MIC23303

4MHz PWM 3A Buck Regulator with

HyperLight Load™ and Power Good

HyperLight Load is a 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

September 6, 2013

090613-2.0

General Description

The MIC23303 is a high-efficiency 4MHz 3A synchronous

buck regulator with HyperLight Load™ mode, Power Good

output indicator, and programmable soft-start. HyperLight

Load provides very high efficiency at light loads and ultra-

fast transient response, which makes the MIC23303

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 3mm × 3mm

DFN package saves precious board space and requires

only six external components.

The MIC23303 is designed for use with a very small

inductor, down to 0.33µH, and an output capacitor as small

as 10µF that enables a total solution size less than 1mm in

height.

The MIC23303 has very low quiescent current of 24µA and

can achieve peak efficiency of 93% in continuous

conduction mode. In discontinuous conduction mode, the

MIC23303 can achieve 80% efficiency at 1mA.

The MIC23303 is available in a 12-pin 3mm × 3mm 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

• Output voltage: down to 0.65

• Up to 3A output current

• Up to 93% peak efficiency

• 80% typical efficiency at 1mA

• Power Good output

• Programmable soft-start

• 24µA typical quiescent current

• 4MHz PWM operation in continuous mode

• Ultra-fast transient response

• Low ripple output voltage

− 35mVpp ripple in HyperLight Load mode

− 5mV output voltage ripple in full PWM mode

• Fully-integrated MOSFET switches

• 0.01µA shutdown current

• Thermal-shutdown and current-limit protection

• 12-pin 3mm × 3mm DFN

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

Applications

• Portable media/MP3 players

• Portable navigation devices (GPS)

• WiFi/WiMax/WiBro modules

• Digital Cameras

• Wireless LAN cards

• Portable applications

Typical Application