MIC28500
75V/4A Hyper Speed Controlв„ў
Synchronous DC-DC Buck Regulator
SuperSwitcher IIв„ў General Description Features The Micrel MIC28500 is an adjustable frequency,
synchronous buck regulator featuring a unique adaptive ontime control architecture. The MIC28500 operates over an
input supply range of 30V to 75V and provides a regulated
output of up to 4A of output current. The output voltage is
adjustable down to 0.8V with a guaranteed accuracy of ±1%. Micrel’s Hyper Speed Control™ architecture allows for ultrafast 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 MIC28500 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.
All support documentation can be found on Micrel’s web
site at: www.micrel.com. Hyper Speed Controlв„ў architecture enables
-High Delta V operation (VIN = 75V and VOUT = 0.8V)
-Small output capacitance
30V to 75V voltage input
Adjustable output down to 0.8V …
