MIC2225_08 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – 2MHz 600mA Synchronous Buck Regulator with 300mA LDO

MIC2225
2MHz 600mA Synchronous Buck
Regulator with 300mA LDO
General Description
The Micrel MIC2225 is a dual output regulator featuring a
high efficiency 2MHz PWM synchronous buck (step-down)
regulator and a 300mA LDO. The MIC2225 is an ultra-low
noise, small size, and high efficiency solution for portable
power applications, providing core and I/O supply rails for
applications like application processors, camera DSPs and
multimedia chipsets.
In PWM mode, the MIC2225 operates with a constant
2MHz frequency. The MIC2225 switching regulator
operates from 2.7V to 5.5V input and features internal
power MOSFETs that can supply up to 600mA output
current in PWM mode.
The MIC2225 is available in the 10-pin 2mm x 2mm Thin
MLF^® package with a junction operating range from –40°C
to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
DC-DC Converter
• 2.7 to 5.5V supply voltage
• 2MHz PWM mode
• Output current to 600mA
• >95% efficiency
• 100% maximum duty cycle
• Fixed output voltage option down to 1V
• Ultra-fast transient response
• Stable with 2.2µF ceramic output capacitor
• Fully integrated MOSFET switches
• Micropower shutdown (1mA in shutdown)
• Thermal shutdown and current limit protection
• Pb-free 10-pin 2mm x 2mm Thin MLF^® package
• –40°C to +125°C junction temperature range
LDO
• V_IN range 2.7V to 5.5V
• 300mA output current
• Output voltage down to 0.8V
• Thermal shutdown protection
• Current limit protection
Applications
• Cellular phones
• PDAs
• USB peripherals
___________________________________________________________________________________________________________
Typical Application
1.8V Efficiency @ 25°C
100
90
80
70
60
50
40
30
20
10
00
2.7V_IN
5.5V_IN
3.6V_IN
0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2008
M9999-022008-D