MIC38150_10 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – HELDO® 1.5A High Efficiency Low Dropout Regulator

MIC38150
HELDO^®
1.5A High Efficiency Low Dropout
Regulator
General Description
The MIC38150 is a 1.5A continuous output current step
down converter. This is a follow on product in the new
HELDO^® (High Efficiency Low DropOut Regulators) family,
that provide the benefits of an LDO with 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 MIC38150 is designed to provide
less than 5mV of peak-to-peak noise and over 70dB of
PSRR at 1kHz. Furthermore, the architecture of the
MIC38150 is optimized for fast load transients allowing the
output to maintain less than 30mV of output voltage
deviation even during ultra fast load steps. This makes the
MIC38150 an ideal choice for low voltage ASICs and other
digital ICs.
The MIC38150 features a fully integrated switching
regulator and LDO combination, operates with input
voltages from 3.0V to 5.5V input and offers adjustable
output voltages down to 1.0V.
The MIC38150 is offered in the small 28-pin 4mm × 6mm
× 0.9mm MLF^® package and can operate from –40°C to
+125°C.
HELDO^®
Features
• Output current up to 1.5A
• 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
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com
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Typical Application
HELDO is a registered 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
June 2010
M9999-061010-C