MIC33153 Datasheet, PDF (1/17 Pages) Micrel Semiconductor – 4MHz PWM 1.2A Internal Inductor Buck Regulator with HyperLight Load and Power Good

MIC33153
4MHz PWM 1.2A Internal Inductor
Buck Regulator with HyperLight Load™
and Power Good
General Description
Features
The MIC33153 is a high-efficiency 4MHz 1.2A
synchronous buck regulator with an internal inductor,
HyperLight Load™ mode, Power Good (PG) output
indicator, and programmable soft start. HyperLight Load™
provides very high efficiency at light loads and ultra-fast
transient response which makes the MIC33153 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 MIC33153 is designed so that only two external
capacitors as small as 2.2µF are needed for stability. This
gives the MIC33153 the ease of use of an LDO with the
efficiency of a HyperLight Load™ DC converter. The
MIC33153 achieves efficiency in HyperLight Load^TM mode
as high as 85% at 1mA, with a very low quiescent current
of 22µA. At higher loads, the MIC33153 provides a
constant switching frequency up to 4MHz.
The MIC33153 is available in 14-pin 3.0mm x 3.5mm
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.
• Internal inductor
− Simplifies design to two external capacitors
• Input voltage: 2.7V to 5.5V
• Output voltage: fixed or adjustable (0.62V to 3.6V)
• Up to 1.2 A output current
• Up to 93% peak efficiency
• 85% typical efficiency at 1mA
• Power Good (PG) output
• Programmable soft start
• 22µA typical quiescent current
• 4MHz PWM operation in continuous mode
• Ultra-fast transient response
• Low ripple output voltage
− 35mVpp ripple in HyperLight Load^™ mode
− 7mV output voltage ripple in full PWM mode
• 0.01µA shutdown current
• Thermal shutdown and current limit protection
• 14-pin 3.0 x 3.5 x 1.1mm MLF^® package
• –40°C to +125°C junction temperature range
Applications
• Solid State Drives (SSD)
• Mobile handsets
• Portable media/MP3 players
• Portable navigation devices (GPS)
• WiFi/WiMax/WiBro modules
• Wireless LAN cards
• Portable applications
____________________________________________________________________________________________________________
Typical Application
Fixed Output Voltage
Adjustable Output Voltage
HyperLight Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademark Amkor Technology Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
September 2010
M9999-092910-A