MIC28304 Datasheet, PDF (1/39 Pages) Micrel Semiconductor – 70V 3A Power Module

MIC28304
70V 3A Power Module
Hyper Speed Control™ Family
General Description
Micrel’s MIC28304 is synchronous step-down regulator
module, featuring a unique adaptive ON-time control
architecture. The module incorporates a DC-to-DC
controller, power MOSFETs, bootstrap diode, bootstrap
capacitor and an inductor in a single package. The
MIC28304 operates over an input supply range from 4.5V
to 70V and can be used to supply up to 3A of output
current. The output voltage is adjustable down to 0.8V with
a guaranteed accuracy of ±1%. The device operates with
programmable switching frequency from 200kHz to
600kHz.
Micrel’s HyperLight Load™ architecture provides the same
high-efficiency and ultra-fast transient response as the
Hyper Speed Control™ architecture under the medium to
heavy loads, but also maintains high efficiency under light
load conditions by transitioning to variable frequency,
discontinuous-mode operation.
The MIC28304 offers a full suite of protection features.
These include undervoltage lockout, internal soft-start,
foldback current limit, “hiccup” mode short-circuit
protection, and thermal shutdown.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• Easy to use
− Stable with low-ESR ceramic output capacitor
− No compensation and no inductor to choose
• 4.5V to 70V input voltage
• Single-supply operation
• Power Good (PG) output
• Low radiated emission (EMI) per EN55022, Class B
• Adjustable current limit
• Adjustable output voltage from 0.9V to 24V
(also limited by duty cycle)
• 200kHz to 600kHz, programmable switching frequency
• Supports safe start-up into a pre-biased output
• –40°C to +125°C junction temperature range
• Available in 64-pin, 12mm × 12mm × 3mm QFN
package
Applications
• Distributed power systems
• Industrial, medical, telecom, and automotive
Typical Application
Hyper Speed Control, HyperLight Load, and Any Capacitor are trademarks of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 25, 2014
Revision 1.1