MIC38300 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 3A SuperLNR™ Low Noise High Efficiency Regulator

MIC38300
3A SuperLNR™
Low Noise High Efficiency Regulator
ADVANCED INFORMATION
General Description
Features
The MIC38300 is a 3A peak, 2.2A continuous output
current step down converter and the first device in a new
generation of SuperLNR™ providing the benefits of LDOs
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 allowing to
maintain 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 4×6×0.9mm
MLF^® package and can operate from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com
• 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
MIC38300 PSRR
90
80
70
60
50
40
30
20
10
010
100
1k
10k 100k
FREQUENCY (Hz)
SuperLNR is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademark of Amkor Technologies
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
July 2007
M9999-070607
[phone]