MIC38300_13 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – 3A High-Efficiency Low Dropout Regulator

MIC38300
HELDO^®
3A High-Efficiency Low Dropout Regulator
General Description
The MIC38300 is a 3A peak, 2.2A continuous output
current step down converter. This is the first device in a
new generation of HELDO^® (High-Efficiency Low Dropout)
regulators that provide the benefits of an LDO in respect to
ease of use, fast transient performance, high PSRR, and
low noise while offering the efficiency of a switching
regulator.
As output voltages move lower, the output noise and
transient response of a switching regulator become an
increasing challenge for designers. By combining a
switcher whose output is slaved to the input of a high-
performance LDO, high efficiency is achieved with a clean
low noise output. The MIC38300 is designed to provide
less than 5mV of peak to peak noise and over 70dB of
PSRR at 1kHz. Furthermore, the architecture of the
MIC38300 is optimized for fast load transients that allow
maintenance of less than 30mV of output voltage deviation
even during ultra-fast load steps, making the MIC38300 an
ideal choice for low-voltage ASICs and other digital ICs.
The MIC38300 features a fully-integrated switching
regulator and LDO combo, operates with input voltages
from 3.0V to 5.5V input, and offers adjustable output
voltages down to 1.0V.
The MIC38300 is offered in the small 28-pin 4mm × 6mm
× 0.9mm MLF^® package and can operate from –40°C to
+125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
HELDO^®
Features
• 3A peak output current
• 2.2A continuous operating current
• Input voltage range: 3.0V to 5.5V
• Adjustable output voltage down to 1.0V
• Output noise less than 5mV
• Ultra-fast transient performance
• Unique switcher plus LDO architecture
• Fully-integrated MOSFET switches
• Micro-power shutdown
• Easy upgrade from LDO as power dissipation becomes
an issue
• Thermal shutdown and current-limit protection
• 4mm × 6mm × 0.9mm MLF package
Applications
• Point-of-load applications
• Networking, server, industrial power
• Wireless base-stations
• Sensitive RF applications
Typical Application
HELDO is a registered trademark of Micrel, Inc.
MLF and MicroLead Frame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
April 10, 2013
Revision 5.0