MIC23155 Datasheet, PDF (1/19 Pages) Micrel Semiconductor – 3MHz PWM 2A Buck Regulator with HyperLight Load and Power Good

MIC23155
3MHz PWM 2A Buck Regulator with
HyperLight Load^® and Power Good
General Description
The MIC23155 is a high efficiency 3MHz 2A 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 MIC23155
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 2.5mm x
2.5mm Thin MLF^® package saves precious board space
and requires only four external components.
The MIC23155 is designed for use with a very small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2 µF that enables a total solution size, less than 1mm
in height.
The MIC23155 has a very low quiescent current of 22µA
and achieves a peak efficiency of 94% in continuous
conduction mode. In discontinuous conduction mode, the
MIC23155 can achieve 85% efficiency at 1mA.
The MIC23155 is available in a 10-pin 2.5mm x 2.5mm
Thin MLF^® package with an operating junction temperature
range from –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage: 2.7V to 5.5V
• Output voltage: fixed or adjustable (down to 0.7V)
• Up to 2A output current
• Up to 94% peak efficiency
• 85% typical efficiency at 1mA
• Power Good output
• Programmable Soft Start
• 22µA typical quiescent current
• 3MHz PWM operation in continuous conduction mode
• Ultra fast transient response
• Active output discharge when disabled
• Low output voltage ripple
• Fully integrated MOSFET switches
• 0.01µA shutdown current
• Thermal shutdown and current limit protection
• 10-pin 2.5mm x 2.5mm Thin MLF^®
• –40°C to +125°C junction temperature range
Applications
• Solid State Drives (SSD)
• Smart phones
• Tablet PCs
• Mobile handsets
• Portable devices (PMP, PND, UMPC)
• WiFi/WiMax/WiBro applications
____________________________________________________________________________________________________________
Typical Application
Fixed Output Voltage
Adjustable Output Voltage
HyperLight Load is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
April 2011
M9999-041811-A