MIC26901
28V, 9A Hyper Speed Controlв„ў
Synchronous DC/DC Buck Regulator
SuperSwitcher IIв„ў General Description Features The Micrel MIC26901 is a constant-frequency, synchronous
buck regulator featuring a unique adaptive on-time control
architecture. The MIC26901 operates over an input supply
range of 4.5V to 28V and provides a regulated output of up to
9A 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 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 MIC26901 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.
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 = 28V and VOUT = 0.8V) …