The Micrel MIC2164/-2/-3 is a synchronous, digital modified, constant on-time pulse-width modulation (PWM) buck controller family. MIC2164 is the first product in the new Hyper Speed ControlTM family of buck controllers introduced by Micrel. These controllers are targeted for cost sensitive applications requiring high performance such as set-top boxes, gateways, routers, computing peripherals, and telecom/networking equipments.

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

A unique Hyper Speed ControlTM 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 family utilizes an architecture which is constant 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 family is available in a 10-pin MSOP (MAX1954A-compatible) package with a junction operating range from –40?C to +125?C. All support documentation can be found on Micrel’s web site at: www.micrel.com.