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Synchronous Buck Controllers feature adaptive on-time control.

Press Release Summary:

Operating over input supply range of 3-28 V, Hyper Speed Control(TM) MIC2164/-2/-3/C supply 25 A output current and offer switching frequency of 300 kHz, 600 kHz, and 1 MHz, respectively. UVLO feature ensures proper operation under power-sag conditions to prevent external power MOSFET from overheating, while 6 ms internal soft start minimizes inrush current. Housed in 10-pin MSOP, controllers operate from -40 to +125°C with 95% efficiency.

Original Press Release:

MIC2164: 300kHz PWM Buck Controller

General Description

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(TM) 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(TM) architecture allows for ultra-fast transient response while reducing the output capacitance and also makes High V IN/Low V OUT 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.

All support documentation can be found on Micrel's web site at:


o Hyper Speed Control(TM) architecture enables

- High delta V operation (V IN=28V and V OUT=0.8V)

- Smaller output capacitors than competitors

o 3V to 28V input voltage

o Any Capacitor TM stable

- Zero ESR to high ESR

o 25A output current capability

o 300kHz/600kHz/1MHz switching frequency

o Adaptive on-time mode control

o Output down to 0.8V with ± 1% (MIC2164/-2/-3) or ± 3% (MIC2164C) feedback accuracy

o Up to 95% efficiency

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

o 6ms Internal soft start

o Thermal shutdown

o Pre-bias output safe

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

o Available in 10-pin MSOP package

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