MIC23303 Datasheet, PDF (1/21 Pages) Micrel Semiconductor – 4MHz PWM 3A Buck Regulator with HyperLight Load™ and Power Good

MIC23303
4MHz PWM 3A Buck Regulator with
HyperLight Load™ and Power Good
General Description
The MIC23303 is a high-efficiency 4MHz 3A synchronous
buck regulator with HyperLight Load™ mode, Power Good
output indicator, and programmable soft-start. HyperLight
Load provides very high efficiency at light loads and ultra-
fast transient response, which makes the MIC23303
perfectly suited for supplying processor core voltages. An
additional benefit of this proprietary architecture is very low
output ripple voltage throughout the entire load range with
the use of small output capacitors. The tiny 3mm × 3mm
DFN package saves precious board space and requires
only six external components.
The MIC23303 is designed for use with a very small
inductor, down to 0.33µH, and an output capacitor as small
as 10µF that enables a total solution size less than 1mm in
height.
The MIC23303 has very low quiescent current of 24µA and
can achieve peak efficiency of 93% in continuous
conduction mode. In discontinuous conduction mode, the
MIC23303 can achieve 80% efficiency at 1mA.
The MIC23303 is available in a 12-pin 3mm × 3mm DFN
package 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
• Output voltage: down to 0.65
• Up to 3A output current
• Up to 93% peak efficiency
• 80% typical efficiency at 1mA
• Power Good output
• Programmable soft-start
• 24µA typical quiescent current
• 4MHz PWM operation in continuous mode
• Ultra-fast transient response
• Low ripple output voltage
− 35mVpp ripple in HyperLight Load mode
− 5mV output voltage ripple in full PWM mode
• Fully-integrated MOSFET switches
• 0.01µA shutdown current
• Thermal-shutdown and current-limit protection
• 12-pin 3mm × 3mm DFN
• –40°C to +125°C junction temperature range
Applications
• Portable media/MP3 players
• Portable navigation devices (GPS)
• WiFi/WiMax/WiBro modules
• Digital Cameras
• Wireless LAN cards
• Portable applications
Typical Application
HyperLight Load 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
September 6, 2013
090613-2.0