MIC22600_09 Datasheet, PDF (1/29 Pages) Micrel Semiconductor – 1MHz, 6A Integrated Switch Synchronous Buck Regulator

MIC22600
1MHz, 6A Integrated Switch
Synchronous Buck Regulator
General Description
The Micrel MIC22600 is a high efficiency 6A Integrated
switch synchronous buck (step-down) regulator. The
MIC22600 is optimized for highest efficiency and achieves
more than 90% efficiency, while still switching at 1MHz
over a broad load range with only 1µH inductor and down
to 47µF output capacitor. The ultra-high speed control loop
keeps the output voltage within regulation even under
extreme transient load swings commonly found in FPGAs
and low voltage ASICs. The output voltage can be
adjusted down to 0.7V to address all low voltage power
needs. The MIC22600 offers a full range of sequencing
and tracking options. The EN/DLY pin combined with the
Power Good/POR pin allows multiple outputs to be
sequenced in any way during turn-on and turn-off. The RC
(Ramp Control™) pin allows the device to be connected to
another product in the MIC22xxx and/or MIC68xxx family,
to keep the output voltages within a certain ∆V on start up.
The MIC22600 is available in a 24-pin 4mm x 4mm MLF^®
and thermally enhanced 24-pin E-Pad TSSOP 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
• Input voltage range: 2.6V to 5.5V
• Output voltage adjustable down to 0.7V
• Output current up to 6A
• Full sequencing and tracking ability
• Power on Reset/Power Good
• Efficiency > 90% across a broad load range
• Ultra fast transient response, easy RC compensation
• 100% maximum duty cycle
• Fully integrated MOSFET switches
• Micropower shutdown
• Thermal shutdown and current limit protection
• 24-pin 4mm x 4mm MLF^®
• 24-pin E-Pad TSSOP
• –40°C to +125°C junction temperature range
Applications
• High power density point of load conversion
• Servers and routers
• DVD recorders
• Computing peripherals
• Base stations
• FPGAs, DSP and low voltage ASIC power
Typical Application
MIC22600 6A 1MHz Synchronous Output Converter
Efficiency V_O - 3.3V
100
95
90
85
80
75
70
65
60
55
500
V_IN - 5V
1234567
OUTPUT CURRENT (A)
Sequencing & Tracking
Ramp Control is a trademark of Micrel, Inc.
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
October 2009
M9999-102809-C