MIC38300_10 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – HELDO 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 a
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.
Features
HELDO™
• 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
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.
Applications
• Point-of-load applications
• Networking, server, industrial power
The MIC38300 is offered in the small 28-pin 4×6×0.9mm
MLF^® package and can operate from –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com
• Wireless base-stations
• Sensitive RF applications
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Typical Application
HELDO is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademark of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
June 2010
M9999-061010-D