V and VOUT = 0.8 V)
    • Small output capacitance
  • Supports safe start-up into a pre-biased load
  • Any Capacitor™ Stable
    • Zero ESR to high-ESR output capacitance
  • 300 kHz switching frequency
  • Output down to 0.8 V with ±1% accuracy
  • Output down to 0.8 V with ±1% accuracy
  • 28-pin 5 mm x 6 mm MLF® package
  • Internal compensation
  • Up to 95% efficiency
  • 6 ms internal soft-start
  • 5 A output current capability
  • Thermal shutdown
  • 4.5 V to 26 V input voltage
  • RoHS Compliant


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

MIC26400 Buck Regulator

ImageManufacturer Part NumberDescriptionAvailable Quantity
MIC26400YJL-TR datasheet linkIC REG BUCK ADJ 5A SYNC 28-MLFMIC26400YJL-TRIC REG BUCK ADJ 5A SYNC 28-MLF1859 - Immediate
MIC26400YJL-TR product page link
Published: 2011-02-18