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MIC38300

HELDO® 3A High-Efficiency Low Dropout Regulator

Micrel 

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 +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

April 10, 2013

Revision 5.0

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