Microchip MIC23050 Handleiding

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MIC23050

4MHz PWM Buck Regulator with

HyperLight Load™ Switching Scheme

y, Inc.Protected by US Patent No. 7064531

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

HyperLight Load is a trademark of Micrel, Inc.

MLF and MicroLeadFrame are registered trademarks of Amkor Technolog

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • te

September 2011

General Description

The Micrel MIC23050 is a high-efficiency, 600mA, PWM,

synchronous buck (step-down) regulator featuring the

HyperLight Load™ patented switching scheme that offers

best-in-class light load efficiency and transient

performance while providing very-small external

components and low output ripple at all loads.

The MIC23050 also has a very-low typical quiescent

current draw of 20µA and can achieve over 89% efficiency

even at 1mA. The device allows operation with a tiny

inductor ranging from 0.47µH to 2.2µH and uses a small

output capacitor that enables a sub-1mm height.

In contrast to traditional light load schemes, the HyperLight

Load™ architecture does not need to trade off control

speed to obtain low standby currents and in doing so the

device only needs a small output capacitor to absorb the

load transient as the powered device goes from light load

to full load.

At higher loads the MIC23050 provides a constant

switching frequency of greater than 4MHz while providing

peak efficiencies greater than 93%.

The MIC23050 comes in fixed output voltage options from

0.72V to 3.3V eliminating external feedback components.

The MIC23050 is available in an 8-pin 2mm x 2mm MLF®

with a junction operating range from –40° °C to +125C.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

•Input voltage: 2.7V to 5.5V HyperLight Load™

•600mA output current

•Fixed output voltage from 0.72V to 3.3V

•Ultra-fast transient response

•20µA typical quiescent current

•4MHz in PWM in constant-current mode

•0.47µH to 2.2µH inductor

•Low voltage output ripple

−25mVPP in HyperLight Load™ mode

−3mV output voltage ripple in full PWM mode

•>93% efficiency

•~89% at 1mA

•Micropower shutdown

•Available in 8-pin 2mm x 2mm MLF®

• °°–40C to +125C junction temperature range

Applications

•Cellular phones

•Digital cameras

•Portable media players

•Wireless LAN cards

•WiFi/WiMax/WiBro modules

•USB-powered devices

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Typical Application

1 M9999-092211-E

Product specificaties