Datasheet Microchip MIC26903 — Datenblatt

MIC26903-ZA
28V, 9A Hyper Speed Controlпѓ¤
Synchronous DC-to-DC Buck Regulator
SuperSwitcherв„ў II General Description
The Micrel MIC26903-ZA is a constant-frequency,
synchronous buck regulator featuring a unique adaptive
on-time control architecture. The MIC26903-ZA 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 0.6V 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 MIC26903-ZA offers a full suite of 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” short-circuit …

MIC26903
28V, 9A Hyper Light Loadв„ў
Synchronous DC/DC Buck Regulator
SuperSwitcher IIGв„ў General Description Features The Micrel MIC26903 is a constant-frequency,
synchronous DC/DC buck regulator featuring adaptive ontime control architecture. The MIC26903 operates over a
supply range of 4.5V to 28V. It has an internal linear
regulator which provides a regulated 5V to power the
internal control circuitry. MIC26903 operates at a constant
600kHz switching frequency in continuous conduction
mode and can be used to provide up to 9A of output
current. The output voltage is adjustable down to 0.8V. Micrel’s Hyper Light Load™ architecture provides the same
high-efficiency and ultra-fast transient response as the
Hyper Speed Controlв„ў architecture under medium to heavy
loads, but also maintains high efficiency under light load
conditions by transitioning to variable frequency,
discontinuous mode operation.
The MIC26903 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, thermal shutdown, internal
soft-start to reduce the inrush current, foldback current
limit and “hiccup mode” short-circuit protection. The
MIC26903 includes a Power Good (PG) output to allow …