MIC23163/4

4MHz, 2A, 100% Duty Cycle Buck Regulator

with HyperLight Load

HyperLight Load is a registered trademark of Micrel, 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

June 29, 2013

Revision 2.0

General Description

The

MIC23163/4

is

a

high-efficiency,

4MHz,

2A,

synchronous buck regulator with HyperLight Load

mode and maximum 100% duty cycle. HLL provides very-

high efficiency at light loads and ultra-fast transient

response which makes the MIC23163/4 perfectly suited for

supplying processor core voltages. An additional benefit of

this proprietary architecture is very low output ripple

voltage throughout the entire load range with the use of

small output capacitors. The tiny 2.0mm × 2.0mm DFN

package saves precious board space and requires only

three external components.

The MIC23163/4 is designed for use with a very small

0.47µH inductor and 10µF output capacitor that enables a

total solution size, less than 1mm height.

The MIC23163/4 has a very low quiescent current of 33µA

and achieves as high as 85% efficiency at 1mA. At higher

loads, the MIC23163/4 provides a constant switching

frequency around 4MHz while achieving peak efficiencies

up to 93%. The MIC23164 incorporates an active

discharge feature that switches an 180

Ω FET to ground to

discharge the output when the part is disabled.

The MIC23163/4 is available in 10-pin 2.0mm × 2.0mm

DFN package with an operating junction temperature

range from –40

°C to +125°C.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• Input voltage: 2.7V to 5.5V

• 100% duty cycle

• 2A output current

• Up to 93% peak efficiency

• 85% typical efficiency at 1mA

• Programmable soft-start with pre-bias start-up capability

• Power Good (PG) Indicator

• 4MHz PWM operation in continuous mode

• Ultra-fast transient response

• Low ripple output voltage

• Fully-integrated MOSFET switches

• 0.1µA shutdown current

• Thermal shutdown and current-limit protection

• 10-pin 2.0mm × 2.0mm Thin DFN

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

• Disable pull down 180

Ω (MIC23164 only)

Applications

• Cellular modems

• Mobile handsets

• Portable media/MP3 players

• Portable navigation devices (GPS)

• WiFi/WiMax/WiBro modules

• Digital cameras

• Wireless LAN cards

Typical Application