MIC24055
12V, 12A High-Efficiency Buck Regulator
SuperSwitcher IIпЈЄ General Description Features The Micrel MIC24055 is a constant-frequency,
synchronous buck regulator featuring a unique adaptive
on-time control architecture. The MIC24055 operates over
an input supply range of 4.5V to 19V and provides a
regulated output of up to 12A of output current. The output
voltage is adjustable down to 0.8V with a guaranteed
accuracy of В±1%, and the device operates at a switching
frequency of 600kHz. Micrel’s Hyper Speed Control architecture allows for
ultra-fast transient response while reducing the output
capacitance and also makes (High VIN)/(Low VOUT)
operation possible. This adaptive tON ripple control
architecture combines the advantages of fixed-frequency
operation and fast transient response in a single device.
The MIC24055 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” shortcircuit protection and thermal shutdown. An open-drain
power good (PG) pin is provided.
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The 12A HyperLight Load part, MIC24056, is also …
