The Micrel MIC2164/-2/-3/C are constant frequency, synchronous buck controllers featuring adaptive on-time control. The MIC2164/-2/-3/C are the first products in the new Hyper Speed Control? family of buck controllers introduced by Micrel.

The MIC2164/-2/-3/C controllers operate over an input supply range of 3V to 28V, and are independent of the IC supply voltage. The devices are capable of supplying 25A output current. While the MIC2164 operates at 300kHz, the MIC2164-2 operates at 600kHz, and the MIC2164-3 operates at 1MHz.

A unique Hyper Speed Control? architecture allows for ultra-fast transient response while reducing the output capacitance and also makes High VIN/Low VOUT operation possible. The MIC2164/-2/-3/C controllers utilizes an architecture which is adaptive tON ripple controlled. A UVLO feature is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFET from overheating. A soft start feature is provided to reduce the inrush current. Foldback current limit and "hiccup" mode short-circuit protection ensure FET and load protection.

The MIC2164/-2/-3/C controllers are available in a 10-pin MSOP (MAX1954A-compatible) package with a junction operating range from -40°C to +125°C.

  Hyper Speed Control? architecture enables

  High delta V operation (V HSD=28V and V OUT=0.8V)

  Smaller output capacitors than competitors

  3V to 28V input voltage

  Any Capacitor? stable

  Zero ESR to high ESR

  25A output current capability

  300kHz/600kHz/1MHz switching frequency

  Adaptive on-time mode control

  Adjustable outputfrom 0.8V to 5.5Vwith ±1% (MIC2164/-2/-3) or ±3% (MIC2164C) feedback accuracy

  Up to 95% efficiency

  Foldback current limit and "hiccup" mode short-circuit protection

  6ms Internal soft start

  Thermal shutdown

  Safe start-up into pre-biased loads

  -40°C to +125°C junction temperature range

  Available in 10-pin MSOP package