MIC4950 Datasheet, PDF (1/18 Pages) Micrel Semiconductor – Hyper Speed Control 5A Buck Regulator

MIC4950
Hyper Speed Control™ 5A Buck Regulator
General Description
The MIC4950 is a high-efficiency, 5A synchronous buck
regulator with ultra-fast transient response. It is perfectly
suited for supplying processor core and I/O voltages from
a 5V or 3.3V bus. The MIC4950 provides a switching
frequency up to 3.3MHz while achieving peak efficiencies
up to 95%. An additional benefit of high-frequency
operation is very low output ripple voltage throughout the
entire load range with the use of a small output capacitor.
The MIC4950 is designed for use with a very small
inductor, down to 1µH, and an output ceramic capacitor as
small as 10µF, without the need for external ripple
injection. A wide range of output capacitor types and
values can also be accommodated.
The MIC4950 supports safe start-up into a pre-biased
output, and offers short-circuit and thermal shutdown
protections.
The MIC4950 is available in 8-Pin SOIC and 10-Pin 3mm
× 4mm DFN packages with an operating junction
temperature range from –40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
 Input voltage: 2.7V to 5.5V
 5A output current
 Up to 95% efficiency
 Up to 3.3MHz operation
 Safe start-up into a pre-biased output
 Power Good output
 Ultra-fast transient response
 Low output voltage ripple
 Low R_DSON integrated MOSFET switches
 0.01µA shutdown current
 Thermal shutdown and current limit protection
 Output voltage as low as 0.7V
 8-Pin SOIC and 3mm × 4mm DFN-10L
 –40°C to +125°C junction temperature range
Applications
 DTVs
 Set-top boxes
 Printers
 DVD players
 Distributed power supplies
Typical Application
Hyper Speed Control is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 20, 2014
Revision 1.1